我正在创建一个媒体播放器服务来播放来自互联网的媒体文件，如下所示：
public class MyService extends Service{
private static final String TAG = "MyService";
MediaPlayer mediaPlayer;
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
Toast.makeText(this, "My Service Created", Toast.LENGTH_LONG).show();
Log.d(TAG, "onCreate");
mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
}
@Override
public void onDestroy() {
Toast.makeText(this, "My Service Stopped", Toast.LENGTH_LONG).show();
Log.d(TAG, "onDestroy");
mediaPlayer.stop();
}
@Override
public void onStart(Intent intent, int startid) {
Toast.makeText(this, "My Service Started", Toast.LENGTH_LONG).show();
Log.d(TAG, "onStart");
String rtsp;
Bundle re= intent.getExtras();
rtsp=re.getString("rtsp");
try {
mediaPlayer.setDataSource(rtsp);
mediaPlayer.prepare();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mediaPlayer.start();
}
}
现在我想从这样的活动中获取搜索栏：
SeekBar seekbar= (SeekBar)findviewbyid(R.id.seekbar);
但我不能:(请帮我怎么做！
修改
我找到了另一种方法来解决我的问题而不使用Bind服务:) 这是：
在您的服务类中，创建一个这样的静态方法：
public static void setMainActivity(Player_Activity mainActivity)
{
MAIN_ACTIVITY=mainActivity;
}
当然，你必须声明一个静态变量：
private static Player_Activity MAIN_ACTIVITY;
接下来，在您的活动中，在调用startService（）之前，您必须调用此方法将主要活动设置为您的服务，如下所示：
MyService.setMainActivity(Player_Activity.this);
Intent myservice= new Intent(this,MyService.class);
startService(myservice);
最后，您可以在服务中对此进行任何操作，如下所示：
final TextView tv_test=(TextView)MAIN_ACTIVITY.findViewById(R.id.textview);
这就是全部！希望这有帮助：）
如果我对英语有误，请原谅我;），我的英语技能不好：）
答案 0 :(得分：1)
答案 1 :(得分：1)
我知道它已经回答了。但我尝试了下面的代码，它对我有用。可能对某人有用。
public class MediaPlayerService extends Service implements MediaPlayer.OnPreparedListener,MediaPlayer.OnCompletionListener{
String ExactPath;
int total,CurrentPosition;
MediaPlayer mp;
private final IBinder mBinder=new LocalBinder();
public class LocalBinder extends Binder {
MediaPlayerService getService(){
return MediaPlayerService.this;
}
}
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
@Override
public void onCreate() {
mp=new MediaPlayer();
mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
mp.setOnPreparedListener(this);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
ExactPath=intent.getStringExtra("pos");
PrepareMediaPlayer();
if(!mp.isPlaying()){
mp.start();
}else{
mp.pause();
}
return START_STICKY;
}
public void PrepareMediaPlayer(){
try {
mp.setDataSource(ExactPath);
mp.prepareAsync();
} catch (IOException e) {
e.printStackTrace();
}catch (IllegalStateException e){ }
catch(IllegalFormatException e){ }
}
@Override
public void onPrepared(MediaPlayer mediaPlayer) {
mp.start();
}
@Override
public void onCompletion(MediaPlayer mediaPlayer) {
stopSelf();
}
public int seekBarGetCurrentPosition(){ //This method is created to get SongCurrentPosition from mediaplayer for seekbar
if(mp!=null&&mp.isPlaying()){
CurrentPosition=mp.getCurrentPosition();
}
return CurrentPosition;
}
@Override
public void onDestroy() {
if(mp.isPlaying()){
mp.stop();
}
mp.release();
}
}
注意：在服务类中，我在获取MediaPlayer持续时间时遇到了问题。当我的活动从服务请求持续时间时，我得不到正确的结果。所以我已经实现了一种从活动中获得持续时间的方法。希望你能在服务本身确定持续时间。但这段代码对我有用。
然后在你的Activity中，在onCreate（）方法之后。
/**The below method songDuration() is created as substitution for getMediaPlayerDuration() method
* if getMediaPlayerDuration() failed to get the duration from mediaPlayer via service this method
* helps to avoid returning zero or null value . Because it has been observed that service takes
* quite a long time to return a value, if it is called frequently with in a span of seconds say, pressing
* Next button continuously.
*/
public int songDuration(){
MediaMetadataRetriever mmr=new MediaMetadataRetriever();
mmr.setDataSource(path);
String Dur=mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION);
Integer Duration=Integer.parseInt(Dur);
return Duration;
}
@Override
protected void onStart() {
super.onStart();
Intent intent=new Intent(Player.this,MediaPlayerService.class);
bindService(intent,mServiceConnection, Context.BIND_AUTO_CREATE);
getSeekBarStatus();//This method is called onBinding process so that it gets updated with player.
}
@Override
protected void onStop() {
super.onStop();
if(ServiceBinding){
unbindService(mServiceConnection);
ServiceBinding=false;
}
}
//This method gets the MediaPlayer Duration from service.
public int getMediaPlayerDuration(){
if(ServiceBinding){
if(mediaPlayerServiceObject.mp!=null){
Duration=mediaPlayerServiceObject.seekBarDuration();
}
}
return Duration;
}
//This method get MediaPlayerCurrent Position from service
public int getMediaPlayerCurrentPosition(){
if(ServiceBinding){
if(mediaPlayerServiceObject.mp!=null){
currentPosition=mediaPlayerServiceObject.seekBarGetCurrentPosition();
}
}
return currentPosition;
}
//This method is used to update seekBar status by getting Player Current Position from service.
public void getSeekBarStatus(){
new Thread(new Runnable() {
@Override
public void run() {
int total=songDuration();
int CurrentPosition=0;
seekBar.setMax(total);
while(CurrentPosition<total){
try {
Thread.sleep(1000);
CurrentPosition=getMediaPlayerCurrentPosition();
Log.d(TAG,String.valueOf(CurrentPosition));
} catch (InterruptedException e) {
return;
}seekBar.setProgress(CurrentPosition);
}
}
}).start();
seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(final SeekBar seekBar, int ProgressValue, boolean fromUser) {
// if(fromUser){
// mp.seekTo(ProgressValue);
//}
final long Minutes=((ProgressValue/1000)/60);
final int Seconds=((ProgressValue/1000)%60);
SongProgress.setText(Minutes+":"+Seconds);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
}
private ServiceConnection mServiceConnection=new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
MediaPlayerService.LocalBinder binder=(MediaPlayerService.LocalBinder)iBinder;
mediaPlayerServiceObject=binder.getService();
ServiceBinding=true;
getSeekBarStatus();
}
@Override
public void onServiceDisconnected(ComponentName componentName) {
stopService(PlayerServiceIntent);
onStop();
ServiceBinding=false;
}
};