Android android source code case when adding the volume plus/minus button in the navigation bar, Android android

Android android source code case when adding the volume plus/minus button in the navigation bar, Android android

Some Android devices do not have a volume adjustment button for the entity, or you need to add a volume addition or subtraction button to the virtual buttons in the navigation bar from the perspective of protecting the entity.

Here I recommend a better android source code segment Website: http://code.662p.com/list/173_1.html

Shows the effect:

 

 

The implementation process is as follows:

1. First, add the resource file of volume addition and subtraction in SystemUI. The path is as follows:

Frameworks/base/packages/SystemUI/res/

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

 

2. Modify the layout file in the navigation bar. Path:

Frameworks/base/packages/SystemUI/res/

Find the navigation_bar.xml file in the corresponding layout folder and modify it:

Add "volume reduction" before the return key. The layout of the Return key is as follows:

 

<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"                />

 

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