一卷旌收千骑虏,万全身出百重围。这篇文章主要讲述在Android浏览器中通过WebView调用相机拍照/选择文件 上传到服务器相关的知识,希望能为你提供帮助。
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">
文章图片
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
[java] view plaincopy
- 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 3.0
- public 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
【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】再分享一下我老师大神的人工智能教程吧。零基础!通俗易懂!风趣幽默!还带黄段子!希望你也加入到我们人工智能的队伍中来!https://blog.csdn.net/jiangjunshow
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