java.lang.IndexOutOfBoundsException：索引0无效，大小为0 Android musicplayer

时间：2016-06-04 01:55:17

标签： java android

我正在开发一个音乐应用程序，但我一直在发现这个错误，我不理解它，也不知道如何解决。我被困了2天试图重新编写代码，但仍然出现错误弹出。我的logcat出现为java.lang.IndexOutOfBoundsException：索引0无效，大小为0.请详细说明主要问题。

此MainActivity.java 

  package com.developer.bunamay.player;

      import android.app.SearchManager;
      import android.content.ComponentName;
      import android.content.Context;
      import android.content.Intent;
      import android.content.ServiceConnection;
      import android.content.res.Resources;
      import android.graphics.Bitmap;
      import android.graphics.PorterDuff;
      import android.graphics.drawable.BitmapDrawable;
      import android.os.Bundle;
      import android.os.Handler;
      import android.os.IBinder;
      import android.os.Message;
      import android.support.v4.content.ContextCompat;
      import android.support.v7.app.AppCompatActivity;
      import android.text.TextUtils;
      import android.util.Log;
      import android.view.Menu;
      import android.view.MenuItem;
      import android.view.View;
      import android.view.animation.Animation;
      import android.view.animation.AnimationUtils;
      import android.widget.AdapterView;
      import android.widget.Button;
      import android.widget.ImageView;
      import android.widget.LinearLayout;
      import android.widget.ListView;
      import android.widget.SearchView;
      import android.widget.SeekBar;
      import android.widget.TextView;

      import java.util.List;



public class MainActivity extends AppCompatActivity implements MusicService.MediaFileListener {

public static final PlayerUtils PlayerController = PlayerUtils.getInstance();

public static final int PICK_FOLDER_REQUEST = 8;
private MediaFileAdapter mediaFileAdapter = null;
private TextView playingSong;
private Button btnPause, btnPlay, btnNext, btnPrevious;
private Button btnStop;
private LinearLayout linearLayoutPlayingSong;
private ListView mediaListView;
private SeekBar seekbar;
private TextView textBufferDuration, textDuration;
private ImageView imageViewAlbumArt;
private Context context;

MusicService mService;
boolean mBound = false;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    context = MainActivity.this;
    init();

    if (!PlayerUtils.isServiceRunning(MusicService.class.getName(), getApplicationContext())) {
        Intent i = new Intent(getApplicationContext(), MusicService.class);
        startService(i);
    }
}

private void init() {
    initViews();
    setListeners();
    playingSong.setSelected(true);
    seekbar.getProgressDrawable().setColorFilter(ContextCompat.getColor(context, R.color.colorText), PorterDuff.Mode.SRC_IN);
    if (PlayerController.SONGS_LIST.size() <= 0) {
        PlayerController.SONGS_LIST = PlayerController.listOfSongs(getApplicationContext());
    }
    initAdapter();
}

private void initAdapter() {
    mediaFileAdapter = new MediaFileAdapter(this, R.layout.custom_list, PlayerController.SONGS_LIST);
    mediaListView.setAdapter(mediaFileAdapter);
    mediaListView.setTextFilterEnabled(true);
    mediaListView.setFastScrollEnabled(true);
}

private void initViews() {
    playingSong = (TextView) findViewById(R.id.textNowPlaying);
    mediaListView = (ListView) findViewById(R.id.listViewMusic);
    btnPause = (Button) findViewById(R.id.btnPause);
    btnPlay = (Button) findViewById(R.id.btnPlay);
    linearLayoutPlayingSong = (LinearLayout) findViewById(R.id.linearLayoutPlayingSong);
    seekbar = (SeekBar) findViewById(R.id.seekBar);
    btnStop = (Button) findViewById(R.id.btnStop);
    textBufferDuration = (TextView) findViewById(R.id.textBufferDuration);
    textDuration = (TextView) findViewById(R.id.textDuration);
    imageViewAlbumArt = (ImageView) findViewById(R.id.imageViewAlbumArt);
    btnNext = (Button) findViewById(R.id.btnNext);
    btnPrevious = (Button) findViewById(R.id.btnPrevious);
}

private Animation setButtonAnimation() {
    return AnimationUtils.loadAnimation(this, R.anim.button_anim);
}

// defines callbacks for service binding, passed to bindService()
private ServiceConnection mConnection = new ServiceConnection() {

    @Override
    public void onServiceConnected(ComponentName className,
                                   IBinder service) {
        MusicService.LocalBinder binder = (MusicService.LocalBinder) service;
        mService = binder.getService();
        mService.setListener(MainActivity.this);
        mBound = true;

    }

    @Override
    public void onServiceDisconnected(ComponentName arg0) {
        mBound = false;
        mService = null;

    }
};


private void setListeners() {
    mediaListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View item, int position, long id) {
            PlayerController.SONG_PAUSED = false;
            PlayerController.SONG_NUMBER = position;
            boolean isServiceRunning = PlayerUtils.isServiceRunning(MusicService.class.getName(), getApplicationContext());
            if (!isServiceRunning) {
                Intent i = new Intent(getApplicationContext(), MusicService.class);
                startService(i);
            } else {
                PlayerController.SONG_CHANGE_HANDLER.sendMessage(
                        PlayerController.SONG_CHANGE_HANDLER.obtainMessage());
            }
            updateUI();
            changeButton();
        }
    });

    btnPlay.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            PlayerController.playControl(getApplicationContext());
        }
    });
    btnPause.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            PlayerController.pauseControl(getApplicationContext());
        }
    });
    btnNext.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            v.startAnimation(setButtonAnimation());
            PlayerController.nextControl(getApplicationContext());
        }
    });
    btnPrevious.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            v.startAnimation(setButtonAnimation());
            PlayerController.previousControl(getApplicationContext());
        }
    });
    btnStop.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (PlayerUtils.isServiceRunning(MusicService.class.getName(), getApplicationContext())) {
                PlayerController.pauseControl(getApplicationContext());
            }
            linearLayoutPlayingSong.setVisibility(View.GONE);
        }
    });

    seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
        @Override
        public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
            if (fromUser) {
                // clicked position on the seekBar
                int currentSeekBarPosition = seekBar.getProgress();
                // 1% of song duration = song duration / 100%
                int onePercentOfSongDuration = (mService.getDuration() / 100);
                // associate song duration with clicked position on the seekBar
                int changedPosition = currentSeekBarPosition * onePercentOfSongDuration;

                // seek to selected position
                PlayerController.seekToAnyControl(getApplicationContext(), changedPosition);
            }
        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {
        }

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {

        }
    });
}

@Override
protected void onPause() {
    if (mBound) {
        unbindService(mConnection);
    }
    super.onPause();
}

@Override
protected void onResume() {
    super.onResume();
    Intent i = new Intent(getApplicationContext(), MusicService.class);
    bindService(i, mConnection, Context.BIND_AUTO_CREATE);

    handleAudioFromOpenWithPopup();

    boolean isServiceRunning = PlayerUtils.isServiceRunning(MusicService.class.getName(), getApplicationContext());
    if (isServiceRunning) {
        updateUI();
    } else {
        linearLayoutPlayingSong.setVisibility(View.GONE);
    }
    changeButton();
    PlayerController.SEEKBAR_HANDLER = new Handler() {
        @Override
        public void handleMessage(Message msg) {

            Integer i[] = (Integer[]) msg.obj;
            textBufferDuration.setText(PlayerUtils.getDuration(i[0]));
            textDuration.setText(PlayerUtils.getDuration(i[1]));
            seekbar.setProgress(i[2]);
        }
    };
}

public void updateUI() {
    MediaFile mediaFile = PlayerController.SONGS_LIST.get(PlayerController.SONG_NUMBER);
    String nowPlayingTitleText = mediaFile.getTitle() + " " + mediaFile.getArtist() + "-" + mediaFile.getAlbum();
    playingSong.setText(nowPlayingTitleText);
    Bitmap albumArt = PlayerController.getAlbumart(context, mediaFile.getAlbumId());
    if (albumArt != null) {
        imageViewAlbumArt.setBackgroundDrawable(new BitmapDrawable(Resources.getSystem(), albumArt));
    } else {
        Bitmap defaultAlbumArt = PlayerController.getDefaultAlbumArt(context);
        imageViewAlbumArt.setBackgroundDrawable(new BitmapDrawable(Resources.getSystem(), defaultAlbumArt));
    }
    linearLayoutPlayingSong.setVisibility(View.VISIBLE);
}

public void changeButton() {
    if (PlayerController.SONG_PAUSED) {
        btnPause.setVisibility(View.GONE);
        btnPlay.setVisibility(View.VISIBLE);
    } else {
        btnPause.setVisibility(View.VISIBLE);
        btnPlay.setVisibility(View.GONE);
    }
}

public void changeUI() {
    updateUI();
    changeButton();
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu_main, menu);
    SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);

    // init menu items for search
    MenuItem itemSearchTitle = menu.findItem(R.id.action_search_title);
    MenuItem itemSearchAlbum = menu.findItem(R.id.action_search_album);
    MenuItem itemSearchArtist = menu.findItem(R.id.action_search_artist);

    SearchView searchViewTitle = (SearchView) itemSearchTitle.getActionView();
    SearchView searchViewAlbum = (SearchView) itemSearchAlbum.getActionView();
    SearchView searchViewArtist = (SearchView) itemSearchArtist.getActionView();

    searchViewTitle.setFocusable(true);
    searchViewAlbum.setFocusable(true);
    searchViewArtist.setFocusable(true);

    // init searchable info for each menu item
    searchViewTitle.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
    searchViewTitle.setQueryHint("title...");
    searchViewTitle.setIconified(true);

    searchViewAlbum.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
    searchViewAlbum.setQueryHint("album...");
    searchViewAlbum.setIconified(true);

    searchViewArtist.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
    searchViewArtist.setQueryHint("artist...");
    searchViewArtist.setIconified(true);

    // set textChangeListeners for each type of search
    final SearchView.OnQueryTextListener textChangeListenerTitle = new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextChange(String newText) {
            if (!TextUtils.isEmpty(newText)) {
                mediaFileAdapter.getFilter().filter(newText);
            }
            return true;
        }

        @Override
        public boolean onQueryTextSubmit(String query) {
            return true;
        }
    };

    SearchView.OnQueryTextListener textChangeListenerAlbum = new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextChange(String newText) {
            if (!TextUtils.isEmpty(newText)) {
                mediaFileAdapter.getFilter().filter(newText);
            }
            return true;
        }

        @Override
        public boolean onQueryTextSubmit(String query) {
            return true;
        }
    };

    SearchView.OnQueryTextListener textChangeListenerArtist = new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextChange(String newText) {
            if (!TextUtils.isEmpty(newText)) {
                mediaFileAdapter.getFilter().filter(newText);
            }
            return true;
        }

        @Override
        public boolean onQueryTextSubmit(String query) {
            return true;
        }
    };

    // apply listeners to searchViews
    searchViewTitle.setOnQueryTextListener(textChangeListenerTitle);
    searchViewAlbum.setOnQueryTextListener(textChangeListenerAlbum);
    searchViewArtist.setOnQueryTextListener(textChangeListenerArtist);

    return super.onCreateOptionsMenu(menu);

}

@Override
public boolean onOptionsItemSelected(MenuItem item) {

    int id = item.getItemId();
    // get music from specific folder
    if (id == R.id.folder_music) {
        Intent intent = new Intent(this, FolderPickerActivity.class);
        startActivityForResult(intent, PICK_FOLDER_REQUEST);
        return true;
    }
    // fetch all music from device
    if (id == R.id.all_music) {
        PlayerController.SONGS_LIST = PlayerController.listOfSongs(getApplicationContext());
        initAdapter();

        return true;
    }

    // search songs by title
    if (id == R.id.action_search_title) {
        PlayerController.SEARCH_TYPE = "TITLE";

        return true;
    }
    // search songs by artist
    if (id == R.id.action_search_artist) {
        PlayerController.SEARCH_TYPE = "ARTIST";

        return true;
    }
    // search songs by album
    if (id == R.id.action_search_album) {
        PlayerController.SEARCH_TYPE = "ALBUM";

        return true;
    }

    if (id == R.id.action_sort_title) {
        MediaFileComparator.sortByTitle(PlayerController.SONGS_LIST);
        MediaFileAdapter mediaAdapter = (MediaFileAdapter) mediaListView.getAdapter();
        mediaAdapter.notifyDataSetChanged();

        return true;
    }
    if (id == R.id.action_sort_album) {
        MediaFileComparator.sortByAlbum(PlayerController.SONGS_LIST);
        MediaFileAdapter mediaAdapter = (MediaFileAdapter) mediaListView.getAdapter();
        mediaAdapter.notifyDataSetChanged();

        return true;
    }
    if (id == R.id.action_sort_artist) {
        MediaFileComparator.sortByArtist(PlayerController.SONGS_LIST);
        MediaFileAdapter mediaAdapter = (MediaFileAdapter) mediaListView.getAdapter();
        mediaAdapter.notifyDataSetChanged();

        return true;
    }
    if (id == R.id.action_sort_duration) {
        MediaFileComparator.sortByDuration(PlayerController.SONGS_LIST);
        MediaFileAdapter mediaAdapter = (MediaFileAdapter) mediaListView.getAdapter();
        mediaAdapter.notifyDataSetChanged();

        return true;
    }
    return super.onOptionsItemSelected(item);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == RESULT_OK) {

        if (requestCode == PICK_FOLDER_REQUEST) {

            String pickedFolder = data.getStringExtra("pickedFolder");
            Log.i("PICKER_FOLDER_TAG", pickedFolder);

            // get last subfolder from path as WHERE arg
            pickedFolder = getSelectionArg(pickedFolder);
            Log.i("PICKER_FOLDER_WHERE_TAG", pickedFolder);

            // reinit music list and adapter with data from specific folder
            List<MediaFile> songsFromSpecificFolder = PlayerController.getSongsFromSpecificFolder(
                    getApplicationContext(), new String[]{pickedFolder}
            );
            if (songsFromSpecificFolder.size() != 0) {
                PlayerController.SONGS_LIST = songsFromSpecificFolder;
                PlayerController.SONG_NUMBER = 0;
                initAdapter();
            }
        }
    }
}

// receive audio action from 'Complete action with' pop-up
private void handleAudioFromOpenWithPopup() {
    // receive Intent
    Intent intent = getIntent();
    // check action
    String action = intent.getAction();
    // if it's audio action view
    if (action != null && action.equals("android.intent.action.VIEW")) {
        // play song
        PlayerController.playMusicFromActionPicker(this, intent.getData());
    }
}

// get last subfolder from path as WHERE arg
private String getSelectionArg(String path) {
    String sTag = "%";
    // substring last directory in path
    String lastSubfolder = path.substring(path.lastIndexOf("/") + 1);
    return sTag + lastSubfolder + sTag;
}

@Override
public void onMediaFileChanged() {
    changeUI();
}

@Override
public void onPlayPauseActionChanged() {
    changeButton();
}

}

我尝试过在线搜索时间，但我仍然不明白。 感谢

2 个答案:

答案 0 :(得分：0)

问题的根本原因在于某处，您的代码或代码使用的某些代码正在执行与此相同的操作：

Object[] array = new Object[0];
...
System.out.println(array[0]);

某些东西创建了一个大小为ZERO的数组（某种类型），并且它（或者其他东西）正在尝试访问该数组的第一个元素（索引零）。这超出了数组的末尾......这导致异常。

我无法看到您在代码中创建零长度数组的位置。

答案 1 :(得分：0)

你能看看方法protected void onResume()吗？

我认为，您可能会遇到以下问题：

Integer i[] = (Integer[]) msg.obj;
textBufferDuration.setText(PlayerUtils.getDuration(i[0]));
textDuration.setText(PlayerUtils.getDuration(i[1]));
seekbar.setProgress(i[2]);

首先尝试通过注释掉这些行来运行程序。在某些情况下，您的msg.obj实际上可能是一个长度为0的数组。然后您将获得java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0。希望它可以帮到你。

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