Migration and debugging of the Android system ---> how to modify the volume on the status bar of an Android device and hide the value when switching between the portrait and horizontal screens

Source: Internet
Author: User

In the past two days, due to a customer's requirement, the volume key on the status bar of the MID portrait screen is removed. So I tried to modify it, succeeded, and shared my experience.

Take a look at the modified one, as shown below.

Horizontal screen: there is a volume plus or minus key

Portrait screen: The volume plus or minus key is removed






Then let's talk about my solution.


First I checked the \ mx0831-0525 \ frameworks \ base \ packages \ systemui \ res \ Layout \ system_bar.xml File

<?xml version="1.0" encoding="utf-8"?><!-- * Copyright (C) 2010 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License.--><!-- TabletStatusBarView extends FrameLayout --><com.android.systemui.statusbar.tablet.TabletStatusBarView    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:systemui="http://schemas.android.com/apk/res/com.android.systemui"    android:background="@drawable/system_bar_background"    >        <FrameLayout        android:id="@+id/bar_contents_holder"        android:layout_width="match_parent"        android:layout_height="@*android:dimen/system_bar_height"        android:layout_gravity="bottom"        >        <RelativeLayout            android:id="@+id/bar_contents"            android:layout_width="match_parent"            android:layout_height="match_parent"            android:clipChildren="false"            >            <!-- notification icons & panel access -->            <include layout="@layout/system_bar_notification_area"                 android:layout_width="wrap_content"                android:layout_height="match_parent"                android:layout_alignParentRight="true"                android:layout_marginTop="1dp"                />            <!-- navigation controls -->            <LinearLayout                android:id="@+id/navigationArea"                android:layout_width="wrap_content"                android:layout_height="match_parent"                android:layout_alignParentLeft="true"                android:orientation="horizontal"                android:clipChildren="false"                android:clipToPadding="false"                >                <com.android.systemui.statusbar.policy.KeyButtonView android:id="@+id/back"                    android:layout_width="@dimen/navigation_key_width"                    android:layout_height="match_parent"                    android:src="@drawable/ic_sysbar_back"                    systemui:keyCode="4"                    android:contentDescription="@string/accessibility_back"                    systemui:glowBackground="@drawable/ic_sysbar_highlight"                    />                <com.android.systemui.statusbar.policy.KeyButtonView android:id="@+id/home"                    android:layout_width="@dimen/navigation_key_width"                    android:layout_height="match_parent"                    android:src="@drawable/ic_sysbar_home"                    systemui:keyCode="3"                    android:contentDescription="@string/accessibility_home"                    systemui:glowBackground="@drawable/ic_sysbar_highlight"                    />                <com.android.systemui.statusbar.policy.KeyButtonView android:id="@+id/recent_apps"                    android:layout_width="@dimen/navigation_key_width"                    android:layout_height="match_parent"                    android:src="@drawable/ic_sysbar_recent"                    android:contentDescription="@string/accessibility_recent"                    systemui:glowBackground="@drawable/ic_sysbar_highlight"                    />               <com.android.systemui.statusbar.policy.KeyButtonView android:id="@+id/sub"                                 android:background="@drawable/sub_normal"                     android:layout_width="70dip"                     android:layout_height="match_parent"                     android:visibility="invisible"     systemui:glowBackground="@drawable/ic_sysbar_highlight"                     systemui:keyCode="25"                     />  <com.android.systemui.statusbar.policy.KeyButtonView android:id="@+id/add"                                android:background="@drawable/add_normal"                     android:layout_width="70dip"     android:layout_height="match_parent"                     android:visibility="invisible"                     systemui:glowBackground="@drawable/ic_sysbar_highlight"                     systemui:keyCode="24"                     />     <com.android.systemui.statusbar.policy.KeyButtonView android:id="@+id/screenshot"                    android:layout_width="@dimen/navigation_key_width"                    android:layout_height="match_parent"                    android:src="@drawable/ic_sysbar_screenshot"                    android:contentDescription="@string/accessibility_screenshot"                    systemui:glowBackground="@drawable/ic_sysbar_highlight"                    />                 <com.android.systemui.statusbar.policy.KeyButtonView android:id="@+id/menu"                    android:layout_width="@dimen/navigation_menu_key_width"                    android:layout_height="match_parent"                    android:src="@drawable/ic_sysbar_menu"                    systemui:keyCode="82"                    android:visibility="invisible"                    android:contentDescription="@string/accessibility_menu"                    systemui:glowBackground="@drawable/ic_sysbar_highlight"                    />            </LinearLayout>            <!-- fake space bar zone -->            <com.android.systemui.statusbar.policy.EventHole android:id="@+id/fake_space_bar"                android:layout_height="match_parent"                android:layout_width="0dp"                android:paddingLeft="8dip"                android:paddingRight="8dip"                android:layout_toRightOf="@+id/navigationArea"                android:layout_toLeftOf="@+id/notificationArea"                android:visibility="gone"                />        </RelativeLayout>    </FrameLayout>    <FrameLayout        android:id="@+id/bar_shadow_holder"        android:layout_width="match_parent"        android:layout_height="@*android:dimen/system_bar_height"        android:layout_gravity="bottom"        >        <!-- lights out shade -->        <RelativeLayout            android:id="@+id/bar_shadow"            android:layout_width="match_parent"            android:layout_height="match_parent"            android:background="#FF000000"            android:visibility="gone"            >            <ImageView                android:id="@+id/dot0"                android:layout_width="80dip"                android:layout_height="48dip"                android:src="@drawable/ic_sysbar_lights_out_dot_small"                android:layout_alignParentLeft="true"                android:layout_alignParentBottom="true"                />            <ImageView                android:id="@+id/dot1"                android:layout_width="80dip"                android:layout_height="48dip"                android:src="@drawable/ic_sysbar_lights_out_dot_large"                android:layout_toRightOf="@+id/dot0"                android:layout_alignParentBottom="true"                />            <ImageView                android:id="@+id/dot2"                android:layout_width="80dip"                android:layout_height="48dip"                android:src="@drawable/ic_sysbar_lights_out_dot_small"                android:layout_toRightOf="@+id/dot1"                android:layout_alignParentBottom="true"                />            <ImageView                android:id="@+id/dot3"                android:layout_width="80dip"                android:layout_height="48dip"                android:src="@drawable/ic_sysbar_lights_out_dot_small"                android:layout_alignParentRight="true"                android:layout_alignParentBottom="true"                />        </RelativeLayout>    </FrameLayout></com.android.systemui.statusbar.tablet.TabletStatusBarView>


This file sets the Add button (volume plus button) and sub button (volume minus button) attributes. Android: visibility = "invisible" is set to invisible.

However, this will not be able to achieve the disappearance and display effect when switching between landscape and landscape screens.

Then I checked the mx0831-0525 \ frameworks \ base \ packages \ systemui \ SRC \ com \ Android \ systemui \ statusbar \ tablet \ tabletstatusbar. Java File

The onconfigurationchanged (configuration newconfig) method of the file is modified as follows:


 @Override    protected void onConfigurationChanged(Configuration newConfig) {        loadDimens();//edited by ouyangpeng startif(newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE){mVolumeUpButton.setVisibility(View.VISIBLE);mVolumeDownButton.setVisibility(View.VISIBLE);}else if(newConfig.orientation == Configuration.ORIENTATION_PORTRAIT){mVolumeUpButton.setVisibility(View.GONE);mVolumeDownButton.setVisibility(View.GONE);}        //edited by ouyangpeng end        mNotificationPanelParams.height = getNotificationPanelHeight();        WindowManagerImpl.getDefault().updateViewLayout(mNotificationPanel,                mNotificationPanelParams);        mRecentsPanel.updateValuesFromResources();        mShowSearchHoldoff = mContext.getResources().getInteger(                R.integer.config_show_search_delay);        updateSearchPanel();    }


In this way, you can dynamically set the disappearance and display of the volume key based on the horizontal and vertical screen of Android.


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Author: Ouyang Peng: Welcome to repost. sharing with others is the source of progress!

Reprinted Please retain the original address: http://blog.csdn.net/ouyang_peng

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