I am making an application which uses webview to display content from a url for a logged in user.It's a very basic and small application. My problem is that the user logs out and some other user logs in, the previously loaded content(stale content) is displayed. Here's the java class:
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.util.Log;
import android.view.View;
import android.webkit.WebResourceError;
import android.webkit.WebResourceRequest;
import android.webkit.WebResourceResponse;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import java.util.HashMap;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
public class WebViewActivity extends Activity {
boolean clearHistory;
private final String API_KEY = "apiKey";
private final String TOKEN = "token";
private WebView mWebView;
String TAG="Response";
TextView topbar;
LinearLayout parentLayout;
HashMap<String, String> maps = new HashMap<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_webview);
mWebView =(WebView)findViewById(R.id.webview1);
mWebView.stopLoading();
topbar=(TextView)findViewById(R.id.topbar);
parentLayout=(LinearLayout)findViewById(R.id.parentLayout);
SharedPreferences pref = getSharedPreferences("MyPref", 0);
final String webviewUrl = pref.getString("webviewUrl", "");
final String token = pref.getString("app_token", "");
mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
topbar.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(WebViewActivity.this);
alertDialog.setTitle("Confirm Logout");
alertDialog.setMessage("Are you sure you want to logout?");
alertDialog.setIcon(R.drawable.smlalo);
alertDialog.setPositiveButton("Logout", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
SharedPreferences pref = getSharedPreferences(
"MyPref", 0);
SharedPreferences.Editor editor = pref.edit();
editor.putString("webviewUrl", "");
editor.putString("app_token", "");
editor.commit();
maps.put(TOKEN,token);
maps.put(API_KEY, BuildConfig.API_KEY_VALUE);
RestClient.getApiInterface().logout(maps).enqueue(new Callback<String>() {
@Override
public void onResponse(Call<String> call, Response<String> response) {
startActivity(new Intent(WebViewActivity.this, MainActivity.class));
finish();
}
@Override
public void onFailure(Call<String> call, Throwable t) {
}
});
}
});
// Setting Negative "NO" Button
alertDialog.setNegativeButton("NO", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.show();
}
});
final ProgressDialog progressDialog = ProgressDialog.show(WebViewActivity.this, "", "Loading...");
mWebView.setWebViewClient(new WebViewClient() {
@Override
public void onLoadResource(WebView view, String url) {
view.clearHistory();
super.onLoadResource(view,url);
}
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon)
{
progressDialog.show();
super.onPageStarted(view, url, favicon);
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
Log.i(TAG, "Processing webview url click...");
// view.loadUrl(url);
super.shouldOverrideUrlLoading(view, url);
return false;
}
@TargetApi(Build.VERSION_CODES.M)
@Override
public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
// view.loadUrl(request.getUrl().toString());
super.shouldOverrideUrlLoading(view, request);
return false;
}
public void onPageCommitVisible(WebView view, String url) {
view.clearHistory();
view.clearCache(true);
}
@Override
public void onPageFinished(WebView view, String url) {
Log.i(TAG, "Finished loading URL: " +url);
topbar.setVisibility(View.VISIBLE);
if (progressDialog.isShowing()) {
progressDialog.dismiss();
}
/*if (clearHistory)
{
clearHistory = false;
mWebView.clearHistory();
mWebView.clearCache(true);
if (progressDialog.isShowing()) {
progressDialog.dismiss();
}
}*/
super.onPageFinished(view, url);
}
@Override
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
Log.e(TAG, "Error: " + description);
new android.app.AlertDialog.Builder(WebViewActivity.this)
.setTitle("Error")
.setMessage(description)
.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// continue with delete
}
})
.setIcon(android.R.drawable.ic_dialog_alert)
.show();
if (progressDialog.isShowing()) {
progressDialog.dismiss();
}
super.onReceivedError(view,errorCode,description,failingUrl);
}
@TargetApi(Build.VERSION_CODES.M)
@Override
public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
new android.app.AlertDialog.Builder(WebViewActivity.this)
.setTitle("Error")
.setMessage(error.getDescription())
.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// continue with delete
}
})
.setIcon(android.R.drawable.ic_dialog_alert)
.show();
super.onReceivedError(view, request, error);
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
@Override
public void onReceivedHttpError(WebView view,
WebResourceRequest request, WebResourceResponse errorResponse) {
Toast.makeText(WebViewActivity.this, "WebView Error" + errorResponse.getReasonPhrase(), Toast.LENGTH_SHORT).show();
super.onReceivedHttpError(view, request, errorResponse);
}
});
/*mWebView.loadUrl("about:blank");
mWebView.reload();*/
mWebView.loadUrl(webviewUrl);
// clearHistory = true;
// mWebView.reload();
}
}
and here's the layout file:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:id="@+id/parentLayout"
android:layout_height="fill_parent"
tools:context=".SplashActivity">
<RelativeLayout
android:background="@color/colorPrimary"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight=".2"
android:padding="10dp"
android:id="@+id/topbarbbb">
<ImageView
android:text="@string/coachapp"
android:layout_width="wrap_content"
android:layout_centerVertical="true"
android:src="@drawable/smlalo"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerInParent="true"
android:id="@+id/imageView2" />
<TextView
android:text="Logout"
android:textSize="12sp"
android:layout_height="wrap_content"
android:textColor="#ffffff"
android:visibility="gone"
style="@style/Base.TextAppearance.AppCompat.Button"
android:id="@+id/topbar"
android:layout_width="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerInParent="true">
</TextView>
</RelativeLayout>
<WebView android:id="@+id/webview1"
android:layout_below="@+id/topbarbbb"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1" />
</LinearLayout>
Also to mention, I have debugged and researched for this. The sharedpreferences are not a problem, the url being retrieved is the one I want to display. It opens properly in the browser. Have tried all the previous answers like Clear previously loaded Webview's content before loading the next one,clear webview history and this one: Destroying the WebView. None of these works for me.
I'd really appreciate some help.
