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[Android开发]Android 音量及屏幕亮度调节

屏幕亮度调节

/**
* 滑动改变亮度
* @param percent
*/
private void onBrightnessSlide(float percent) {
if (mBrightness < 0) { // mBrightness是当前屏幕的亮度
mBrightness = getWindow().getAttributes().screenBrightness;
if (mBrightness <= 0.00f)
mBrightness = 0.50f;
if (mBrightness < 0.01f)
mBrightness = 0.01f;
// 显示
mOperationBg.setImageResource(R.drawable.video_brightness_bg);
mVolumeBrightnessLayout.setVisibility(View.VISIBLE);
}
WindowManager.LayoutParams lpa = getWindow().getAttributes();
lpa.screenBrightness = mBrightness + percent;
if (lpa.screenBrightness > 1.0f)
lpa.screenBrightness = 1.0f;
else if (lpa.screenBrightness < 0.01f)
lpa.screenBrightness = 0.01f;
getWindow().setAttributes(lpa);
ViewGroup.LayoutParams lp = mOperationPercent.getLayoutParams();  //这部分是改变图片上面的当前亮度的进度的
lp.width = (int) (findViewById(R.id.operation_full).getLayoutParams().width * lpa.screenBrightness);
mOperationPercent.setLayoutParams(lp);
}

音量调节

/**
* 音量调节
*/
public class MainActivity extends Activity {
private static final String TAG = "MainActivity";
private AudioManager mAudioManager;
private int currentVolume;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mAudioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
// 最大音量
int maxVolume = mAudioManager
.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
Log.i(TAG, "最大音量:" + maxVolume);
currentVolume = mAudioManager
.getStreamVolume(AudioManager.STREAM_MUSIC);
Log.i(TAG, "当前音量:" + currentVolume);
}
public void up(View view) {
// 音量增大
// AudioManager.STREAM_SYSTEM
mAudioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,
AudioManager.ADJUST_RAISE, AudioManager.FX_FOCUS_NAVIGATION_UP);
currentVolume = mAudioManager
.getStreamVolume(AudioManager.STREAM_MUSIC);
Log.i(TAG, "当前音量:" + currentVolume);
}
public void down(View view) {
// 音量减小
mAudioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,
AudioManager.ADJUST_LOWER, AudioManager.FX_FOCUS_NAVIGATION_UP);
currentVolume = mAudioManager
.getStreamVolume(AudioManager.STREAM_MUSIC);
Log.i(TAG, "当前音量:" + currentVolume);
}
}

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