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@Override
public void onBackPressed()
 {
    //实现Home键效果
    //super.onBackPressed();这句话一定要注掉,不然又去调用默认的back处理方式了
    Intent intent= new Intent(Intent.ACTION_MAIN);
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    intent.addCategory(Intent.CATEGORY_HOME);
    startActivity(intent);
}

view.bringToFront()
ViewGroup.bringChildToFront(View child)

DisplayMetrics metrics =getResources().getDisplayMetrics();  
int width = metrics.widthPixels;  
int height = metrics.heightPixels;  

int[] locationArr = new int[2];
getLocationOnScreen(locationArr);//x=locationArr[0],y=locationArr[1]
//或者
x = getRawX();
y = getRawY();