Android全局错误处理和报告活动

问题描述

我有办法注册全局错误处理程序，以防止应用程序崩溃？这里描述了崩溃报告：，在收到未捕获的例外之后，我从未能够开始新的活动。看起来整个过程被系统切换到一个特殊的状态，阻止他允许任何新的资源。

目前我发现的唯一选项是发送在应用程序重新启动后由系统保留的状态栏通知。当用户选择该通知时，通知会触发对话活动的意图。

Alexey Yakovlev在这个问题上研究了更多的细节，得出结论，可能会有一个在不是UI线程的线程上发生崩溃时触发新活动的机会。虽然我们没有找到一个简单的解决方法，直接在所有情况下开始一个活动。

我已经摆脱了默认的强制关闭对话框，通过杀死自己的过程，而不调用orginial默认未捕获异常处理程序。

I there any way to register a global error handler that will prevent application from crashing? Crashing reporting is described here: How do I obtain crash-data from my Android application?. One thought I had was to extend these solutions to take in the application context so a redirect to a particular reporting activity could be made? But not sure if the application context is valid at this point once there is a crash to report?

But how can you redirect user to a global error message Activity when there is a crash? Is there some high level way to register an error handler that will catch all errors and prevent a crash? Is there a way to register such a handler so that it prevents or survives a crash and then redirects the user to a particular activity which will show the error message in question?

Here is my modification to error handler:

1) Just pass applicationContext into constructor as ctx

2) add reportError(stackTrace) method to transfer control to error message page

private void reportError(String stackTrace){
        Intent i = new Intent(ctx, DisplayErrorActivity.class);
        i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        i.setAction("DISPLAY_ERROR_ACTIVITY");
        Bundle b = new Bundle();
        b.putString("STACKTRACE", stackTrace);

        i.putExtras(b);
        try{
             Log.d("MyErrorHandler","reportError ctx="+ctx);
             ctx.startActivity(i);
        } catch (Exception e) {
             Exception ex = e;
             e.printStackTrace();
        }

    }

And call reportError below:

public void uncaughtException(Thread t, Throwable e) {
        Log.d("MyUncoughtExceptionHandler", "uncoughtException ctx="+ctx);
        String timestamp=getDateTime();
        final Writer result = new StringWriter();
        final PrintWriter printWriter = new PrintWriter(result);
        e.printStackTrace(printWriter);
        String stacktrace = result.toString();
        printWriter.close();
        String filename = timestamp + ".stacktrace";
        Log.d("MyexceptionHanlder","UncoughtException: "+stacktrace);
        if (localPath != null) {
            writeToFile(stacktrace, filename);
        }
        if (url != null) {
            sendToServer(stacktrace, filename);
        }
        reportError(stacktrace);
       // defaultUEH.uncaughtException(t, e);

    }

If I leave commented defaultUEH it shows usual crash dialog. Without it - blank screen. Log indicates that ErrorMessageActivity is force closed along with the process.

To test I just put divide by zero in create method of main activity right after registering the error handler with the thread. If I had a try-catch block over this it would not crash, but the global error handler does not seem to prevent crash. Checked ctx and it seems valid in a debugger.

解决方案

When implementing ACRA, I have never been able to start a new Activity after receiving an uncaught exception. It looks like the whole process is switched by the system to a special state preventing him from allowing any new resource.

The only option I have found for the moment is to send a status bar notification which is kept by the system after the application being restarted. The notification then triggers an intent for a dialog activity when the user selects it.

Alexey Yakovlev studied in much more details this issue and came to the conclusion that there could be a chance of triggering a new activity when the crash occurs on a thread which is not the UI thread. Though we did not find a simple enough workaround to start directly an activity in all cases.

I got rid of the default force close dialog by killing the process myself without invoking the orginial default uncaught exception handler.

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