Catch Exception from child activity in Parent activity

Question

I've been wondering if it's possible to stop a crash in an Android App by capturing said crash in a parent activity. Lets say I cause a Fatal Exception in the onCreate Method of a child activity, will I be able to capture that exception in anyway? Or will the app crash no matter what I try? Here is an example of what i mean: Main.java ``` @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.ly_main); // My Main activity starts try{ // Call the next activity Intent intent = new Intent(getApplicationContext(), Child.class); startActivity(intent); }catch(Exception e){ Log.wtf("Exception_WTF","Exception from child activity woohoo 
 "+ e.toString()); } ``` Child.java ``` @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.ly_child); // Create exception... for science int a = 0; a = 1/a; } ``` This does not work. The child activity dies and takes the…

Accepted Answer

Hope I understand correctly what you want. You can look at FBReaderJ 's source code, it is an real world example to deal with your problem. They can do it very well: whenever app has error, they will show the error report dialog to user and they can filter the error by reading `Throwable` information. For example, take a look at BookInfoActivity, they registered the Exception Handler like this:

```
Thread.setDefaultUncaughtExceptionHandler(
        new org.geometerplus.zlibrary.ui.android.library.UncaughtExceptionHandler(this)
    );
```

then the UncaughtExceptionHandler class will handle errors:

```
  @Override
public void uncaughtException(Thread thread, Throwable exception) {
    final StringWriter stackTrace = new StringWriter();
    exception.printStackTrace(new PrintWriter(stackTrace));
    System.err.println(stackTrace);

if(myContext != null && myContext instanceof Activity){
        ((Activity)myContext).finish();
        return;
    }

// filter the error by get throwable class name and put them into 
    // intent action which registered in manifest with particular handle activity.
    Intent intent = new Intent(
        "android.fbreader.action.CRASH",
        new Uri.Builder().scheme(exception.getClass().getSimpleName()).build()
    );
    try {
        myContext.startActivity(intent);
    } catch (ActivityNotFoundException e) {
    // or just go to the handle bug activity
        intent = new Intent(myContext, BugReportActivity.class);
        intent.putExtra(BugReportActivity.STACKTRACE, stackTrace.toString());
        myContext.startActivity(intent);
    }

if (myContext instanceof Activity) {
        ((Activity)myContext).finish();
    }

// kill the error thread
        Process.killProcess(Process.myPid());
    System.exit(10);
}
```

Hope this can help.

Catch Exception from child activity in Parent activity

Solution

Problem

Related problems