Java 我的MediaPlayer在手机进入睡眠状态大约20秒后停止播放
我的Java 我的MediaPlayer在手机进入睡眠状态大约20秒后停止播放,java,android,android-mediaplayer,Java,Android,Android Mediaplayer,我的MediaPlayer在手机进入睡眠状态大约20到30秒后停止播放。我失败的尝试低于预先感谢 MediaPlayer mediaPlayer = new MediaPlayer(); SeekBar seekBar; boolean wasPlaying = false; ImageButton fab; @Override protected void onCreate(Bundle savedInstanceState) {
MediaPlayer
在手机进入睡眠状态大约20到30秒后停止播放。我失败的尝试低于预先感谢
MediaPlayer mediaPlayer = new MediaPlayer();
SeekBar seekBar;
boolean wasPlaying = false;
ImageButton fab;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_mediaplayer);
fab = findViewById(R.id.imageButton);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
playSong();
}
});
final TextView seekBarHint = findViewById(R.id.textView);
seekBar = findViewById(R.id.seekbar);
seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
seekBarHint.setVisibility(View.VISIBLE);
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch) {
seekBarHint.setVisibility(View.VISIBLE);
int x = (int) Math.ceil(progress / 1000f);
if (x < 10)
seekBarHint.setText("0:0" + x);
else
seekBarHint.setText("0:" + x);
double percent = progress / (double) seekBar.getMax();
int offset = seekBar.getThumbOffset();
int seekWidth = seekBar.getWidth();
int val = (int) Math.round(percent * (seekWidth - 2 * offset));
int labelWidth = seekBarHint.getWidth();
seekBarHint.setX(offset + seekBar.getX() + val
- Math.round(percent * offset)
- Math.round(percent * labelWidth / 2));
if (progress > 0 && mediaPlayer != null && !mediaPlayer.isPlaying()) {
clearMediaPlayer();
fab.setImageDrawable(ContextCompat.getDrawable(MediaPlayerActivity.this, android.R.drawable.ic_media_play));
MediaPlayerActivity.this.seekBar.setProgress(0);
}
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
if (mediaPlayer != null && mediaPlayer.isPlaying()) {
mediaPlayer.seekTo(seekBar.getProgress());
}
}
});
}
public void playSong() {
try {
if (mediaPlayer != null && mediaPlayer.isPlaying()) {
clearMediaPlayer();
seekBar.setProgress(0);
wasPlaying = true;
fab.setImageDrawable(ContextCompat.getDrawable(MediaPlayerActivity.this, android.R.drawable.ic_media_play));
}
if (!wasPlaying) {
if (mediaPlayer == null) {
mediaPlayer = new MediaPlayer();
}
fab.setImageDrawable(ContextCompat.getDrawable(MediaPlayerActivity.this, android.R.drawable.ic_media_pause));
Intent intent = getIntent();
String user_name = intent.getStringExtra("USER_NAME");
String file = intent.getStringExtra("FILE_NAME");
TextView Namee = findViewById(R.id.textView3);
Namee.setText(file);
mediaPlayer.setDataSource(user_name);
mediaPlayer.prepare();
mediaPlayer.setVolume(0.5f, 0.5f);
mediaPlayer.setLooping(false);
seekBar.setMax(mediaPlayer.getDuration());
mediaPlayer.start();
new Thread(this).start();
}
wasPlaying = false;
} catch (Exception e) {
e.printStackTrace();
}
}
public void run() {
int currentPosition = mediaPlayer.getCurrentPosition();
int total = mediaPlayer.getDuration();
while (mediaPlayer != null && mediaPlayer.isPlaying() && currentPosition < total) {
try {
Thread.sleep(1000);
currentPosition = mediaPlayer.getCurrentPosition();
} catch (InterruptedException e) {
return;
} catch (Exception e) {
return;
}
seekBar.setProgress(currentPosition);
}
}
@Override
protected void onDestroy() {
super.onDestroy();
clearMediaPlayer();
}
private void clearMediaPlayer() {
mediaPlayer.stop();
mediaPlayer.release();
mediaPlayer = null;
}
}
MediaPlayer=newmediaplayer();
SeekBar-SeekBar;
布尔值=false;
图像按钮厂;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_mediaplayer);
fab=findViewById(R.id.imageButton);
fab.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图){
播放歌曲();
}
});
最终文本视图seekBarHint=findviewbyd(R.id.TextView);
seekBar=findViewById(R.id.seekBar);
seekBar.setOnSeekbarchaneListener(新的seekBar.onSeekbarchaneListener(){
@凌驾
开始跟踪触摸时的公共无效(SeekBar SeekBar){
seekBarHint.setVisibility(View.VISIBLE);
}
@凌驾
public void onProgressChanged(SeekBar-SeekBar、int-progress、boolean-fromTouch){
seekBarHint.setVisibility(View.VISIBLE);
int x=(int)Math.ceil(progress/1000f);
if(x<10)
seekBarHint.setText(“0:0”+x);
其他的
seekBarHint.setText(“0:+x”);
双百分比=进度/(双)seekBar.getMax();
int offset=seekBar.getThumbOffset();
int seekWidth=seekBar.getWidth();
int val=(int)数学四舍五入(百分比*(见宽度-2*偏移量));
int-labelWidth=seekBarHint.getWidth();
seekBarHint.setX(偏移量+seekBar.getX()+val
-数学四舍五入(百分比*偏移)
-数学四舍五入(百分比*标签宽度/2);
if(progress>0&&mediaPlayer!=null&&mediaPlayer.isPlaying()){
clearMediaPlayer();
fab.setImageDrawable(ContextCompat.getDrawable(MediaPlayerActivity.this,android.R.drawable.ic_media_play));
MediaPlayerActivity.this.seekBar.setProgress(0);
}
}
@凌驾
TopTrackingTouch(SeekBar SeekBar)上的公共无效{
if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
mediaPlayer.seekTo(seekBar.getProgress());
}
}
});
}
公开播放歌曲(){
试一试{
if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
clearMediaPlayer();
seekBar.setProgress(0);
wasPlaying=true;
fab.setImageDrawable(ContextCompat.getDrawable(MediaPlayerActivity.this,android.R.drawable.ic_media_play));
}
如果(!在玩){
如果(mediaPlayer==null){
mediaPlayer=新的mediaPlayer();
}
fab.setImageDrawable(ContextCompat.getDrawable(MediaPlayerActivity.this,android.R.drawable.ic_media_pause));
Intent=getIntent();
字符串user\u name=intent.getStringExtra(“用户名”);
String file=intent.getStringExtra(“文件名”);
TextView name=findViewById(R.id.textView3);
Namee.setText(文件);
mediaPlayer.setDataSource(用户名);
mediaPlayer.prepare();
mediaPlayer.setVolume(0.5f,0.5f);
mediaPlayer.setLooping(false);
seekBar.setMax(mediaPlayer.getDuration());
mediaPlayer.start();
新线程(this.start();
}
在玩=假;
}捕获(例外e){
e、 printStackTrace();
}
}
公开募捐{
int currentPosition=mediaPlayer.getCurrentPosition();
int total=mediaPlayer.getDuration();
while(mediaPlayer!=null&&mediaPlayer.isPlaying()&¤tPosition
出现此问题的原因是,当您的手机处于休眠状态时,您的活动会在一定时间后基于可用ram和其他内存被破坏
关键是,对于长时间运行的任务(如音乐播放),活动不是选项。活动主要是,仅用于需要用户关注、交互且不在后台无限时间运行的任务
音乐播放器和长时间运行的作业需要使用服务,该服务将无限期运行,直到用户或操作系统将其销毁
来自谷歌关于服务
服务是一个可以在后台执行长期运行操作的应用程序组件,它不提供用户界面。另一个应用程序组件可以启动服务,即使用户切换到另一个应用程序,它也会继续在后台运行。此外,组件可以绑定到服务以与其交互,甚至可以执行进程间通信(IPC)。例如,服务可以在后台处理网络事务、播放音乐、执行文件I/O或与内容提供商交互
具体来说,对于音乐应用程序,您需要前台服务
前台服务执行一些用户可以注意到的操作