android webView截长图

来源：互联网发布：胡金铨知乎编辑：程序博客网时间：2024/06/06 15:36

android 在webView里面截图大概有四种方式.

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);

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