安卓应用控制系统音乐

最近在项目中有用到原生安卓和IOS，所以将自己最近所学的收获记录一下~

项目中有一个需求是通过手环来控制手机上的系统音乐播放/暂停或者进行上一首下一首的切换，在这里用到了安卓中的AudioManager来实现系统音乐的管理

首先要获取到AudioManager ：

AudioManager audioManager = ((AudioManager) getSystemService(Context.AUDIO_SERVICE));

获取到AudioManager类之后一切就好办了，首先第一个需求，获取当前是否在播放音乐

使用AudioManager中的isMusicActive()方法即可，该方法会返回一个布尔值，true表示当前有声音正在播放，false则表示没有

boolean isMusicActive = audioManager.isMusicActive();

接下来是暂停或者开始音乐

这里使用AudioManager发送KeyEvent按键事件即可

KeyEvent downEvent = new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE);
        KeyEvent upEvent = new KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE);
        ((AudioManager) getSystemService(Context.AUDIO_SERVICE)).dispatchMediaKeyEvent(downEvent);
        ((AudioManager) getSystemService(Context.AUDIO_SERVICE)).dispatchMediaKeyEvent(upEvent);

接下来是下一首，与暂停/开始音乐同样的方法:

KeyEvent downEvent = new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_MEDIA_NEXT);
        KeyEvent upEvent = new KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_MEDIA_NEXT);
        ((AudioManager) getSystemService(Context.AUDIO_SERVICE)).dispatchMediaKeyEvent(downEvent);
        ((AudioManager) getSystemService(Context.AUDIO_SERVICE)).dispatchMediaKeyEvent(upEvent);

上一首:

KeyEvent downEvent = new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_MEDIA_PREVIOUS);
        KeyEvent upEvent = new KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_MEDIA_PREVIOUS);
        ((AudioManager) getSystemService(Context.AUDIO_SERVICE)).dispatchMediaKeyEvent(downEvent);
        ((AudioManager) getSystemService(Context.AUDIO_SERVICE)).dispatchMediaKeyEvent(upEvent);

OK,现在我们已经实现基本的音乐控制了，接下来写一个Activity来进行测试一下，这里我简单的使用三个按键来绑定事件测试一下：

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MainActivity.java:

package com.shine.music;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.media.AudioManager;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        AudioManager audioManager = ((AudioManager) getSystemService(Context.AUDIO_SERVICE));
        boolean isMusicActive = audioManager.isMusicActive();
        Log.e("shine",isMusicActive + "");
    }

    public void lastMusic(View view) {
        KeyEvent downEvent = new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_MEDIA_PREVIOUS);
        KeyEvent upEvent = new KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_MEDIA_PREVIOUS);
        ((AudioManager) getSystemService(Context.AUDIO_SERVICE)).dispatchMediaKeyEvent(downEvent);
        ((AudioManager) getSystemService(Context.AUDIO_SERVICE)).dispatchMediaKeyEvent(upEvent);
    }

    public void playMusicLocal(View view) {
        KeyEvent downEvent = new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE);
        KeyEvent upEvent = new KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE);
        ((AudioManager) getSystemService(Context.AUDIO_SERVICE)).dispatchMediaKeyEvent(downEvent);
        ((AudioManager) getSystemService(Context.AUDIO_SERVICE)).dispatchMediaKeyEvent(upEvent);
    }

    public void nextMusicLocal(View view) {
        KeyEvent downEvent = new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_MEDIA_NEXT);
        KeyEvent upEvent = new KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_MEDIA_NEXT);
        ((AudioManager) getSystemService(Context.AUDIO_SERVICE)).dispatchMediaKeyEvent(downEvent);
        ((AudioManager) getSystemService(Context.AUDIO_SERVICE)).dispatchMediaKeyEvent(upEvent);
    }
}

 经测试是没问题的~

完整代码:

https://github.com/jiayaoxu/musicManager.git