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 3.0
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