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我實現Web視圖登錄後加載用戶的主頁。 Web視圖既包括文件的上傳和的下載鏈接。Android的Web視圖文件上傳不工作的版本低於5.0
我已經搜索了關於如何實現這個信息的stackoverflow，並且遇到了一些有用的鏈接，這些鏈接幫助我滿足了某些級別的要求。我現在面臨的問題是，我的文件上傳不適用於低於5.0的Android版本;對於5.0以上的版本，它似乎工作和文件選擇器（瀏覽器）似乎彈出一旦我點擊並上傳按鈕內的網頁視圖。但是對於小於5.0的版本，似乎有沒有任何操作。
我在Android上工作的經驗並不多，而且這是我第一次在項目中使用web視圖。另外，這是我的第一個關於堆棧溢出的問題，請原諒我的問題中的任何錯誤。 預先感謝誰提供一些幫助來達到我的解決方案。有些解釋總是值得讚賞的。
粘貼我的示例代碼如下：
/**
* 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();
}
這是我使用的文件下載（我只是把它粘貼代碼，萬一有人可能覺得很有用）。任何 修改在下面的代碼表示讚賞。
/**
* 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額外的信息，只是評論，我會在這裏發表 它。