我一直在尝试在我的音频播放器应用程序中实现下一首歌曲按钮。我从教程中复制了一些代码,但它不起作用。下一首歌曲的按钮是 btnNext ,方法是 cde(), 它是代码。 单击按钮但未播放下一首歌曲,当前歌曲继续播放。我该如何解决此问题?
package com.example.dell_1.myapp3;
import android.app.Activity;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.media.MediaMetadataRetriever;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import static android.R.attr.path;
public class PlayListActivity extends Activity {
private String[] mAudioPath;
private MediaPlayer mMediaPlayer;
private String[] mMusicList;
int currentPosition = 0;
private List<String> songs = new ArrayList<>();
MediaMetadataRetriever metaRetriver;
byte[] art;
ImageView album_art;
TextView album;
TextView artist;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_play_list);
mMediaPlayer = new MediaPlayer();
ListView mListView = (ListView) findViewById(R.id.list);
mMusicList = getAudioList();
ArrayAdapter<String> mAdapter = new ArrayAdapter<>(this,
android.R.layout.simple_list_item_1, mMusicList);
mListView.setAdapter(mAdapter);
mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View view, int arg2,
long arg3) {
try {
playSong(mAudioPath[arg2]);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
private String[] getAudioList() {
final Cursor mCursor = getContentResolver().query(
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
new String[]{MediaStore.Audio.Media.DISPLAY_NAME, MediaStore.Audio.Media.DATA}, null, null,
"LOWER(" + MediaStore.Audio.Media.TITLE + ") ASC");
int count = mCursor.getCount();
String[] songs = new String[count];
mAudioPath = new String[count];
int i = 0;
if (mCursor.moveToFirst()) {
do {
songs[i] = mCursor.getString(mCursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DISPLAY_NAME));
mAudioPath[i] = mCursor.getString(mCursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA));
i++;
} while (mCursor.moveToNext());
}
mCursor.close();
return songs;
}
private void playSong(String path) throws IllegalArgumentException,
IllegalStateException, IOException {
setContentView(R.layout.activity_android_building_music_player);
Log.d("ringtone", "playSong :: " + path);
mMediaPlayer.reset();
mMediaPlayer.setDataSource(path);
//mMediaPlayer.setLooping(true);
mMediaPlayer.prepare();
mMediaPlayer.start();
acv(path);
abc();
cde();
}
public void acv(String path) {
getInit();
metaRetriver = new MediaMetadataRetriever();
metaRetriver.setDataSource(path);
try {
art = metaRetriver.getEmbeddedPicture();
Bitmap songImage = BitmapFactory.decodeByteArray(art, 0, art.length);
album_art.setImageBitmap(songImage);
album.setText(metaRetriver
.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ALBUM));
artist.setText(metaRetriver
.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ARTIST));
} catch (Exception e) {
album_art.setBackgroundColor(Color.GRAY);
album.setText("Unknown Album");
artist.setText("Unknown Artist");
}
}
public void getInit() {
album_art = (ImageView) findViewById(R.id.coverart1);
album = (TextView) findViewById(R.id.Album);
artist = (TextView) findViewById(R.id.artist_name);
}
public void abc() {
ImageButton btnPlay1 = (ImageButton) findViewById(R.id.btnPlay1);
btnPlay1.setBackgroundColor(Color.TRANSPARENT);
btnPlay1.setOnClickListener(
new View.OnClickListener() {
public void onClick(View v) {
if (mMediaPlayer.isPlaying()) {
mMediaPlayer.pause();
} else {
mMediaPlayer.start();
}
}
});
}
public void cde() {
ImageButton btnNext = (ImageButton) findViewById(R.id.btnNext); //this is the button for playing next song.
btnNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
try {
currentPosition=currentPosition+1;
playSong(path + songs.get(currentPosition));
} catch (IOException ex) {
ex.printStackTrace();
}
}
});
}
}
最佳答案
在 onCreate 方法中添加以下内容:
Bundle bundle = getIntent().getExtras();
position = bundle.getInt("position");
并将下一个按钮监听器更改为
btnNext.setOnClickListener(new View.OnClickListener() //this is the button
@Override
public void onClick(View arg0) {
if (mMediaPlayer!= null && mMediaPlayer.isPlaying()) {
mMediaPlayer.stop();
}
uri = Uri.parse(mAudioPath[position + 1]);
mMediaPlayer.setDataSource(getApplicationContext(), uri);
mMediaPlayer.prepare();
mMediaPlayer.start();
}
});
关于java - 在android音频播放器中实现下一个按钮,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45253477/