Source code
Revision control
Copy as Markdown
Other Tools
/*
* Copyright 2013 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
package org.appspot.apprtc;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.util.Log;
import android.util.TypedValue;
import android.widget.ScrollView;
import android.widget.TextView;
import java.io.PrintWriter;
import java.io.StringWriter;
/**
* Singleton helper: install a default unhandled exception handler which shows
* an informative dialog and kills the app. Useful for apps whose
* error-handling consists of throwing RuntimeExceptions.
* NOTE: almost always more useful to
* Thread.setDefaultUncaughtExceptionHandler() rather than
* Thread.setUncaughtExceptionHandler(), to apply to background threads as well.
*/
public class UnhandledExceptionHandler implements Thread.UncaughtExceptionHandler {
private static final String TAG = "AppRTCMobileActivity";
private final Activity activity;
public UnhandledExceptionHandler(final Activity activity) {
this.activity = activity;
}
@Override
public void uncaughtException(Thread unusedThread, final Throwable e) {
activity.runOnUiThread(new Runnable() {
@Override
public void run() {
String title = "Fatal error: " + getTopLevelCauseMessage(e);
String msg = getRecursiveStackTrace(e);
TextView errorView = new TextView(activity);
errorView.setText(msg);
errorView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 8);
ScrollView scrollingContainer = new ScrollView(activity);
scrollingContainer.addView(errorView);
Log.e(TAG, title + "\n\n" + msg);
DialogInterface.OnClickListener listener = new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
System.exit(1);
}
};
AlertDialog.Builder builder = new AlertDialog.Builder(activity);
builder.setTitle(title)
.setView(scrollingContainer)
.setPositiveButton("Exit", listener)
.show();
}
});
}
// Returns the Message attached to the original Cause of `t`.
private static String getTopLevelCauseMessage(Throwable t) {
Throwable topLevelCause = t;
while (topLevelCause.getCause() != null) {
topLevelCause = topLevelCause.getCause();
}
return topLevelCause.getMessage();
}
// Returns a human-readable String of the stacktrace in `t`, recursively
// through all Causes that led to `t`.
private static String getRecursiveStackTrace(Throwable t) {
StringWriter writer = new StringWriter();
t.printStackTrace(new PrintWriter(writer));
return writer.toString();
}
}