【Android】Android处理Home键方法小结

实验几次之后（android4.1 和android4.2）发现在单个的activity里面有以下几个方法可以使用：

方法1：onSaveInstanceState方法

下面这个方法可以处理home的监听问题。

Java代码

protected void onSaveInstanceState(Bundle outState)

但这个方法不是很好，不推荐

方法2：onUserLeaveHint方法

Java代码

@Override
    protected void onUserLeaveHint() {
        Log.d("aeon","onUserLeaveHint");
        super.onUserLeaveHint();
    }

这个方法会在onSaveInstanceState之前执行，根据api的解释，这个方法还比较合适的。

方法3：ACTION_CLOSE_SYSTEM_DIALOGS

在使用广播监听方面可以使用ACTION_CLOSE_SYSTEM_DIALOGS

Java代码

//注册Receiver
 HomeKeyEventBroadCastReceiver receiver = new HomeKeyEventBroadCastReceiver();
 registerReceiver(receiver, new IntentFilter(
                           Intent. ACTION_CLOSE_SYSTEM_DIALOGS));

方法4：framework PhoneWindowManager.java 处理

想要完全监听home键需要在framework层去处理。

/frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java

里面去修改private void handleLongPressOnHome() 这个方法。

Java代码

private void handleLongPressOnHome() {
        // We can't initialize this in init() since the configuration hasn't been loaded yet.
        if (mLongPressOnHomeBehavior < 0) {
            mLongPressOnHomeBehavior
                    = mContext.getResources().getInteger(R.integer.config_longPressOnHomeBehavior);
            if (mLongPressOnHomeBehavior < LONG_PRESS_HOME_NOTHING ||
                    mLongPressOnHomeBehavior > LONG_PRESS_HOME_RECENT_SYSTEM_UI) {
                mLongPressOnHomeBehavior = LONG_PRESS_HOME_NOTHING;
            }
        }

        if (mLongPressOnHomeBehavior != LONG_PRESS_HOME_NOTHING) {
            performHapticFeedbackLw(null, HapticFeedbackConstants.LONG_PRESS, false);
            sendCloseSystemWindows(SYSTEM_DIALOG_REASON_RECENT_APPS);

            // Eat the longpress so it won't dismiss the recent apps dialog when
            // the user lets go of the home key
            mHomeLongPressed = true;
        }

        if (mLongPressOnHomeBehavior == LONG_PRESS_HOME_RECENT_DIALOG) {
            showOrHideRecentAppsDialog(RECENT_APPS_BEHAVIOR_SHOW_OR_DISMISS);
        } else if (mLongPressOnHomeBehavior == LONG_PRESS_HOME_RECENT_SYSTEM_UI) {
            try {
                IStatusBarService statusbar = getStatusBarService();
                if (statusbar != null) {
                    statusbar.toggleRecentApps();
                }
            } catch (RemoteException e) {
                Slog.e(TAG, "RemoteException when showing recent apps", e);
                // re-acquire status bar service next time it is needed.
                mStatusBarService = null;
            }
        }
    }