Android-Optimizing UI Performance (3)-Optimize your activity's background image

android-Optimizing UI Performance (3)-Optimize your activity's background image
At some point, we may want to improve the performance of the activity as much as possible, then we can optimize the activity's background graph
First, in the activity, not only the view that you use for the Setcontentview (), but also some other view
Such as:


By default, Decorview contains a default background map, which is the starting point to optimize activity
1, using
GetWindow (). setbackgrounddrawable (drawable)
GetWindow (). Setbackgrounddrawableresource (Resid)
The code is as follows:

@Override    protectedvoidonCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);        getWindow().setBackgroundDrawableResource(R.drawable.ic_launcher);        setContentView(R.layout.activity_main);    }

2, custom theme
Create a Res/values/theme.xml file
The format is defined as follows:

<resource>    <style name="Mytheme" parent="android:Theme">     <item name="android:windowBackground">@null</item>    </style></resources>

You can set the mytheme to NULL as needed or the background image you need

Then add it in the OR tag

android:theme="@style/MyTheme"

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Android-Optimizing UI Performance (3)-Optimize your activity's background image