Android Add volume plus minus button in navigation bar Android source code case

Some Android devices do not have an entity's volume adjustment button, or from the point of view of protecting the body keys, you need to add a volume plus minus adjustment button to the virtual keys in the navigation bar.

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The effect is as follows:

The implementation process is as follows:

1. First add the volume plus minus resource file in Systemui, the path is as follows:

frameworks/base/packages/systemui/res/

Put the picture in the corresponding drawable folder, including Volume +, and volume--see.

2. Modify the navigation bar layout file, path:

frameworks/base/packages/systemui/res/

Locate the Navigation_bar.xml file in the corresponding layout folder to modify it:

Add "Volume minus" before the return key to return the layout of the key:

<com.android.systemui.statusbar.policy.keybuttonview android:id= "@+id/back"                android:layout_width= "128DP" Android:paddingstart= "25DP" android:paddingend= "25DP"                android:layout_height= "match_parent"                android:src= "@drawable/ic_sysbar_back"                systemui:keycode= "4"                android:layout_weight= "0"                systemui:glowbackground= "@drawable/ic_sysbar_highlight"                android:contentdescription= "@string/accessibility_back"                />

Detailed Description: http://android.662p.com/thread-6038-1-1.html

Android Add volume plus minus button in navigation bar Android source code case