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我想根据光线改变屏幕的亮度..

我找到了获取亮度级别和设置亮度的链接..

在暂停时更改屏幕亮度（Android 应用）

如何打开和关闭自动亮度？（不重复）

在android中以编程方式更改屏幕亮度

以编程方式更改屏幕亮度（与电源小部件一样）

但我想根据周围的光线改变亮度..简而言之，我想做和自动亮度一样的工作..

如何检测周围的光线？或者我可以触发自动亮度功能吗？

亮度的值范围在 0 到 255 之间。我想根据周围的光线水平设置亮度级别，不能是 0 到 255。我怎样才能得到这两者之间的比率。

需要帮助。谢谢

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1 回答 1

6

我自己的解决方案：

我从这里实现了摇动监听器。我也使用了 aboce 链接来完成它。

我创建了ShakeBrightService.java

public class ShakeBrightService extends Service {

private ShakeDetector shakeBrightDetector = new ShakeDetector();

@Override
public void onCreate() {
    super.onCreate();

}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {

    shakeBrightDetector.stop();
    shakeBrightDetector.start(this, shakeBrightEventListener);

    return super.onStartCommand(intent, flags, startId);
}

private ShakeEventListener shakeBrightEventListener = new ShakeEventListener() {

    @Override
    public void onShake() {
        setAutoBrightness(true);
    }
};

@Override
public IBinder onBind(Intent intent) {
    return null;
}

private void setAutoBrightness(boolean value) {

    Toast.makeText(getApplicationContext(), "AutoBrightness : " + value,
            Toast.LENGTH_SHORT).show();

    if (value) {

        Settings.System.putInt(getContentResolver(),
                Settings.System.SCREEN_BRIGHTNESS_MODE,
                Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC);
    } else {

        Settings.System.putInt(getContentResolver(),
                Settings.System.SCREEN_BRIGHTNESS_MODE,
                Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
    }

    Intent i = new Intent(getApplicationContext(), MainActivity1.class);
    i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(i);   
}

}

用于刷新视图
MainActivity1.java的假

public class MainActivity1 extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.activity_main1);

    refreshBrightness(getBrightnessLevel());

    Thread t = new Thread() {
        public void run() {
            try {
                sleep(10);
            } catch (InterruptedException e) {
            }
            finish();
        }
    };
    t.start();
}

private void refreshBrightness(float brightness) {

    WindowManager.LayoutParams lp = getWindow().getAttributes();
    if (brightness < 0) {
        lp.screenBrightness = WindowManager.LayoutParams.BRIGHTNESS_OVERRIDE_NONE;
    } else {
        lp.screenBrightness = brightness;
    }
    getWindow().setAttributes(lp);
}

int getBrightnessLevel() {
    try {
        int value = Settings.System.getInt(getContentResolver(),
                Settings.System.SCREEN_BRIGHTNESS);
        // convert brightness level to range 0..1
        value = value / 255;
        return value;
    } catch (SettingNotFoundException e) {
        return 0;
    }
}

FakeActivity 有主题android:theme="@android:style/Theme.Translucent.NoTitleBar"，所以默默地改变了亮度。

于 2013-01-01T14:11:56.667 回答