Android development path-Implementation of music player

Strings. xml

<? Xml version = "1.0" encoding = "UTF-8"?> <Resources> <string name = "app_name"> MusicPlayer </string> <string name = "music_name"> tracks </string> <string name = "play_text"> play </ string> <string name = "pause_text"> pause </string> <string name = "continue_text"> continue </string> <string name = "reset_text"> Reset </string> <string name = "stop_text"> stop </string> <string name = "choose_text"> select </string> <string name = "notfoundfile_text"> the media file does not exist </ string> <string name = "notfoundSdcard_text"> SDcard does not exist </string> </resources>

 

 

 

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="fill_parent"        android:layout_height="wrap_content"        android:text="@string/music_name" />    <TableLayout         android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:stretchColumns="0" >        <TableRow >        <EditText            android:id="@+id/musicEt"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:text="l.mp3" />        <Button            android:id="@+id/chooseBtn"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="@string/choose_text" />                </TableRow>    </TableLayout>    <SeekBar        android:id="@+id/seekBar"        android:layout_width="fill_parent"        android:layout_height="wrap_content" />    <SeekBar        android:id="@+id/seekBarSound"       android:layout_width="fill_parent"        android:layout_height="wrap_content"              android:max="100"               android:progress="10"/>              />        <TextView        android:id="@+id/time"         android:layout_width="fill_parent"        android:layout_height="wrap_content"        />    <TableLayout        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:stretchColumns="*" >        <TableRow >            <Button                android:id="@+id/playBtn"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="@string/play_text" />            <Button                android:id="@+id/pauseBtn"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="@string/pause_text" />            <Button                android:id="@+id/stopBtn"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="@string/stop_text" />        </TableRow>    </TableLayout></LinearLayout>

 

MusicPlayerActivity. java

Package cn. csdn. playle; import java. io. file; import java. io. IOException; import android. app. activity; import android. content. context; import android. content. intent; import android. media. audioManager; import android. media. mediaPlayer; import android. OS. bundle; import android. OS. environment; import android. OS. handler; import android. util. log; import android. view. view; import android. view. view. onClickListener; impo Rt android. widget. button; import android. widget. editText; import android. widget. seekBar; import android. widget. seekBar. onSeekBarChangeListener; import android. widget. textView; import android. widget. toast; public class MusicPlayerActivity extends Activity implements OnClickListener, OnSeekBarChangeListener {EditText musicEt; Button playBtn, pauseBtn, stopBtn, chooseBtn; TextView time; AudioManager audiomanag E; int maxVolume, currentVolume; SeekBar seekBar, seekBarSound; MediaPlayer player = null; File file = null; int position = 0; int I = 0; Handler handler = new Handler (); public void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. main); player = new MediaPlayer (); findViews ();} private void findViews () {musicEt = (EditText) this. findViewById (R. id. musicEt); play Btn = (Button) this. findViewById (R. id. playBtn); pauseBtn = (Button) this. findViewById (R. id. pauseBtn); stopBtn = (Button) this. findViewById (R. id. stopBtn); chooseBtn = (Button) this. findViewById (R. id. chooseBtn); seekBar = (SeekBar) this. findViewById (R. id. seekBar); seekBarSound = (SeekBar) this. findViewById (R. id. seekBarSound); time = (TextView) this. findViewById (R. id. time); time. setOnClickListener (this); pla YBtn. setOnClickListener (this); pauseBtn. setOnClickListener (this); stopBtn. setOnClickListener (this); stopBtn. setEnabled (false); pauseBtn. setEnabled (false); seekBar. setOnSeekBarChangeListener (this); chooseBtn. setOnClickListener (new OnClickListener () {public void onClick (View v) {Intent intent = new Intent (MusicPlayerActivity. this, MusicListActivity. class); startActivity (intent) ;}}); audiomanage = (AudioManag Er) getSystemService (Context. AUDIO_SERVICE); maxVolume = audiomanage. getStreamMaxVolume (AudioManager. STREAM_MUSIC); // obtain the maximum system volume seekBarSound. setMax (maxVolume); // match currentVolume = audiomanage with the maximum sound of the system. getStreamVolume (AudioManager. STREAM_MUSIC); // obtain the current value seekBarSound. setProgress (currentVolume); seekBarSound. setOnSeekBarChangeListener (new OnSeekBarChangeListener () // listener {public void onProgressChan Ged (SeekBar arg0, int progress, boolean fromUser) {audiomanage. setStreamVolume (AudioManager. STREAM_MUSIC, progress, 0); currentVolume = audiomanage. getStreamVolume (AudioManager. STREAM_MUSIC); // obtain the current value seekBarSound. setProgress (currentVolume);} public void onStartTrackingTouch (SeekBar seekBar) {} public void onStopTrackingTouch (SeekBar seekBar) {}}); Intent intent = this. getIntent (); String name = intent. ge TStringExtra ("name"); musicEt. setText (name);} public void onClick (View v) {String fileName = musicEt. getText (). toString (). trim (); // obtain whether the status of the sdcard is loaded (MEDIA_MOUNTED loading status) if (Environment. getExternalStorageState (). equals (Environment. MEDIA_MOUNTED) {file = new File (Environment. getExternalStorageDirectory (), fileName); // checks whether the played media file exists if (file. exists () {try {switch (v. getId () {// returns an int value case R. id. pla YBtn: playMusic (file); break; case R. id. pauseBtn: if (player. isPlaying () {player. pause (); pauseBtn. setText (R. string. continue_text);} else {player. start (); pauseBtn. setText (R. string. pause_text);} break; case R. id. stopBtn: player. stop (); stopBtn. setEnabled (false); seekBar. setProgress (0); if (playBtn. getText (). toString (). equals ("reset") {playBtn. setText (R. string. play_text);} if (pauseBtn. getText (). toString (). equal S ("continue") {pauseBtn. setText (R. string. pause_text); pauseBtn. setEnabled (false);} else {pauseBtn. setEnabled (false);} break;} catch (IllegalArgumentException e) {Log. e ("TAG", e. toString ();} catch (IllegalStateException e) {Log. e ("TAG", e. toString ();} catch (IOException e) {Log. e ("TAG", e. toString () ;}} else {Toast. makeText (this, R. string. notfoundfile_text, Toast. LENGTH_LONG ). show () ;}} else {Toast. makeTe Xt (this, R. string. notfoundSdcard_text, Toast. LENGTH_LONG). show () ;}} 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 ();} private void playMusic (File file) throws IllegalStateException, IOException {if (musicEt. getText (). toString () = null | "". equals (musicEt. getText (). toString () {Toast. makeText (this, "No selected song", Toast. LENGTH_LONG ). show ();} else {if (player! = Null) {pauseBtn. setEnabled (true); player. reset (); player. setDataSource (file. getAbsolutePath (); player. prepare (); player. start (); playBtn. setText (R. string. reset_text); run ();} if (playBtn. getText (). toString (). equals ("reset") {pauseBtn. setEnabled (true); stopBtn. setEnabled (true);} if (pauseBtn. getText (). toString (). equals ("continue") {pauseBtn. setText (R. string. pause_text) ;}}} private void run () {new Thread (new Runna Ble () {public void run () {while (player! = Null) {int TIME = player. getDuration (); seekBar. setMax (TIME); // obtain the maximum position of a song = player. getCurrentPosition (); // returns the current playback progress value seekBar. setProgress (position); try {Thread. sleep (3000);} catch (InterruptedException e) {e. printStackTrace ();}}}}). start ();} public void onProgressChanged (SeekBar seekBar, int progress, boolean fromUser) {} public void onStartTrackingTouch (SeekBar seekBar) {player. seekTo (seekBar. getProgress ();} public void onStopTrackingTouch (SeekBar seekBar) {player. seekTo (seekBar. getProgress ());}}

 

 

 

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