版权声明：本文出自cczheng的博客，转载必须注明出处。 https://blog.csdn.net/u012932409/article/details/89156391
之前写过一遍6.0的导航栏屏蔽分析过程，可参考Android6.0 源码修改之屏蔽导航栏虚拟按键（Home和RecentAPP）/动态显示和隐藏NavigationBar
屏蔽状态栏下拉
6.0解决办法
源码位置 SystemUI\src\com\android\systemui\statusbar\phone\PhoneStatusBarView.java
@Override
public boolean onTouchEvent(MotionEvent event) {
boolean barConsumedEvent = mBar.interceptTouchEvent(event);
if (DEBUG_GESTURES) {
if (event.getActionMasked() != MotionEvent.ACTION_MOVE) {
EventLog.writeEvent(EventLogTags.SYSUI_PANELBAR_TOUCH,
event.getActionMasked(), (int) event.getX(), (int) event.getY(),
barConsumedEvent ? 1 : 0);
}
}
// return barConsumedEvent || super.onTouchEvent(event);
return false;
}
直接返回false，action_move不会执行，代码看似简单，实则super.onTouchEvent(event)调用的是PanelBar.java中的onTouchEvent()
8.1解决办法（同上）
6.0和8.1的状态栏代码是有差异的，但是通过上面的方法都能达到需求效果
6.0的PhoneStatusBarView调用onTouchEvent()，最终调用PanelBar的onTouchEvent()
8.1的PhoneStatusBarView调用onTouchEvent()，接着调用PanelBar的onTouchEvent()，最终调用PanelView的onTouchEvent()
从根本上阻止事件的传递来达到屏蔽下拉的效果
补充
如果需要动态的控制是否允许下拉状态栏，可以通过广播通知，接受传递的参数，持久化保存(可通过SharedPreference或者Settings.Global.xxxx)当前状态栏的状态，一般建议采用Settings.Global保存。
具体步骤
- 在frameworks\base\core\java\android\provider\Settings.java中Globel内部类下添加变量名称，比如OPEN_PANEL_ENABLED
- 通过make update-api指令重新编译，因为在Settings中修改后需要编译才能对应到这两文件frameworks/base/api/system-current.txt、frameworks/base/api/current.txt
- 在广播接收的地方通过Settings.Global.putInt(context.getContentResolver(), Settings.Global.OPEN_PANEL_ENABLED, 1) 保存值
（ps 可通过adb命令 adb shell settings put global open_panel_enabled 1 模拟写入 adb shell settings get global open_panel_enabled 模拟查看） - 将刚刚的return false改成
boolean flag=Settings.Global.getInt(getContext().getContentResolver(), Settings.Global.OPEN_PANEL_ENABLED,1)==1;
return flag ? barConsumedEvent || super.onTouchEvent(event) : flag;
屏蔽导航栏显示
6.0解决办法
源码位置SystemUI\src\com\android\systemui\statusbar\phone\PhoneStatusBar.java
@Override
public void start() {
mDisplay = ((WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE))
.getDefaultDisplay();
updateDisplaySize();
mScrimSrcModeEnabled = mContext.getResources().getBoolean(
R.bool.config_status_bar_scrim_behind_use_src);
super.start(); // calls createAndAddWindows()
mMediaSessionManager
= (MediaSessionManager) mContext.getSystemService(Context.MEDIA_SESSION_SERVICE);
// TODO: use MediaSessionManager.SessionListener to hook us up to future updates
// in session state
addNavigationBar();
.....
}
直接注释addNavigationBar()就能达到需求效果
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8.1解决办法
源码位置SystemUI\src\com\android\systemui\statusbar\phone\StatusBar.java
protected void makeStatusBarView() {
final Context context = mContext;
updateDisplaySize(); // populates mDisplayMetrics
updateResources();
updateTheme();
....
try {
boolean showNav = mWindowManagerService.hasNavigationBar();
if (DEBUG) Log.v(TAG, "hasNavigationBar=" + showNav);
if (showNav) {
createNavigationBar();
}
} catch (RemoteException ex) {
// no window manager? good luck with that
}
....
}
直接注释createNavigationBar()或者将showNav=false就能达到需求效果
代码流程分析
6.0和8.1的导航栏都是通过WindowManager的addView来添加的，通过WindowManager的removeViewImmediate来移除
1、6.0的addNavigationBar实现，通过addView将mNavigationBarView添加，prepareNavigationBarView方法设置了点击、触摸、长按事件，无需关心
private void addNavigationBar() {
if (DEBUG) Log.v(TAG, "addNavigationBar: about to add " + mNavigationBarView);
if (mNavigationBarView == null) return;
prepareNavigationBarView();
mWindowManager.addView(mNavigationBarView, getNavigationBarLayoutParams());
mNavigationShown=true;
}
查找到在makeStatusBarView()中，mNavigationBarView初始化,加载navigation_bar布局文件
protected PhoneStatusBarView makeStatusBarView() {
final Context context = mContext;
Resources res = context.getResources();
updateDisplaySize(); // populates mDisplayMetrics
updateResources();
...
mNavigationBarView = (NavigationBarView) View.inflate(context, R.layout.navigation_bar, null);
mNavigationBarView.setDisabledFlags(mDisabled1);
mNavigationBarView.setBar(this);
mNavigationBarView.setOnVerticalChangedListener(
new NavigationBarView.OnVerticalChangedListener() {
@Override
public void onVerticalChanged(boolean isVertical) {
if (mAssistManager != null) {
mAssistManager.onConfigurationChanged();
}
mNotificationPanel.setQsScrimEnabled(!isVertical);
}
});
mNavigationBarView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
checkUserAutohide(v, event);
return false;
}});
}
2、8.1的createNavigationBar实现，发现是通过NavigationBarFragment来实例化mNavigationBarView
protected void createNavigationBar() {
mNavigationBarView = NavigationBarFragment.create(mContext, (tag, fragment) -> {
mNavigationBar = (NavigationBarFragment) fragment;
if (mLightBarController != null) {
mNavigationBar.setLightBarController(mLightBarController);
}
mNavigationBar.setCurrentSysuiVisibility(mSystemUiVisibility);
});
}
NavigationBarFragment的crate方法通过addView将mNavigationBarView添加，加载navigation_bar_window布局
public static View create(Context context, FragmentListener listener) {
WindowManager.LayoutParams lp = new WindowManager.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT,
WindowManager.LayoutParams.TYPE_NAVIGATION_BAR,
WindowManager.LayoutParams.FLAG_TOUCHABLE_WHEN_WAKING
| WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
| WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH
| WindowManager.LayoutParams.FLAG_SPLIT_TOUCH
| WindowManager.LayoutParams.FLAG_SLIPPERY,
PixelFormat.TRANSLUCENT);
lp.token = new Binder();
lp.setTitle("NavigationBar");
lp.windowAnimations = 0;
View navigationBarView = LayoutInflater.from(context).inflate(
R.layout.navigation_bar_window, null);
if (DEBUG) Log.v(TAG, "addNavigationBar: about to add " + navigationBarView);
if (navigationBarView == null) return null;
context.getSystemService(WindowManager.class).addView(navigationBarView, lp);
FragmentHostManager fragmentHost = FragmentHostManager.get(navigationBarView);
NavigationBarFragment fragment = new NavigationBarFragment();
fragmentHost.getFragmentManager().beginTransaction()
.replace(R.id.navigation_bar_frame, fragment, TAG)
.commit();
fragmentHost.addTagListener(TAG, listener);
return navigationBarView;
}
补充
依旧是通过广播来动态控制导航栏的显示和隐藏
6.0已在开头文章中写过，这里就只补充8.1的显示和隐藏
源码位置SystemUI\src\com\android\systemui\statusbar\phone\StatusBar.java
private static final String SHOW_NAVIGATION = "cc.intent.systemui.shownavigation";
private static final String HIDE_NAVIGATION = "cc.intent.systemui.hidenavigation";
private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
Log.e(TAG, "onReceive: " + intent);
String action = intent.getAction();
if (HIDE_NAVIGATION.equals(action)) {
if (mNavigationBarView == null) return;
mWindowManager.removeViewImmediate(mNavigationBarView);
mNavigationBarView = null;
}else if (SHOW_NAVIGATION.equals(action)) {
if (mNavigationBarView != null) return;
createNavigationBar();
}
}
};