Question

在我的应用程序中，在某些活动下必须保持屏幕始终处于活动状态（经典keepScreenOn）。

为了减少一点电池消耗，我想实现一个节能系统（类似于默认）类型：

在不活动10秒后，亮度降至最低（没有发送活动暂停或类似）点击亮度恢复正常等等...

可以实现这样的系统吗？有一种自动计算空闲时间的方法吗？（因为否则我会创建一个从10到0的冷却，向每个用户点击10个......）

非常感谢

Answer 1

尝试使用Settings.System.SCREEN_BRIGHTNESS将系统默认亮度设置为：

＆＃13;

android.provider.Settings.System.putInt(getContentResolver(),  
android.provider.Settings.System.SCREEN_BRIGHTNESS,brightness /100.0f); // 0-255

＆＃13;

并在清单中添加这些权限：

＆＃13;

<uses-permission android:name="android.permission.CHANGE_CONFIGURATION" />
<uses-permission android:name="android.permission.WRITE_SETTINGS" />

＆＃13;

Answer 2

我认为可以使用WindowManager.LayoutParams：

WindowManager.LayoutParams layoutParams = getWindow().getAttributes();
layoutParams.screenBrightness = 1F; // or whatever, but a float
getWindow().setAttributes(layoutParams);

值范围从0（暗）到1（亮）。低于0的值将重置默认的android值。

Answer 3

使用TimerTask来处理时间

使用

@Override
public void onUserInteraction() {
    // TODO Auto-generated method stub
    super.onUserInteraction();

    Log.d(TRCU.LOG_TAG,"User Interaction : "+userInteractionTimeout);

}

获取用户互动事件

您也可以使用

调整亮度

         // Update brightness Instantly
         WindowManager.LayoutParams lp =((Activity) context).getWindow().getAttributes();
         lp.screenBrightness =mCurrentValue/ 255.0f;

         ((Activity) context).getWindow().setAttributes(lp);

Answer 4

首先在manifest.xml文件中写下以下权限

<uses-permission android:name="android.permission.WRITE_SETTINGS" />

然后，当 10秒过去时，运行以下代码将设备的亮度降低到它的较低级别：

Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, 0); //Set the system brightness
android.view.WindowManager.LayoutParams w_lp = getWindow().getAttributes(); //Get the current window attributes
w_lp.screenBrightness = progress / (float)255; //Set the brightness of this window
getWindow().setAttributes(w_lp); //Apply attribute changes to this window

如果您需要知道如何确保等待 10秒而没有任何用户活动，请按以下方式实施上述代码：

public class YOUR_ACTIVITY extends Activity {

public static int x = 0; // must be static

@Override
protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       run_thread();
}

private void run_thread(){
    Thread thread = new Thread(new Runnable() {

        @Override
        public void run() {
            while(x < 10){
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                x++;
            }

    Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, 0); //Set the system brightness to it's lowest value
    android.view.WindowManager.LayoutParams w_lp = getWindow().getAttributes(); //Get the current window attributes
    w_lp.screenBrightness = progress / (float)255; //Set the brightness of this window
    getWindow().setAttributes(w_lp); //Apply attribute changes to this window

        }
    });
    thread.start();
}


@Override 
public boolean onTouchEvent(MotionEvent event) {
    x = 0;

    Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, 255); //Set the system brightness back to it's full value
    android.view.WindowManager.LayoutParams w_lp = getWindow().getAttributes(); //Get the current window attributes
    w_lp.screenBrightness = progress / (float)255; //Set the brightness of this window
    getWindow().setAttributes(w_lp); //Apply attribute changes to this window

    return true;
}

减少活动屏幕灯

4 个答案: