public void onAttachedToWindow(){         this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);            super.onAttachedToWindow(); }

 \frameworks\policies\base\phone\com\android\internal\policy\impl\PhoneWindowManager.java 1089行 if (code == KeyEvent.KEYCODE_HOME) {             // If a system window has focus, then it doesn't make sense            // right now to interact with applications.            WindowManager.LayoutParams attrs = win != null ? win.getAttrs() : null;            if (attrs != null) {                final int type = attrs.type;                if (type == WindowManager.LayoutParams.TYPE_KEYGUARD                        || type == WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG) {                    // the "app" is keyguard, so give it the key                    return false;                }                final int typeCount = WINDOW_TYPES_WHERE_HOME_DOESNT_WORK.length;                for (int i=0; i<typeCount; i++) {                    if (type == WINDOW_TYPES_WHERE_HOME_DOESNT_WORK[i]) {                        // don't do anything, but also don't pass it to the app                        return true;                    }                }            }