Android WebView关于图片/文件上传

最近做了一个项目，其中内嵌了html，当需求中涉及到要通过webview调用本地的相册，进行图片上传的时候，在网上查询了很多的资料，但是大部分在国内搜出来的东西或多或少都有点问题，所以就谷歌了一下。终于把问题解决了，写一个文章记录下，以便于以后做到类似的项目能够快速使用。

一般我们在网上找到的思路，都是先给webview设置WebChromeClient，然后复用里面的方法。

为了兼容不同版本的系统，我们需要重写4个方法:

1. openFileChooser(ValueCallback<Uri> uploadMsg) 针对android3.0以下的

2. openFileChooser(ValueCallback<Uri> ,String acceptType) 针对3.0以上 4.0以下

3. openFileChooser(ValueCallback<Uri> uploadmsg, String acceptType,String capture) 4 4.0以上

4. onShowFileChooser(Webview webview , ValueCallback<Uri[]> filePathCallback,FileChooseParams fileChooseParams) 针对5.0以上系统

其中，前三个方法，我们都只需调用同一个方法即可。

public void openFileChooser(ValueCallback<Uri> uploadMsg)
{
openFileChooser(uploadMsg,null);

}

public void openFileChooser(ValueCallback uploadMsg, String acceptType)
{
openFileChooser(uploadMsg,acceptType,null);

}

//For Android 4.1
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture)
{
mUploadMessage = uploadMsg;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("image/*");
startActivityForResult(Intent.createChooser(i, "Image Chooser"), WebActivity.FILECHOOSER_RESULTCODE);

}

private File createImageFile() throws IOException
{
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
File imageFile = File.createTempFile(imageFileName, ".jpg", storageDir);
return imageFile;
}

public void onActivityResult(int requestCode, int resultCode, Intent data)
{
if (requestCode == FILECHOOSER_RESULTCODE)
{
if (null == mUploadMessage) return;
Uri result = data == null || resultCode != RESULT_OK ? null : data.getData();
if (result != null)
{
String imagePath = ImageFilePath.getPath(this, result);
if (!StringUtils.isEmpty(imagePath))
{
result = Uri.parse("file:///" + imagePath);
}
}
mUploadMessage.onReceiveValue(result);
mUploadMessage = null;
} else if (requestCode == INPUT_FILE_REQUEST_CODE && mFilePathCallback != null)
{
// 5.0的回调
Uri[] results = null;

// Check that the response is a good one
if (resultCode == Activity.RESULT_OK)
{
if (data == null)
{

if (mCameraPhotoPath != null)
{
Log.d("camera_photo_path", mCameraPhotoPath);
results = new Uri[]{Uri.parse(mCameraPhotoPath)};
}
} else
{
String dataString = data.getDataString();
Log.d("camera_dataString", dataString);
if (dataString != null)
{
results = new Uri[]{Uri.parse(dataString)};
}
}
}

mFilePathCallback.onReceiveValue(results);
mFilePathCallback = null;
} else
{
super.onActivityResult(requestCode, resultCode, data);
return;
}
}
}
--------------------------图片路径获取的工具类---------------------------
import android.annotation.TargetApi;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;

/**
* Created by hiviiup on 16/3/7.
*/
public class ImageFilePath
{

@TargetApi(Build.VERSION_CODES.KITKAT)
public static String getPath(final Context context, final Uri uri) {

// check here to KITKAT or new version
final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;

// DocumentProvider
if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {

// ExternalStorageProvider
if (isExternalStorageDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];

if ("primary".equalsIgnoreCase(type)) {
return Environment.getExternalStorageDirectory() + "/"
+ split[1];
}
}
// DownloadsProvider
else if (isDownloadsDocument(uri)) {

final String id = DocumentsContract.getDocumentId(uri);
final Uri contentUri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"),
Long.valueOf(id));

return getDataColumn(context, contentUri, null, null);
}
// MediaProvider
else if (isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];

Uri contentUri = null;
if ("image".equals(type)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}

final String selection = "_id=?";
final String[] selectionArgs = new String[] { split[1] };

return getDataColumn(context, contentUri, selection,
selectionArgs);
}
}
// MediaStore (and general)
else if ("content".equalsIgnoreCase(uri.getScheme())) {

// Return the remote address
if (isGooglePhotosUri(uri))
return uri.getLastPathSegment();

return getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}

return null;
}

/**
* Get the value of the data column for this Uri. This is useful for
* MediaStore Uris, and other file-based ContentProviders.
*
* @param context
* The context.
* @param uri
* The Uri to query.
* @param selection
* (Optional) Filter used in the query.
* @param selectionArgs
* (Optional) Selection arguments used in the query.
* @return The value of the _data column, which is typically a file path.
*/
public static String getDataColumn(Context context, Uri uri,
String selection, String[] selectionArgs) {

Cursor cursor = null;
final String column = "_data";
final String[] projection = { column };

try {
cursor = context.getContentResolver().query(uri, projection,
selection, selectionArgs, null);
if (cursor != null && cursor.moveToFirst()) {
final int index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}

/**
* @param uri
* The Uri to check.
* @return Whether the Uri authority is ExternalStorageProvider.
*/
public static boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri
.getAuthority());
}

/**
* @param uri
* The Uri to check.
* @return Whether the Uri authority is DownloadsProvider.
*/
public static boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri
.getAuthority());
}

/**
* @param uri
* The Uri to check.
* @return Whether the Uri authority is MediaProvider.
*/
public static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri
.getAuthority());
}

/**
* @param uri
* The Uri to check.
* @return Whether the Uri authority is Google Photos.
*/
public static boolean isGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.content".equals(uri
.getAuthority());
}
}