Android mediaplayer: playing music and implementing progress bars

First, we read the file from the SD card to play the file !!

1 ,:

Work in advance and put music files into the SD card,

2. layout file main. xml

<? XML version = "1.0" encoding = "UTF-8"?> <Linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android" Android: layout_width = "fill_parent" Android: layout_height = "fill_parent" Android: Orientation = "vertical"> <textview Android: layout_width = "wrap_content" Android: layout_height = "wrap_content" Android: text = "song name:"/> <textview Android: layout_width = "wrap_content" Android: layout_height = "wrap_content" Android: TEXT = "blueflawer.pdf"/> <button Android: layout_width = "wrap_content" Android: layout_height = "wrap_content" Android: text = "play" Android: id = "@ + ID/play_pause"/> <button Android: layout_width = "wrap_content" Android: layout_height = "wrap_content" Android: text = "reset" Android: id = "@ + ID/RESET"/> <seekbar Android: layout_width = "fill_parent" Android: layout_height = "wrap_content" Android: id = "@ + ID/seekbar"/> </linearlayout>

3. Activity

Package CN. csdn. activity; import Java. io. file; import Java. io. ioexception; import Java. util. timer; import Java. util. timertask; import android. app. activity; import android. media. mediaplayer; import android. OS. bundle; import android. OS. environment; import android. view. view; import android. view. view. onclicklistener; import android. widget. button; import android. widget. seekbar; import android. widget. seekbar. onseekba Rchangelistener; public class myplayeractivity extends activity {private button play_pause, reset; private seekbar; private Boolean ifplay = false; private mediaplayer player = NULL; private string musicname = "blueflawer.mp3 "; private Boolean iffirst = false; private timer mtimer; private timertask mtimertask; private Boolean ischanging = false; // mutex variable to prevent degree conflict between the timer and seekbar when dragging. Public void oncreate (Bund Le savedinstancestate) {super. oncreate (savedinstancestate); setcontentview (R. layout. main); player = new mediaplayer (); findviews (); // each component} private void findviews () {play_pause = (button) findviewbyid (R. id. play_pause); reset = (button) findviewbyid (R. id. reset); play_pause.setonclicklistener (New myclick (); reset. setonclicklistener (New myclick (); seekbar = (seekbar) findviewbyid (R. id. seekbar); seekbar. seton Seekbarchangelistener (New myseekbar ();} class myclick implements onclicklistener {public void onclick (view v) {file = new file (environment. getexternalstoragedirectory (), musicname); // If (file. exists () {Switch (v. GETID () {case R. id. play_pause: If (player! = NULL &&! Ifplay) {play_pause.settext ("pause"); If (! Iffirst) {player. reset (); try {player. setdatasource (file. getabsolutepath (); player. prepare (); // prepare} catch (illegalargumentexception e) {e. printstacktrace ();} catch (illegalstateexception e) {e. printstacktrace ();} catch (ioexception e) {e. printstacktrace ();} seekbar. setmax (player. getduration (); // set the progress bar // ---------- the timer records the playback progress --------- // mtimer = new timer (); mtimertask = new timertask () {@ override publi C void run () {If (ischanging = true) {return;} seekbar. setprogress (player. getcurrentposition () ;}}; mtimer. schedule (mtimertask, 0, 10); iffirst = true;} player. start (); // start ifplay = true;} else if (ifplay) {play_pause.settext ("continue"); player. pause (); ifplay = false;} break; case R. id. reset: If (ifplay) {player. seekto (0);} else {player. reset (); try {player. setdatasource (file. getabsolutepath (); player. prepa Re (); // prepare player. start (); // start} catch (illegalargumentexception e) {e. printstacktrace ();} catch (illegalstateexception e) {e. printstacktrace ();} catch (ioexception e) {e. printstacktrace () ;}} break ;}}// progress bar processing class myseekbar implements onseekbarchangelistener {public void onprogresschanged (seekbar, int progress, Boolean fromuser) {} public void onstarttrackingtouch (seekbar) {ischanging = True;} public void onstoptrackingtouch (seekbar) {player. seekto (seekbar. getprogress (); ischanging = false ;}// call processing protected void ondestroy () {If (player! = NULL) {If (player. isplaying () {player. stop ();} player. release ();} super. ondestroy ();} protected void onpause () {If (player! = NULL) {If (player. isplaying () {player. Pause () ;}} super. onpause () ;} protected void onresume () {If (player! = NULL) {If (! Player. isplaying () {player. Start () ;}} super. onresume ();}}