java - 为Android取消静音

Question

我有一个应用程序，其中我实现了一个切换按钮来打开和关闭音频。我非常了解，使用adjustStreamVolume仅适用于api 23及更高版本，而setStreamMute已弃用，因此我由逻辑进行了适当处理。
但是，我在设备api低于api 23的音频状态方面遇到问题，因为在之前被静音后它不会取消静音。无论如何，对于api 23及更高版本，开关和音频状态都可以正常工作，但是我需要有关如何针对低于23的设备api正确静音和取消静音设备的帮助。
这是我的逻辑。

public class SettingsActivity extends AppCompatActivity {
    private Switch mSoundSwitch;
    SharedPreferences sharedPreferences;
    SharedPreferences.Editor editor;
    AudioManager aManager;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_settings);
        sharedPreferences =  getPreferences(Context.MODE_PRIVATE);
        mSoundSwitch = (Switch) findViewById(R.id.soundSwitch);
        sharedPreferences =  getPreferences(Context.MODE_PRIVATE);
        mSoundSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
    unmute();
    sharedPreferences =  getPreferences(Context.MODE_PRIVATE);
    editor = sharedPreferences.edit();
    editor.putBoolean("sound", true);
    editor.apply();

} else {
   mute();
    sharedPreferences =  getPreferences(Context.MODE_PRIVATE);
    editor = sharedPreferences.edit();
    editor.putBoolean("sound", false);
    editor.apply();

}
            }
        });
           // retrieving value from shared preferences (sound)
        sharedPreferences = getPreferences(Context.MODE_PRIVATE);
        boolean isChecked = sharedPreferences.getBoolean("sound", true);
        mSoundSwitch.setChecked(isChecked);

    }
    private void mute() {
        //mute audio
        aManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
            aManager.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_MUTE, 0);
        } else {
            aManager.setStreamMute(AudioManager.STREAM_MUSIC, true);
        }
    }

    public void unmute() {
        //unmute audio
        aManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
            aManager.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_UNMUTE, 0);
        } else {
            aManager.setStreamMute(AudioManager.STREAM_MUSIC, false);
        }
    }

}

Answer 1

我用以下代码解决了我的问题:

 private void mute() {
        //mute audio
        aManager = (AudioManager) this.getSystemService(Context.AUDIO_SERVICE);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
            aManager.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_MUTE, 0);
        } else {
           aManager.setStreamVolume(AudioManager.STREAM_MUSIC, 0, 0);
        }
    }

    public void unmute() {
        //unmute audio
        aManager = (AudioManager) this.getSystemService(Context.AUDIO_SERVICE);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
            aManager.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_UNMUTE, 0);
        } else {
            aManager.setStreamVolume(AudioManager.STREAM_MUSIC, 20, 0);
        }
    }