我可以在应用程序崩溃之前调用方法吗？ [英] Can I call a method before my application go to crash

问题描述

我是android的新手，当我运行代码时，我总是看到Exception。
所以，有人可以告诉我在没有try-catch的应用程序崩溃之前我可以调用一个方法。

I'm a newbie in android and I always see Exception when I'm running my code. So, somebody can tell me Can I call a method before app go to crash anywhere without "try-catch".

推荐答案

这是处理未捕获异常的更好方法：

This would be better way to handle uncaught exception:

public class MyApplication extends Application {
@Override
    public void onCreate() {
        super.onCreate();
        appInitialization();
    }

    private void appInitialization() {
         defaultUEH = Thread.getDefaultUncaughtExceptionHandler();
         Thread.setDefaultUncaughtExceptionHandler(_unCaughtExceptionHandler);
    }

    private UncaughtExceptionHandler defaultUEH;

    // handler listener
    private Thread.UncaughtExceptionHandler _unCaughtExceptionHandler = new Thread.UncaughtExceptionHandler() {
        @Override
        public void uncaughtException(Thread thread, Throwable ex) {
            ex.printStackTrace();
            // TODO handle exception here
        }
    };
}

应用程序是需要维护全局应用程序状态的人的基类。因此，处理此类异常将是一个更好的地方。

Application is a Base class for those who need to maintain global application state. And hence here, it will be a better place to handle such exceptions.

编辑：
以上代码将处理未捕获的异常如果他们被抛入UI线程。
如果工作线程中发生异常，您可以通过以下方式处理它：

The above code will handle uncaught exceptions if they are thrown inside UI thread. If an exception has occurred in worker thread, you can handle it in following way:

private boolean isUIThread(){
        return Looper.getMainLooper().getThread() == Thread.currentThread();
    }
// Setup handler for uncaught exceptions.
    Thread.setDefaultUncaughtExceptionHandler (new Thread.UncaughtExceptionHandler()
    {
        @Override
        public void uncaughtException (Thread thread, Throwable e)
        {
            handleUncaughtException (thread, e);
        }
    });

    public void handleUncaughtException(Thread thread, Throwable e) {
        e.printStackTrace(); // not all Android versions will print the stack trace automatically

        if (isUIThread()) {
            // exception occurred from UI thread
            invokeSomeActivity();

        } else {  //handle non UI thread throw uncaught exception

            new Handler(Looper.getMainLooper()).post(new Runnable() {
                @Override
                public void run() {
                    invokeSomeActivity();
                }
            });
        }
    }

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