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How can I stop my Android webview app from refreshing when I rotate my phone?

I am trying to complete my org's first app (we lost our dev due to health issues) and it seems to be working except that when the phone is rotated it refreshes back to the login screen. I realize that this question was answered previously here but this information is 4 years old and I get some compiling errors.
Here is our code - I really hope that someone can help as I am completely new to this and not really a dev myself, but I feel like what we have is close to a solution.
Manifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="ca.ruffarc.flytest">
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/Theme.AppCompat.NoActionBar">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Main Activity:
package ca.ruffarc.flytest;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class MainActivity extends AppCompatActivity {
private WebView webView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webView = (WebView) findViewById(R.id.webview);
webView.setWebViewClient(new MyBrowser());
webView.getSettings().setLoadsImagesAutomatically(true);
webView.getSettings().setJavaScriptEnabled(true);
webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
webView.loadUrl("https://flyapp.ca/en/authentication");
}
private class MyBrowser extends WebViewClient {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
}
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {
webView.goBack();
return true;
}
else
{
finish();
}
return super.onKeyDown(keyCode, event);
}
}

If you look at the AndroidManifest.xml from the link you gave you will see that <activity> has property android:configChanges="orientation|keyboardHidden".
So you need to do the same for your activity in the manifest with small difference:
android:configChanges="orientation|screenSize|keyboardHidden".
Here's a full example of Manifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="ca.ruffarc.flytest">
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/Theme.AppCompat.NoActionBar">
<activity android:name=".MainActivity"
android:configChanges="orientation|screenSize|keyboardHidden">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

What forces android activity to be destroyed when launching another activity

I'm trying to add in-app purchases and when I call OpenIabHelper::launchPurchaseFlow function:
I see Google Play purchase window
onStop and onDestroy are executed in my main activity without calls to onActivityResult
So in the end I left with GooglePlay window and my dead app
I tried to start another activity via startActivityForResult and it worked fine
(nothing was destroyed and onActivityResult was called), so it seems that problem is with OpenIAB library
Therefore there's my question:
What can possibly force my activity to be destroyed after calling OpenIabHelper::launchPurchaseFlow ?
It doesn't seem to be system because it has enough memory and as I said startActivityForResult works fine.
Also there's no exceptions being trown so I'm puzzled
Any help would be appreciated
MyActivity.java
public class MyActivity extends AppCompatActivity {
private OpenIabHelper m_helper;
private Boolean m_bOpenIabInitialized = false;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
OpenIabHelper.Options.Builder builder = new OpenIabHelper.Options.Builder()
.addAvailableStores(new GooglePlay(this,null))
.addPreferredStoreName(OpenIabHelper.NAME_GOOGLE)
.setStoreSearchStrategy(OpenIabHelper.Options.SEARCH_STRATEGY_INSTALLER_THEN_BEST_FIT)
.setVerifyMode(OpenIabHelper.Options.VERIFY_SKIP)
.setCheckInventory(false);
m_helper = new OpenIabHelper(this, builder.build());
m_helper.startSetup(new IabHelper.OnIabSetupFinishedListener() {
public void onIabSetupFinished(IabResult result) {
m_bOpenIabInitialized = result.isSuccess();
}
});
}
public void onListViewItemClicked(String sku, String payload) {
if (m_bOpenIabInitialized == null || !m_bOpenIabInitialized) return;
m_helper.launchPurchaseFlow(this, sku, 10001, null, payload);
}
#Override
public void startActivityForResult(Intent intent, int RequestCode) {
// never reaches here
Log.d(TAG, "startActivityForResult()");
}
#Override
protected void onActivityResult(int RequestCode, int ResultCode, Intent data) {
// never reaches here
Log.d(TAG, "onActivityResult()");
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example" >
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CALL_PHONE" />
<uses-permission android:name="com.android.vending.BILLING" />
<application
android:allowBackup="true"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme" >
<activity
android:name=".MyActivity"
android:label="#string/app_name"
android:theme="#style/AppTheme.NoActionBar"
android:configChanges="orientation|screenSize|keyboardHidden|screenLayout">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

Have you tried changing the activity's launchMode? Maybe the singleTop launch mode will preserve your activity:
<activity
android:name=".MyActivity"
android:label="#string/app_name"
android:theme="#style/AppTheme.NoActionBar"
android:configChanges="orientation|screenSize|keyboardHidden|screenLayout"
android:launchMode="singleTop">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
You can find more about launch modes here:
https://developer.android.com/guide/topics/manifest/activity-element.html#lmode

Interstitial ad not being loaded?

I just created a Interstitial add in my test app. Went fairly easy, but now I want to add one to my main application and I cannot seem to load it.
This is what my android launcher looks like:
../
protected void onCreate (Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
AndroidApplicationConfiguration config = new AndroidApplicationConfiguration();
initialize(new GameOfClaws(this), config);
//initialize ads...
interstitialAd = new InterstitialAd(this);
interstitialAd.setAdUnitId(getString(R.string.interstitial_ad));
//Load add
requestNewInterstitial();
interstitialAd.setAdListener(new AdListener() {
#Override
public void onAdClosed() {
super.onAdClosed();
requestNewInterstitial();
}
#Override
public void onAdLoaded()
{
Gdx.app.log(TAG, "Ad loaded!");
//interstitialAd.show();
}
});
}
private void requestNewInterstitial()
{
AdRequest adRequest = new AdRequest.Builder()
.build();
interstitialAd.loadAd(adRequest);
}
#Override
public void displayInterstitialAd() {
runOnUiThread(new Runnable() {
#Override
public void run() {
if (interstitialAd.isLoaded()) {
interstitialAd.show();
}
else
{
Gdx.app.log("MainActivity", "Add not loaded!");
}
}
});
}
/..
I simply call a interface method in the show method of my menuScreen to run the same method in the AndroidLauncher.
resolver.displayInterstitialAd();
It's basically the same as my working test app but there I load the interstitial by pressing a button.
This is my manifest:
<uses-sdk android:minSdkVersion="9" android:targetSdkVersion="22" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/GdxTheme" >
<meta-data android:name="com.google.android.gms.games.APP_ID"
android:value="#string/app_id" />
<meta-data android:name="com.google.android.gms.version"
android:value="#integer/google_play_services_version"/>
<activity
android:name="com.madmenyo.gameofclaws.android.AndroidLauncher"
android:label="#string/app_name"
android:screenOrientation="landscape"
android:configChanges="keyboard|keyboardHidden|orientation|screenSize">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
The only things that are different is that my test app is in portrait mode and it has been uploaded a while ago but remains as a testing app and not published. My current app has just been uploaded for testing these ads and the play store. The play store works fine. I also changed the ad ID to the correct ID I got on the Admob website.

Add the following in manifest file
<activity
android:name="com.google.android.gms.ads.AdActivity"
android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
android:screenOrientation="portrait"
android:theme="#android:style/Theme.Translucent" >
</activity>

BroadCastReceiver doesn't work when return button

I have a BroadCastReceiver and since I don't want it to keep working when the application is uninstalled so I removed the declaration of the receiver from the manifest . By doing this the receiver will only work when the application is running . That's good so far but I have a little problem which is if the user clicks "home" button on his device to get back to his device's main screen the receiver works in the background , but when he clicks "back" button the receiver will stop working . I want it to work either the user clicked home button or back button. So how to solve this problem and thanks in advance.
**Note : I'm activating/deactivating the receiver using this code :
private BroadCastReceiver myBroadcastReceiver = new BroadCastReceiver();
#Override
public void onStart() {
super.onStart();
registerReceiver(myBroadcastReceiver, new IntentFilter(Telephony.Sms.Intents.SMS_RECEIVED_ACTION));
}
#Override
public void onDestroy() {
super.onDestroy();
unregisterReceiver(myBroadcastReceiver);
}
&& my manifest is :
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.test.test"
android:versionCode="9"
android:versionName="8.1" >
<uses-sdk
android:minSdkVersion="9"
android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.SEND_SMS"/>
<uses-permission android:name="android.permission.RECEIVE_SMS"/>
<application
android:allowBackup="true"
android:icon="#drawable/danger"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<intent-filter android:priority="2147483647">
<action android:name="android.provider.Telephony.SMS_RECEIVED" />
</intent-filter>
<activity
android:name="com.aaf.nuclearalert.MainActivity"
android:label="#string/app_name"
android:screenOrientation="landscape"
>
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
*Update 1 :
public void onBackPressed() {
registerReceiver(myBroadcastReceiver, new IntentFilter(Telephony.Sms.Intents.SMS_RECEIVED_ACTION));
}

Repaint Activity through Service

I use my Main Activity to paint Text. Now Ive a Service in Background that listens to a bluetooth device. If a button on the device is pressed I insert values in the local database and want to repaint the correct value in my Main Activity. Everything works fine - just the repaint does not work, because i cant call the invalidate() method from my Service.
I tried with a BroadCastReceiver but i think i misunderstood something.
This is my Method in my Service "ControllerService"
private void insertToDB(int iWert, char c) {
if(zt.getJoystickMoved().x == iWert) {
sendOrderedBroadcast(i,null);
Log.i("Broadcast","send!");
//in this block i want to notify the Activity
}
}
Here is my Main Activity
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
registerReceiver(resetReceiver, new IntentFilter("my.intent.INTENT_NAME"));
}
public BroadcastReceiver resetReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
Log.i("Broadcast", "got Broadcast!");
MainActivity.this.cc.invalidate();
//cc.invalidate() repaints my Activity
//cc is a View with the paint Logic inside
this.setResultCode(Activity.RESULT_OK);
}
}
My Broadcast Receiver in my Main Activity does not receive anything ...
I hope someone could help me with my Problem.
In my AndroidManifest is this code
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.test.countV1"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="10" />
<uses-permission android:name="android.permission.VIBRATE"/>
<uses-permission
android:name="android.permission.BLUETOOTH" />
<uses-permission
android:name="android.permission.BLUETOOTH_ADMIN" />
<application android:icon="#drawable/icon" android:label="#string/app_name" android:name="com.test.data.ListHelper">
<activity android:name=".MainActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<action android:name="my.intent.INTENT_NAME"/>
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:label="PreferencesActivity" android:name="PreferencesActivity"></activity>
<activity android:name="ZtPreferencesActivity" android:label="ZtPreferencesActivity"></activity>
<activity android:name="customizePreferences"></activity>
<activity android:name="ControllerActivity"></activity>
<service android:name="com.test.services.ControllerService"></service>
<activity android:name="BatteryActivity"></activity>
</application>
</manifest>