android webView截图的4种方法

android 在webView里面截图大概有四种方式，具体内容如下

1.获取到DecorView然后将DecorView转换成bitmap然后写入到文件里面.

View view = getWindow().getDecorView();
 Bitmap bitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);
  Canvas canvas = new Canvas(bitmap);
   view.draw(canvas);
   Log.d(TAG,"bitmap--"+bitmap);
   try {
     String fileName = Environment.getExternalStorageDirectory().getPath()+"/webview_jietu.jpg";
     FileOutputStream fos = new FileOutputStream(fileName);
     //压缩bitmap到输出流中
     bitmap.compress(Bitmap.CompressFormat.JPEG, 70, fos);
     fos.close();
     Toast.makeText(WebviewFromGetDecorView.this, "截屏成功", Toast.LENGTH_LONG).show();

} catch (Exception e) {
     Log.e(TAG, e.getMessage());
   }finally {
     if(bitmap!=null) {
    bitmap.recycle();
}

}

2.使用webViewpicture来实现该功能.(该方法被废弃了因此不建议使用)

Picture picture = webView.capturePicture();
 int width = picture.getWidth();
 int height = picture.getHeight();
  if (width > 0 && height > 0) {
  Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
  Canvas canvas = new Canvas(bitmap);
  picture.draw(canvas);
   try {
    String fileName = Environment.getExternalStorageDirectory().getPath()+"/webview_jietu.jpg";
    FileOutputStream fos = new FileOutputStream(fileName);
    //压缩bitmap到输出流中
    bitmap.compress(Bitmap.CompressFormat.JPEG, 70, fos);
    fos.close();
    Toast.makeText(WebviewFromCapture.this, "截屏成功", Toast.LENGTH_LONG).show();
    bitmap.recycle();
    } catch (Exception e) {
  Log.e(TAG, e.getMessage());
 }
}

3.使用webViewDraw来实现.(该方法被废弃了因此不建议使用)

float scale = webView.getScale();
 int webViewHeight = (int) (webView.getContentHeight()*scale+0.5);
  Bitmap bitmap = Bitmap.createBitmap(webView.getWidth(),webViewHeight, Bitmap.Config.ARGB_8888);
  Canvas canvas = new Canvas(bitmap);
  webView.draw(canvas);
   try {
    String fileName = Environment.getExternalStorageDirectory().getPath()+"/webview_jietu.jpg";
    FileOutputStream fos = new FileOutputStream(fileName);
    //压缩bitmap到输出流中
     bitmap.compress(Bitmap.CompressFormat.JPEG, 70, fos);
     fos.close();
     Toast.makeText(WebviewFromDraw.this, "截屏成功", Toast.LENGTH_LONG).show();
     bitmap.recycle();
     } catch (Exception e) {
 Log.e(TAG, e.getMessage());
}

4.使用webViewDrawCache来实现(建议使用).

Bitmap bitmap = webView.getDrawingCache();
 try {
   String fileName = Environment.getExternalStorageDirectory().getPath() + "/webview_jietu.jpg";
   FileOutputStream fos = new FileOutputStream(fileName);
   //压缩bitmap到输出流中
   bitmap.compress(Bitmap.CompressFormat.JPEG, 70, fos);
   bitmap.recycle();
   fos.close();
  Toast.makeText(WebviewFromDrawCache.this, "截屏成功", Toast.LENGTH_LONG).show();
} catch (Exception e) {
     Log.e(TAG, e.getMessage());
   } finally {
     bitmap.recycle();
}

注意:

在android5.0及以上版本使用webView进行截长图时,默认是截取可是区域内的内容.因此需要在支撑窗体内容之前加上如下方法.

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
 WebView.enableSlowWholeDocumentDraw();
  }
setContentView(R.layout.activity_webview);

来源：https://blog.csdn.net/unreliable_narrator/article/details/75650363