功能实现
这里主要通过WindowManager添加一个view ，然后通过控制view的背景颜色来实现护眼
mWindowManager = (WindowManager) this.getSystemService(Context.WINDOW_SERVICE);
view = new FrameLayout(this);
view.setBackgroundColor(Color.TRANSPARENT);
WindowManager.LayoutParams params = new WindowManager.LayoutParams();
params.type = WindowManager.LayoutParams.TYPE_SYSTEM_ERROR ;//显示在所有内容之上
params.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL//即使在该window在可获得焦点情况下，仍然把该window之外的任何event发送到该window之后的其他window.
| WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE//让window不能获得焦点，这样用户快就不能向该window发送按键事件及按钮事件
| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE;//让该window不接受触摸屏事件
params.format = PixelFormat.TRANSLUCENT;//window透明
params.width = WindowManager.LayoutParams.MATCH_PARENT;//全屏
params.height = WindowManager.LayoutParams.MATCH_PARENT;
mWindowManager.addView(view,params);
护眼和不护眼
/**
* 开启护眼模式
*/
public void openEye() {
view.setBackgroundColor(getFilterColor(30));
}
/**
* 关闭护眼模式
*/
public void closeEye() {
view.setBackgroundColor(Color.TRANSPARENT);
mWindowManager.removeViewImmediate(view);
}
过滤蓝光的主要方法
/**
* 过滤蓝光
*
* @param blueFilterPercent 蓝光过滤比例[10-30-80]
*/
public int getFilterColor(int blueFilterPercent) {
int realFilter = blueFilterPercent;
if (realFilter < 10) {
realFilter = 10;
} else if (realFilter > 80) {
realFilter = 80;
}
int a = (int) (realFilter / 80f * 180);
int r = (int) (200 - (realFilter / 80f) * 190);
int g = (int) (180 - (realFilter / 80f) * 170);
int b = (int) (60 - realFilter / 80f * 60);
return Color.argb(a, r, g, b);
}
然后主要是service启动时开启护眼模式，service停止时关闭护眼模式
@Override
public void onDestroy() {
super.onDestroy();
closeEye();
}
然后我们可以在SettingsProvider添加护眼模式的默认属性值，这里默认关闭
<bool name="def_eyeshield_mode">false</bool>
然后要在frameworks\base\core\java\android\provider\Settings.java中定义这个全局变量EYESHIELD_MODE
public static final String EYESHIELD_MODE = "eyeshield_mode";//护眼模式
然后frameworks\base\packages\SettingsProvider\src\com\android\providers\settings\DatabaseHelper.java的loadGlobalSettings方法中load
loadBooleanSetting(stmt, Settings.Global.EYESHIELD_MODE,
R.bool.def_eyeshield_mode);
在设置中添加开关就是根据上面def_eyeshield_mode值来的 具体怎么添加可以参考我之前的文章一个基于Android 7.1 基于Android 7.1在Setting中增加开关 还有基于 4.4 基于Android 4.4 Settings增加开关
然后我们在\frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\phone\StatusBar.java的start方法中
注册观察者来监听
mContext.getContentResolver().registerContentObserver(
Settings.Global.getUriFor(Settings.Global.EYESHIELD_MODE), false,
mEyeshieldObserver);
private final ContentObserver mEyeshieldObserver = new ContentObserver(mHandler) {
@Override
public void onChange(boolean selfChange) {
Intent intent =new Intent();
intent.setComponent(new ComponentName("com.android.systemui", "com.android.systemui.statusbar.service.EyeShieldService"));//这样不用导包
final Boolean mode = Settings.Global.getInt(mContext.getContentResolver(),
Settings.Global.EYESHIELD_MODE, 0)!=0;
if(mode){
Log.e("Eyeshield"," [start-EyeShieldService] ");
mContext.startService(intent);
}else{
Log.e("Eyeshield"," [stop-EyeShieldService] ");
mContext.stopService(intent);
}
}
};
这里要调用一下观察者的onChange方法，否则开机时不会调用到
mEyeshieldObserver.onChange(false); // set up
这样的话 设置中只需要改变值即可 如下所示
Settings.Global.putInt(appActivity.getContentResolver(),
Settings.Global.EYESHIELD_MODE, 0);
Settings.Global.putInt(appActivity.getContentResolver(),
Settings.Global.EYESHIELD_MODE, 1);
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