我正在尝试开发一个Android应用程序以使用webView加载我们的Web应用程序。该屏幕包含常规身份验证。登录成功后，我需要加载另一个URL地址，而不是该Web应用程序的实际主页。我在onPageFinished内部完成了此操作。但是仅在显示主屏幕后才加载第二个URL。请提出解决方案，以避免这种情况。 请找到以下代码示例：
public class LoginPage extends AppCompatActivity {
/********** For Camera ************/
/*-- you can customize these options for your convenience --*/
private static String webview_url = "initial url";
private static String initialURL = "Main url";
private static String file_type = "image/*"; // file types to be allowed for upload
private boolean multiple_files = true; // allowing multiple file upload
private static final String TAG = LoginPage.class.getSimpleName();
/*-- MAIN VARIABLES --*/
private String cam_file_data = null; // for storing camera file information
private ValueCallback<Uri> file_data; // data/header received after file selection
private ValueCallback<Uri[]> file_path; // received file(s) temp. location
private final static int file_req_code = 1;
/********** For Camera ************/
LinearLayout linearLayout;
Dialog dialog;
Button contnue;
AlertDialog alertDialog;
WebView mWebview;
private HomeViewModel homeViewModel;
private PermissionRequest mPermissionRequest;
private ProgressBar spinner;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login_page);
mWebview = findViewById(R.id.mWebview);
spinner = (ProgressBar) findViewById(R.id.progressBar);
spinner.setVisibility(View.VISIBLE);
///
Log.d("Login ", "Login ");
_setAndLoadWebView();
}//on create
private void _setAndLoadWebView(){
assert mWebview != null;
mWebview.setVisibility(View.VISIBLE);
WebSettings webSettings = mWebview.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setAllowFileAccess(true);
if (Build.VERSION.SDK_INT >= 21) {
webSettings.setMixedContentMode(0);
mWebview.setLayerType(View.LAYER_TYPE_HARDWARE, null);
} else {
mWebview.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
}
mWebview.getSettings().setDomStorageEnabled(true);
// Other webview options
mWebview.getSettings().setLoadWithOverviewMode(true);
//mWebview.getSettings().setUseWideViewPort(true);
//webView.getSettings().setUseWideViewPort(true);
//Other webview settings
mWebview.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
mWebview.setScrollbarFadingEnabled(false);
mWebview.getSettings().setBuiltInZoomControls(true);
mWebview.getSettings().setPluginState(WebSettings.PluginState.ON);
mWebview.getSettings().setAllowFileAccess(true);
mWebview.getSettings().setSupportZoom(true);
mWebview.setWebViewClient(new _webViewClientCallback());
//mWebview.loadUrl(webview_url);
mWebview.setWebChromeClient(new _WebChromeClient());
mWebview.loadUrl(initialURL);
}//_setAndLoadWebView
/*-- callback reporting if error occurs --*/
public class _webViewClientCallback extends WebViewClient {
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
Toast.makeText(LoginPage.this, "Failed loading app!", Toast.LENGTH_SHORT).show();
}
@TargetApi(android.os.Build.VERSION_CODES.M)
@Override
public void onReceivedError(WebView view, WebResourceRequest req, WebResourceError rerr) {
// Redirect to deprecated method, so you can use it in all SDK versions
onReceivedError(view, rerr.getErrorCode(), rerr.getDescription().toString(), req.getUrl().toString());
}
//If you will not use this method url links are open in new brower not in webview
public boolean shouldOverrideUrlLoading(WebView view, String url) {
// Stay within this webview and load url
view.loadUrl(url);
return true;
}//shouldOverrideUrlLoading
@Override
public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
handler.proceed(); // When an error occurs, ignore and go on
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
if (url.startsWith(initialURL)) {
spinner.setVisibility(View.GONE);
mWebview.loadUrl(webview_url);
}
spinner.setVisibility(View.GONE);
}
}//Callback
/*-- Chrome client class --*/
public class _WebChromeClient extends WebChromeClient {
/*-- handling input[type="file"] requests for android API 21+ --*/
public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) {
if (file_permission() && Build.VERSION.SDK_INT >= 21) {
file_path = filePathCallback;
Intent takePictureIntent = null;
boolean includePhoto = true;
if (includePhoto) {
takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
File photoFile = null;
try {
photoFile = create_image();
takePictureIntent.putExtra("PhotoPath", cam_file_data);
} catch (IOException ex) {
Log.e(TAG, "Image file creation failed", ex);
}
if (photoFile != null) {
cam_file_data = "file:" + photoFile.getAbsolutePath();
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile));
} else {
cam_file_data = null;
takePictureIntent = null;
}
}
}
Intent contentSelectionIntent = new Intent(Intent.ACTION_GET_CONTENT);
contentSelectionIntent.addCategory(Intent.CATEGORY_OPENABLE);
contentSelectionIntent.setType(file_type);
if (multiple_files) {
contentSelectionIntent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
}
Intent[] intentArray;
if (takePictureIntent != null) {
intentArray = new Intent[]{takePictureIntent};
} else {
intentArray = new Intent[0];
}
Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER);
chooserIntent.putExtra(Intent.EXTRA_INTENT, contentSelectionIntent);
chooserIntent.putExtra(Intent.EXTRA_TITLE, "File chooser");
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentArray);
startActivityForResult(chooserIntent, file_req_code);
return true;
} else {
return false;
}
}
}
请帮助我找到更好的解决方案。