Une erreur inattendue s'est produite lors du lancement de l'application/activité Android

Je suis confronté à un problème où, lorsque j'essaie de lancer l'application, je rencontre une erreur inattendue. J'essaye de le résoudre, mais mes tentatives ont été infructueuses.Une erreur inattendue s'est produite lors du lancement de l'application/activité Android

Voici le code:

import java.security.MessageDigest; 
import java.security.NoSuchAlgorithmException; 

import android.app.Activity; 
import android.content.Intent; 
import android.content.pm.PackageInfo; 
import android.content.pm.PackageManager; 
import android.content.pm.PackageManager.NameNotFoundException; 
import android.content.pm.Signature; 
import android.os.Bundle; 
import android.util.Base64; 
import android.util.Log; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.animation.AlphaAnimation; 
import android.widget.Button; 
import android.widget.TextView; 
import android.widget.Toast; 

import com.facebook.LoggingBehavior; 
import com.facebook.Session; 
import com.facebook.SessionState; 
import com.facebook.Settings; 


public class LoginActivity extends Activity { 

    private AlphaAnimation alphaDown; 
    private AlphaAnimation alphaUp; 
    private Button fbloginbtn; 
    private Session.StatusCallback statusCallback = new SessionStatusCallback(); 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.home); 

     alphaDown = new AlphaAnimation(1.0f, 0.3f); 
     alphaUp = new AlphaAnimation(0.3f, 1.0f); 
     alphaDown.setDuration(100); 
     alphaUp.setDuration(100); 
     alphaDown.setFillAfter(true); 
     alphaUp.setFillAfter(true); 
     fbloginbtn = (Button)findViewById(R.id.fbloginbtn); 

     Settings.addLoggingBehavior(LoggingBehavior.INCLUDE_ACCESS_TOKENS); 

     // Add Session Callback Here 
     Session.getActiveSession().addCallback(statusCallback); 

     Session session = Session.getActiveSession(); 
     if(session == null) { 
      if(savedInstanceState != null) { 
       session = Session.restoreSession(this, null, statusCallback, savedInstanceState); 
      } 
      if(session== null) { 
       session = new Session(this); 
      } 
      Session.setActiveSession(session); 
      if (session.getState().equals(SessionState.CREATED_TOKEN_LOADED)) { 
       session.openForRead(new Session.OpenRequest(this).setCallback(statusCallback)); 
      } 

      // Get Avtive Session again in case of session is null 
      Session session1 = Session.getActiveSession(); 
     } 
    } 


    @Override 
    public void onStart() { 
     super.onStart(); 
     Session.getActiveSession().addCallback(statusCallback); 
    } 

    @Override 
    public void onStop() { 
     super.onStop(); 
     Session.getActiveSession().removeCallback(statusCallback); 
    } 

    @Override 
    public void onActivityResult(int requestCode, int resultCode, Intent data) { 
     super.onActivityResult(requestCode, resultCode, data); 
     Session.getActiveSession().onActivityResult(this, requestCode, resultCode, data); 
    } 

    @Override 
    protected void onSaveInstanceState(Bundle outState) { 
     super.onSaveInstanceState(outState); 
     Session session = Session.getActiveSession(); 
     Session.saveSession(session, outState); 
    } 

    private void updateView() { 
     final Session session = Session.getActiveSession();  
     fbloginbtn.setOnClickListener(new OnClickListener() { 
      public void onClick(View view) {  
      if(session.isOpened()){ 
       Toast.makeText(getApplicationContext(), "loginfb...", Toast.LENGTH_LONG).show(); 
       fblogin(); 
      } 
      else{ 
       Toast.makeText(getApplicationContext(), "onClickLogin...", Toast.LENGTH_LONG).show(); 
       onClickLogin(); 
      } 
      } 
     }); 
    } 

    public void fblogin() { 
     Intent intent = new Intent(LoginActivity.this, MoodActivity.class); 
     startActivity(intent); 

    } 

    private void onClickLogin() { 
     Session session = Session.getActiveSession(); 
     if (!session.isOpened() && !session.isClosed()) { 
      session.openForRead(new Session.OpenRequest(this).setCallback(statusCallback)); 
     } else { 
      Session.openActiveSession(this, true, statusCallback); 
     } 
     Intent intent = new Intent(LoginActivity.this, MoodActivity.class); 
     startActivity(intent); 
    } 


    private class SessionStatusCallback implements Session.StatusCallback { 
     @Override 
     public void call(Session session, SessionState state, Exception exception) { 
      updateView(); 
     } 
    } 
}

Ci-dessous le message qui est affiché à partir logcat

07-18 15:46:12.406: D/dalvikvm(12236): GC_FOR_ALLOC freed 54K, 6% free 2870K/3032K, paused 4ms, total 4ms 
07-18 15:46:12.426: I/dalvikvm-heap(12236): Grow heap (frag case) to 25.335MB for 23520012-byte allocation 
07-18 15:46:12.434: D/dalvikvm(12236): GC_FOR_ALLOC freed <1K, 1% free 25839K/26004K, paused 7ms, total 7ms 
07-18 15:46:12.570: D/dalvikvm(12236): GC_FOR_ALLOC freed 1K, 1% free 27719K/27880K, paused 2ms, total 3ms 
07-18 15:46:12.586: D/dalvikvm(12236): GC_FOR_ALLOC freed 2K, 1% free 29051K/29212K, paused 3ms, total 3ms 
07-18 15:46:12.598: D/AndroidRuntime(12236): Shutting down VM 
07-18 15:46:12.598: W/dalvikvm(12236): threadid=1: thread exiting with uncaught exception (group=0xa4cf1b20) 
07-18 15:46:12.598: E/AndroidRuntime(12236): FATAL EXCEPTION: main 
07-18 15:46:12.598: E/AndroidRuntime(12236): Process: com.dooba_demo_version, PID: 12236 
07-18 15:46:12.598: E/AndroidRuntime(12236): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.dooba_demo_version/com.dooba_demo_version.LoginActivity}: java.lang.NullPointerException 
07-18 15:46:12.598: E/AndroidRuntime(12236): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195) 
07-18 15:46:12.598: E/AndroidRuntime(12236): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245) 
07-18 15:46:12.598: E/AndroidRuntime(12236): at android.app.ActivityThread.access$800(ActivityThread.java:135) 
07-18 15:46:12.598: E/AndroidRuntime(12236): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
07-18 15:46:12.598: E/AndroidRuntime(12236): at android.os.Handler.dispatchMessage(Handler.java:102) 
07-18 15:46:12.598: E/AndroidRuntime(12236): at android.os.Looper.loop(Looper.java:136) 
07-18 15:46:12.598: E/AndroidRuntime(12236): at android.app.ActivityThread.main(ActivityThread.java:5017) 
07-18 15:46:12.598: E/AndroidRuntime(12236): at java.lang.reflect.Method.invokeNative(Native Method) 
07-18 15:46:12.598: E/AndroidRuntime(12236): at java.lang.reflect.Method.invoke(Method.java:515) 
07-18 15:46:12.598: E/AndroidRuntime(12236): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
07-18 15:46:12.598: E/AndroidRuntime(12236): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
07-18 15:46:12.598: E/AndroidRuntime(12236): at dalvik.system.NativeStart.main(Native Method) 
07-18 15:46:12.598: E/AndroidRuntime(12236): Caused by: java.lang.NullPointerException 
07-18 15:46:12.598: E/AndroidRuntime(12236): at com.dooba_demo_version.LoginActivity.onCreate(LoginActivity.java:51) 
07-18 15:46:12.598: E/AndroidRuntime(12236): at android.app.Activity.performCreate(Activity.java:5231) 
07-18 15:46:12.598: E/AndroidRuntime(12236): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
07-18 15:46:12.598: E/AndroidRuntime(12236): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159) 
07-18 15:46:12.598: E/AndroidRuntime(12236): ... 11 more

Ci-dessous mon android fichier manifeste

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.dooba_demo_version" 
    android:versionCode="1" 
    android:versionName="1.0" > 

    <uses-sdk android:minSdkVersion="11" /> 

    <uses-permission android:name="android.permission.INTERNET" /> 

    <application 
     android:icon="@drawable/d21" 
     android:label="@string/app_name" > 

     <activity 
      android:name="com.dooba_demo_version.LoginActivity" 
      android:screenOrientation="portrait" 
      android:theme="@android:style/Theme.NoTitleBar" > 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
     <activity 
      android:name="com.facebook.LoginActivity" 
      android:label="@string/app_name" 
      android:screenOrientation="portrait" 
      android:theme="@android:style/Theme.Translucent.NoTitleBar" /> 

     <meta-data 
      android:name="com.facebook.sdk.ApplicationId" 
      android:value="@string/app_id" /> 

     <activity 
      android:name="com.dooba_demo_version.MoodActivity" 
      android:theme="@android:style/Theme.NoTitleBar" > 
     </activity> 
    </application> 

</manifest>

mise à jour qui traite NullPointerException

@Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.home); 

     alphaDown = new AlphaAnimation(1.0f, 0.3f); 
     alphaUp = new AlphaAnimation(0.3f, 1.0f); 
     alphaDown.setDuration(100); 
     alphaUp.setDuration(100); 
     alphaDown.setFillAfter(true); 
     alphaUp.setFillAfter(true); 
     fbloginbtn = (Button)findViewById(R.id.fbloginbtn); 

     Settings.addLoggingBehavior(LoggingBehavior.INCLUDE_ACCESS_TOKENS); 

     // Add Session Callback Here 
     Session.getActiveSession().addCallback(statusCallback); 

     Session session = Session.getActiveSession(); 
     if(session == null) { 
      if(savedInstanceState != null) { 
       session = Session.restoreSession(this, null, statusCallback, savedInstanceState); 
      } 
      if(session== null) { 
       session = new Session(this); 

      } 

      Session.setActiveSession(session); 
      if (session.getState().equals(SessionState.CREATED_TOKEN_LOADED)) { 
       session.openForRead(new Session.OpenRequest(this).setCallback(statusCallback)); 
      } 
     // Get Avtive Session again in case of session is null 
      Session session1 = Session.getActiveSession(); 
     } 
     else { 
      Session.getActiveSession().addCallback(statusCallback); 
     } 
    }

Merci à l'avance

Source

2014-07-18 user3827788

Il y a un NullPointerException accumulés par cette déclaration

Session.getActiveSession().addCallback(statusCallback);

pour résoudre ce problème, vous devez vous assurer que la session n'est pas nul avant d'essayer d'invoquer la méthode addCallback, de sorte que vous besoin d'ajouter else à if(session == null) et déplacer la dernière instruction à l'intérieur du reste que suivre

 // Get Avtive Session again in case of session is null 
     Session session1 = Session.getActiveSession(); 
    } else { 
     Session.getActiveSession().addCallback(statusCallback); 
    }

Source

2014-07-18 16:13:13

Salut Omar, merci pour votre contribution et je l'ai beaucoup apprécié. Je ne suis pas sûr si j'ai appliqué les suggestions assez bien, mais je reçois toujours cette erreur, et ai mis à jour le code mis à jour qui traite de NullPointerException à la publication initiale. – user3827788

Vous devez déplacer cette instruction Session.getActiveSession(). AddCallback (statusCallback); ne pas le copier –

Sur le code mis à jour supprimer la déclaration après ce commentaire // Ajouter un rappel de session Ici, alors tout devrait être ok –

Une erreur inattendue s'est produite lors du lancement de l'application/activité Android

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