Android: How to auto-restart application after it&

问题:

In an Android application, we usually got the \"Force Closed\" error if we didn\'t get the exceptions right.

How can I restart my application automatically if it force closed?

Is there any specific permission is used for this?

回答1:

To accomplish this you have to do two things:

1. Avoid the \"Force close\" - standard way of application crash.
2. Setup a restart mechanism when the crash happens anyway.

See below how to do these:

1. Call Thread.setDefaultUncaughtExceptionHandler() in order to catch all uncaught exception, in which case uncaughtException() method will be called. \"Force close\" will not appear and the application will be unresponsive, which is not a quite good thing. In order to restart your application when it crashed you should do the following :

2. In the onCreate method, in your main activity initialize a PendingIntent member:

   Intent intent = PendingIntent.getActivity(
       YourApplication.getInstance().getBaseContext(),
       0,
       new Intent(getIntent()),
       getIntent().getFlags());
   

Then put the following in your uncaughtException() method:

AlarmManager mgr = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
mgr.set(AlarmManager.RTC, System.currentTimeMillis() + 2000, intent);
System.exit(2);

You also must call System.exit(), otherwise will not work. In this way your application will restart after 2 seconds.

Eventually you can set some flag in your intent that the application crashed and in your onCreate() method you can show a dialog \"I\'m sorry, the application crashed, hope never again :)\".

回答2:

The trick is make sure it doesn\'t Force Close in the first place.

If you use the Thread.setDefaultUncaughtExceptionHandler() method you can catch the Exceptions that are causing your application to Force Close.

Have a look at this question for an example of using an UncaughtExceptionHandler to log the Exceptions raised by an application.

回答3:

If you use Crittercism or some other error report service, accepted answer is almost right..

final UncaughtExceptionHandler defaultHandler = Thread.getDefaultUncaughtExceptionHandler();
Thread.setDefaultUncaughtExceptionHandler(new UncaughtExceptionHandler() {
            public void uncaughtException(Thread thread, Throwable ex) {
              Intent launchIntent = new Intent(activity().getIntent());
              PendingIntent pending = PendingIntent.getActivity(CSApplication.getContext(), 0,
                    launchIntent, activity().getIntent().getFlags());
              getAlarmManager().set(AlarmManager.RTC, System.currentTimeMillis() + 2000, pending);
              defaultHandler.uncaughtException(thread, ex);
            }
});

回答4:

public class ForceCloseExceptionHandalingActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        setContentView(MyLayout());
        Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
            @Override
            public void uncaughtException(Thread paramThread, Throwable paramThrowable) {
                myHandaling(paramThread, paramThrowable);
            }
        });
    }

    private ViewGroup MyLayout(){
        LinearLayout mainLayout = new LinearLayout(this);
        mainLayout.setOrientation(LinearLayout.VERTICAL);  
        Button btnHello =new Button(this);
        btnHello.setText(\"Show all button\");
        btnHello.setOnClickListener(new OnClickListener() {         
            @Override
            public void onClick(View v) {                   
                setContentView(MyLayout2());            
            }
        });             
        mainLayout.addView(btnHello);       
        return mainLayout;
    }

    private ViewGroup MyLayout2(){
        LinearLayout mainLayout = new LinearLayout(this);
        mainLayout.setOrientation(LinearLayout.VERTICAL);  
        Button btnHello =new Button(this);
        btnHello.setText(\"I am a EEROR uncaughtException\");
        btnHello.setOnClickListener(new OnClickListener() {         
            @Override
            public void onClick(View v) {                   
                Log.e(\"Alert\",\"btn  uncaughtException::\");
                Toast.makeText(ForceCloseExceptionHandalingActivity.this, \"Alert uncaughtException222\",Toast.LENGTH_LONG).show();
                View buttone = null;
                setContentView(buttone);            
            }
        });     
        Button btnHello2 =new Button(this);
        btnHello2.setText(\"I am a EEROR Try n catch\");
        btnHello2.setOnClickListener(new OnClickListener() {            
            @Override
            public void onClick(View v) {   

                try{
                    View buttone = null;
                    setContentView(buttone);
                }
                catch (Exception e) {
                    Log.e(\"Alert\",\"Try n catch:::\");
                    Toast.makeText(ForceCloseExceptionHandalingActivity.this, \"Alert Try n catch\",Toast.LENGTH_LONG).show();
                    setContentView(MyLayout());
                }

            }
        });     
        mainLayout.addView(btnHello);
        mainLayout.addView(btnHello2);
        return mainLayout;
    }
    public void myHandaling(Thread paramThread, Throwable paramThrowable){
        Log.e(\"Alert\",\"Lets See if it Works !!!\" +\"paramThread:::\" +paramThread +\"paramThrowable:::\" +paramThrowable);
        Toast.makeText(ForceCloseExceptionHandalingActivity.this, \"Alert uncaughtException111\",Toast.LENGTH_LONG).show();
        Intent in =new Intent(ForceCloseExceptionHandalingActivity.this,com.satya.ForceCloseExceptionHandaling.ForceCloseExceptionHandalingActivity.class);
        startActivity(in);
        finish();
        android.os.Process.killProcess(android.os.Process.myPid()); 
    }
    @Override
    protected void onDestroy() {
        Log.e(\"Alert\",\"onDestroy:::\");
        Toast.makeText(ForceCloseExceptionHandalingActivity.this, \"Alert onDestroy\",Toast.LENGTH_LONG).show();
        super.onDestroy();  
    }

回答5:

Just add this class in your package

public class MyExceptionHandler implements
    java.lang.Thread.UncaughtExceptionHandler {
private final Context myContext;
private final Class<?> myActivityClass;

public MyExceptionHandler(Context context, Class<?> c) {
    myContext = context;
    myActivityClass = c;
}

public void uncaughtException(Thread thread, Throwable exception) {
    StringWriter stackTrace = new StringWriter();
    exception.printStackTrace(new PrintWriter(stackTrace));
    System.err.println(stackTrace);// You can use LogCat too
    Intent intent = new Intent(myContext, myActivityClass);
    String s = stackTrace.toString();
    //you can use this String to know what caused the exception and in which Activity
    intent.putExtra(\"uncaughtException\", \"Exception is: \" + stackTrace.toString());
    intent.putExtra(\"stacktrace\", s);
    myContext.startActivity(intent);
    //for restarting the Activity
    Process.killProcess(Process.myPid());
    System.exit(0);
}}

Then simply call:

Thread.setDefaultUncaughtExceptionHandler(new MyExceptionHandler(this,
            SplashScreenActivity.class));