Android 动态加载二维码视图生成快照的示例

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  android:id="@+id/qrcodeContentLl" 
  android:background="#F0E68C" 
  android:orientation="vertical"> 
 
  <TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_gravity="center" 
    android:layout_marginTop="100dp" 
    android:text="二维码快照" 
    android:textSize="18sp" 
    android:textStyle="italic" /> 
 
  <ImageView 
    android:id="@+id/qrcodeIv" 
    android:layout_width="100dp" 
    android:layout_height="100dp" 
    android:layout_gravity="center" 
    android:layout_marginTop="@dimen/activity_vertical_margin" 
    android:scaleType="fitCenter" /> 
 
  <!--<TextView--> 
    <!--android:layout_width="wrap_content"--> 
    <!--android:layout_height="wrap_content"--> 
    <!--android:layout_marginTop="800dp"--> 
    <!--android:text="ahahds"--> 
    <!--android:layout_gravity="center"/>--> 
</LinearLayout> 

private void inflateAndShowCaptureView() { 
   if (hideView == null) { 
     hideView = LayoutInflater.from(this).inflate(R.layout.layout_quick_capture, null); 
     qrcodeIv = (ImageView) hideView.findViewById(R.id.qrcodeIv); 
     hideView.setDrawingCacheEnabled(true);//设置控件允许绘制缓存 
     hideView.measure(View.MeasureSpec.makeMeasureSpec(mainLayoutLl.getWidth(), View.MeasureSpec.EXACTLY), 
         View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED)); 
     hideView.layout(0, 0, hideView.getMeasuredWidth(), hideView.getMeasuredHeight()); 
   } else { 
     hideView.destroyDrawingCache();//要得到新的视图，就得销毁之前的缓存 
   } 
 
   showCaptureView(); 
 } 
 
 private void showCaptureView() { 
   String content = contentEt.getText().toString().trim(); 
   if (content == null || content.length() == 0) { 
     return; 
   } 
   if (qrcodeIv.getWidth() == 0) { 
     return; 
   } 
   Bitmap qrcodeBitmap = ZXingUtils.createQRImage(content, qrcodeIv.getWidth(), qrcodeIv.getHeight()); 
   qrcodeIv.setImageBitmap(qrcodeBitmap);//先将生成的二维码显示在加载的视图上 
 
   Bitmap bitmap = hideView.getDrawingCache(); // 获取视图的绘制缓存（快照） 
   if (bitmap != null) { 
     showIv.setImageBitmap(bitmap); 
   } 
 
 } 

hideView.measure(View.MeasureSpec.makeMeasureSpec(mainLayoutLl.getWidth(), View.MeasureSpec.EXACTLY), 
    View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED)); 
hideView.layout(0, 0, hideView.getMeasuredWidth(), hideView.getMeasuredHeight());