最近有個需求： 勾選"永久隱藏工具欄"時，要求導航欄隱藏，狀態欄不隱藏。

一. 源碼中找到/packages/apps/Settings/src/com/android/settings/DisplaySettings.java:

可以看到勾選"永久隱藏工具欄"時發送了個廣播，

@Override
??? public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
??????? if(preference == mSystemBarHide)
?? ?{
?? ???? if(mSystemBarHide.isChecked()){
?? ??? ?Intent i = new Intent("com.cdhx.removebar");
?? ??? ?getActivity().sendBroadcast(i);
?? ???? } else {
?? ??? ?Intent i = new Intent("com.cdhx.addbar");
?? ??? ?getActivity().sendBroadcast(i);
?? ???? }
??????? }
??????? return super.onPreferenceTreeClick(preferenceScreen, preference);
??? }

二. 在/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java：

2.1.找到對應的廣播動作：

else if("com.cdhx.removebar".equals(action)) {
????????????????????? Settings.System.putInt(mContext.getContentResolver(), Settings.System.SYSTEMBAR_HIDE,1);
?????????????????????? mHandler.removeMessages(MSG_CHANGE_BAR_HIDE_STATUS);
?????????????????????? mHandler.sendEmptyMessageDelayed(MSG_CHANGE_BAR_HIDE_STATUS, 400);
??????????? }

2.2.對應的更新UI消息：

case MSG_CHANGE_BAR_HIDE_STATUS:
?????????????????????? changeBarHideStatus();
?????????????????????? break;

找到changeBarHideStatus();

?private void changeBarHideStatus()
??????? {
??????????? boolean hide_systembar = Settings.System.getInt(mContext.getContentResolver(),Settings.System.SYSTEMBAR_HIDE,0)==1;

??????????? if(hide_systembar)
??????????????? removeBar(false);
??????????? else{
??????????????? addBarInside(hide_systembar);? ?
??????????? }
??????? }

三.找到removeBar( ):

private void removeBar(boolean needToast){
??????????????? if (mBarIsAdd){
??????????????????????? Log.d(TAG,"remove Bar");
?? ??? ??? ??? ??? ?if(mContext.getResources().getConfiguration().enableMultiWindow()){
?? ??? ??? ??? ??? ??? ?try {
?? ??? ??? ??? ???????????? mWindowManagerService.changeTitleBar(false);
?? ??? ??? ??? ???????? } catch (RemoteException e) {
?? ??? ??? ??? ???????????? Log.w(TAG, "Error changeTitleBar transition: " + e);
?? ??? ??? ??? ???????? }
?? ??? ??? ??? ??? ???? }
??????????????????????? if (mNavigationBarView != null){
??????????????????????????????? mWindowManager.removeViewImmediate(mNavigationBarView);
?????????????????????? }
?????????????????????? if (!mContext.getResources().getConfiguration().enableMultiWindow()&&mStatusBarWindow != null)
?? ??? ??? ?? ??? ? ?? ??????? mStatusBarWindow.setVisibility(View.GONE);
????????????????????? if(signalCluster_win!=null)
?? ??? ??? ??? ??? ?????? signalCluster_win=null;
?? ??? ??? ??? ??? ?? if (mNavigationBarView != null)
?? ??? ??? ??? ??? ?????? mNavigationBarView = null;
?? ??? ??? ??? ??? ??? ? ?
????????????????????? if(mNotificationLite != null){
?? ??? ??? ???????????? mNotificationLite.closeCenter();
?? ??? ??? ?????????? }
??????????????????????? mBarIsAdd = false;
??????????????????????? if(!isMultiChange)
??????????????????????? Toast.makeText(mContext, mContext.getResources().getString(R.string.hidebar_msg)
, 1000).show();
??????????????? }
??????? }

可以看到如上加厚的狀態欄這句。將其注釋掉，即可實現勾選"永久隱藏工具欄"時，導航欄隱藏而狀態欄不隱藏。

總結

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