视图完全渲染后如何进行回调？ [英] How to make a callback after the view is completely rendered?

问题描述

在视图完全呈现后如何进行回调？

How to make a callback after the view is completely rendered ?

我正在尝试调用一个获取父视图屏幕截图的方法。
如果我在 onCreate（）方法中编写该代码，则应用程序将由于空指针而崩溃（因为未呈现任何视图）。现在，我已经实现的
临时解决方案是在调用该方法之前延迟1秒。
但是，我正在寻找一个更强大的解决方案。

I am trying to call a method which takes a screen-shot of parent view. If I write that code in onCreate() method, the app crashes due to null pointer (as no view is rendered). for now the temporary solution I have implemented is to make a delay of 1 second before calling that method. But, I am looking for a much more robust solution to this problem.

任何建议和帮助都值得赞赏。
谢谢：）

any suggestions and help appreciated. thanks :)

推荐答案

我现在有一个更好的选择:)
这确实可以打电话呈现布局后返回

I have got a better option now :) this really gives a call-back after the layout is rendered

private class LoadActivity extends AsyncTask<String, Void, String> {

    @Override
    protected void onPreExecute() {
        super.onPreExecute();

        mainMethod();
    }

    @Override
    protected void onPostExecute(String result) {
        super.onPostExecute(result);

        takeScreenShot(1);
    }

    @Override
    protected String doInBackground(String... params) {
        return null;
    };
}

我创建了上面的类，然后在onCreate（）中调用此方法来执行

I created the above class and then called this method for execution in onCreate()

LoadActivity loadactivity= new LoadActivity();
loadactivity.execute();

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