在Android浏览器中通过WebView调用相机拍照/选择文件 上传到服务器

  最近做的一个项目中，有这样一个要求，在浏览器中调用系统的拍照功能或者选择文件，然后将文件上传到服务器，类似修改头像。        简单而言，就是在一个html页面中有这样一段代码 <input class="filePrew" type="file" capture="camera" accept="image/*" name="image">

刚开始的时候，没有感觉很难的，因为在UC浏览器、系统自带的浏览器中都可以进行拍照/文件管理器选择，可是在自己所写的Activity中却不行。后来实在是没有思路了，就在网上找了一下，发现要        实现这种功能，都是在webview的WebChromeClient中覆盖掉openFileChooser方法，注意openFileChooser方法在WebChromeClient中有@hide标记。这里只管重写即可,下面将主要代码贴出来，做个记录        

private ValueCallback<Uri> mUploadFile;/**拍照/选择文件请求码*/private static final int REQUEST_UPLOAD_FILE_CODE = 12343;private void setWebChromeClient(){if (null != mMainWebView){mMainWebView.setWebChromeClient(new WebChromeClient(){// Andorid 4.1+public void openFileChooser(ValueCallback<Uri> uploadFile, String acceptType, String capture){openFileChooser(uploadFile);}// Andorid 3.0 +public void openFileChooser(ValueCallback<Uri> uploadFile, String acceptType){openFileChooser(uploadFile);}// Android 3.0public void openFileChooser(ValueCallback<Uri> uploadFile){// Toast.makeText(WebviewActivity.this, "上传文件/图片",Toast.LENGTH_SHORT).show();mUploadFile = uploadFile;startActivityForResult(Intent.createChooser(createCameraIntent(), "Image Browser"), REQUEST_UPLOAD_FILE_CODE);}});}}private Intent createCameraIntent(){Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);//拍照//=======================================================Intent imageIntent = new Intent(Intent.ACTION_GET_CONTENT);//选择图片文件imageIntent.setType("image/*");//=======================================================return cameraIntent;}//最后在OnActivityResult中接受返回的结果protected void onActivityResult(int requestCode, int resultCode, Intent data){if (requestCode == REQUEST_UPLOAD_FILE_CODE && resultCode == RESULT_OK){if (null == mUploadFile){return;}Uri result = (null == data) ? null : data.getData();if (null != result){ContentResolver resolver = this.getContentResolver();String[] columns = { MediaStore.Images.Media.DATA };Cursor cursor = resolver.query(result, columns, null, null, null);cursor.moveToFirst();int columnIndex = cursor.getColumnIndex(columns[0]);String imgPath = cursor.getString(columnIndex);System.out.println("imgPath = " + imgPath);if (null == imgPath){return;}File file = new File(imgPath);   //将图片处理成大小符合要求的文件result = Uri.fromFile(handleFile(file));mUploadFile.onReceiveValue(result);mUploadFile = null;}}super.onActivityResult(requestCode, resultCode, data);}/**处理拍照/选择的文件*/private File handleFile(File file){DisplayMetrics dMetrics = getResources().getDisplayMetrics();BitmapFactory.Options options = new Options();options.inJustDecodeBounds = true; BitmapFactory.decodeFile(file.getAbsolutePath(), options);int imageWidth = options.outWidth;int imageHeight = options.outHeight;System.out.println("  imageWidth = " + imageWidth + " imageHeight = " + imageHeight);int widthSample = (int) (imageWidth / (dMetrics.density * 90));int heightSample = (int) (imageHeight / (dMetrics.density * 90));System.out.println("widthSample = " + widthSample + " heightSample = " + heightSample);options.inSampleSize = widthSample < heightSample ? heightSample : widthSample;options.inJustDecodeBounds = false;Bitmap newBitmap = BitmapFactory.decodeFile(file.getAbsolutePath(), options);System.out.println("newBitmap.size = " + newBitmap.getRowBytes() * newBitmap.getHeight());File handleFile = new File(file.getParentFile(), "upload.png");try{if (newBitmap.compress(CompressFormat.PNG, 50, new FileOutputStream(handleFile))){System.out.println("保存图片成功");}}catch (FileNotFoundException e){e.printStackTrace();}return handleFile;}

  这样就可以在WebView中上传文件了。记得要添加相应的权限！  
       参考：http://developer.android.com/about/versions/android-3.0.html

  http://blog.sina.com.cn/s/blog_5749ead90101clrn.html