对话框屏蔽home
对话框屏蔽home
alert.show();
alert.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);


activity屏蔽home
@Override
public void onAttachedToWindow() {
this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
super.onAttachedToWindow();
}