如何在 Android 的 MainActivity 中暂停/播放背景音乐？

Posted 2023-03-08

【中文标题】如何在 Android 的 MainActivity 中暂停/播放背景音乐？

【英文标题】：How to pause/play background music in MainActivity in Android?

【发布时间】：2019-03-23 17:04:49

【问题描述】：

我正在 Splashscreen.class 中调用 MusicaFundo 服务，并希望在 MainActivity.class 中暂停/播放它。 我正在尝试使用 sendBroadcast 但服务没有接收到意图，我在 MusicaFundo.class 中创建了 BroadcastReceiver、MyServiceReceiver，这样做有错吗？

MainActivity.class

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity 
    boolean musicaTocar = false;
    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Intent svc = new  Intent (this, MusicaFundo.class);

        TextView titulo = findViewById(R.id.titulo);
        final ImageView som = findViewById(R.id.som);
        som.setBackgroundResource(R.drawable.volumeup);


        final ImageView jogomem = findViewById(R.id.jogomem);

        jogomem.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View v) 
        Animation diminuir = (Animation) AnimationUtils.loadAnimation(MainActivity.this, R.anim.diminuir);
        jogomem.startAnimation(diminuir);
        Intent jogomemoria = new Intent(MainActivity.this, JogoMemoria.class);
        startActivity(jogomemoria);

            
        );


        Animation deslocarD = (Animation) AnimationUtils.loadAnimation(this, android.R.anim.slide_in_left);
        titulo.startAnimation(deslocarD);



        som.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View v) 
                if (!musicaTocar)
                    som.setBackgroundResource(R.drawable.volumemut);
                    playMusica();
                    musicaTocar = true;
                
                else 
                    if (musicaTocar)
                        som.setBackgroundResource(R.drawable.volumeup);
                        pausarMusica();
                        musicaTocar = false;
                    
                
            
        );



    

    private void pausarMusica() 
        Intent pausar = new Intent();
        pausar.setAction("pausar");
        sendBroadcast(pausar);
    

    private void playMusica() 
        Intent tocar = new Intent();
        tocar.setAction("tocarmusica");
        sendBroadcast(tocar);
    

MusicaFundo.class 内部

 public class MusicaFundo extends Service 
        private MediaPlayer player;
        public int posatual = 0;
        private static final String TAG = "MusicaFundo";

        public static Object getName() 
            return null;
        

        @Override
        public IBinder onBind(Intent intent) 
            return null;
        

        @Override
        public void onCreate()
            player = MediaPlayer.create(this, R.raw.musicafundo);
            player.setLooping(true);
        

        @Override
        public int onStartCommand(Intent intent, int flags, int startId) 
            player.seekTo(posatual);
            player.start();
            return START_STICKY;

        

         public boolean onUnbind(Intent intent)
             return false;
         



        @Override
        public void onDestroy() 
            super.onDestroy();
            if (player != null) 
                if (player.isPlaying()) 
                    player.stop();
                
                player.release();
            
        


        public void resumeMusic()
            if (player != null) 
                if (player.isPlaying() == false) 
                    player.seekTo(posatual);
                    player.start();
                
            
        

        public void onPause()
            if (player != null) 
                if (player.isPlaying()) 
                    posatual = player.getCurrentPosition();
                    player.pause();
                
            
          

     public class MyServiceReceiver extends BroadcastReceiver 
            @Override
            public void onReceive(Context context, Intent intent)   
               String pausa = intent.getAction();

                if(pausa.equals("pausar"))
                    onPause();
                    Log.d(TAG, "onReceive: " + pausa);
                
                else if(pausa.equals("tocarmusica"))
                    resumeMusic();
                    Log.d(TAG, "onReceive: " + pausa);

                
            
        

想要接收意图，以便它比较字符串以暂停或播放。

【问题讨论】：

添加活动和服务的完整源代码

【参考方案1】：

不确定问题中的代码是否不完整，但您需要在服务中调用 registerReceiver 以便接收器实际接收广播。

另外，如果这主要是在同一进程中进行通信，我建议使用LocarBroadcastManager，因为它更高效、更安全。

【讨论】：

是的，缺少代码，您的回答对我帮助很大！它现在正在工作