java - 退出应用程序时出现 IllegalStateException

Question

我有 Runnable，它在 MediaPlayer Service 的 Thread 中运行。当我停止服务后退出应用程序时，我收到 IllegalStateException。

这是 Runnable

Runnable runnable = new Runnable() {
        public void run() {
            while (isActive) {
                while (progressStatus < 1000) {
                    progressStatus += 1;
                    // Update the progress bar and display the
                    //current value in the text view
                    handler.post(new Runnable() {
                        public void run() {
                            if (result != null) {
                                result.putInt(UIFragment.MAX_KEY, mPlayer.getDuration());
                                result.putInt(UIFragment.PROGRESS_KEY, mPlayer.getCurrentPosition());
                                progressReciever.send(UIFragment.RESULT_DATA_RETURNED, result);
                            } else {
                                Log.d("Player", "is null");
                            }
                        }
                    });
                    try {
                        // Sleep for 200 milliseconds.
                        //Just to display the progress slowly
                        Thread.sleep(200);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }

            }
        }
    };

这是它在 onPrepared

中的调用方式

            handler=new Handler();
            thread= new Thread(runnable);
            thread.start();

在我的 onDestroy 中调用

handler.removeCallbacks(runnable);
thread.interrupt();

编辑堆栈跟踪

02-13 00:04:19.722  13929-13929/com.brianstacks.servicefundamentals E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.brianstacks.servicefundamentals, PID: 13929
    java.lang.IllegalStateException
            at android.media.MediaPlayer.getDuration(Native Method)
            at com.brianstacks.servicefundamentals.services.MusicPlayerService$1$1.run(MusicPlayerService.java:65)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

Answer 1

我通过一起删除新的 Thread 并让 Handler 控制 Runnable 来修复它 这是代码:

private Runnable r = new Runnable() {

        public void run() {
            if (result != null) {
                result.putInt(UIFragment.MAX_KEY, mPlayer.getDuration());
                result.putInt(UIFragment.PROGRESS_KEY, mPlayer.getCurrentPosition());
                progressReciever.send(UIFragment.RESULT_DATA_RETURNED, result);

            } else {
                Log.d("Player", "is null");
            }
            handler.postDelayed(this, 1000);
        }
    };

在onPrepared

handler=new Handler();
handler.postDelayed(r, 1000);

在onDestroy中

handler.removeCallbacks(r);

感谢@Submersed 让我更多地思考逻辑，现在应用程序可以正常退出。