App快速实现“哀悼主题”方案
全局设置灰白模式：
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Paint paint = new Paint();
ColorMatrix cm = new ColorMatrix();
cm.setSaturation(0);//灰度效果
paint.setColorFilter(new ColorMatrixColorFilter(cm));
getWindow().getDecorView().setLayerType(View.LAYER_TYPE_HARDWARE,paint);
}
创建一个置灰的管理类
public class GrayManager {
private static GrayManager mInstance;
private Paint mGrayPaint;
private ColorMatrix mGrayMatrix;
public static GrayManager getInstance() {
if (mInstance == null) {
synchronized (GrayManager.class) {
if (mInstance == null) {
mInstance = new GrayManager();
}
}
}
return mInstance;
}
//初始化
public void init() {
mGrayMatrix = new ColorMatrix();
mGrayPaint = new Paint();
mGrayMatrix.setSaturation(0);
mGrayPaint.setColorFilter(new ColorMatrixColorFilter(mGrayMatrix));
}
//硬件加速置灰方法
public void setLayerGrayType(View view) {
if (mGrayMatrix == null || mGrayPaint == null) {
init();
}
view.setLayerType(View.LAYER_TYPE_HARDWARE, mGrayPaint);
//view.setLayerType(View.LAYER_TYPE_SOFTWARE, mGrayPaint); 不能用硬件加速的方法
}
}
特殊控件需要置灰的话直接调用setLayerGrayType()方法将view传进去，比如demo中让某个Activity置灰，那就在Activity里面调用
GrayManager.getInstance().setLayerGrayType(getWindow().getDecorView());
