我已经实现了一个Android媒体播放器，点击歌曲文本视图将显示布局。显示播放暂停的布局..并点击播放停止效果很好。在这里，我正在考虑用户的角度来实现以下内容。
为了达到第2点，我使用了媒体播放器服务，而对于第1点，我使用了`ListView＆＃39;但没有成功实施。下面是播放歌曲并直到结束的代码。从这一点开始，有人可以帮我实现列表视图歌曲服务吗？
public class Songs extends Activity {
private MediaPlayer mediaPlayer;
public TextView songName, duration;
private double timeElapsed = 0, finalTime = 0;
private int forwardTime = 2000, backwardTime = 2000;
private Handler durationHandler = new Handler();
private SeekBar seekbar;
private Context context;
private int getCurrentPos=0;
private int[] songs={R.raw.sample_song,R.raw.sleepaway};
@Override
protected void onCreate(Bundle savedInstanceState) {
context=getApplicationContext();
super.onCreate(savedInstanceState);
setContentView(R.layout.mediaplayer);
initializeViews();
}
public void initializeViews(){
songName = (TextView) findViewById(R.id.songName);
mediaPlayer = MediaPlayer.create(this, songs[getCurrentPos]);
mediaPlayer.setLooping(true);
finalTime = mediaPlayer.getDuration();
duration = (TextView) findViewById(R.id.songDuration);
seekbar = (SeekBar) findViewById(R.id.seekBar);
songName.setText("Sample_Song.mp3");
seekbar.setMax((int) finalTime);
seekbar.setClickable(false);
}
// play mp3 song
public void play(View view) {
mediaPlayer.start();
timeElapsed = mediaPlayer.getCurrentPosition();
seekbar.setProgress((int) timeElapsed);
durationHandler.postDelayed(updateSeekBarTime, 100);
}
private Runnable updateSeekBarTime = new Runnable() {
public void run() {
//get current position
timeElapsed = mediaPlayer.getCurrentPosition();
//set seekbar progress
seekbar.setProgress((int) timeElapsed);
//set time remaing
double timeRemaining = finalTime - timeElapsed;
// duration.setText(String.format("%d min, %d sec", 12, TimeUnit.MILLISECONDS.toSeconds((long) timeRemaining) - 12));
//repeat yourself that again in 100 miliseconds
durationHandler.postDelayed(this, 100);
}
};
// pause mp3 song
public void pause(View view) {
mediaPlayer.pause();
}
// go forward at forwardTime seconds
public void forward(View view) {
//check if we can go forward at forwardTime seconds before song endes
if ((timeElapsed + forwardTime) <= finalTime) {
timeElapsed = timeElapsed + forwardTime;
//seek to the exact second of the track
mediaPlayer.seekTo((int) timeElapsed);
}
}
// go backwards at backwardTime seconds
public void rewind(View view) {
//check if we can go back at backwardTime seconds after song starts
if ((timeElapsed - backwardTime) > 0) {
timeElapsed = timeElapsed - backwardTime;
//seek to the exact second of the track
mediaPlayer.seekTo((int) timeElapsed);
}
}
// Go to next song
public void next(View view) throws IOException{
try {
mediaPlayer.reset();
mediaPlayer = MediaPlayer.create(this, songs[getSongPosition()]);
mediaPlayer.start();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private int getSongPosition(){
if(getCurrentPos==songs.length-1){
getCurrentPos=0;
}else if(getCurrentPos==0){
getCurrentPos=getCurrentPos+1;
}else{
getCurrentPos=getCurrentPos+1;
}
return getCurrentPos;
}
}
布局：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:background="#333333"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin" >
<TextView
android:id="@+id/songName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="songName" />
<ImageView
android:id="@+id/mp3Image"
android:layout_width="match_parent"
android:layout_height="200dp"
android:padding="30dp"
android:src="@drawable/music"
android:background="#ffffff"
android:layout_margin="30dp" />
<TextView
android:id="@+id/songDuration"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="songDuration" />
<SeekBar
android:id="@+id/seekBar"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="30dp"
android:gravity="center_horizontal"
android:orientation="horizontal" >
<ImageButton
android:id="@+id/media_rew"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="7dp"
android:onClick="rewind"
android:src="@android:drawable/ic_media_rew" />
<ImageButton
android:id="@+id/media_pause"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="7dp"
android:onClick="pause"
android:src="@android:drawable/ic_media_pause" />
<ImageButton
android:id="@+id/media_play"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="7dp"
android:onClick="play"
android:src="@android:drawable/ic_media_play" />
<ImageButton
android:id="@+id/media_ff"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="7dp"
android:onClick="forward"
android:src="@android:drawable/ic_media_ff" />
<ImageButton
android:id="@+id/media_next"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="7dp"
android:onClick="next"
android:src="@android:drawable/ic_media_next" />
</LinearLayout>
</LinearLayout>