我正在实施Web视图以在登录后加载用户的主页。 网络视图包含文件上传和下载链接。
我已经搜索了stackoverflow以获取有关如何实现这一点的信息，并且遇到了一些有用的链接，这些链接帮助我满足了某些级别的要求。我现在面临的问题是我的文件上传不适用于低于5.0的Android版本;对于5.0以上的版本，它似乎正常工作，只要我在网页视图中点击并上传按钮，就会弹出文件选择器（浏览器）。但是对于小于5.0的版本似乎根本没有任何动作。
我在Android工作的经验很少，这是我第一次在项目中使用Web视图。另外，这是我关于堆栈溢出的第一个问题，请原谅我的问题中的任何错误。 在此之前，请提供帮助，以便为我的解决方案提供帮助。总是会有一些解释。
粘贴我的示例代码：
/**
* Settings for WebView & Loading webView from URL
*/
WebSettings webSettings = webView.getSettings();
webSettings.setLoadWithOverviewMode(true);
webSettings.setBuiltInZoomControls(true);
webSettings.setUseWideViewPort(true);
webSettings.setJavaScriptEnabled(true);
webSettings.setAllowFileAccess(true);
webSettings.setAllowFileAccess(true);
webSettings.setAllowContentAccess(true);
dialog = ProgressDialog.show(this, "Loading", "Please wait...", true);
dialog.setCancelable(true);
/**
* Checking device release version
*/
Log.d("ReleaseVersion", "=" + androidOS);
if (androidOS == 16) {
fourBoolean = true;
}
if (!fourBoolean) {
if (androidOS > 10 && androidOS < 21) {
firstBoolean = true;
} else if (androidOS >= 21) {
fiveBoolean = true;
}
}
/**
* fourBoolean gives TRUE if Target SDK version is 4.1
* firstBoolean gives TRUE if Target SDK version is 3.0+ (till 5.0, except 4.1)
* fiveBoolean gives TRUE if Target SDK version is 5.0+
*/
Log.d("ReleaseVersionFlags", "=" + "fourBoolean" + "=" + fourBoolean);
Log.d("ReleaseVersionFlags", "=" + "firstBoolean" + "=" + firstBoolean);
Log.d("ReleaseVersionFlags", "=" + "fiveBoolean" + "=" + fiveBoolean);
/**
* Method for uploading files to WebView (based on Target SDK version)
*/
if (fourBoolean) {
Log.d("ReleaseVersionStatus", "=" + "4.1");
webView.setWebChromeClient(new WebChromeClient() {
//For Android 4.1 only
protected void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
Log.d("ReleaseVersionInside", "=" + "inside 4.1 ONE");
mUploadMessage = uploadMsg;
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("image/*");
startActivityForResult(Intent.createChooser(intent, "File Browser"), FILECHOOSER_RESULTCODE);
}
protected void openFileChooser(ValueCallback<Uri> uploadMsg) {
Log.d("ReleaseVersionInside", "=" + "inside 4.1 TWO");
mUploadMessage = uploadMsg;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("image/*");
startActivityForResult(Intent.createChooser(i, "File Chooser"), FILECHOOSER_RESULTCODE);
}
});
}
if (firstBoolean) {
Log.d("ReleaseVersionStatus", "=" + "3.0+");
webView.setWebChromeClient(new WebChromeClient() {
// For 3.0+ Devices (Start)
// onActivityResult attached before constructor
protected void openFileChooser(ValueCallback uploadMsg, String acceptType) {
Log.d("ReleaseVersionInside", "=" + "inside 3.0");
mUploadMessage = uploadMsg;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("image/*");
startActivityForResult(Intent.createChooser(i, "File Browser"), FILECHOOSER_RESULTCODE);
}
});
}
if (fiveBoolean) {
Log.d("ReleaseVersionStatus", "=" + "5.0+");
webView.setWebChromeClient(new WebChromeClient() {
// For Lollipop 5.0+ Devices
public boolean onShowFileChooser(WebView mWebView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) {
Log.d("ReleaseVersionInside", "=" + "inside 5.0");
if (uploadMessage != null) {
uploadMessage.onReceiveValue(null);
uploadMessage = null;
}
uploadMessage = filePathCallback;
Intent intent = null;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
intent = fileChooserParams.createIntent();
}
try {
startActivityForResult(intent, REQUEST_SELECT_FILE);
} catch (ActivityNotFoundException e) {
uploadMessage = null;
Toast.makeText(getApplicationContext(), "Cannot Open File Chooser", Toast.LENGTH_LONG).show();
return false;
}
return true;
}
});
}
/**
* Override method to get result from FileChooser activity (File Upload)
*
* @param requestCode
* @param resultCode
* @param intent
*/
@Override
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
if (requestCode == REQUEST_SELECT_FILE) {
if (uploadMessage == null)
return;
uploadMessage.onReceiveValue(WebChromeClient.FileChooserParams.parseResult(resultCode, intent));
uploadMessage = null;
}
} else if (requestCode == FILECHOOSER_RESULTCODE) {
if (null == mUploadMessage)
return;
// Use MainActivity.RESULT_OK if you're implementing WebView inside Fragment
// Use RESULT_OK only if you're implementing WebView inside an Activity
Uri result = intent == null || resultCode != RESULT_OK ? null : intent.getData();
mUploadMessage.onReceiveValue(result);
mUploadMessage = null;
} else
Toast.makeText(getApplicationContext(), "Failed to Upload Image", Toast.LENGTH_LONG).show();
}
这是我用于文件下载的代码（我只是粘贴它，以防任何人发现它有用）。任何 我们非常感谢以下代码中的修改。
/**
* Method for downloading files from WebView
*/
webView.setDownloadListener(new DownloadListener() {
@Override
public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimeType, long contentLength) {
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
Log.d("DownloadURL", "=" + url);
if (url.endsWith(".pdf")) {
Log.d("DownloadURLMime", "=" + "application/" + FilenameUtils.getExtension(url));
request.setMimeType("application/" + FilenameUtils.getExtension(url));
} else {
Log.d("DownloadURLMime", "=" + mimeType);
request.setMimeType(mimeType);
}
String cookies = CookieManager.getInstance().getCookie(url);
request.addRequestHeader("cookie", cookies);
request.addRequestHeader("User-Agent", userAgent);
request.setDescription("APP_NAME");
request.setTitle(URLUtil.guessFileName(url, contentDisposition, mimeType));
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, URLUtil.guessFileName(url, contentDisposition, mimeType));
DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
dm.enqueue(request);
Toast.makeText(getApplicationContext(), "Downloading...", Toast.LENGTH_SHORT).show();
}
});
如果我需要提供任何其他信息，请发表评论并发布 它在这里。
答案 0 :(得分：0)
private void selectImage() {
final CharSequence[] options = { "Take Photo", "Choose Photo from Gallery","Choose PDF",
"Cancel" };
AlertDialog.Builder builder = new AlertDialog.Builder(activity);
builder.setTitle("Add Attachment !");
builder.setItems(options, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
if (options[item].equals("Take Photo"))
{
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File f = new File(Environment.getExternalStorageDirectory(), "temp.jpg");
Uri photoURI;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP){
photoURI = FileProvider.getUriForFile(activity, activity.getApplicationContext().getPackageName() + ".provider", f);
} else{
photoURI =Uri.fromFile(f);
}
// intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
intent.putExtra(MediaStore.EXTRA_OUTPUT,photoURI);
startActivityForResult(intent, 1);
}
else if (options[item].equals("Choose Photo from Gallery"))
{
Intent intent = new Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, 2);
}
else if (options[item].equals("Choose PDF"))
{
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("application/pdf");
startActivityForResult(intent.createChooser(intent, "Select Pdf"), 3);
}
else if (options[item].equals("Cancel")) {
dialog.dismiss();
}
}
});
builder.show();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK) {
if (requestCode == 1) {
File f = new File(Environment.getExternalStorageDirectory().toString());
for (File temp : f.listFiles()) {
Log.d("File Name",Environment.getExternalStorageDirectory()+"/Rc_Doc/"+temp.getName());
if (temp.getName().equals("temp.jpg")) {
f = temp;
fileSize=f.length()+"";
break;
}
}
try {
BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();
bitmap = BitmapFactory.decodeFile(f.getAbsolutePath(),
bitmapOptions);
type ="image/jpeg";
imageBase64=getStringImage(bitmap);
imageName="Rc_Doc_"+CommanVar.agentCode+String.valueOf(System.currentTimeMillis()) + ".jpg";
// display.setImageBitmap(bitmap);
sendImageRequest("saveImage.php",1);
} catch (Exception e) {
e.printStackTrace();
}
} else if (requestCode == 2) {
Uri selectedImage = data.getData();
String uriToString = selectedImage.getPath();
File file = new File(uriToString);
fileSize=file.length()+"";
String[] filePath = { MediaStore.Images.Media.DATA };
Cursor c = getContentResolver().query(selectedImage,filePath, null, null, null);
c.moveToFirst();
int columnIndex = c.getColumnIndex(filePath[0]);
String picturePath = c.getString(columnIndex);
c.close();
Bitmap thumbnail = (BitmapFactory.decodeFile(picturePath));
Log.d("Path", picturePath + "");
if(picturePath.endsWith("jpg") || picturePath.endsWith("png") || picturePath.endsWith("jpeg") ) {
String[] filename = picturePath.split("/");
// fileName.setText(filename[filename.length - 1]);
imageName = filename[filename.length - 1];
imageBase64 = getStringImage(thumbnail);
type = "image/jpeg";
sendImageRequest("saveImage.php", 2);
}
else{
ErrorDialogFragment alert = new ErrorDialogFragment();
alert.showDialog(VoucherEntryActivity.this, "You Can Upload only JPG,JPEG or PNG files....");
}
// display.setImageBitmap(thumbnail);
}
else if (requestCode == 3) {
Uri selectedPDF = data.getData();
String uriToString = selectedPDF.getPath();
Log.d("path2",uriToString);
File file = new File(uriToString);
int size = (int) file.length();
fileSize=size+"";
byte[] bytes = new byte[size];
String docPath = file.getAbsolutePath();
Log.d("path",docPath);
String [] filename =docPath.split("/");
Toast.makeText(this, docPath+"", Toast.LENGTH_SHORT).show();
if(docPath.endsWith("pdf"))
{
if(size < 1048576)
{
try {
BufferedInputStream buf = new BufferedInputStream(new FileInputStream(file));
buf.read(bytes, 0, bytes.length);
buf.close();
imageBase64 = Base64.encodeToString(bytes, Base64.DEFAULT);
imageName=filename[filename.length-1];
// fileName.setText(filename[filename.length-1]);
type ="application/pdf";
sendImageRequest("saveImage.php",3);
// Toast.makeText(activity, "Ok", Toast.LENGTH_SHORT).show();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else{
ErrorDialogFragment alert = new ErrorDialogFragment();
alert.showDialog(VoucherEntryActivity.this, "File Is too big...Maximum File Size 1 MB..");
// Toast.makeText(activity, "File Is too big...Maximum File Size 1 MB", Toast.LENGTH_SHORT).show();
}
}
else{
ErrorDialogFragment alert = new ErrorDialogFragment();
alert.showDialog(VoucherEntryActivity.this, "Please Select Only PDF File..");
// Toast.makeText(activity, "Please Select Only PDF File", Toast.LENGTH_SHORT).show();
}
}
}
}