在Android 4.3中启动服务时出错

Question

我有一个服务类，在那里我定义了我的所有音乐播放/暂停功能。同一个类实现了SensorEventListener，当我在Android4.3 上测试它时，我收到了这个错误

完整Logcat:

        12-16 23:18:03.194: E/AndroidRuntime(966): java.lang.RuntimeException:
        Unable to   start service com.example.proximitybasedmediaplayer.PlayerService@41cf8d68 
        with Intent { cmp=com.example.proximitybasedmediaplayer/.PlayerService (has extras) }:
        java.lang.ArrayIndexOutOfBoundsException: length=12; index=-1
        12-17 00:33:40.754: E/AndroidRuntime(1341): FATAL EXCEPTION: main
        12-17 00:33:40.754: E/AndroidRuntime(1341): java.lang.RuntimeException: Unable to start service com.example.proximitybasedmediaplayer.PlayerService@41cf8d48 with Intent { cmp=com.example.proximitybasedmediaplayer/.PlayerService (has extras) }: java.lang.ArrayIndexOutOfBoundsException: length=12; index=-1
        12-17 00:33:40.754: E/AndroidRuntime(1341):     at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2721)
        12-17 00:33:40.754: E/AndroidRuntime(1341):     at android.app.ActivityThread.access$1900(ActivityThread.java:141)
        12-17 00:33:40.754: E/AndroidRuntime(1341):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1353)
        12-17 00:33:40.754: E/AndroidRuntime(1341):     at android.os.Handler.dispatchMessage(Handler.java:99)
        12-17 00:33:40.754: E/AndroidRuntime(1341):     at android.os.Looper.loop(Looper.java:137)
        12-17 00:33:40.754: E/AndroidRuntime(1341):     at android.app.ActivityThread.main(ActivityThread.java:5103)
        12-17 00:33:40.754: E/AndroidRuntime(1341):     at java.lang.reflect.Method.invokeNative(Native Method)
        12-17 00:33:40.754: E/AndroidRuntime(1341):     at java.lang.reflect.Method.invoke(Method.java:525)
        12-17 00:33:40.754: E/AndroidRuntime(1341):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
        12-17 00:33:40.754: E/AndroidRuntime(1341):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
        12-17 00:33:40.754: E/AndroidRuntime(1341):     at dalvik.system.NativeStart.main(Native Method)
        12-17 00:33:40.754: E/AndroidRuntime(1341): Caused by: java.lang.ArrayIndexOutOfBoundsException: length=12; index=-1
        12-17 00:33:40.754: E/AndroidRuntime(1341):     at java.util.ArrayList.get(ArrayList.java:310)
        12-17 00:33:40.754: E/AndroidRuntime(1341):     at com.example.proximitybasedmediaplayer.PlayerService.initNotification(PlayerService.java:585)
        12-17 00:33:40.754: E/AndroidRuntime(1341):     at com.example.proximitybasedmediaplayer.PlayerService.onStartCommand(PlayerService.java:177)
        12-17 00:33:40.754: E/AndroidRuntime(1341):     at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2704)
        12-17 00:33:40.754: E/AndroidRuntime(1341):     ... 10 more

它适用于4.2或更低版本。

是什么逻辑使它在4.2中有效而在4.3中无效？有意传递临时演员有什么变化吗？

此外，在崩溃后，我看到在服务中编写的侦听器部分被调用。抛出错误的服务启动意味着什么？我无法理解事物是如何被调用的。我已经在try-catch下编写了所有的代码，但它仍然会崩溃。（仅在4.3版本中）

很抱歉没有提供任何代码，因为这是一个很大的文件。

感谢您的帮助。

代码：

    public void playSong(int songIndex) {
    // Play song
    try {
        initUI();
        mp.reset();
        mp.setDataSource(songsListingSD.get(songIndex).get("songPath"));
        mp.prepare();
        mp.start();
        // Displaying Song title
        String songTitle = songsListingSD.get(songIndex).get("songTitle");
        if(songTitle != null)
        {
        songTitleLabel.get().setText(songTitle);
        }
        // Changing Button Image to pause image
        if(btnPlay!=null)
        {   
        btnPlay.get().setImageResource(R.drawable.ic_media_pause);
        }
        // set Progress bar values
        songProgressBar.get().setProgress(0);
        songProgressBar.get().setMax(100);
        // Updating progress bar
        updateProgressBar();
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    catch(Exception e)
    {e.printStackTrace();}
}

这个方法在内部被调用：

SensorEventListener proximityListener = new SensorEventListener(){
            @Override
            public void onAccuracyChanged(Sensor sensor, int accuracy) {
                // TODO Auto-generated method stub
            }
            @Override
            public void onSensorChanged(SensorEvent event) {
                // TODO Auto-generated method stub
                Log.d("Debug", "Proximity Sensor");
                Random rand = new Random();
                try{
                currentSongIndex = rand.nextInt((songsListingSD.size() - 1) - 0 + 1) + 0;
                }
                catch(Exception e)
                {
                    e.printStackTrace();
                }
                try{
                playSong(currentSongIndex);
                    Log.d("Test","Test");
                }
                catch(Exception e)
                {
                    e.printStackTrace();
                }
            }};

initUI部分是：

private void initUI() {
    try{
    songTitleLabel = new WeakReference<TextView>(MainActivity.songTitle);
    songCurrentDurationLabel = new WeakReference<TextView>(
            MainActivity.songCurrentDurationLabel);
    songTotalDurationLabel = new WeakReference<TextView>(
            MainActivity.songTotalDurationLabel);
    btnPlay = new WeakReference<ImageView>(MainActivity.btnPlay);
    if(btnPlay!= null)
    {
        Log.d("Debug", "btnPlay not null11");
    }
    btnForward = new WeakReference<ImageView>(MainActivity.btnForward);
    btnBackward = new WeakReference<ImageView>(MainActivity.btnBackward);
    btnNext = new WeakReference<ImageView>(MainActivity.btnNext);
    btnPrevious = new WeakReference<ImageView>(MainActivity.btnPrevious);
    btnRepeat = new WeakReference<ImageButton>(MainActivity.btnRepeat);
    btnShuffle = new WeakReference<ImageButton>(MainActivity.btnShuffle);
    btnPlay.get().setOnClickListener(this);
    btnForward.get().setOnClickListener(this);
    btnBackward.get().setOnClickListener(this);
    btnNext.get().setOnClickListener(this);
    btnPrevious.get().setOnClickListener(this);
    btnRepeat.get().setOnClickListener(this);
    btnShuffle.get().setOnClickListener(this);
    // TODO Auto-generated method stub
    songProgressBar = new WeakReference<SeekBar>(
            MainActivity.songProgressBar);
    songProgressBar.get().setOnSeekBarChangeListener(this);
    }
    catch(Exception e){
        Log.d("ERROR","Inside initComp Service Class");
        e.printStackTrace();}
}

变量为：

 private WeakReference<ImageButton> btnRepeat, btnShuffle;
private WeakReference<ImageView> btnPlay, btnForward, btnBackward, btnNext,
        btnPrevious;
private WeakReference<SeekBar> songProgressBar;
private WeakReference<TextView> songTitleLabel;
private WeakReference<TextView> songCurrentDurationLabel;
private WeakReference<TextView> songTotalDurationLabel;
public static MediaPlayer mp;
private Handler progressBarHandler = new Handler();;
private Utilities utils;
private int seekForwardTime = 5000; // 5000 milliseconds
private int seekBackwardTime = 5000; // 5000 milliseconds
private boolean isShuffle = false;
private boolean isRepeat = false;
private ArrayList<HashMap<String, String>> songsListingSD = new ArrayList<HashMap<String, String>>();
private ArrayList<MusicMetadata> songListingRecent = new ArrayList<MusicMetadata>();
public static int currentSongIndex = -1;

Answer 1

您有com.example.proximitybasedmediaplayer.PlayerService.initNotification (PlayerService.java:585)的来源吗？它尝试从索引为-1的ArrayList中提取-1是在找不到某个东西时，search something方法返回的值。如果你有来源，找出要搜索的内容，很可能是缺少了一个论点。如果没有源代码，可以使用adb从设备中获取apk文件，并使用jad对源代码进行解码。解码后的源代码不会编译，但会以某种方式可读。

日志中出现异常并不意味着服务无法启动。程序员可能更喜欢捕捉异常，而不是检查索引==-1。e.printStackTrace（）是大多数IDE自动插入到catch块中的内容。