The path to the java siege lion (Android)-MP3, MP4, photography, internationalization, style themes, image movement and scaling, android-mp3

The path to the java siege lion (Android)-MP3, MP4, photography, internationalization, style themes, image movement and scaling, android-mp3

I. MP3 player

View the Android API documentation to see the MediaPlayer status transition diagram:

Exercise:

Package com.shellwaygateplayer; import java. io. file; import java. io. IOException; import android. support. v7.app. actionBarActivity; import android. telephony. phoneStateListener; import android. telephony. telephonyManager; import android. content. context; import android. media. mediaPlayer; import android. media. mediaPlayer. onPreparedListener; import android. OS. bundle; import android. OS. environment; import android. uti L. log; import android. view. menu; import android. view. menuItem; import android. view. view; import android. widget. button; import android. widget. editText; import android. widget. toast; public class MainActivity extends ActionBarActivity {// Media Player private MediaPlayer mp; private EditText songName; // whether private boolean pause has been suspended; private File file; private TelephonyManager tm; // pause the save point private int position = 0; @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); songName = (EditText) findViewById (R. id. song_name); tm = (TelephonyManager) getSystemService (Context. TELEPHONY_SERVICE); tm. listen (new MyPhoneStateListener (), PhoneStateListener. LISTEN_CALL_STATE);} private class MyPhoneStateListener extends PhoneStateListene R {@ Override public void onCallStateChanged (int state, String incomingNumber) {// TODO Auto-generated method stub super. onCallStateChanged (state, incomingNumber); switch (state) {case TelephonyManager. CALL_STATE_IDLE: // idle status if (position> 0 & mp! = Null) {// jump to the specified storage point location mp. seekTo (position); mp. start ();} break; case TelephonyManager. CALL_STATE_OFFHOOK: // Answer status if (mp! = Null) {if (mp. isPlaying () {position = mp. getCurrentPosition (); mp. pause () ;}} break; case TelephonyManager. CALL_STATE_RINGING: // if (mp. isPlaying () {position = mp. getCurrentPosition (); mp. pause () ;}break; default: break ;}/// the Activity life cycle method is used to listen for paused playback when calling. // @ Override // protected void onResume () {// TODO Auto-generated method stub // super. onResume (); // if (position> 0) {// jump to the specified position // Mp. seekTo (position); // mp. start (); //} // @ Override // protected void onPause () {// TODO Auto-generated method stub // super. onPause (); // position = mp. getCurrentPosition (); // mp. pause (); //} public void play (View view) {String name = songName. getText (). toString (); file = new File (Environment. getExternalStorageDirectory (), name + ". mp3 "); if (! File. exists () {Toast. makeText (this, "the file does not exist", Toast. LENGTH_SHORT). show (); mp = null;} else {if (mp! = Null) {if (mp. isPlaying () {Toast. makeText (this, "the song is playing", Toast. LENGTH_SHORT ). show () ;}else {play () ;}} else {play () ;}} public void play () {try {mp = new MediaPlayer (); // set it to the Initial State mp. reset (); // specifies the file mp to be played. setDataSource (file. getAbsolutePath (); // prepare (buffer) mp. prepare (); // set the buffer to complete the listener mp. setOnPreparedListener (new MyOnPreparedListener ();} catch (Exception e) {// TODO Auto-generated catch block E. printStackTrace () ;}} private class MyOnPreparedListener implements OnPreparedListener {@ Override public void onPrepared (MediaPlayer mp) {// TODO Auto-generated method stub // play mp. start () ;}} public void pause (View view) {if (mp. isPlaying () {// pause Playing mp. pause (); Button bt = (Button) view; bt. setText ("continue"); pause = true;} else {if (pause) {mp. start (); Button bt = (Button) view; bt. setText ("Stop Stop ") ;}} public void stop (View view) {if (mp! = Null) {// stop Playing mp. stop () ;}} public void reset (View view) {if (mp! = Null) {mp. start () ;}@ Override protected void onDestroy () {// TODO Auto-generated method stub super. onDestroy (); if (mp! = Null) {mp. release (); mp = null ;}}}MainActivity. java <LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" android: layout_width = "match_parent" android: layout_height = "match_parent" android: orientation = "vertical"> <TextView android: layout_width = "fill_parent" android: layout_height = "wrap_content" android: text = "Enter the song name"/> <EditText android: id = "@ + id/song_name" android: layout_width = "fill_parent" android: layout_height = "wrap_content" android: text = "Complicated"/> <LinearLayout android: layout_width = "fill_parent" android: layout_height = "wrap_content" android: orientation = "horizontal"> <Button android: layout_width = "0dp" android: layout_height = "wrap_content" android: layout_weight = "1" android: onClick = "play" android: text = "play"/> <Button android: layout_width = "0dp" android: layout_height = "wrap_content" android: layout_weight = "1" android: onClick = "pause" android: text = "pause"/> <Button android: layout_width = "0dp" android: layout_height = "wrap_content" android: layout_weight = "1" android: onClick = "stop" android: text = "stop"/> <Button android: layout_width = "0dp" android: layout_height = "wrap_content" android: layout_weight = "1" android: onClick = "reset" android: text = "replay"/> </LinearLayout>Activity_main.xml <? Xml version = "1.0" encoding = "UTF-8"?> <Manifest xmlns: android = "http://schemas.android.com/apk/res/android" package = "com.shellwaygateplayer" android: versionCode = "1" android: versionName = "1.0"> <uses-sdk android: minSdkVersion = "8" android: targetSdkVersion = "21"/> <! -- The permission to read the call status is required to listen to the call status --> <uses-permission android: name = "android. permission. READ_PHONE_STATE "/> <application android: allowBackup =" true "android: icon =" @ drawable/ic_launcher "android: label =" @ string/app_name "android: theme = "@ style/AppTheme"> <activity android: name = ". mainActivity "android: label =" @ string/app_name "> <intent-filter> <action android: name =" android. intent. action. MAIN "/> <category android: name =" android. intent. category. LAUNCHER "/> </intent-filter> </activity> </application> </manifest>AndroidManifest. xml

Running result:

Ii. MP4 Player

 

 

 

 

 

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