Android music player.

Package com. king. android. media;

Import java. io. File;
Import java. io. FilenameFilter;
Import java. util. ArrayList;
Import java. util. List;

Import android. app. Activity;
Import android. media. MediaPlayer;
Import android. media. MediaPlayer. OnCompletionListener;
Import android. OS. Bundle;
Import android. OS. Environment;
Import android. view. View;
Import android. view. View. OnClickListener;
Import android. widget. Button;
Import android. widget. Toast;

Import com. king. android. R;

Public class MusicBActivity extends Activity implements OnClickListener {
Public static final String TAG = "MusicActivity ";
Static List <File> allFiles = new ArrayList <File> ();
Private int mCurrentJMusic = 0; // The current music.
Private MediaPlayer mMediaPlayer = null;
@ Override
Protected void onCreate (Bundle savedInstanceState ){
Super. onCreate (savedInstanceState );
RefreshFile (getSDCardPath (), ". mp3 ");
If (allFiles. size () <= 0 ){
Toast. makeText (MusicBActivity. this, "no songs", Toast. LENGTH_SHORT). show ();
Finish ();
}
MMediaPlayer = new MediaPlayer ();
InitView ();
}

Public String getSDCardPath (){
String sdPath = null;
Boolean hasCard = Environment. getExternalStorageState (). equals (Environment. MEDIA_MOUNTED );
If (hasCard ){
SdPath = Environment. getExternalStorageDirectory (). toString ();
} Else {
SdPath = Environment. getDataDirectory (). toString ();
}
Return sdPath;
}
Private void initView (){
SetContentView (R. layout. media_layout );

Button btnMedia = (Button) findViewById (R. id. btn_last );
BtnMedia. setOnClickListener (this );

BtnMedia = (Button) findViewById (R. id. btn_pause );
BtnMedia. setOnClickListener (this );

BtnMedia = (Button) findViewById (R. id. btn_stop );
BtnMedia. setOnClickListener (this );

BtnMedia = (Button) findViewById (R. id. btn_play );
BtnMedia. setOnClickListener (this );

BtnMedia = (Button) findViewById (R. id. btn_next );
BtnMedia. setOnClickListener (this );

}

@ Override
Public void onClick (View v ){
Switch (v. getId ()){
Case R. id. btn_play:
PlayMusic (allFiles. get (mCurrentJMusic ));
Break;

Case R. id. btn_next:
NextMusic ();
Break;
Case R. id. btn_last:
FrontMusic ();
Break;

Case R. id. btn_pause:
If (mMediaPlayer. isPlaying ()){
// Pause
MMediaPlayer. pause ();
} Else {
// Play
MMediaPlayer. start ();
}
Break;

Case R. id. btn_stop:
// Whether the video is being played
If (mMediaPlayer. isPlaying ()){
// Reset the MediaPlayer to the initial state.
MMediaPlayer. reset ();
}
Break;

}
}

Private void playMusic (File file ){
Try {
// Reset MediaPlayer
MMediaPlayer. reset ();
// Set the playback file path
// MMediaPlayer. setDataSource (file. getAbsolutePath () + File. separator + file. getName ());
MMediaPlayer. setDataSource (file. getAbsolutePath ());
// Play the file
MMediaPlayer. prepare ();
// Start playing
MMediaPlayer. start ();
MMediaPlayer. setOnCompletionListener (new OnCompletionListener (){
@ Override
Public void onCompletion (MediaPlayer mp ){
// After playing the video, start the next one.
NextMusic ();
}
});
} Catch (Exception e ){
E. printStackTrace ();
}
}

// The next one
Private void nextMusic (){
If (++ mCurrentJMusic> = allFiles. size ()){
MCurrentJMusic = 0;
} Else {
PlayMusic (allFiles. get (mCurrentJMusic ));
}
}

// Previous
Private void FrontMusic (){
If (-- mCurrentJMusic> = 0 ){
MCurrentJMusic = allFiles. size ();
} Else {
PlayMusic (allFiles. get (mCurrentJMusic ));
}
}

/*** Recursively retrieve the folder file * TODO: TODO * Author: Andy. liu * Create Time: 11:40:33 * TAG: @ param path file path, usually select the root directory * TAG: @ param fileType file type. * Return: void */

Public void refreshFile (String path, String fileType ){
File file = new File (path );
File [] files = file. listFiles ();
If (null = files)
Return;

For (int I = 0; I <files. length; I ++ ){
If (files [I]. isDirectory ()){
RefreshFile (files [I]. getAbsolutePath (), fileType); // note the Recursive Method
} Else {
If (files [I]. getName (). endsWith (fileType ))
AllFiles. add (files [I]);
}
}
}

}

 

There are many methods to obtain folders in folders, but the recursion method is the most efficient. You should use the best method to solve the problem...