android系統捕獲home鍵

@Override
public void onAttachedToWindow() {
// TODO Auto-generated method stub
super.onAttachedToWindow();

this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);

                // 若用this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);則背景會變黑

}