在Fragment中获取屏幕截图方法 [英] Take screenshot method inside Fragment

问题描述

我一直试图使这段代码在一个片段中运行.这段代码可以在Activity中正常运行，但是我无法使其在片段中正常工作.

I've been trying to get this code working inside a fragment. This code runs fine inside an Activity, but I can't make it to work inside the fragment.

当我单击一个按钮时，它将调用takeScreenshot方法.

When I click a button, it calls the takeScreenshot method.

这是屏幕截图的代码:

public Bitmap takeScreenshot() {
    View rootView = findViewById(android.R.id.content).getRootView();
    rootView.setDrawingCacheEnabled(true);
    return rootView.getDrawingCache();
}

由于位于片段中，因此无法识别"findViewById".

The "findViewById" it's not recognized due to being in a fragment.

我尝试过:

View rootView = getView().findViewById(android.R.id.content).getRootView();

但它也不起作用.我得到

but it's not working either. I get

07-25 09:37:32.746: E/AndroidRuntime(31221): FATAL EXCEPTION: main
07-25 09:37:32.746: E/AndroidRuntime(31221): java.lang.NullPointerException
07-25 09:37:32.746: E/AndroidRuntime(31221):    at com.dream3ncore.thefinalwordcounts.level01.Song01.takeScreenshot(Song01.java:763)
07-25 09:37:32.746: E/AndroidRuntime(31221):    at com.dream3ncore.thefinalwordcounts.level01.Song01.onClick(Song01.java:152)
07-25 09:37:32.746: E/AndroidRuntime(31221):    at android.view.View.performClick(View.java:4211)
07-25 09:37:32.746: E/AndroidRuntime(31221):    at android.view.View$PerformClick.run(View.java:17362)
07-25 09:37:32.746: E/AndroidRuntime(31221):    at android.os.Handler.handleCallback(Handler.java:725)
07-25 09:37:32.746: E/AndroidRuntime(31221):    at android.os.Handler.dispatchMessage(Handler.java:92)
07-25 09:37:32.746: E/AndroidRuntime(31221):    at android.os.Looper.loop(Looper.java:137)
07-25 09:37:32.746: E/AndroidRuntime(31221):    at android.app.ActivityThread.main(ActivityThread.java:5227)
07-25 09:37:32.746: E/AndroidRuntime(31221):    at java.lang.reflect.Method.invokeNative(Native Method)
07-25 09:37:32.746: E/AndroidRuntime(31221):    at java.lang.reflect.Method.invoke(Method.java:511)
07-25 09:37:32.746: E/AndroidRuntime(31221):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
07-25 09:37:32.746: E/AndroidRuntime(31221):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
07-25 09:37:32.746: E/AndroidRuntime(31221):    at dalvik.system.NativeStart.main(Native Method)

任何帮助将不胜感激.

推荐答案

您的 Fragment 用户界面是 Activity 用户界面的子集. Fragment 中的 getView()将仅返回其自己的视图层次结构.您只需将对 getView()的调用更改为 getActivity()，就可以了.另外，我相信您可以只调用 getView().getRootView()并避免首先查找 android.R.id.content .

Your Fragment's UI is a subset of your Activity's UI. getView() in a Fragment will return only its own view hierarchy. You could just change your call to getView() to getActivity(), and that would work. Alternately, I believe you could just call getView().getRootView() and avoid the lookup of android.R.id.content in the first place.

这篇关于在Fragment中获取屏幕截图方法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IT屋！