在 android like twilight 应用程序上添加调光器并更改屏幕亮度
Add a dimmer and change screen brightness on android like twilight app
我想在设备屏幕上添加一个调光器并像 twilight app
一样过滤光通量
结果如下所示:
我正在寻找实现它的 API、示例代码或文档。目前,我只知道如何在 android.
上以编程方式更改亮度
有什么建议吗?
要实现此结果,您需要创建一个 window,使用类型 TYPE_SYSTEM_ALERT
并将其显示在所有其他应用程序之上。为此,您需要权限 SYSTEM_ALERT_WINDOW:
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
然后创建一个具有所需背景颜色的新布局:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FF4081"
android:orientation="vertical">
</LinearLayout>
还有一个Service
:
public class DrawOverAppsService extends Service {
public static final String TAG = "DrawOverAppsService";
private View mOverlayView;
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
super.onCreate();
Log.d(TAG, "onCreate");
WindowManager.LayoutParams params = new WindowManager.LayoutParams(
WindowManager.LayoutParams.MATCH_PARENT,
WindowManager.LayoutParams.MATCH_PARENT,
WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |
WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL |
WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN |
WindowManager.LayoutParams.FLAG_DIM_BEHIND,
PixelFormat.TRANSLUCENT);
// An alpha value to apply to this entire window.
// An alpha of 1.0 means fully opaque and 0.0 means fully transparent
params.alpha = 0.1F;
// When FLAG_DIM_BEHIND is set, this is the amount of dimming to apply.
// Range is from 1.0 for completely opaque to 0.0 for no dim.
params.dimAmount = 0.8F;
WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mOverlayView = inflater.inflate(R.layout.overlay_view, null);
wm.addView(mOverlayView, params);
}
@Override
public void onDestroy() {
super.onDestroy();
Log.d(TAG, "onDestroy");
WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
wm.removeView(mOverlayView);
}
}
要显示叠加层,请启动服务:
Intent intent = new Intent(this, DrawOverAppsService.class);
startService(intent);
并停止覆盖:
Intent intent = new Intent(this, DrawOverAppsService.class);
stopService(intent);
我想在设备屏幕上添加一个调光器并像 twilight app
一样过滤光通量
结果如下所示:
我正在寻找实现它的 API、示例代码或文档。目前,我只知道如何在 android.
上以编程方式更改亮度
有什么建议吗?
要实现此结果,您需要创建一个 window,使用类型 TYPE_SYSTEM_ALERT
并将其显示在所有其他应用程序之上。为此,您需要权限 SYSTEM_ALERT_WINDOW:
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
然后创建一个具有所需背景颜色的新布局:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FF4081"
android:orientation="vertical">
</LinearLayout>
还有一个Service
:
public class DrawOverAppsService extends Service {
public static final String TAG = "DrawOverAppsService";
private View mOverlayView;
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
super.onCreate();
Log.d(TAG, "onCreate");
WindowManager.LayoutParams params = new WindowManager.LayoutParams(
WindowManager.LayoutParams.MATCH_PARENT,
WindowManager.LayoutParams.MATCH_PARENT,
WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |
WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL |
WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN |
WindowManager.LayoutParams.FLAG_DIM_BEHIND,
PixelFormat.TRANSLUCENT);
// An alpha value to apply to this entire window.
// An alpha of 1.0 means fully opaque and 0.0 means fully transparent
params.alpha = 0.1F;
// When FLAG_DIM_BEHIND is set, this is the amount of dimming to apply.
// Range is from 1.0 for completely opaque to 0.0 for no dim.
params.dimAmount = 0.8F;
WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mOverlayView = inflater.inflate(R.layout.overlay_view, null);
wm.addView(mOverlayView, params);
}
@Override
public void onDestroy() {
super.onDestroy();
Log.d(TAG, "onDestroy");
WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
wm.removeView(mOverlayView);
}
}
要显示叠加层,请启动服务:
Intent intent = new Intent(this, DrawOverAppsService.class);
startService(intent);
并停止覆盖:
Intent intent = new Intent(this, DrawOverAppsService.class);
stopService(intent);