看看源码是怎样处理的 \frameworks\policies\base\phone\com\android\internal\policy\impl\PhoneWindowManager.java #1092
Java代码
// First we always handle the home key here, so applications // can never break it, although if keyguard is on, we do let // it handle it, because that gives us the correct 5 second // timeout. 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; } } }