Question

我正在开发一款应用程序，我需要使用开关切换音频状态静音和取消静音功能。目前，开关状态是持久保存的，但我一直遇到音频状态问题，因为它在先前静音后没有取消静音。除了重新启动应用程序时，我无法取消静音。但是，静音时会保存音频状态。我该怎么办？

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);
        mSoundSwitch = (Switch) findViewById(R.id.soundSwitch);
sharedPreferences =  getPreferences(Context.MODE_PRIVATE);
        boolean isSound = sharedPreferences.getBoolean("sound",false);
        mSoundSwitch.setChecked(isSound);
        if(mSoundSwitch.isChecked()){
            unmute();
        } else {
            mute();
        }
        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();

}
            }
           // retreiving value from shared prefrences (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

您已保存了偏好设置，但已检索到偏好设置并仅使用SettingsActivity。

要解决您的问题，请在应用的开头（例如onCreate的{{1}}），检查共享偏好设置中的值并采取相应措施。

Answer 2

在致电boolean isSound = sharedPreferences.getBoolean("sound",false);之前，您应该使用setOnCheckedChangeListener。您将知道已保存的状态

试试这个。

SharedPreferences sharedPreferences;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_settings);

    sharedPreferences =  getPreferences(Context.MODE_PRIVATE);
    boolean isSound = sharedPreferences.getBoolean("sound",false);
    // edited here 
    mSoundSwitch.setChecked(isSound);
    if(mSoundSwitch.isChecked()){
        unmute();
    } else {
        mute();
    }
    mSoundSwitch = (Switch) findViewById(R.id.soundSwitch);
    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 {

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

            }
        }

    }

}

音频状态不会持久保存共享首选项

2 个答案: