[Android] benchmark: add vlc crash handler

[Duncan McNamara]

vlc-android | branch: master | Duncan McNamara <dcn.mcnamara at gmail.com> | Fri Jan  6 16:51:13 2017 +0100| [db62c7bb151f48384cfed77f60b314c9256ea375] | committer: Geoffrey Métais

benchmark: add vlc crash handler

allows the benchmark app to
get vlc crash cause

> https://code.videolan.org/videolan/vlc-android/commit/db62c7bb151f48384cfed77f60b314c9256ea375
---

 .../gui/video/benchmark/StartActivityOnCrash.java  | 68 ++++++++++++++++++++++
 1 file changed, 68 insertions(+)

diff --git a/vlc-android/src/org/videolan/vlc/gui/video/benchmark/StartActivityOnCrash.java b/vlc-android/src/org/videolan/vlc/gui/video/benchmark/StartActivityOnCrash.java
new file mode 100644
index 0000000..08c31c2
--- /dev/null
+++ b/vlc-android/src/org/videolan/vlc/gui/video/benchmark/StartActivityOnCrash.java
@@ -0,0 +1,68 @@
+/*****************************************************************************
+ * StartActivityOnCrash.java
+ *****************************************************************************
+ * Copyright © 2011-2014 VLC authors and VideoLAN
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+package org.videolan.vlc.gui.video.benchmark;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.util.Log;
+
+import java.io.PrintWriter;
+import java.io.StringWriter;
+
+public final class StartActivityOnCrash implements Thread.UncaughtExceptionHandler {
+
+    private static final String SHARED_PREFERENCE = "org.videolab.vlc.gui.video.benchmark.UNCAUGHT_EXCEPTIONS";
+    private static final String SHARED_PREFERENCE_STACK_TRACE = "org.videolab.vlc.gui.video.benchmark.STACK_TRACE";
+
+    private static final int MAX_STACK_TRACE_SIZE = 131071; //128 KB - 1
+
+    private SharedPreferences preferences;
+    private Activity context;
+
+    StartActivityOnCrash(Activity context) {
+        //noinspection deprecation
+        preferences = context.getSharedPreferences(SHARED_PREFERENCE, Context.MODE_WORLD_READABLE);
+        this.context = context;
+    }
+
+    @Override
+    public void uncaughtException(Thread thread, final Throwable throwable) {
+        String exceptionMessage = throwable.getMessage();
+
+        //see TransactionTooLargeException
+        if (exceptionMessage.length() > MAX_STACK_TRACE_SIZE)
+            exceptionMessage = exceptionMessage.substring(0, MAX_STACK_TRACE_SIZE - 3) + "...";
+
+        preferences.edit().putString(SHARED_PREFERENCE_STACK_TRACE, exceptionMessage).commit();
+        android.os.Process.killProcess(android.os.Process.myPid());
+        System.exit(10);
+    }
+
+    public static boolean setUp(Activity context) {
+        try {
+            Thread.setDefaultUncaughtExceptionHandler(new StartActivityOnCrash(context));
+        } catch (Exception e) {
+            return false;
+        }
+        return true;
+    }
+}