试试这个code：

 进口android.support.v7.app.ActionBarActivity;
进口android.content.Context;
进口android.media.AudioManager;
进口android.media.MediaPlayer;
进口android.os.Bundle;
进口android.util.Log;
进口android.view.View;
进口android.view.View.OnClickListener;
进口android.widget.Button;
进口android.widget.Toast;

公共类MainActivity扩展ActionBarActivity {
按钮播放，静音，数据，最大值;
私人布尔VolIsMute;
AudioManager经理;
INT currentVolume;
@覆盖
保护无效的onCreate（包savedInstanceState）{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.activity_main）;
    经理=（AudioManager）getSystemService（Context.AUDIO_SERVICE）;
    VolIsMute = FALSE;
    在里面（）;
}
公共无效isMute（）{
    如果（VolIsMute）{
        manager.setStreamMute（AudioManager.STREAM_MUSIC，假）;
        VolIsMute = FALSE;
    } 其他 {
        manager.setStreamMute（AudioManager.STREAM_MUSIC，真正的）;
        VolIsMute = TRUE;
    }
}
公共无效的init（）{
    最大=（按钮）findViewById（R.id.max）;
    玩=（按钮）findViewById（R.id.start）;
    静音=（按钮）findViewById（R.id.mute）;
    play.setOnClickListener（新OnClickListener（）{
        @覆盖
        公共无效的onClick（视图v）{
            尝试 {
                MediaPlayer的MP = MediaPlayer.create（
                        getApplicationContext（），R.raw.abc）;
                mp.start（）;
            }赶上（NullPointerException异常E）{
                e.printStackTrace（）;
                Log.d（跆拳道，错误：+ E）;
            }

        }
    }）;
}
公共无效静音（查看视图）{
    currentVolume = manager.getStreamVolume（AudioManager.STREAM_MUSIC）;
    如果（currentVolume == 0）{
        Toast.makeText（getApplicationContext（），
                卷是+ currentVolume +preSS取消静音，Toast.LENGTH_SHORT）.show（）;
    } 其他 {
        isMute（）;
    }
}
公共无效checvol（查看视图）{

    currentVolume = manager.getStreamVolume（AudioManager.STREAM_MUSIC）;
    如果（currentVolume！= 0）{
        Toast.makeText（getApplicationContext（），
                preSS取消静音，Toast.LENGTH_SHORT）.show（）;
    } 其他 {
        isMute（）;
    }
}
}
 

  

我用了两个按钮，一个是静音等为取消静音。   首先检查当前的体积，然后用，如果-else做适当的。

对于那些谁简化，不要忘了张贴code。

i build an app , and i want to mute and unmute just the sound of this app.. i found this code to mute the sound:

    AudioManager aManager=(AudioManager)getSystemService(AUDIO_SERVICE);
    aManager.setStreamMute(AudioManager.STREAM_MUSIC, true);

It mutes all the sound of the device and disables the setting of the device to set the sound, not just the sound of the app.. And i found this code to unmute the sound:

    AudioManager aManager=(AudioManager)getSystemService(AUDIO_SERVICE);
    aManager.setStreamMute(AudioManager.STREAM_MUSIC, false);

When i have muted the sound, and i clicked the button that contains this code, this code is not running and the sound setting of my device is still disabled.. I just want to mute and unmute the sound of my app, not my device.. Any correction?

Try this code:

import android.support.v7.app.ActionBarActivity;
import android.content.Context;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {
Button play, mute, data, max;
private boolean VolIsMute;
AudioManager manager;
int currentVolume;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    manager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
    VolIsMute = false;
    init();
}
public void isMute() {
    if (VolIsMute) {
        manager.setStreamMute(AudioManager.STREAM_MUSIC, false);
        VolIsMute = false;
    } else {
        manager.setStreamMute(AudioManager.STREAM_MUSIC, true);
        VolIsMute = true;
    }
}
public void init() {
    max = (Button) findViewById(R.id.max);
    play = (Button) findViewById(R.id.start);
    mute = (Button) findViewById(R.id.mute);
    play.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            try {
                MediaPlayer mp = MediaPlayer.create(
                        getApplicationContext(), R.raw.abc);
                mp.start();
            } catch (NullPointerException e) {
                e.printStackTrace();
                Log.d("WTF", "error: " + e);
            }

        }
    });
}
public void mute(View view) {
    currentVolume = manager.getStreamVolume(AudioManager.STREAM_MUSIC);
    if (currentVolume == 0) {
        Toast.makeText(getApplicationContext(),
                " Volume is " + currentVolume +"Press unmute", Toast.LENGTH_SHORT).show();
    } else {
        isMute();
    }
}
public void checvol(View view) {

    currentVolume = manager.getStreamVolume(AudioManager.STREAM_MUSIC);
    if (currentVolume != 0) {
        Toast.makeText(getApplicationContext(),
                "Press unmute", Toast.LENGTH_SHORT).show();
    } else {
        isMute();
    }
}
}

I used two buttons one for mute and other for unmute. Check the current volume first and then do appropriately with if -else.

For those who simplify this,don't forget to post the code.