Common Operations for android music players

1. [Code] variable declaration 01/* variable Declaration */02 private ImageButton playBtn = null; // play and pause 03 private ImageButton latestBtn = null; // last 04 private ImageButton nextButton = null; // next 05 private ImageButton forwardBtn = null; // fast forward to 06 private ImageButton rewindBtn = null; // fast return 07 private TextView playtime = null; // playback time 08 private TextView durationTime = null; // song time 09 private SeekBar seekbar = null; // song progress 10 private Handler handler = null; // used for the progress bar 11 private Handler fHandler = null; // used for fast forward 12 private int currentPosition; // The current playback position 2. [Code] obtain the data from the previous activity 01 @ Override02protected void onCreate (Bundle savedInstanceState) {03 super. onCreate (savedInstanceState); 04 setContentView (R. layout. play); 05 Intent intent = this. getIntent (); 06 Bundle bundle = intent. getExtras (); 07 _ ids = bundle. getIntArray ("_ ids"); // obtain the array 08 position = bundle for saving the music file _ ID. getInt ("position"); // obtain the number of the music to be played. This indicates the number of music to be played. [Code] initialize Control 1 playtime = (TextView) findViewById (R. id. playtime); // display the playback time 2 durationTime = (TextView) findViewById (R. id. duration); // display the total time of the Song 3 playBtn = (ImageButton) findViewById (R. id. playBtn); // the start and pause buttons. 4. latestBtn = (ImageButton) findViewById (R. id. latestBtn); // play the last button 5 nextButton = (ImageButton) findViewById (R. id. nextBtn); // play the next button 6 forwardBtn = (ImageButton) findViewById (R. id. forwardBtn); // fast forward button 7 rewindBtn = (ImageButton) findViewById (R. id. rewindBtn); // return button 8 seekbar = (SeekBar) findViewById (R. id. seekbar); // playback progress bar 4. [Code] define the callback function of each control to jump to [1] [2] [3] [4] [full screen Preview] 001playBtn. setOnClickListener (new View. onClickListener () {// call back 002 @ Override003 public void onClick (View v) {004 if (mp. isPlaying () {// pause 005 pause (); 006 playBtn if the player is playing. setBackgroundResource (007 R. drawable. play_selecor); // change the key status icon 008} else {// Resume playback if no playback is available 009 play (); 010 playBtn. setBackgroundResource (011 R. drawable. pause_selecor); // change the key status icon 012 013} 014} 015}); 016 017latestBtn. setOnClickListener (new View. onClickListener () {// call back 018 @ Override019 public void onClick (View v) {020 int num = _ ids when you click the "Last play" button. length; // get the number of music 021 if (position = 0) {// if it is already the first, play the last 022 position = num-1; 023} else {// otherwise, the first 024 position-= 1; 025} 026 int pos = _ ids [position]; // get the _ ID027 setup () of the music to be played; // prepare for playing 028 play (); // start playing 029} 030}); 031 032nextButton. setOnClickListener (new View. onClickListener () {// call back 033 @ Override034 public void onClick (View v) {035 int num = _ ids when you click "play next. length; // get the number of music 036 if (position = num-1) {// if it is the last one, play the first 037 position = 0; 038} else {039 position + = 1; // otherwise, play the next 040} 041 int pos = _ ids [position]; // get the _ ID042 setup () of the music to be played; // prepare for playing 043 play (); // start playing 044} 045}); 046 047forwardBtn. setOnTouchListener (new OnTouchListener () {// callback 048 @ Override049 public boolean onTouch (View v, MotionEvent event) {050 switch (event. getAction () {051 case MotionEvent. ACTION_DOWN: 052 fHandler. post (forward); // use the handler object to update the progress bar 053 mp. pause (); // when you click the fast forward button, the music stops playing 054 break; 055 056 case MotionEvent. ACTION_UP: 057 fHandler. removeCallbacks (forward); 058 mp. start (); // when the fast forward button is released, the music is temporarily resumed to play 059 playBtn. setBackgroundResource (060 R. drawable. pause_selecor); 061 break; 062} 063 return false; 064} 065}); 066 067rewindBtn. setOnTouchListener (new OnTouchListener () {// call back 068 @ Override069 public boolean onTouch (View v, MotionEvent event) {070 switch (event. getAction () {071 case MotionEvent. ACTION_DOWN: 072 fHandler. post (rewind); 073 mp. pause (); // when you click the rewind button, the music is paused for the moment 074 break; 075 076 case MotionEvent. ACTION_UP: 077 fHandler. removeCallbacks (rewind); 078 mp. start (); // when the quick return button is released, the music will resume playing 079 playBtn. setBackgroundResource (080 R. drawable. pause_selecor); 081 break; 082} 083 return false; 084} 085}); 086 087seekbar. setOnSeekBarChangeListener (new OnSeekBarChangeListener () {088 @ Override089 public void onStopTrackingTouch (SeekBar seekBar) {090 mp. start (); // when you stop dragging the progress bar, the music starts playing 091} 092 @ Override093 public void onStartTrackingTouch (SeekBar seekBar) {094 mp. pause (); // when you start dragging the progress bar, the music stops playing 095} 096 097 @ Override098 public void onProgressChanged (SeekBar seekBar, int progress, 099 boolean fromUser) {100 if (fromUser) {101 mp. seekTo (progress); // when the progress bar value changes, the music player starts playing 102} 103} 104} from the new position });