如何从ActivityInfo类获取android:configChanges值

问题描述

我想获取设备中存在的所有程序包的活动信息(例如configchanges，resizemode，如果支持画中画).

I would like to fetch activities info(Such as configchanges, resizemode, if Picture in Picture is supported) of all the packages present in the device.

我可以使用带有 GET_ACTIVITIES 标志的 PackageManager 来获取活动信息.这样，我可以使用 ActivityInfo.configChanges 获得 configChanges 值.

I am able to fetch the activities info using PackageManager with GET_ACTIVITIES flag. With that I can get configChanges value using ActivityInfo.configChanges.

但是，如果在 android:configChanges 中设置了多个配置值，则该值将返回一个随机整数.

However the value returns a random int if there are multiple config values set in android:configChanges.

例如:

如果设置了以下值

使用以下代码获取configchanges值

Getting configchanges value using below code

PackageInfo packageInfo = mPackageManager.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES);

ActivityInfo activityInfo[] = packageInfo.activities;

if(activityInfo!=null) {
    for(ActivityInfo activity : activityInfo) {
      int configChange = activity.configChanges;
    }
}

我得到 activity.configChanges 值为23047

I get activity.configChanges value as 23047

23047代表什么，我该如何对其进行解码，以便获得在 AndroidManifest.xml

What does 23047 denotes, how do I decode it so that I can get the config values that are set in AndroidManifest.xml

除此之外，我们还有任何方法可以获取 activity.resizeMode .我了解这是 @hide api.我可以在Android Studio中以调试模式看到该值.

In Addition to that is there any way we can get activity.resizeMode . I understand that it is @hide api. I can see the value in debugging mode though in Android Studio.

以上任何线索/帮助将非常有用.

Any leads/help to above will be really useful.

推荐答案

configChanges 是位掩码.

要检查是否设置了给定的位，您只需要使用适当的按位运算符.

To check if a given bit is set, you simply need to use an appropriate bitwise operator.

例如，要检查是否设置了 uiMode ，您可以执行以下操作:

For example, to check if uiMode is set you could do something like this:

int configChanges = activityInfo.configChanges;

if ((configChanges & ActivityInfo.CONFIG_UI_MODE) == ActivityInfo.CONFIG_UI_MODE) {
    // uiMode is set
} else {
    // uiMode is not set
}

定义方法可能会更容易:

Defining a method might make it easier:

public boolean isConfigSet(int configMask, int configToCheck) {
    return (configMask & configToCheck) == configToCheck;
}

您会这样称呼它:

int configChanges = activityInfo.configChanges;

boolean uiModeSet = isConfigSet(configChanges, ActivityInfo.CONFIG_UI_MODE);
boolean colorModeSet = isConfigSet(configChanges, ActivityInfo.CONFIG_COLOR_MODE);
// ...

可靠，不.尽管Google发布了博客帖子最近声明了以下内容:

Reliably, no. You might be able to access it through the reflection API, although Google released a blog post recently stating the following:

(强烈建议不要通过反射访问隐藏字段)

(accessing hidden fields via reflection is strongly discouraged anyway)

这篇关于如何从ActivityInfo类获取android:configChanges值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！