How to stop multiple webview activities from being created

Question

On notification I start an activity which loads a webview. It works fine for the first time, but when I get a notification for the second time, it opens up a new webview, on top of the existing one.

I want to be able to just bring the activity to front and not create a new webview, since the page is already open in the background.

Function to handle notifications :

    private void handleNotification() {
    final Intent notificationIntent = new Intent(this, WebViewActivity.class);
    notificationIntent.setAction(Intent.ACTION_MAIN);
    notificationIntent.addCategory(Intent.CATEGORY_LAUNCHER);
    notificationIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(notificationIntent);
    Log.d(TAG, "Short lived task is done.");

    }

My web view activity :

public class WebViewActivity extends AppCompatActivity {

private static final String TAG = "WebViewActivity";
static boolean active = false;

private Bundle savedInstanceStatee;

private void loadWebView(){
    WebView myWebView = (WebView) findViewById(R.id.webview);
    WebSettings settings = myWebView.getSettings();
    // Enable Javascript
    settings.setJavaScriptEnabled(true);
    // Allow use of Local Storage
    settings.setDomStorageEnabled(true);
    // AppRTC requires third party cookies to work
    settings.setMediaPlaybackRequiresUserGesture(false);

    CookieManager cookieManager = CookieManager.getInstance();
    cookieManager.setAcceptThirdPartyCookies(myWebView, true);

    if (savedInstanceStatee != null){
        Log.d(TAG,"restoring instance");
        myWebView.restoreState(savedInstanceStatee);
    }else {
        Log.d(TAG,"no saved instance");

        //Change to your URL
        myWebView.loadUrl("https://example.com");
        myWebView.setWebChromeClient(new WebChromeClient() {
            @Override
            public void onPermissionRequest(final PermissionRequest request) {
                Log.d(TAG, "onPermissionRequest");
                Log.d(TAG,"permissions granted");
                request.grant(request.getResources());
            }
        });
    }
}


@Override
protected void onCreate(Bundle savedInstanceState) {
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
    super.onCreate(savedInstanceState);
    this.savedInstanceStatee = savedInstanceState;
    setContentView(R.layout.activity_web_view);

    //check for permissions and if granted load the webview
        loadWebView();
}

@Override
protected void onResume() {
    Log.i(TAG, "Resuming web view activity");
    super.onResume();

}

@Override
public void onStart() {
    Log.i(TAG, "Starting web view activity");

    super.onStart();
    active = true;
}

@Override
public void onStop() {
    Log.i(TAG, "Stopped web view activity");

    super.onStop();
    active = false;
}

@Override
protected void onSaveInstanceState(Bundle bundle) {
    WebView myWebView = (WebView) findViewById(R.id.webview);
    myWebView.saveState(bundle);
    super.onSaveInstanceState(bundle);
}
}

I tried using SaveInstanceState and restoreState of webview, but it didn't work.

Another one: https://stackoverflow.com/questions/19039189/intent-if-activity-is-running-bring-it-to-front-else-start-a-new-one-from-n?rq=1 — Rohit5k2, May 15 '19 at 08:28

score 0 · Answer 1 · answered May 15 '19 at 08:54

0

Change the Launch Mode of your Activity to SingleInstance while declaring it in the manifest. It should work.

answered May 15 '19 at 08:54

Kkba Shetty

31
5

How to stop multiple webview activities from being created

1 Answers1