Android performance optimization tips

使用windowBackground实现应用秒开

<style name="SplashTheme" parent="@android:style/Theme.Black.NoTitleBar.Fullscreen">
    <item name="android:windowBackground">@drawable/bg_splash_activity</item>
    <item name="@android:windowAnimationStyle">@style/myact</item>
</style>

使用windowBackground减少过度绘制

<style name="AppMainTheme" parent="@android:style/Theme.Holo.Light">
    <item name="android:windowBackground">@color/white</item>
    <item name="android:windowNoTitle">true</item>
    <item name="@android:windowAnimationStyle">@style/myact</item>
</style>

手动清除GPU绘图缓存，降低应用PSS内存值

/**
 * 清除GPU绘图缓存
 */
private void cleanGraphicsCache() {
    Object instance = ReflectUtils.getStaticMethod("android.view.WindowManagerGlobal",
            "getInstance", null, null);

    try {
        Class threadClazz = Class.forName("android.view.WindowManagerGlobal");
        Method m1 = threadClazz.getDeclaredMethod("trimMemory", int.class);
        m1.invoke(instance, TRIM_MEMORY_COMPLETE);
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    } catch (NoSuchMethodException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    } catch (InvocationTargetException e) {
        e.printStackTrace();
    }
}

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