调节系统声音和亮度

AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
int maxVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
seekBar.setMax(maxVolume);
seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        //flags为0代表不显示音量条
        audioManager.setStreamVolume(AudioManager.STREAM_MUSIC,progress,0);
    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {
    }

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
    }
});

seekBar2.setMax(255);
//关闭自动亮度调节，否则有问题
android.provider.Settings.System.putInt(TestControllerActivity.this.getContentResolver(), android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE,  android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
seekBar2.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        android.provider.Settings.System.putInt(TestControllerActivity.this.getContentResolver(), android.provider.Settings.System.SCREEN_BRIGHTNESS, progress);
    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {
    }

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
    }
});