content: /*
   * libjingle
   * Copyright 2013, Google Inc.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   *  1. Redistributions of source code must retain the above copyright notice,
   *     this list of conditions and the following disclaimer.
   *  2. Redistributions in binary form must reproduce the above copyright notice,
   *     this list of conditions and the following disclaimer in the documentation
   *     and/or other materials provided with the distribution.
   *  3. The name of the author may not be used to endorse or promote products
   *     derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
   * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  package im.actor.sdk.controllers.calls;
  
  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 = "AppRTCDemoActivity";
      private final Activity activity;
  
      public UnhandledExceptionHandler(final Activity activity) {
          this.activity = activity;
      }
  
      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();
      }
  }
  