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POandroid, song controller and seek bar in media player
 

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  1. POandroid, song controller and seek bar in media player
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    <p>in my music player how I can let my seek bar back to the starting point after I clicked stop button? and set the text field of total duration and current position to zero ?? the problem happen when I click stop and then click play button ?in my log cat the error is "Attempt to call getDuration without a valid mediaplayer"</p> <pre><code>@Override protected void onCreate(Bundle savedInstanceState) { setVolumeControlStream(AudioManager.STREAM_MUSIC); super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ImageButton play_btn= (ImageButton) findViewById(R.id.iv_play); ImageButton backward_btn=(ImageButton)findViewById(R.id.imageView_backward); ImageButton forward_btn= (ImageButton) findViewById(R.id.imageView_forward); ImageButton stop_btn= (ImageButton) findViewById(R.id.imageView_stop); ImageButton pause_btn= (ImageButton)findViewById(R.id.imageView_pause); ImageButton shuffle_btn = (ImageButton) findViewById(R.id.imageView_shuffle); song = MediaPlayer.create(getApplicationContext() ,R.raw.adele); songProgressBar= (SeekBar) findViewById(R.id.seekBar1); songProgressBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { @Override public void onStopTrackingTouch(SeekBar seekBar) { // TODO Auto-generated method stub mHandler.removeCallbacks(mUpdateTimeTask); int totalDuration = song.getDuration(); int currentPosition = utils.progressToTimer(seekBar.getProgress(), totalDuration); song.seekTo(currentPosition); UpdateProgressBar(); } @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 } }); pause_btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub PauseSong(); } private void PauseSong() { // TODO Auto-generated method stub song.pause(); } }); stop_btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub StopSong(); } private void StopSong() { // TODO Auto-generated method stub song.stop(); } }); play_btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { PlaySong(); } private void PlaySong() { // TODO Auto-generated method stub song.start(); songProgressBar.setProgress(0); songProgressBar.setMax(100); UpdateProgressBar(); } }); } private void UpdateProgressBar() { // TODO Auto-generated method stub mHandler.postDelayed(mUpdateTimeTask, 100); } Runnable mUpdateTimeTask = new Runnable() { @Override public void run() { // TODO Auto-generated method stub totalDuration = song.getDuration(); currentDuration = song.getCurrentPosition(); // Displaying Total Duration time songTotalDurationLabel = (TextView)findViewById(R.id.songTotalDurationLabel); songTotalDurationLabel.setText(""+utils.milliSecondsToTimer(totalDuration)); // Displaying time completed playing songCurrentDurationLabel = (TextView)findViewById(R.id.songCurrentDurationLabel); songCurrentDurationLabel.setText(""+utils.milliSecondsToTimer(currentDuration)); // Updating progress bar int progress = (int)(utils.getProgressPercentage(currentDuration, totalDuration)); Log.d("Progress", ""+progress); songProgressBar.setProgress(progress); // Running this thread after 100 milliseconds mHandler.postDelayed(this, 100); } }; protected void onPause() {finish();} @Override protected void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); finish(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } </code></pre> <p>}</p>
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