独立开发音乐播放器
第一先整体布置好ui布局 开始动手：
先找好素材， 修改了mainActivity 去掉title
去掉title 方法之前已近写过了就不多说了！
定义main.xml 进入应用程序的布局
搞了一整天 主要是素材难搞
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" > <ImageView android:id="@+id/mainIco" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_weight="1" android:src="@drawable/backg" /> <SeekBar android:id="@+id/seekBar" android:layout_width="fill_parent" android:layout_height="wrap_content" android:minHeight="3pt" android:maxHeight="3pt" android:paddingLeft="2pt" android:paddingRight="2pt" android:scrollbars="horizontal" android:thumb="@drawable/bar" android:thumbOffset="1pt" /> <RelativeLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_weight="1" > <TextView android:id="@+id/startTime" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:text="00:20" /> <TextView android:id="@+id/startTime" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:layout_alignParentTop="true" android:text="03:20" /> <ImageButton android:id="@+id/play" android:layout_width="10pt" android:layout_height="10pt" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:background="@drawable/image_button" android:src="@drawable/play" android:onClick="mediaPlay" /> <ImageButton android:id="@+id/fast" android:layout_width="10pt" android:layout_height="10pt" android:layout_alignBottom="@id/play" android:layout_toRightOf="@id/play" android:background="@drawable/image_button" android:src="@drawable/fast" /> <ImageButton android:id="@+id/next" android:layout_width="10pt" android:layout_height="10pt" android:layout_alignBottom="@id/fast" android:layout_toRightOf="@id/fast" android:background="@drawable/image_button" android:src="@drawable/next" /> <ImageButton android:id="@+id/slow" android:layout_width="10pt" android:layout_height="10pt" android:layout_alignBottom="@id/play" android:layout_toLeftOf="@id/play" android:background="@drawable/image_button" android:src="@drawable/slow" /> <ImageButton android:id="@+id/last" android:layout_width="10pt" android:layout_height="10pt" android:layout_alignBottom="@id/slow" android:layout_toLeftOf="@id/slow" android:background="@drawable/image_button" android:src="@drawable/last" /> </RelativeLayout> </LinearLayout>
package codefans.app.service; import java.io.File; import java.io.IOException; import android.app.Service; import android.content.Intent; import android.media.MediaPlayer; import android.media.MediaPlayer.OnPreparedListener; import android.os.Binder; import android.os.Environment; import android.os.IBinder; public class Mp3Service extends Service { private IBinder myBinder = new Mp3IBinder(); private MediaPlayer mediaPlayer; private File musicFile; @Override public void onCreate() { if(this.mediaPlayer == null) { this.mediaPlayer = new MediaPlayer(); } } @Override public void onDestroy() { if(this.mediaPlayer != null) { this.mediaPlayer.stop(); this.mediaPlayer.release(); this.mediaPlayer = null; } super.onDestroy(); } @Override public IBinder onBind(Intent intent) { return myBinder; } //开始播放 private void playMusci(String fileName) { try { this.musicFile = new File(Environment.getExternalStorageDirectory(), fileName); this.mediaPlayer.setDataSource(musicFile.getAbsolutePath()); this.mediaPlayer.prepare(); this.mediaPlayer.setOnPreparedListener(new MyPreParedListenner()); } catch (IllegalArgumentException e) { e.printStackTrace(); } catch (IllegalStateException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } //mediaPlayer缓存完执行事件 private class MyPreParedListenner implements OnPreparedListener { public void onPrepared(MediaPlayer mp) { Mp3Service.this.mediaPlayer.start(); } } /** * 新建一个内部类 Activity调用service时返回此binder * @author Codefans */ private class Mp3IBinder extends Binder implements Player { public void playMusic(String filePath) { Mp3Service.this.playMusci(filePath); } } }
service 播放功能
package codefans.app.activity; import codefans.app.service.Player; import codefans.mp3layer.R; import android.app.Activity; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.ServiceConnection; import android.os.Bundle; import android.os.IBinder; import android.view.View; import android.widget.ImageButton; public class Mp3PlayerActivity extends Activity { private boolean flag = false; private ImageButton playBt; private Player binder; private ServiceConnection myServiceConnection = new MyServiceConnection(); /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); this.playBt = (ImageButton) findViewById(R.id.play); Intent intent = new Intent("codefans.action.Mp3Player"); bindService(intent, myServiceConnection, Context.BIND_AUTO_CREATE); } //播放按钮点击 public void mediaPlay(View v) { if(flag == false) //改变播放按钮图标 { playBt.setImageResource(R.drawable.stop); flag = true; this.binder.playMusic("qq.mp3"); } else { playBt.setImageResource(R.drawable.play); flag = false; } } @Override protected void onDestroy() { unbindService(myServiceConnection); super.onDestroy(); } //启动服务需要类 private class MyServiceConnection implements ServiceConnection { public void onServiceConnected(ComponentName name, IBinder service) { Mp3PlayerActivity.this.binder = (Player) service; } public void onServiceDisconnected(ComponentName name) { Mp3PlayerActivity.this.binder = null; } } }
这里用bindservice 好像不行，因为这样如果挂掉Activity 那个service服务也停止了 应该用startservice ！ 这个明天再写了 很迟了（嘿嘿）
只写了一个播放功能
package codefans.app.activity; import codefans.app.util.Mp3Util; import codefans.mp3layer.R; import android.app.Activity; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.os.Bundle; import android.view.View; import android.widget.ImageButton; import android.widget.SeekBar; public class Mp3PlayerActivity extends Activity { private boolean flag = false; //播放 暂停 变量判断 private ImageButton playBt; private SeekBar seekBar; private Intent intent; //播放信息意图 private Bundle bundle; //意图传递的信息 private SeekBarReceiver receiver; private int position; //播放进度条位置 @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); this.playBt = (ImageButton) findViewById(R.id.play); this.seekBar = (SeekBar) findViewById(R.id.seekBar); //意图 启动service使用 this.intent = new Intent("codefans.action.Mp3Player"); bundle = new Bundle(); //注册广播接受器 receiver = new SeekBarReceiver(); IntentFilter filter = new IntentFilter(); filter.addAction("codefans.intent.action.Mp3Player"); this.registerReceiver(receiver, filter); } //播放按钮点击 public void mediaPlay(View v) { if(flag == false) //改变播放按钮图标 { playBt.setImageResource(R.drawable.stop); flag = true; this.bundle.putString("filePath", "qq.mp3"); this.bundle.putInt("operate", Mp3Util.PLAY); this.intent.putExtras(bundle); startService(intent); } else { playBt.setImageResource(R.drawable.play); flag = false; this.bundle.putInt("operate", Mp3Util.STOP); this.intent.putExtras(bundle); startService(intent); } } @Override protected void onDestroy() { this.unregisterReceiver(receiver); //解除接受广播 super.onDestroy(); } /** * bindService 实现需要 这里使用startservice * @author Codefans * //启动服务需要类 private class MyServiceConnection implements ServiceConnection { public void onServiceConnected(ComponentName name, IBinder service) { Mp3PlayerActivity.this.binder = (Player) service; } public void onServiceDisconnected(ComponentName name) { Mp3PlayerActivity.this.binder = null; } } */ /** * 播放进度条 位置广播接受器 * @author Codefans * */ private class SeekBarReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { Mp3PlayerActivity.this.position = intent.getIntExtra("position", 0); // Message msg = new Message(); Mp3PlayerActivity.this.seekBar.setProgress(position); // Log.i("result", String.valueOf(position)); } } }
package codefans.app.service; import java.io.File; import java.io.IOException; import codefans.app.util.Mp3Util; import android.app.Service; import android.content.Intent; import android.media.MediaPlayer; import android.media.MediaPlayer.OnPreparedListener; import android.os.Bundle; import android.os.Environment; import android.os.IBinder; public class Mp3Service extends Service { private MediaPlayer mediaPlayer; private File musicFile; private String name; @Override public void onCreate() { if (this.mediaPlayer == null) { this.mediaPlayer = new MediaPlayer(); } } @Override public void onDestroy() { if (this.mediaPlayer != null) { this.mediaPlayer.stop(); this.mediaPlayer.release(); this.mediaPlayer = null; } super.onDestroy(); } @Override public int onStartCommand(Intent intent, int flags, int startId) { Bundle bundle = intent.getExtras(); switch (bundle.getInt("operate")) { case Mp3Util.PLAY: this.playMusci(bundle.getString("filePath")); break; case Mp3Util.STOP: this.stop(); break; } return START_STICKY; } @Override public IBinder onBind(Intent intent) { return null; } // 开始播放 private void playMusci(String fileName) { try { if (fileName.equals(name)) //播放同文件 { this.mediaPlayer.start(); } else //播放不同文件 { this.name = fileName; this.musicFile = new File( Environment.getExternalStorageDirectory(), fileName); this.mediaPlayer.reset(); this.mediaPlayer.setDataSource(musicFile.getAbsolutePath()); this.mediaPlayer.prepare(); this.mediaPlayer .setOnPreparedListener(new MyPreParedListenner()); Thread t = new SendBroadCastThread(); t.start(); } } catch (IllegalArgumentException e) { e.printStackTrace(); } catch (IllegalStateException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } private void stop() //暂停 { this.mediaPlayer.pause(); } // mediaPlayer缓存完执行事件 private class MyPreParedListenner implements OnPreparedListener { public void onPrepared(MediaPlayer mp) { mp.start(); } } /** * 发送播放位置线程， 每隔一秒发送一次广播 改变播放器进度条 * @author Codefans * */ private class SendBroadCastThread extends Thread { @Override public void run() { while(true) { Intent intent = new Intent(); intent.putExtra("position", Mp3Service.this.mediaPlayer.getCurrentPosition()); intent.setAction("codefans.intent.action.Mp3Player");// action与接收器相同 sendBroadcast(intent); //发送广播 try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } } } /** * 新建一个内部类 Activity调用service时返回此binder * * @author Codefans * * private class Mp3IBinder extends Binder implements Player { * * public void playMusic(String filePath) { * Mp3Service.this.playMusci(filePath); } * * } */ }
今天主要写了关闭Activity后台依然在唱歌 还有一个就是进度条跟随播放 前进
