Tratar JSON no Android Studio

Carlos Rocha · December 14, 2018 at 04:37 PM

Em uma tentativa (sem êxito) de ler uma string em formato JSON fiz assim:

    package carcleo.com.radiosingular;
    
    import android.os.Bundle;
    import android.support.v7.app.AppCompatActivity;
    import android.util.Log;
    
    import org.json.JSONArray;
    import org.json.JSONException;
    import org.json.JSONObject;
    
    import carcleo.com.radiosingular.classes.JsonClass;
    
    public class form extends AppCompatActivity {
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.form);
    
            String url = "http://hotplateprensas.com.br/ws/clientest.php";
            JSONObject clientesLista = null;
            JsonClass json = new JsonClass();
            clientesLista = json.getJSONFromUrl(url);
    
            clientes(clientesLista);
    
        }
    
        public void clientes(JSONObject jsonCli) {
    
            try {
    
                JSONArray arrayPlanetas = jsonCli.getJSONArray("clientes");
    
                for (int i = 0; i < arrayPlanetas.length(); i++) {
    
                    JSONObject cliente = arrayPlanetas.getJSONObject(i);
    
                    Log.d("idClientesT", cliente.getString("idClientesT"));
                    Log.d("tipo", cliente.getString("tipo"));
                    Log.d("nome", cliente.getString("nome"));
    
                }
    
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    
    }

A URL me retorna:

{"clientes":[{"idClientesT":"1","tipo":"s","nome":"Carlos"},{"idClientesT":"2","tipo":"s","nome":"Rogério"}]}

e a classe JsonClass

    package carcleo.com.radiosingular.classes;
    
    import android.util.Log;
    
    import org.json.JSONException;
    import org.json.JSONObject;
    
    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.InputStreamReader;
    import java.io.UnsupportedEncodingException;
    
    import cz.msebera.android.httpclient.HttpEntity;
    import cz.msebera.android.httpclient.HttpResponse;
    import cz.msebera.android.httpclient.client.ClientProtocolException;
    import cz.msebera.android.httpclient.client.methods.HttpPost;
    import cz.msebera.android.httpclient.impl.client.DefaultHttpClient;
    
    public class JsonClass {

        InputStream input = null;
        JSONObject jObect = null;
        String json = "";
    
        //Recebe sua url
        public JSONObject getJSONFromUrl(String url) {
    
            //HTTP request
            try {
                // default HttpClient
                DefaultHttpClient httpClient = new DefaultHttpClient();
                HttpPost httpPost = new HttpPost(url);
    
                HttpResponse httpResponse = httpClient.execute(httpPost);
                HttpEntity httpEntity = httpResponse.getEntity();
                input = httpEntity.getContent();
    
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
    
            try {
                BufferedReader reader = new BufferedReader(new InputStreamReader(
                        input, "iso-8859-1"), 8);
                StringBuilder sb = new StringBuilder();
                String line = null;
                while ((line = reader.readLine()) != null) {
                    sb.append(line + "\n");
                }
                input.close();
                json = sb.toString();
                Log.i("JRF", json);
            } catch (Exception e) {
                Log.e("Buffer Error", "Error converting result " + e.toString());
            }
    
            // Transforma a String de resposta em um JSonObject
            try {
                jObect = new JSONObject(json);
            } catch (JSONException e) {
                Log.e("JSON Parser", "Error parsing data " + e.toString());
            }
    
            // retorna o objeto
            return jObect;
    
        }
    }

Isso me dá o seguinte erro:

    12/14 14:25:05: Launching app
    $ adb install-multiple -r -t -p carcleo.com.radiosingular D:\Trabalhos\AndroidStudio\RadioSingular\app\build\intermediates\split-apk\debug\slices\slice_8.apk 
    Split APKs installed in 1 s 53 ms
    $ adb shell am start -n "carcleo.com.radiosingular/carcleo.com.radiosingular.login" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
    Client not ready yet..Connected to process 13274 on device motorola-moto_g_play-0027377835
    Capturing and displaying logcat messages from application. This behavior can be disabled in the "Logcat output" section of the "Debugger" settings page.
    W/System: ClassLoader referenced unknown path: /data/app/carcleo.com.radiosingular-2/lib/arm
    I/InstantRun: starting instant run server: is main process
    I/Adreno-EGL: <qeglDrvAPI_eglInitialize:379>: EGL 1.4 QUALCOMM build: Nondeterministic_AU_msm8916_32_LA.BR.1.2.9_RB1__release_AU (I750f7f2fa6)
        OpenGL ES Shader Compiler Version: XE031.09.00.03
        Build Date: 02/18/17 Sat
        Local Branch: 
        Remote Branch: quic/LA.BR.1.2.9_rb1.12
        Local Patches: NONE
        Reconstruct Branch: NOTHING
    I/OpenGLRenderer: Initialized EGL, version 1.4
    D/OpenGLRenderer: Swap behavior 1
    W/Adreno-ES20: <get_gpu_clk:229>: open failed: errno 13
    W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
    I/art: Rejecting re-init on previously-failed class java.lang.Class<android.support.v4.view.ViewCompat$OnUnhandledKeyEventListenerWrapper>: java.lang.NoClassDefFoundError: Failed resolution of: Landroid/view/View$OnUnhandledKeyEventListener;
    I/art:     at void android.support.v4.view.ViewCompat.setBackground(android.view.View, android.graphics.drawable.Drawable) (ViewCompat.java:2341)
            at void android.support.v7.widget.ActionBarContainer.<init>(android.content.Context, android.util.AttributeSet) (ActionBarContainer.java:62)
            at java.lang.Object java.lang.reflect.Constructor.newInstance0!(java.lang.Object[]) (Constructor.java:-2)
            at java.lang.Object java.lang.reflect.Constructor.newInstance(java.lang.Object[]) (Constructor.java:430)
            at android.view.View android.view.LayoutInflater.createView(java.lang.String, java.lang.String, android.util.AttributeSet) (LayoutInflater.java:645)
            at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:787)
            at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet) (LayoutInflater.java:727)
            at void android.view.LayoutInflater.rInflate(org.xmlpull.v1.XmlPullParser, android.view.View, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:858)
            at void android.view.LayoutInflater.rInflateChildren(org.xmlpull.v1.XmlPullParser, android.view.View, android.util.AttributeSet, boolean) (LayoutInflater.java:821)
            at android.view.View android.view.LayoutInflater.inflate(org.xmlpull.v1.XmlPullParser, android.view.ViewGroup, boolean) (LayoutInflater.java:518)
            at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup, boolean) (LayoutInflater.java:426)
            at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup) (LayoutInflater.java:377)
            at android.view.ViewGroup android.support.v7.app.AppCompatDelegateImpl.createSubDecor() (AppCompatDelegateImpl.java:607)
            at void android.support.v7.app.AppCompatDelegateImpl.ensureSubDecor() (AppCompatDelegateImpl.java:518)
            at void android.support.v7.app.AppCompatDelegateImpl.setContentView(int) (AppCompatDelegateImpl.java:466)
            at void android.support.v7.app.AppCompatActivity.setContentView(int) (AppCompatActivity.java:140)
            at void carcleo.com.radiosingular.form.onCreate(android.os.Bundle) (form.java:18)
            at void android.app.Activity.performCreate(android.os.Bundle) (Activity.java:6687)
            at void android.app.Instrumentation.callActivityOnCreate(android.app.Activity, android.os.Bundle) (Instrumentation.java:1140)
            at android.app.Activity android.app.ActivityThread.performLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent) (ActivityThread.java:2631)
            at void android.app.ActivityThread.handleLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:2743)
            at void android.app.ActivityThread.-wrap12(android.app.ActivityThread, android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:-1)
            at void android.app.ActivityThread$H.handleMessage(android.os.Message) (ActivityThread.java:1490)
            at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:102)
            at void android.os.Looper.loop() (Looper.java:154)
            at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6165)
            at java.lang.Object java.lang.reflect.Method.invoke!(java.lang.Object, java.lang.Object[]) (Method.java:-2)
            at void com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run() (ZygoteInit.java:888)
            at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:778)
        Caused by: java.lang.ClassNotFoundException: Didn't find class "android.view.View$OnUnhandledKeyEventListener" on path: DexPathList[[zip file "/data/app/carcleo.com.radiosingular-2/base.apk", zip file "/data/app/carcleo.com.radiosingular-2/split_lib_dependencies_apk.apk", zip file "/data/app/carcleo.com.radiosingular-2/split_lib_slice_0_apk.apk", zip file "/data/app/carcleo.com.radiosingular-2/split_lib_slice_1_apk.apk", zip file "/data/app/carcleo.com.radiosingular-2/split_lib_slice_2_apk.apk", zip file "/data/app/carcleo.com.radiosingular-2/split_lib_slice_3_apk.apk", zip file "/data/app/carcleo.com.radiosingular-2/split_lib_slice_4_apk.apk", zip file "/data/app/carcleo.com.radiosingular-2/split_lib_slice_5_apk.apk", zip file "/data/app/carcleo.com.radiosingular-2/split_lib_slice_6_apk.apk", zip file "/data/app/carcleo.com.radiosingular-2/split_lib_slice_7_apk.apk", zip file "/data/app/carcleo.com.radiosingular-2/split_lib_slice_8_apk.apk", zip file "/data/app/carcleo.com.radiosingular-2/split_lib_slice_9_
            at java.lang.Class dalvik.system.BaseDexClassLoader.findClass(java.lang.String) (BaseDexClassLoader.java:56)
            at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String, boolean) (ClassLoader.java:380)
            at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String) (ClassLoader.java:312)
            at void android.support.v4.view.ViewCompat.setBackground(android.view.View, android.graphics.drawable.Drawable) (ViewCompat.java:2341)
            at void android.support.v7.widget.ActionBarContainer.<init>(android.content.Context, android.util.AttributeSet) (ActionBarContainer.java:62)
            at java.lang.Object java.lang.reflect.Constructor.newInstance0!(java.lang.Object[]) (Constructor.java:-2)
            at java.lang.Object java.lang.reflect.Constructor.newInstance(java.lang.Object[]) (Constructor.java:430)
            at android.view.View android.view.LayoutInflater.createView(java.lang.String, java.lang.String, android.util.AttributeSet) (LayoutInflater.java:645)
            at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:787)
            at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet) (LayoutInflater.java:727)
            at void android.view.LayoutInflater.rInflate(org.xmlpull.v1.XmlPullParser, android.view.View, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:858)
            at void android.view.LayoutInflater.rInflateChildren(org.xmlpull.v1.XmlPullParser, android.view.View, android.util.AttributeSet, boolean) (LayoutInflater.java:821)
            at android.view.View android.view.LayoutInflater.inflate(org.xmlpull.v1.XmlPullParser, android.view.ViewGroup, boolean) (LayoutInflater.java:518)
            at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup, boolean) (LayoutInflater.java:426)
            at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup) (LayoutInflater.java:377)
            at android.view.ViewGroup android.support.v7.app.AppCompatDelegateImpl.createSubDecor() (AppCompatDelegateImpl.java:607)
            at void android.support.v7.app.AppCompatDelegateImpl.ensureSubDecor() (AppCompatDelegateImpl.java:518)
            at void android.support.v7.app.AppCompatDelegateImpl.setContentView(int) (AppCompatDelegateImpl.java:466)
            at void android.support.v7.app.AppCompatActivity.setContentView(int) (AppCompatActivity.java:140)
            at void carcleo.com.radiosingular.form.onCreate(android.os.Bundle) (form.java:18)
            at void android.app.Activity.performCreate(android.os.Bundle) (Activity.java:6687)
            at void android.app.Instrumentation.callActivityOnCreate(android.app.Activity, android.os.Bundle) (Instrumentation.java:1140)
            at android.app.Activity android.app.ActivityThread.performLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent) (ActivityThread.java:2631)
            at void android.app.ActivityThread.handleLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:2743)
            at void android.app.ActivityThread.-wrap12(android.app.ActivityThread, android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:-1)
            at void android.app.ActivityThread$H.handleMessage(android.os.Message) (ActivityThread.java:1490)
            at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:102)
            at void android.os.Looper.loop() (Looper.java:154)
            at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6165)
            at java.lang.Object java.lang.reflect.Method.invoke!(java.lang.Object, java.lang.Object[]) (Method.java:-2)
            at void com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run() (ZygoteInit.java:888)
            at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:778)
    D/NetworkSecurityConfig: No Network Security Config specified, using platform default
    D/AndroidRuntime: Shutting down VM
    E/AndroidRuntime: FATAL EXCEPTION: main
        Process: carcleo.com.radiosingular, PID: 13274
        java.lang.RuntimeException: Unable to start activity ComponentInfo{carcleo.com.radiosingular/carcleo.com.radiosingular.form}: android.os.NetworkOnMainThreadException
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2678)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2743)
            at android.app.ActivityThread.-wrap12(ActivityThread.java)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1490)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:154)
            at android.app.ActivityThread.main(ActivityThread.java:6165)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:778)
         Caused by: android.os.NetworkOnMainThreadException
            at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1317)
            at java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:86)
            at java.net.Inet6AddressImpl.lookupAllHostAddr(Inet6AddressImpl.java:74)
            at java.net.InetAddress.getAllByName(InetAddress.java:752)
            at cz.msebera.android.httpclient.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:44)
            at cz.msebera.android.httpclient.impl.conn.DefaultClientConnectionOperator.resolveHostname(DefaultClientConnectionOperator.java:259)
            at cz.msebera.android.httpclient.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:159)
            at cz.msebera.android.httpclient.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:304)
            at cz.msebera.android.httpclient.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:611)
            at cz.msebera.android.httpclient.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:446)
            at cz.msebera.android.httpclient.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:860)
            at cz.msebera.android.httpclient.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
            at cz.msebera.android.httpclient.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:106)
            at carcleo.com.radiosingular.classes.JsonClass.getJSONFromUrl(JsonClass.java:35)
            at carcleo.com.radiosingular.form.onCreate(form.java:23)
            at android.app.Activity.performCreate(Activity.java:6687)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1140)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2631)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2743) 
            at android.app.ActivityThread.-wrap12(ActivityThread.java) 
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1490) 
            at android.os.Handler.dispatchMessage(Handler.java:102) 
            at android.os.Looper.loop(Looper.java:154) 
            at android.app.ActivityThread.main(ActivityThread.java:6165) 
            at java.lang.reflect.Method.invoke(Native Method) 
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:778)

Carlos Rocha · December 15, 2018 at 12:26 PM

Descobri que adicionando o código abaixo ao oncreate, o sistema funciona corretamente.

if (android.os.Build.VERSION.SDK_INT > 9){
    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
    StrictMode.setThreadPolicy(policy);
}

Mas não entendi muito bem.

Pelo código, a impressão que tenho é a de que só funcionará para Dispositivos com versões do Android acima de 9.0?

Está certo isso?

E para versões anteriores? O que fazer?

Obs: Se eu não colocar esse bloco de código dá o seguinte erro:

D/NetworkSecurityConfig: No Network Security Config specified, using platform default

Edited December 15, 2018 at 01:04 PM by carcleo

iron · December 17, 2018 at 09:41 AM

Bem, antes de mais, pedidos http na main thread do android não são recomendados. Como o pedido pode ser demorado, a plataforma, pode "matar" a aplicação.

Em vez disso, recomendo usares o retrofit (existem outras)
http://www.vogella.com/tutorials/Retrofit/article.html

Essa biblioteca já se preocupa em realizar os pedidos asincronos, poupando bastante trabalho nesse ponto.

Quanto à tua dúvida, esse if só irá correr se a versão do sdk for superior à versão 9.
Mas ao usares o retrofit, já não deves ter problemas.

Carlos Rocha · December 17, 2018 at 02:29 PM

Então, o que eu fiz?

Seguindo o teu concelho, para testes, criei:

Uma Activity que chamei de retrofit e um BUTTON nela

package carcleo.com.radiosingular;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import carcleo.com.radiosingular.classes.Clientes;
import carcleo.com.radiosingular.classes.ClientesI;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;

public class retrofit extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.retrofit);
        Button btnRf = (Button) findViewById(R.id.btnRf);
        btnRf.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                ClientesI clientes = ClientesI.retrofit.create(ClientesI.class);
                final Call<Clientes> call = clientes.getIdClientesT("");
                call.enqueue(new Callback<Clientes>() {
                    @Override
                    public void onResponse(Call<Clientes> call, Response<Clientes> response) {
                        int code = response.code();
                        if (code == 200) {
                            Clientes cliente = response.body();
                            Toast.makeText(getBaseContext(), "Id do cliente: " + cliente.getIdClientesT(), Toast.LENGTH_LONG).show();
                            Toast.makeText(getBaseContext(), "Tipo do cliente: " + cliente.getTipo(), Toast.LENGTH_LONG).show();
                            Toast.makeText(getBaseContext(), "Nome do cliente: " + cliente.getNome(), Toast.LENGTH_LONG).show();
                        } else {
                            Toast.makeText(getBaseContext(), "Falha: " + String.valueOf(code), Toast.LENGTH_LONG).show();
                        }
                    }

                    @Override
                    public void onFailure(Call<Clientes> call, Throwable t) {
                        Toast.makeText(getBaseContext(), t.getMessage(), Toast.LENGTH_LONG).show();
                    }

                });
            }
        }
        );
    }

}

Uma Interface ClientesI

package carcleo.com.radiosingular.classes;

import retrofit2.Call;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
import retrofit2.http.GET;
import retrofit2.http.Path;

public interface ClientesI {
    @GET()

    Call<Clientes> getIdClientesT(@Path("") String cliente);
    // Essa url já entrega uma string em formato JSON, a mesma do incio do post
    public static final Retrofit retrofit = new Retrofit.Builder()
            .baseUrl("http://hotplateprensas.com.br/ws/clientest.php/")
            .addConverterFactory(GsonConverterFactory.create())
            .build();

}

Acontece que quando chega na linha

final Call<Clientes> call = clientes.getIdClientesT("");

está dando erro no console.


E/AndroidRuntime: FATAL EXCEPTION: main
    Process: carcleo.com.radiosingular, PID: 20298
    java.lang.IllegalArgumentException: @Path can only be used with relative url on @GET (parameter #1)
        for method ClientesI.getIdClientesT
        at retrofit2.ServiceMethod$Builder.methodError(ServiceMethod.java:720)
        at retrofit2.ServiceMethod$Builder.methodError(ServiceMethod.java:711)
        at retrofit2.ServiceMethod$Builder.parameterError(ServiceMethod.java:729)
        at retrofit2.ServiceMethod$Builder.parseParameterAnnotation(ServiceMethod.java:390)
        at retrofit2.ServiceMethod$Builder.parseParameter(ServiceMethod.java:333)
        at retrofit2.ServiceMethod$Builder.build(ServiceMethod.java:202)
        at retrofit2.Retrofit.loadServiceMethod(Retrofit.java:166)
        at retrofit2.Retrofit$1.invoke(Retrofit.java:145)
        at java.lang.reflect.Proxy.invoke(Proxy.java:813)
        at $Proxy0.getIdClientesT(Unknown Source)
        at carcleo.com.radiosingular.retrofit$1.onClick(retrofit.java:27)
        at android.view.View.performClick(View.java:5640)
        at android.view.View$PerformClick.run(View.java:22455)
        at android.os.Handler.handleCallback(Handler.java:751)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6165)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:778)

no método OnResponse, é feita uma referência Call<Clientes>

 public void onResponse(Call<Clientes> call, Response<Clientes> response) {

E parece que é feita uma busca e nada é retornado. Pois busca por um parâmetro na url que não existe.

Onde estou errando?

Edited December 17, 2018 at 04:18 PM by carcleo

iron · December 17, 2018 at 07:31 PM

Experimenta isto,

Aqui vais alterar para isto :

public interface ClientesI {
  

    @GET("clientest.php")
    Call<Clientes> getIdClientesT();
    // Essa url já entrega uma string em formato JSON, a mesma do incio do post
    public static final Retrofit retrofit = new Retrofit.Builder()
            .baseUrl("http://hotplateprensas.com.br/ws/")
            .addConverterFactory(GsonConverterFactory.create())
            .build();

}

package carcleo.com.radiosingular;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import carcleo.com.radiosingular.classes.Clientes;
import carcleo.com.radiosingular.classes.ClientesI;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;

public class retrofit extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.retrofit);
        Button btnRf = (Button) findViewById(R.id.btnRf);
        btnRf.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                ClientesI clientes = ClientesI.retrofit.create(ClientesI.class);
                final Call<Clientes> call = clientes.getIdClientesT();
                call.enqueue(new Callback<Clientes>() {
                    @Override
                    public void onResponse(Call<Clientes> call, Response<Clientes> response) {
                        int code = response.code();
                        if (code == 200) {
                            Clientes cliente = response.body();
                            Toast.makeText(getBaseContext(), "Id do cliente: " + cliente.getIdClientesT(), Toast.LENGTH_LONG).show();
                            Toast.makeText(getBaseContext(), "Tipo do cliente: " + cliente.getTipo(), Toast.LENGTH_LONG).show();
                            Toast.makeText(getBaseContext(), "Nome do cliente: " + cliente.getNome(), Toast.LENGTH_LONG).show();
                        } else {
                            Toast.makeText(getBaseContext(), "Falha: " + String.valueOf(code), Toast.LENGTH_LONG).show();
                        }
                    }

                    @Override
                    public void onFailure(Call<Clientes> call, Throwable t) {
                        Toast.makeText(getBaseContext(), t.getMessage(), Toast.LENGTH_LONG).show();
                    }

                });
            }
        }
        );
    }

}

Carlos Rocha · December 17, 2018 at 08:27 PM

Também não funcionou. Mas seguindo o raciocínio cheguei em:

package carcleo.com.radiosingular.classes;

import retrofit2.Call;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
import retrofit2.http.GET;
import retrofit2.http.Path;

public interface ClientesI {

    @GET("{url}")

    Call<Clientes> getIdClientesT(@Path("url") String url);

    static final String url = "clientest.php";

    public static final Retrofit retrofit = new Retrofit.Builder()
            .baseUrl("http://hotplateprensas.com.br/ws/")
            .addConverterFactory(GsonConverterFactory.create())
            .build();

}

e,

package carcleo.com.radiosingular;

import android.os.Build;
import android.support.annotation.RequiresApi;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import java.util.List;

import carcleo.com.radiosingular.classes.Clientes;
import carcleo.com.radiosingular.classes.ClientesI;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

public class retrofit extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.retrofit);
        Button btnRf = (Button) findViewById(R.id.btnRf);
        btnRf.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
             ClientesI clientes = ClientesI.retrofit.create(ClientesI.class);
             final Call<List<Clientes>> call = clientes.getIdClientesT(clientes.url);
             call.enqueue(new Callback<List<Clientes>>() {
                 @RequiresApi(api = Build.VERSION_CODES.N)
                 @Override
                 public void onResponse(Call<List<Clientes>> call, Response<List<Clientes>> response) {
                     int code = response.code();
                     if (code == 200) {
                         List<Clientes> cliente = response.body();
                         for (Clientes cli : cliente) {
                             Toast.makeText(getBaseContext(), "Id do cliente: " + cli.getIdClientesT(), Toast.LENGTH_LONG).show();
                             Toast.makeText(getBaseContext(), "Tipo do cliente: " + cli.getTipo(), Toast.LENGTH_LONG).show();
                             Toast.makeText(getBaseContext(), "Nome do cliente: " + cli.getNome(), Toast.LENGTH_LONG).show();
                         }
                     } else {
                         Toast.makeText(getBaseContext(), "Falha: " + String.valueOf(code), Toast.LENGTH_LONG).show();
                     }
                 }
                 @Override
                 public void onFailure(Call<List<Clientes>> call, Throwable t) {
                     Toast.makeText(getBaseContext(), t.getMessage(), Toast.LENGTH_LONG).show();
                 }

             });
            }
            }
        );
    }

}

Desta forma entra no bloco do

if (code == 200) {

Mas aí estou com outro problema;

Meu json que chega do site é no formato:

{"clientes":[{"idClientesT":"1","tipo":"s","nome":"Carlos"},{"idClientesT":"2","tipo":"s","nome":"Rogério"}]}

E tem mais de 1 retorno.

Porém não estou conseguindo tratar o onResponse para mais que 1 retorno.

Pode me ajudar?

Em tempo:

A mensagem de erro do console é:

12/17 20:37:47: Launching app
$ adb install-multiple -r -t D:\Trabalhos\AndroidStudio\RadioSingular\app\build\intermediates\split-apk\debug\slices\slice_6.apk D:\Trabalhos\AndroidStudio\RadioSingular\app\build\intermediates\split-apk\debug\slices\slice_1.apk D:\Trabalhos\AndroidStudio\RadioSingular\app\build\intermediates\split-apk\debug\dep\dependencies.apk D:\Trabalhos\AndroidStudio\RadioSingular\app\build\intermediates\split-apk\debug\slices\slice_5.apk D:\Trabalhos\AndroidStudio\RadioSingular\app\build\intermediates\split-apk\debug\slices\slice_7.apk D:\Trabalhos\AndroidStudio\RadioSingular\app\build\intermediates\split-apk\debug\slices\slice_8.apk D:\Trabalhos\AndroidStudio\RadioSingular\app\build\intermediates\split-apk\debug\slices\slice_9.apk D:\Trabalhos\AndroidStudio\RadioSingular\app\build\intermediates\split-apk\debug\slices\slice_4.apk D:\Trabalhos\AndroidStudio\RadioSingular\app\build\intermediates\split-apk\debug\slices\slice_3.apk D:\Trabalhos\AndroidStudio\RadioSingular\app\build\intermediates\split-apk\debug\slices\slice_2.apk D:\Trabalhos\AndroidStudio\RadioSingular\app\build\intermediates\split-apk\debug\slices\slice_0.apk D:\Trabalhos\AndroidStudio\RadioSingular\app\build\intermediates\instant-run-apk\debug\app-debug.apk 
Split APKs installed in 2 s 642 ms
$ adb shell am start -n "carcleo.com.radiosingular/carcleo.com.radiosingular.login" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Client not ready yet..Waiting for process to come online
Connected to process 25557 on device motorola-moto_g_play-0027377835
Capturing and displaying logcat messages from application. This behavior can be disabled in the "Logcat output" section of the "Debugger" settings page.
I/art: Late-enabling -Xcheck:jni
W/System: ClassLoader referenced unknown path: /data/app/carcleo.com.radiosingular-2/lib/arm
I/InstantRun: starting instant run server: is main process
I/Adreno-EGL: <qeglDrvAPI_eglInitialize:379>: EGL 1.4 QUALCOMM build: Nondeterministic_AU_msm8916_32_LA.BR.1.2.9_RB1__release_AU (I750f7f2fa6)
    OpenGL ES Shader Compiler Version: XE031.09.00.03
    Build Date: 02/18/17 Sat
    Local Branch: 
    Remote Branch: quic/LA.BR.1.2.9_rb1.12
    Local Patches: NONE
    Reconstruct Branch: NOTHING
I/OpenGLRenderer: Initialized EGL, version 1.4
D/OpenGLRenderer: Swap behavior 1
W/Adreno-ES20: <get_gpu_clk:229>: open failed: errno 13
W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
I/art: Rejecting re-init on previously-failed class java.lang.Class<android.support.v4.view.ViewCompat$OnUnhandledKeyEventListenerWrapper>: java.lang.NoClassDefFoundError: Failed resolution of: Landroid/view/View$OnUnhandledKeyEventListener;
        at void android.support.v4.view.ViewCompat.setBackground(android.view.View, android.graphics.drawable.Drawable) (ViewCompat.java:2341)
        at void android.support.v7.widget.ActionBarContainer.<init>(android.content.Context, android.util.AttributeSet) (ActionBarContainer.java:62)
        at java.lang.Object java.lang.reflect.Constructor.newInstance0!(java.lang.Object[]) (Constructor.java:-2)
        at java.lang.Object java.lang.reflect.Constructor.newInstance(java.lang.Object[]) (Constructor.java:430)
        at android.view.View android.view.LayoutInflater.createView(java.lang.String, java.lang.String, android.util.AttributeSet) (LayoutInflater.java:645)
        at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:787)
        at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet) (LayoutInflater.java:727)
        at void android.view.LayoutInflater.rInflate(org.xmlpull.v1.XmlPullParser, android.view.View, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:858)
        at void android.view.LayoutInflater.rInflateChildren(org.xmlpull.v1.XmlPullParser, android.view.View, android.util.AttributeSet, boolean) (LayoutInflater.java:821)
        at android.view.View android.view.LayoutInflater.inflate(org.xmlpull.v1.XmlPullParser, android.view.ViewGroup, boolean) (LayoutInflater.java:518)
        at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup, boolean) (LayoutInflater.java:426)
        at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup) (LayoutInflater.java:377)
        at android.view.ViewGroup android.support.v7.app.AppCompatDelegateImpl.createSubDecor() (AppCompatDelegateImpl.java:607)
        at void android.support.v7.app.AppCompatDelegateImpl.ensureSubDecor() (AppCompatDelegateImpl.java:518)
        at void android.support.v7.app.AppCompatDelegateImpl.setContentView(int) (AppCompatDelegateImpl.java:466)
        at void android.support.v7.app.AppCompatActivity.setContentView(int) (AppCompatActivity.java:140)
        at void carcleo.com.radiosingular.retrofit.onCreate(android.os.Bundle) (retrofit.java:24)
        at void android.app.Activity.performCreate(android.os.Bundle) (Activity.java:6687)
        at void android.app.Instrumentation.callActivityOnCreate(android.app.Activity, android.os.Bundle) (Instrumentation.java:1140)
        at android.app.Activity android.app.ActivityThread.performLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent) (ActivityThread.java:2631)
        at void android.app.ActivityThread.handleLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:2743)
        at void android.app.ActivityThread.-wrap12(android.app.ActivityThread, android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:-1)
        at void android.app.ActivityThread$H.handleMessage(android.os.Message) (ActivityThread.java:1490)
        at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:102)
        at void android.os.Looper.loop() (Looper.java:154)
        at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6165)
        at java.lang.Object java.lang.reflect.Method.invoke!(java.lang.Object, java.lang.Object[]) (Method.java:-2)
        at void com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run() (ZygoteInit.java:888)
        at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:778)
    Caused by: java.lang.ClassNotFoundException: Didn't find class "android.view.View$OnUnhandledKeyEventListener" on path: DexPathList[[zip file "/data/app/carcleo.com.radiosingular-2/base.apk", zip file "/data/app/carcleo.com.radiosingular-2/split_lib_dependencies_apk.apk", zip file "/data/app/carcleo.com.radiosingular-2/split_lib_slice_0_apk.apk", zip file "/data/app/carcleo.com.radiosingular-2/split_lib_slice_1_apk.apk", zip file "/data/app/carcleo.com.radiosingular-2/split_lib_slice_2_apk.apk", zip file "/data/app/carcleo.com.radiosingular-2/split_lib_slice_3_apk.apk", zip file "/data/app/carcleo.com.radiosingular-2/split_lib_slice_4_apk.apk", zip file "/data/app/carcleo.com.radiosingular-2/split_lib_slice_5_apk.apk", zip file "/data/app/carcleo.com.radiosingular-2/split_lib_slice_6_apk.apk", zip file "/data/app/carcleo.com.radiosingular-2/split_lib_slice_7_apk.apk", zip file "/data/app/carcleo.com.radiosingular-2/split_lib_slice_8_apk.apk", zip file "/data/app/carcleo.com.radiosingular-2/split_lib_slice_9_
        at java.lang.Class dalvik.system.BaseDexClassLoader.findClass(java.lang.String) (BaseDexClassLoader.java:56)
        at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String, boolean) (ClassLoader.java:380)
        at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String) (ClassLoader.java:312)
        at void android.support.v4.view.ViewCompat.setBackground(android.view.View, android.graphics.drawable.Drawable) (ViewCompat.java:2341)
        at void android.support.v7.widget.ActionBarContainer.<init>(android.content.Context, android.util.AttributeSet) (ActionBarContainer.java:62)
        at java.lang.Object java.lang.reflect.Constructor.newInstance0!(java.lang.Object[]) (Constructor.java:-2)
        at java.lang.Object java.lang.reflect.Constructor.newInstance(java.lang.Object[]) (Constructor.java:430)
        at android.view.View android.view.LayoutInflater.createView(java.lang.String, java.lang.String, android.util.AttributeSet) (LayoutInflater.java:645)
        at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:787)
        at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet) (LayoutInflater.java:727)
        at void android.view.LayoutInflater.rInflate(org.xmlpull.v1.XmlPullParser, android.view.View, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:858)
        at void android.view.LayoutInflater.rInflateChildren(org.xmlpull.v1.XmlPullParser, android.view.View, android.util.AttributeSet, boolean) (LayoutInflater.java:821)
        at android.view.View android.view.LayoutInflater.inflate(org.xmlpull.v1.XmlPullParser, android.view.ViewGroup, boolean) (LayoutInflater.java:518)
        at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup, boolean) (LayoutInflater.java:426)
        at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup) (LayoutInflater.java:377)
        at android.view.ViewGroup android.support.v7.app.AppCompatDelegateImpl.createSubDecor() (AppCompatDelegateImpl.java:607)
        at void android.support.v7.app.AppCompatDelegateImpl.ensureSubDecor() (AppCompatDelegateImpl.java:518)
        at void android.support.v7.app.AppCompatDelegateImpl.setContentView(int) (AppCompatDelegateImpl.java:466)
        at void android.support.v7.app.AppCompatActivity.setContentView(int) (AppCompatActivity.java:140)
        at void carcleo.com.radiosingular.retrofit.onCreate(android.os.Bundle) (retrofit.java:24)
        at void android.app.Activity.performCreate(android.os.Bundle) (Activity.java:6687)
        at void android.app.Instrumentation.callActivityOnCreate(android.app.Activity, android.os.Bundle) (Instrumentation.java:1140)
        at android.app.Activity android.app.ActivityThread.performLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent) (ActivityThread.java:2631)
        at void android.app.ActivityThread.handleLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:2743)
        at void android.app.ActivityThread.-wrap12(android.app.ActivityThread, android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:-1)
        at void android.app.ActivityThread$H.handleMessage(android.os.Message) (ActivityThread.java:1490)
        at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:102)
        at void android.os.Looper.loop() (Looper.java:154)
        at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6165)
        at java.lang.Object java.lang.reflect.Method.invoke!(java.lang.Object, java.lang.Object[]) (Method.java:-2)
        at void com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run() (ZygoteInit.java:888)
        at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:778)
I/ViewConfigCompat: Could not find method getScaledScrollFactor() on ViewConfiguration
W/art: Before Android 4.1, method int android.support.v7.widget.DropDownListView.lookForSelectablePosition(int, boolean) would have incorrectly overridden the package-private method in android.widget.ListView
D/OpenGLRenderer: endAllActiveAnimators on 0xafb5d300 (RippleDrawable) with handle 0x99c7fe50
D/NetworkSecurityConfig: No Network Security Config specified, using platform default

A mensagem de erro que aparece no dispositivo é:

Expected BEGIN_OBJECT but was STRING at line 1 column 1

iron · December 17, 2018 at 11:10 PM

Vamos entender o JSON:

{
   "clientes":[
      {
         "idClientesT":"1",
         "tipo":"s",
         "nome":"Carlos"
      },
      {
         "idClientesT":"2",
         "tipo":"s",
         "nome":"Rogério"
      }
   ]
}

O JSON é um objecto que contém uma propriedade do tipo array de objectos (vamos chamar assim por enquanto) com o nome clientes.
Esse array de "objectos" é um objecto que tem as propriedades:

- idClientesT
- tipo
- nome

Todas estas propriedades são do tipo String.

Sabendo isto, é necessário criar um modelo, que contenha as propriedade que vêm no JSON, para que a biblioteca Gson possa mapear.

Depois de criares isso, se não funcionar, coloca aqui o teu modelo também.

Carlos Rocha · December 18, 2018 at 10:25 AM

Ainda assim não funcionou.

Vamos por partes:

Lá no Webservice, minha classe PHP que gera o JSON:

<?php

  header('Content-Type: application/json');
  ini_set("display_errors",true);
  ini_set("display_startup_erros",1);
  error_reporting(E_ALL && E_NOTICE);
  error_reporting( E_ALL | E_STRICT ); // PHP 5.3
  error_reporting( E_ALL ); // Todas as outras versões 

  require_once "../_controlls/_conexao/Conexao.php";
  
  $conection = new Conexao();
  $conexao = $conection->abreConexao();

  function pesquisaClientesT($conexao) {
        
         $clientes = ""; 
         
         $string = "SELECT 
                      idClientesT,
                      tipo,  
                      nome
                    FROM clientest";
      
         $registros = $conexao->query($string);
                   
         $quantasLinhas = $registros->num_rows;
      
         if ($quantasLinhas > 0) {        
        
             $clientes .= "{\"clientes\":[";                 
             
             while (
                 list ( 
                        $idCliente, 
                        $tipo,  
                        $nome            
                 ) = $registros->fetch_row() ){
                       $cliente = array(
                         "idClientesT"=>$idCliente,
                         "tipo"=>$tipo,
                         "nome"=>$nome
                       );
                 
                       $clientes .= json_encode($cliente, JSON_UNESCAPED_UNICODE).",";
                    }
             
             $clientes = substr($clientes,0, strlen($clientes)-1);
             $clientes .= "]}"; 
         }
                 
          return  $clientes;
         
     }

     $todos = pesquisaClientesT($conexao);
  
     echo $todos;


?>

Gera uma saída assim:

{"clientes":[
  {
    "idClientesT":"1",
    "tipo":"s",
    "nome":"Carlos"
  ]},{
    "idClientesT":"2",
    "tipo":"s",
    "nome":"Rogério"
  }
]}

Classe Clientes no Android (App)

package carcleo.com.radiosingular.classes;

public class Clientes {
    private String idClientesT;
    private String tipo;
    private String nome;

    public Clientes(String idClientesT, String tipo, String nome) {
        this.idClientesT = idClientesT;
        this.tipo = tipo;
        this.nome = nome;
    }

    public String getIdClientesT() {
        return idClientesT;
    }

    public String getTipo() {
        return tipo;
    }

    public String getNome() {
        return nome;
    }
}

A execução está saindo no bloco de falha com o erro abaixo na tela do Android.

Expected BEGIN_OBJECT but was STRING at line 1 column 2 path$

Será possível ser problema na conexão com a internet?

No primeiro post dessa pergunta, la em cima, eu usei jsonArray e deu certo. Enfim, não usei Retrofit.

Mas foi necessário o uso de

if (android.os.Build.VERSION.SDK_INT > 9){
    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
    StrictMode.setThreadPolicy(policy);
}

Não seria esse o caso? Se sim, aonde coloco ele na nova forma usando Retrofit?

Obs..: já tem permissão de internet no AndroidManifest

Sign In

Tratar JSON no Android Studio

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iron

Carlos Rocha

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Cumprimentos, iron

Cumprimentos, iron

Cumprimentos, iron

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Important Information

Cumprimentos,
iron

Cumprimentos,
iron

Cumprimentos,
iron