在方法内部屏幕捕获的onCreate不是Android平台 [英] Screen capture inside the method onCreate not working in android

问题描述

我在Android应用程序的工作，我想捕捉当前活动的屏幕在Overrided方法的onCreate（）。当我写了code捕捉画面Overrided方法的onCreate（）内的位图返回null。但是，当我在同一个活动调用相同的code在点击一个按钮位图返回正确的值。请纠正我的code。通过位图我ocCreate返回（）方法本身。

我的code是：

 查看V1 = findViewById（R.id.print previewBaseScrollView）;
v1.setDrawingCacheEnabled（真）;
位图BMV = v1.getDrawingCache（）;
 

解决方案

 查看printlayout = findViewById（R.id.print previewBaseRelativeLayout）;
        printlayout.setDrawingCacheEnabled（真）;        printlayout.measure（printlayout.getMeasuredWidth（），
                printlayout.getMeasuredHeight（））;         printlayout.layout（0，0，700 1755）;        Log.e（宽，+ printlayout.getMeasuredWidth（））;
        Log.e（HIGHT，+ printlayout.getMeasuredHeight（））;        printlayout.buildDrawingCache（真）;        位图= Bitmap.createBitmap（printlayout.getDrawingCache（））;
        printlayout.setDrawingCacheEnabled（假）; //明确绘图缓存
 

I am working in an android application and I want to capture the screen of current activity in the Overrided method onCreate(). The bitmap returns null when I wrote the code for capturing screen inside the Overrided method onCreate(). But when I call the same code in a button click in the same activity the bitmap returns the correct value. Please correct my code to return by bitmap in my ocCreate() method itself.

My code is :

View v1 = findViewById(R.id.printpreviewBaseScrollView);
v1.setDrawingCacheEnabled(true);
Bitmap bmv = v1.getDrawingCache();

解决方案

View printlayout = findViewById(R.id.printpreviewBaseRelativeLayout);
        printlayout.setDrawingCacheEnabled(true);

        printlayout.measure(printlayout.getMeasuredWidth(),
                printlayout.getMeasuredHeight());

         printlayout.layout(0, 0, 700, 1755);



        Log.e("width", "" + printlayout.getMeasuredWidth());
        Log.e("hight", "" + printlayout.getMeasuredHeight());

        printlayout.buildDrawingCache(true);

        bitmap = Bitmap.createBitmap(printlayout.getDrawingCache());
        printlayout.setDrawingCacheEnabled(false); // clear drawing cache

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