android音乐播放

╰半橙微兮° 2023-01-03 04:22 329阅读 0赞

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布局就几个按钮  
![在这里插入图片描述][20210107115028265.png]

<?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" >
    
        <Button android:id="@+id/btn_main_play" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="play" />
    
        <Button android:id="@+id/btn_main_stop" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="stop" />
    
        <Button android:id="@+id/btn_main_pause" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="pause" />
    
        <Button android:id="@+id/btn_main_exit" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="exit" />
    
    </LinearLayout>

处理Activity类

package com.hbk.musicservice;
    
    import android.app.Activity;
    import android.content.Intent;
    import android.os.Bundle;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    
    public class MainActivity extends Activity implements OnClickListener { 
    
    	private Button btn_main_play;
    	private Button btn_main_stop;
    	private Button btn_main_pause;
    	private Button btn_main_exit;
    
    	@Override
    	protected void onCreate(Bundle savedInstanceState) { 
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.activity_main);
    
    		btn_main_play = (Button) findViewById(R.id.btn_main_play);
    		btn_main_stop = (Button) findViewById(R.id.btn_main_stop);
    		btn_main_pause = (Button) findViewById(R.id.btn_main_pause);
    		btn_main_exit = (Button) findViewById(R.id.btn_main_exit);
    
    		btn_main_play.setOnClickListener(this);
    		btn_main_stop.setOnClickListener(this);
    		btn_main_pause.setOnClickListener(this);
    		btn_main_exit.setOnClickListener(this);
    	}
    
    	// 通过Intent携带数据进行区分
    	@Override
    	public void onClick(View v) { 
    		Intent intent = new Intent(this, MusicService.class);
    		if (btn_main_play == v) { //播放
    			intent.putExtra("action", "play");
    			startService(intent);
    		} else if (btn_main_stop == v) { //停止播放
    			intent.putExtra("action", "stop");
    			startService(intent);
    		} else if (btn_main_pause == v) { //暂停音乐
    			intent.putExtra("action", "pause");
    			startService(intent);
    		} else if (btn_main_exit == v) { //退出并停止音乐
    			//停止服务
    			stopService(intent);
    			finish();
    		}
    	}
    }

注意不能使用Activity去处理，而是用上面的Service

package com.hbk.musicservice;
    
    import android.app.Activity;
    import android.media.MediaPlayer;
    import android.os.Bundle;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    /** * 结论：不能使用Activity去播放音乐，当按退出返回键，重新进入的时候，点播放会重复播放，无法控制。 * @author 黄宝康 * */
    public class MainActivity1 extends Activity implements OnClickListener { 
    
    	private Button btn_main_play;
    	private Button btn_main_stop;
    	private Button btn_main_pause;
    	private Button btn_main_exit;
    
    	@Override
    	protected void onCreate(Bundle savedInstanceState) { 
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.activity_main);
    
    		btn_main_play = (Button) findViewById(R.id.btn_main_play);
    		btn_main_stop = (Button) findViewById(R.id.btn_main_stop);
    		btn_main_pause = (Button) findViewById(R.id.btn_main_pause);
    		btn_main_exit = (Button) findViewById(R.id.btn_main_exit);
    
    		btn_main_play.setOnClickListener(this);
    		btn_main_stop.setOnClickListener(this);
    		btn_main_pause.setOnClickListener(this);
    		btn_main_exit.setOnClickListener(this);
    	}
    
    	@Override
    	public void onClick(View v) { 
    		if (btn_main_play == v) { //播放
    			playMusic();
    		} else if (btn_main_stop == v) { //停止播放
    			stopMusic();
    		} else if (btn_main_pause == v) { //暂停音乐
    			pauseMusic();
    		} else if (btn_main_exit == v) { //退出并停止音乐
    			exitMusic();
    		}
    	}
    
    	private MediaPlayer player;
    	private void exitMusic() { 
    		stopMusic();
    		finish();
    	}
    
    	/* * 暂停音乐 */
    	private void pauseMusic() { 
    		if(player!=null && player.isPlaying()) { 
    			player.pause();
    		}
    	}
    
    	private void stopMusic() { 
    		if(player!=null) { 
    			player.stop();//停止
    			player.reset();//重置
    			player.release();//释放资源
    			player = null;//赋空
    		}
    	}
    
    	/** * 播放音乐 */
    	private void playMusic() { 
    		if(player==null) { 
    			player = MediaPlayer.create(this,R.raw.water_hander);
    		}
    		player.start();
    	}
    }

清单文件注册Service

把音乐文件放在raw文件夹下  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2h1YW5nYmFva2FuZw_size_16_color_FFFFFF_t_70]

[Link 1]: https://www.captainai.net/flyop007/
[20210107115028265.png]: /images/20221119/dd757c3d50024ca6931c99b47fc237d6.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2h1YW5nYmFva2FuZw_size_16_color_FFFFFF_t_70]: /images/20221119/9d19d2190b8d4349b388b411a055cffd.png