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음악 응용 프로그램을 개발 중이지만이 오류가 계속 발생합니다. 이해가되지 않고 해결 방법을 모릅니다. 나는 2 일 동안 코드를 다시 작성하려고 노력했지만 여전히 에러 팝업을 남기고있다. 내 logcat은 java.lang.IndexOutOfBoundsException처럼 나타난다. 잘못된 인덱스 0, 크기는 0이다. 그리고 주된 문제를 정교하게 적어 라.java.lang.IndexOutOfBoundsException : 잘못된 인덱스 0, 크기가 0입니다. Android 뮤직 플레이어
내가 온라인 검색을 해봤이 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();
}
}
는 시간을 varios하지만 난 아직도 이해 해달라고.
Object[] array = new Object[0];
...
System.out.println(array[0]);
뭔가 어떤 종류의 (배열을 만든 : 감사
오류의 원인은 무엇입니까? – TychoTheTaco
updateUI에서 PlayerController.SONGS_LIST.size()> 0을 확인해야합니다. – phongvan
스택 추적은 어디에 있습니까? –