Android：如何在“强制关闭”后自动重启应用程序？

Question

在 Android 应用程序中，如果我们没有正确处理异常，我们通常会收到“强制关闭”错误。

如果我的应用程序被强制关闭，如何自动重启？

是否为此使用了任何特定权限？

Answer 1

要做到这一点，你必须做两件事：

1. 避免“强制关闭” - 应用程序崩溃的标准方式。
2. 在崩溃发生时设置重启机制。

请参阅下面的操作方法：

1. 调用Thread.setDefaultUncaughtExceptionHandler() 以捕获所有未捕获的异常，在这种情况下将调用uncaughtException() 方法。 “强制关闭”不会出现，应用程序将无响应，这不是一件好事。 为了在应用程序崩溃时重新启动您的应用程序，您应该执行以下操作：

2. 在onCreate 方法中，在你的主活动中初始化一个PendingIntent 成员：

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

然后将以下内容放入您的uncaughtException() 方法中：

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

您还必须致电System.exit()，否则将无法正常工作。 这样，您的应用程序将在 2 秒后重新启动。

最终，您可以在应用程序崩溃的意图中设置一些标志，并在您的 onCreate() 方法中显示一个对话框“对不起，应用程序崩溃了，希望再也不会 :)”。

Answer 2

诀窍是首先确保它不会强制关闭。

如果您使用the Thread.setDefaultUncaughtExceptionHandler() method，您可以捕获导致您的应用程序强制关闭的异常。

查看at this question 以获取使用UncaughtExceptionHandler 记录应用程序引发的异常的示例。

Answer 3

如果您使用 Crittercism 或其他一些错误报告服务，接受的答案几乎是正确的..

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);
            }
});

Answer 4

只需在你的包中添加这个类

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);
}}

在您的应用程序或每个活动类中，在 onCreate() 方法中，然后简单地调用：

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

Answer 5

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();  
    }

Answer 6

以下是对我有用的代码。你应该在MainActivity的onCreate()方法中调用appInitialization()

    /*
    * App Restart on crash logic
    * */

    public void triggerRestart(Activity context) {
        Intent intent = new Intent(context, MainActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(intent);
        if (context instanceof Activity) {
            finish();
        }
        Runtime.getRuntime().exit(0);
    }

    private void appInitialization() {
        defaultUEH = Thread.getDefaultUncaughtExceptionHandler();
        Thread.setDefaultUncaughtExceptionHandler(_unCaughtExceptionHandler);
    }

    //make crash report on ex.stackreport
    private Thread.UncaughtExceptionHandler defaultUEH;
    // handler listener
    private Thread.UncaughtExceptionHandler _unCaughtExceptionHandler = new Thread.UncaughtExceptionHandler() {
        @Override
        public void uncaughtException(Thread thread, Throwable ex) {
            // You can code here to send crash analytics
            ex.printStackTrace();
            triggerRestart(currentActivity);
        }
    };