android - 在 `Thread.setDefaultUncaughtExceptionHandler` 中显示一个对话框

Question

当我的 android 应用程序抛出异常时，我想显示一个自定义对话框来告诉用户发生了错误，所以我使用 Thread.setDefaultUncaughtExceptionHandler 来设置全局异常处理程序:

public class MyApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();

        Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
            @Override
            public void uncaughtException(Thread thread, final Throwable ex) {
                AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext());
                builder.setTitle("There is something wrong")
                        .setMessage("Application will exit：" + ex.toString())
                        .setPositiveButton("OK", new DialogInterface.OnClickListener() {

                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                // throw it again
                                throw (RuntimeException) ex;
                            }
                        })
                        .show();
            }
        });
    }

}

但我发现它有任何异常抛出，AlertDialog不会显示，相反，应用程序阻塞，一段时间后，它会显示一个系统对话框:

X app is not responding. Would you like to close it?
Wait  |  OK

我现在该怎么办？

---

更新

日志:

11-16 12:54:16.017: WARN/WindowManager(90): Attempted to add window with non-application token WindowToken{b38bb6a8 token=null}.  Aborting.

似乎错误来自 new AlertDialog.Builder(getApplicationContext());

但这是 Application 子类中的异常处理程序，我该如何为其设置 Activity 实例？

Answer 1

您不能从这里进行任何 UI 操作。只需开始另一个 Activity/启动屏幕。传递一个额外的 Intent 来表示崩溃并在该 Activity 中显示对话框。

    /*
     * (non-Javadoc)
     * 
     * @see
     * java.lang.Thread.UncaughtExceptionHandler#uncaughtException(java.
     * lang.Thread, java.lang.Throwable)
     */
    @Override
    public void uncaughtException(Thread t, final Throwable e) {
        StackTraceElement[] arr = e.getStackTrace();
        final StringBuffer report = new StringBuffer(e.toString());
        final String lineSeperator = "-------------------------------\n\n";
        report.append(DOUBLE_LINE_SEP);
        report.append("--------- Stack trace ---------\n\n");
        for (int i = 0; i < arr.length; i++) {
            report.append( "    ");
            report.append(arr[i].toString());
            report.append(SINGLE_LINE_SEP);
        }
        report.append(lineSeperator);
        // If the exception was thrown in a background thread inside
        // AsyncTask, then the actual exception can be found with getCause
        report.append("--------- Cause ---------\n\n");
        Throwable cause = e.getCause();
        if (cause != null) {
            report.append(cause.toString());
            report.append(DOUBLE_LINE_SEP);
            arr = cause.getStackTrace();
            for (int i = 0; i < arr.length; i++) {
                report.append("    ");
                report.append(arr[i].toString());
                report.append(SINGLE_LINE_SEP);
            }
        }
        // Getting the Device brand,model and sdk verion details.
        report.append(lineSeperator);
        report.append("--------- Device ---------\n\n");
        report.append("Brand: ");
        report.append(Build.BRAND);
        report.append(SINGLE_LINE_SEP);
        report.append("Device: ");
        report.append(Build.DEVICE);
        report.append(SINGLE_LINE_SEP);
        report.append("Model: ");
        report.append(Build.MODEL);
        report.append(SINGLE_LINE_SEP);
        report.append("Id: ");
        report.append(Build.ID);
        report.append(SINGLE_LINE_SEP);
        report.append("Product: ");
        report.append(Build.PRODUCT);
        report.append(SINGLE_LINE_SEP);
        report.append(lineSeperator);
        report.append("--------- Firmware ---------\n\n");
        report.append("SDK: ");
        report.append(Build.VERSION.SDK);
        report.append(SINGLE_LINE_SEP);
        report.append("Release: ");
        report.append(Build.VERSION.RELEASE);
        report.append(SINGLE_LINE_SEP);
        report.append("Incremental: ");
        report.append(Build.VERSION.INCREMENTAL);
        report.append(SINGLE_LINE_SEP);
        report.append(lineSeperator);

        Log.e("Report ::", report.toString());
        Intent crashedIntent = new Intent(BaseActivity.this, SplashActivity.class);
        crashedIntent.putExtra(EXTRA_CRASHED_FLAG,  "Unexpected Error occurred.");
        crashedIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
        crashedIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(crashedIntent);

        System.exit(0);
        // If you don't kill the VM here the app goes into limbo

    }

另见:

Android UncaughtExceptionHandler that instantiates an AlertDialog breaks

Toast not showing up in UnCaughtExceptionHandler

How to start activity from UncaughtExceptionHandler if this is main thread crashed?

我是如何做到的:

我有一个扩展 Activity 的 BaseActivity，并在该 Activity 的 onCreate 中设置了 UncaughtExceptionHandler。我所有的 Activity 都扩展了 BaseActivity 而不是 Activity。

按键

1. 您不能在Application.onCreate中设置异常处理程序，而是应该创建一个BaseActivity并将其设置在onCreate中方法。
2. 启动SplashActivity后，我们应该调用System.exit(0)
3. 我们不能将错误实例共享给SplashActivity，因为它会被销毁，相反，我们可以传递一些错误消息或将其保存在文件中。