Android(安卓)8.1 中Systemui中的常见修改（五）长按Home键唤起Google Now

Android默认处理长按Home键会唤起最近使用应用列表，而部分厂商在安装了GMS后，Google会要求修改长按Home键唤起Google Now

修改frameworks/base/core/res/res/values/Config.xml

注：这里的值可以设置三个，1代表唤起recent app界面；2代表唤起搜索界面（Google Now)；3代表Nothing

我们在看处理方法：

frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarFragment.java

    @VisibleForTesting    boolean onHomeLongClick(View v) {        if (shouldDisableNavbarGestures()) {            return false;        }        MetricsLogger.action(getContext(), MetricsEvent.ACTION_ASSIST_LONG_PRESS);        mAssistManager.startAssist(new Bundle() /* args */);        mStatusBar.awakenDreams();        if (mNavigationBarView != null) {            mNavigationBarView.abortCurrentGesture();        }        return true;    }

实际上是在下面的方法中进行处理的

frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java

 // These need to match the documentation/constant in // core/res/res/values/config.xml static final int LONG_PRESS_HOME_NOTHING = 0; static final int LONG_PRESS_HOME_ALL_APPS = 1; static final int LONG_PRESS_HOME_ASSIST = 2; static final int LAST_LONG_PRESS_HOME_BEHAVIOR = LONG_PRESS_HOME_ASSIST;    //通过下面的方法读取config.xml文件中的相应值去对比，确定长按home按键的行为。    /**     * Read values from config.xml that may be overridden depending on     * the configuration of the device.     * eg. Disable long press on home goes to recents on sw600dp.     */    private void readConfigurationDependentBehaviors() {        final Resources res = mContext.getResources();        mLongPressOnHomeBehavior = res.getInteger(                com.android.internal.R.integer.config_longPressOnHomeBehavior);        if (mLongPressOnHomeBehavior < LONG_PRESS_HOME_NOTHING ||                mLongPressOnHomeBehavior > LAST_LONG_PRESS_HOME_BEHAVIOR) {            mLongPressOnHomeBehavior = LONG_PRESS_HOME_NOTHING;        }        mDoubleTapOnHomeBehavior = res.getInteger(                com.android.internal.R.integer.config_doubleTapOnHomeBehavior);        if (mDoubleTapOnHomeBehavior < DOUBLE_TAP_HOME_NOTHING ||                mDoubleTapOnHomeBehavior > DOUBLE_TAP_HOME_RECENT_SYSTEM_UI) {            mDoubleTapOnHomeBehavior = LONG_PRESS_HOME_NOTHING;        }        mShortPressWindowBehavior = SHORT_PRESS_WINDOW_NOTHING;        if (mContext.getPackageManager().hasSystemFeature(FEATURE_PICTURE_IN_PICTURE)) {            mShortPressWindowBehavior = SHORT_PRESS_WINDOW_PICTURE_IN_PICTURE;        }        mNavBarOpacityMode = res.getInteger(                com.android.internal.R.integer.config_navBarOpacityMode);    }   //长按的处理办法    private void handleLongPressOnHome(int deviceId) {        if (mLongPressOnHomeBehavior == LONG_PRESS_HOME_NOTHING) {            return;        }        mHomeConsumed = true;        performHapticFeedbackLw(null, HapticFeedbackConstants.LONG_PRESS, false);        switch (mLongPressOnHomeBehavior) {            case LONG_PRESS_HOME_ALL_APPS:                launchAllAppsAction();                break;            case LONG_PRESS_HOME_ASSIST:                launchAssistAction(null, deviceId);                break;            default:                Log.w(TAG, "Undefined home long press behavior: " + mLongPressOnHomeBehavior);                break;        }    }    private void launchAllAppsAction() {        Intent intent = new Intent(Intent.ACTION_ALL_APPS);        if (mHasFeatureLeanback) {            final PackageManager pm = mContext.getPackageManager();            Intent intentLauncher = new Intent(Intent.ACTION_MAIN);            intentLauncher.addCategory(Intent.CATEGORY_HOME);            ResolveInfo resolveInfo = pm.resolveActivityAsUser(intentLauncher,                    PackageManager.MATCH_SYSTEM_ONLY,                    mCurrentUserId);            if (resolveInfo != null) {                intent.setPackage(resolveInfo.activityInfo.packageName);            }        }        startActivityAsUser(intent, UserHandle.CURRENT);    }

最后在插播一句，处理home按键的最初方法是

 @Override    public long interceptKeyBeforeDispatching(WindowState win, KeyEvent event, int policyFlags) {}

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