android 应用取消默认的window preview

当启动一个activity或者应用的时候,系统会先加载一个window preview的UI来增加过渡效果,但是有时候这种效果体验并不好,比如用户自定义的白色界面,然后预览的黑色界面,这样不和谐,如果需要去掉这种预览效果,需要做如下修改:

1.增加一个style 

    <style name="Theme.NoDisplay" parent="@android:Theme">
        <item name="android:windowBackground">@null</item>
        <item name="android:windowContentOverlay">@null</item>
        <item name="android:windowIsTranslucent">false</item>
        <item name="android:windowAnimationStyle">@null</item>
        <item name="android:windowDisablePreview">true</item>
        <item name="android:windowNoDisplay">false</item>
    </style>

 2.在activity里面调用

 android:theme="@style/Theme.NoDisplay"

 

相关的系统说明如下 ,android.view.

android.view.WindowManagerPolicy里面定义,

com.android.internal.policy.impl.PhoneWindowManager里面实现:

 

/**
     * Called when the system would like to show a UI to indicate that an
     * application is starting.  You can use this to add a
     * APPLICATION_STARTING_TYPE window with the given appToken to the window
     * manager (using the normal window manager APIs) that will be shown until
     * the application displays its own window.  This is called without the
     * window manager locked so that you can call back into it.
     * 
     * @param appToken Token of the application being started.
     * @param packageName The name of the application package being started. 
     * @param theme Resource defining the application's overall visual theme.
     * @param nonLocalizedLabel The default title label of the application if
     *        no data is found in the resource.
     * @param labelRes The resource ID the application would like to use as its name.
     * @param icon The resource ID the application would like to use as its icon.
     * @param windowFlags Window layout flags.
     * 
     * @return Optionally you can return the View that was used to create the
     *         window, for easy removal in removeStartingWindow.
     * 
     * @see #removeStartingWindow
     */
    public View addStartingWindow(IBinder appToken, String packageName,
            int theme, CompatibilityInfo compatInfo, CharSequence nonLocalizedLabel,
            int labelRes, int icon, int windowFlags);