我正在尝试让媒体播放器播放音乐。但是在播放3-4首歌后它停止了。并给出以下错误。
我正好在current = mp.getCurrentPosition();收到错误
我的代码是：
public class player extends AppCompatActivity implements View.OnClickListener {
ArrayList<File> mysong;
static MediaPlayer mp;
SeekBar sb;
int position;
Uri u;
TextView tv;
Thread updateseek;
Button btplay, btFF, btBB, btnext, btpreviout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_player);
sb = (SeekBar) findViewById(R.id.seekBar);
btplay = (Button) findViewById(R.id.button);
btFF = (Button) findViewById(R.id.button3);
btBB = (Button) findViewById(R.id.button2);
btnext = (Button) findViewById(R.id.button5);
btpreviout = (Button) findViewById(R.id.button4);
tv = (TextView)findViewById(R.id.textView2);
tv.setVisibility(View.INVISIBLE);
btpreviout.setOnClickListener(this);
btnext.setOnClickListener(this);
btBB.setOnClickListener(this);
btFF.setOnClickListener(this);
btplay.setOnClickListener(this);
if (mp != null) {
mp.stop();
mp.release();
}
updateseek = new Thread(){
@Override
public void run() {
int total = mp.getDuration();
int current = 0;
sb.setMax(total);
while(current < total){
try {
sleep(500);
current = mp.getCurrentPosition();
sb.setProgress(current);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
super.run();
}
};
Intent i = getIntent();
Bundle b = i.getExtras();
mysong = (ArrayList) b.getParcelableArrayList("mysonglist");
position = b.getInt("pos", 0);
u = Uri.parse(mysong.get(position).toString());
mp = MediaPlayer.create(getApplicationContext(), u);
mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
mp.start();
sb.setMax(mp.getDuration());
updateseek.start();
mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
mp.release();
}
});
sb.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
if(sb.getProgress()>(mp.getDuration()/2)){
tv.setVisibility(View.VISIBLE);
}else tv.setVisibility(View.INVISIBLE);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
btplay.setText("p");
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
mp.seekTo(seekBar.getProgress());
}
});
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.button:
if (mp.isPlaying()) {
mp.pause();
} else mp.start();
break;
case R.id.button2:
mp.seekTo(mp.getCurrentPosition() - 5000);
break;
case R.id.button3:
mp.seekTo(mp.getCurrentPosition() + 5000);
break;
case R.id.button4:
mp.stop();
mp.release();
position = (position - 1 < 0) ? mysong.size() - 1 : (position - 1) % mysong.size();
u = Uri.parse(mysong.get(position).toString());
mp = MediaPlayer.create(getApplicationContext(), u);
sb.setProgress(0);
mp.start();
sb.setMax(mp.getDuration());
break;
case R.id.button5:
mp.stop();
mp.release();
position = (position + 1) % mysong.size();
u = Uri.parse(mysong.get(position).toString());
mp = MediaPlayer.create(getApplicationContext(), u);
sb.setProgress(0);
mp.start();
sb.setMax(mp.getDuration());
break;
}
}
}
我的日志猫在这里：
12-18 18：04：37.483 4846-4846 / com.bucketlist.dell.musicplayer W / Resources：转换为字符串：TypedValue {t = 0x12 / d = 0x0 a = 3 r = 0x7f0c0057} 12-18 18：04：37.483 4846-4846 / com.bucketlist.dell.musicplayer W / Resources：转换为 string：TypedValue {t = 0x12 / d = 0x0 a = 3 r = 0x7f0c0058} 12-18 18：04：37.493 4846-4846 / com.bucketlist.dell.musicplayer W / Resources：转换为 string：TypedValue {t = 0x12 / d = 0x0 a = 3 r = 0x7f0c0072} 12-18 18：04：37.493 4846-4846 / com.bucketlist.dell.musicplayer W / Resources：转换为 string：TypedValue {t = 0x12 / d = 0x0 a = 3 r = 0x7f0c0073} 12-18 18：04：37.493 4846-4846 / com.bucketlist.dell.musicplayer D / AbsSeekBar：AbsSeekBar 构造函数：mAllowedSeeBarAnimation = false 12-18 18：04：37.503 4846-4846 / com.bucketlist.dell.musicplayer W / Resources：转换为 string：TypedValue {t = 0x12 / d = 0x0 a = 3 r = 0x7f0c0074} 12-18 18：04：37.503 4846-4846 / com.bucketlist.dell.musicplayer W / Resources：转换为 string：TypedValue {t = 0x12 / d = 0x0 a = 3 r = 0x7f0c0075} 12-18 18：04：37.503 4846-4846 / com.bucketlist.dell.musicplayer W / Resources：转换为 string：TypedValue {t = 0x12 / d = 0x0 a = 3 r = 0x7f0c0076} 12-18 18：04：37.513 4846-4846 / com.bucketlist.dell.musicplayer W / Resources：转换为 string：TypedValue {t = 0x12 / d = 0x0 a = 3 r = 0x7f0c0077} 12-18 18：04：37.513 4846-4846 / com.bucketlist.dell.musicplayer W / Resources：转换为 string：TypedValue {t = 0x12 / d = 0x0 a = 3 r = 0x7f0c0078} 12-18 18：04：37.513 4846-4846 / com.bucketlist.dell.musicplayer W / Resources：转换为 string：TypedValue {t = 0x12 / d = 0x0 a = 3 r = 0x7f0c0079} 12-18 18：04：37.513 4846-4846 / com.bucketlist.dell.musicplayer I / MediaPlayer：sendBroadcast CONTEXT_AWARE_MUSIC_INFO - 类型（停止） - id（573）12-18 18：04：37.633 4846-4846 / com.bucketlist.dell.musicplayer E / MediaPlayer-JNI： QCMediaPlayer媒体播放器不存在12-18 18：04：37.693 4846-4856 / com.bucketlist.dell.musicplayer W / MediaPlayer：info / warning （973,0）12-18 18：04：37.703 4846-5528 / com.bucketlist.dell.musicplayer E / AndroidRuntime：致命异常：Thread-26716 过程：com.bucketlist.dell.musicplayer，PID：4846 java.lang.IllegalStateException 在android.media.MediaPlayer.getCurrentPosition（Native方法） 在com.bucketlist.dell.musicplayer.player $ 1.run（player.java:65）12-18 18：04：37.703 4846-4846 / com.bucketlist.dell.musicplayer E / MediaPlayer： 应该有字幕控制器已设置12-18 18：04：37.813 4846-4846 / com.bucketlist.dell.musicplayer D / PhoneWindow： FMB isFloatingMenuEnabled mFloatingMenuBtn：null 12-18 18：04：37.813 4846-4846 / com.bucketlist.dell.musicplayer D / PhoneWindow： FMB isFloatingMenuEnabled返回false 12-18 18：04：37.843 4846-4846 / com.bucketlist.dell.musicplayer D / SRIB_DCS：log_dcs 输入了ThreadedRenderer :: initialize！ 12-18 18：04：37.863 4846-4846 / com.bucketlist.dell.musicplayer I / MediaPlayer：不要发送 意图。 msg.arg1 = 0，msg.arg2 = 0 12-18 18：04：37.863 4846-4846 / com.bucketlist.dell.musicplayer E / MediaPlayer：应该有 字幕控制器已设置12-18 18：04：37.883 4846-4846 / com.bucketlist.dell.musicplayer I / MediaPlayer：发送上下文 意识到事件12-18 18：04：37.893 4846-4846 / com.bucketlist.dell.musicplayer I / MediaPlayer：sendBroadcast CONTEXT_AWARE_MUSIC_INFO - 类型（开始） - id（574）12-18 18：04：39.623 4846-5528 / com.bucketlist.dell.musicplayer I / Process：发送信号。 PID：4846 SIG：9
12-18 18：04：37.633 4846-4846 / com.bucketlist.dell.musicplayer E / MediaPlayer-JNI：QCMediaPlayer媒体播放器不存在12-18 18：04：37.693 4846-4856 / com.bucketlist.dell.musicplayer W / MediaPlayer： info / warning（973,0）12-18 18：04：37.703 4846-5528 / com.bucketlist.dell.musicplayer E / AndroidRuntime：致命 例外：Thread-26716 过程：com.bucketlist.dell.musicplayer，PID：4846 java.lang.IllegalStateException 在android.media.MediaPlayer.getCurrentPosition（Native方法） 在com.bucketlist.dell.musicplayer.player $ 1.run（player.java:65）12-18 18：04：37.703 4846-4846 / com.bucketlist.dell.musicplayer E / MediaPlayer： 应该已经设置了字幕控制器
答案 0 :(得分：0)
在开发音乐播放器时，我遇到了同样的异常，问题的根本原因是从错误的状态调用mp.getCurrentPosition（）。
你从oncreate开始直接更新并且它连续运行，如果一首歌完成并且你正在尝试播放当时媒体播放器处于停止状态的下一首歌，那时你尝试调用getCurrentPosition它会触发异常。
因此在调用mp.getCurrentPosition（）之前添加一个if条件（mp.isPlaying）并确保在调用getCurrentPosition（）时播放该歌曲。