这类问题似乎在这里出现了很多，但它们与我的情况略有不同，只是让我感到困惑。我试图让我的 SeekBar 与单个指定的 mp3 同步。使用下面的代码，音频会播放，如果您移动 SeekBar，音频会搜索，但是 SeekBar 不会自行移动以随音乐更新。有人可以看看他们是否能找到阻止 SeekBar 更新的问题吗？
现已修复，但不知道为什么会修复。
这是我的固定 Java 代码。粗体的变化：
MediaPlayer mediaPlayer;
Button buttonPlayPause;
ImageView Image;
SeekBar seekBar;
Handler handler;
private int stateMediaPlayer;
private final int stateMP_NotStarter = 0;
private final int stateMP_Playing = 1;
private final int stateMP_Pausing = 2;
private int mediaPos;
private int mediaMax;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.playerwere);
Image = (ImageView) findViewById(R.id.pdfview);
Image.setImageResource(R.drawable.wereim);
seekBar = (SeekBar) findViewById(R.id.seekBar);
buttonPlayPause = (Button) findViewById(R.id.playpause);
buttonPlayPause.setOnClickListener(buttonPlayPauseOnClickListener);
seekBar.setOnSeekBarChangeListener(seekBarOnSeekChangeListener);
initMediaPlayer();
mediaPos = mediaPlayer.getCurrentPosition();
mediaMax = mediaPlayer.getDuration();
seekBar.setMax(mediaMax); // Set the Maximum range of the
// seekBar.setProgress(mediaPos);// set
// current progress to song's
seekBar.setProgress(mediaPos);// set current progress to song's
handler.removeCallbacks(moveSeekBarThread);
handler.postDelayed(moveSeekBarThread, 100);
}
private Runnable moveSeekBarThread = new Runnable() {
public void run() {
if (mediaPlayer.isPlaying()) {
int mediaPos_new = mediaPlayer.getCurrentPosition();
int mediaMax_new = mediaPlayer.getDuration();
seekBar.setMax(mediaMax_new);
seekBar.setProgress(mediaPos_new);
handler.postDelayed(this, 100); // Looping the thread after 0.1
// seconds
} **else {
int mediaPos_new = mediaPlayer.getCurrentPosition();
int mediaMax_new = mediaPlayer.getDuration();
seekBar.setMax(mediaMax_new);
seekBar.setProgress(mediaPos_new);
handler.postDelayed(this, 100); // Looping the thread after 0.1
// seconds
}**
}
};
private void initMediaPlayer() {
handler = new Handler();
mediaPlayer = new MediaPlayer();
mediaPlayer = MediaPlayer.create(were.this, R.raw.were);
stateMediaPlayer = stateMP_NotStarter;
}
Button.OnClickListener buttonPlayPauseOnClickListener = new Button.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (stateMediaPlayer) {
case stateMP_NotStarter:
mediaPlayer.start();
buttonPlayPause
.setBackgroundResource(android.R.drawable.ic_media_pause);
stateMediaPlayer = stateMP_Playing;
break;
case stateMP_Playing:
mediaPlayer.pause();
buttonPlayPause
.setBackgroundResource(android.R.drawable.ic_media_play);
stateMediaPlayer = stateMP_Pausing;
break;
case stateMP_Pausing:
mediaPlayer.start();
buttonPlayPause
.setBackgroundResource(android.R.drawable.ic_media_pause);
stateMediaPlayer = stateMP_Playing;
break;
}
}
};
SeekBar.OnSeekBarChangeListener seekBarOnSeekChangeListener = new SeekBar.OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
// TODO Auto-generated method stub
if (fromUser) {
mediaPlayer.seekTo(progress);
seekBar.setProgress(progress);
}
}
};
}