I try to check the permission on button click and it always gives me -1
Here is my AndroidManifest file:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.natalia.assignment_2">
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<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>
Also i have compileSdkVersion 28, minSdkVersion 22 and targetSdkVersion 28.
In my MainActivity, I try to check the permissions and it always denied, because it returns -1
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button buttonLocate = (Button) findViewById(R.id.buttonLocate);
buttonLocate.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
askForPermission("android.permission.ACCESS_FINE_LOCATION");
});
}
private void askForPermission(String permission) {
if(MainActivity.this != null) {
if (PermissionChecker.checkSelfPermission(MainActivity.this, permission) != PackageManager.PERMISSION_GRANTED) {
// IT ALWAYS COMES TO THIS IF AND SHOWS -1
Toast.makeText(this, "" + String.valueOf(PermissionChecker.checkSelfPermission(MainActivity.this, permission)), Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "" + permission + " is already granted.", Toast.LENGTH_SHORT).show();
}
}
}
}
I tried many hours, but nothing helps...what could be a problem here?
askForPermission("android.permission.ACCESS_FINE_LOCATION");
This is what you had when passing into your method.
Try doing :
askForPermission("Manifest.permission.ACCESS_FINE_LOCATION");
This may work. If not, I checked some other articles and everywhere I looked, it wasn't passed in as a String.
Try using this without a String:
(PermissionChecker.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION)
Hope it works!
Related
I have watched multiple tutorials and followed this one on Youtube: https://www.youtube.com/watch?v=2O_7V6aEjgM
I do not understand why the location is not being tracked. Here is some of my code:
<?xml version="1.0" encoding="utf-8"?>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/Theme.TrackNet">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
--------------------------------------------------------------------------------------------
- above is the manifest file in my android studio project
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationListener = location -> {
txtLatitude.setText(location.getLatitude() + "");
txtLongitude.setText(location.getLongitude() + "");
if(location.hasAccuracy()){
txtAccuracy.setText(location.getAccuracy() + "");
}
if(location.hasAltitude()){
txtElevation.setText(location.getAltitude() + "");
}
if(location.hasSpeed()){
txtSpeed.setText(location.getSpeed() + "");
}
radioButton = findViewById(radioGroup.getCheckedRadioButtonId());
if(location.hasSpeed() && location.hasAltitude() && location.hasAccuracy()){
if(radioButton.getId() == R.id.switchLength){
building.addCoordinateLength(new Coordinate(location.getLatitude(),location.getLongitude(),location.getAltitude(),location.getAccuracy(),""));
}
else if(radioButton.getId() == R.id.switchWidth){
building.addCoordinateWidth(new Coordinate(location.getLatitude(),location.getLongitude(),location.getAltitude(),location.getAccuracy(),""));
}
}
else{
if(radioButton.getId() == R.id.switchLength){
building.addCoordinateLength(new Coordinate(location.getLatitude(),location.getLongitude(),0,0,""));
}
else if(radioButton.getId() == R.id.switchWidth){
building.addCoordinateWidth(new Coordinate(location.getLatitude(),location.getLongitude(),0,0,""));
}
}
Toast.makeText(getApplicationContext(),"Coordinate Recorded", Toast.LENGTH_SHORT).show();
};
above is some code on the onCreate method. I am using buttons to request location updates via a button
I run my code in emulator display contact number in toast.
When I run in my phone not display contact number in toast.
please help me for this solution.
this is my AndroidManifest.xml file code
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.my_call_detact">
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name=".PhoneStateReceiver">
<intent-filter>
<action android:name="android.intent.action.PHONE_STATE" />
</intent-filter>
</receiver>
</application>
</manifest>
this is my MainActivity.java file code
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final TelephonyManager telephonyManager = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
PhoneStateListener callStateListener = new PhoneStateListener() {
public void onCallStateChanged(int state, String incomingNumber)
{
if(state==TelephonyManager.CALL_STATE_RINGING){
Toast.makeText(getApplicationContext(),"Phone Is Riging", Toast.LENGTH_LONG).show()
}
if(state==TelephonyManager.CALL_STATE_OFFHOOK){
Toast.makeText(getApplicationContext(),"Phone is Currently in A call"+ incomingNumber, Toast.LENGTH_LONG).show()
}
if(state==TelephonyManager.CALL_STATE_IDLE){
Toast.makeText(getApplicationContext(),"phone is neither ringing nor in a call", Toast.LENGTH_LONG).show()
}
}
}
telephonyManager.listen(callStateListener,PhoneStateListener.LISTEN_CALL_STATE)
}
}
give me the solution or advice why this code is not working in phone?
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
I want get the install referrer value in my MainActivity. For that i am using two class
1) MainActivity
2) ReferrerReceiver
I got received install referrer value successfully in ReferrerReceiver class, i tested this using Toast control.
But i can not able to pass this value to MainActivity from ReferrerReceiver.
Bellow is i tried code. please any one help me.
Thanks for advance.
1) MainActivity.java
public class MainActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView tv1 = (TextView) findViewById(R.id.tv1);
Intent in1= getIntent();
String ldString = in1.getStringExtra("number");
tv1.setText(ldString);
}
}
2) ReferrerReceiver.java
public class ReferrerReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
if (!intent.getAction().equals("com.android.vending.INSTALL_REFERRER")) {
return;
}
Bundle bundle = intent.getExtras();
String phoneNumber = bundle.getString("referrer");
Intent i = new Intent(context, MainActivity.class);
i.putExtra("number", phoneNumber);
context.startActivity(i);
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.myreferrer.in"
android:versionCode="7"
android:versionName="1.0.6" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme"
>
<receiver android:name="com.myreferrer.in.ReferrerReceiver"
android:enabled="true">
<action android:name="com.android.vending.INSTALL_REFERRER" />
</intent-filter>
</receiver>
<activity
android:name=".MainActivity"
android:label="#string/app_name"
android:launchMode="singleTask"
>
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
This was i implemented in my project. its working for me. Use this code
(1) MainActivity.java
public class MainActivity extends Activity {
TextView tv1;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv1 = (TextView) findViewById(R.id.tv1);
}
public static void log(Context context, String string) {
if(string!=null) {
Toast.makeText(conte, "Referrer value is."+string, Toast.LENGTH_LONG).show();
tv1.setText(string);
}
}
(2) ReferrerReceiver.java
public class ReferrerReceiver extends BroadcastReceiver {
String referrer,rawReferrer;
public static String getReferrer(Context context) {
// Return any persisted referrer value or null if we don't have a referrer.
return context.getSharedPreferences("referrer", Context.MODE_PRIVATE).getString("referrer", null);
}
#Override
public void onReceive(Context context, Intent intent) {
try {
// Make sure this is the intent we expect - it always should be.
if ((null != intent) && (intent.getAction().equals("com.android.vending.INSTALL_REFERRER"))) {
// This intent should have a referrer string attached to it.
rawReferrer = intent.getStringExtra("referrer");
if (null != rawReferrer) {
// The string is usually URL Encoded, so we need to decode it.
referrer = URLDecoder.decode(rawReferrer, "UTF-8");
Toast.makeText(context, "ReferrerReceiver." + referrer, Toast.LENGTH_LONG).show();
MainActivity.log(context,"\nRaw referrer: " + rawReferrer +"\nReferrer: " + referrer);
MainActivity.log(context,referrer);
// Persist the referrer string.
context.getSharedPreferences("referrer", Context.MODE_PRIVATE).
edit().putString("referrer", referrer).commit();
} else {
Toast.makeText(context, "ReferrerReceiver." + referrer, Toast.LENGTH_LONG).show();
MainActivity.log(context,referrer);
context.getSharedPreferences("referrer", Context.MODE_PRIVATE).
edit().putString("referrer", referrer).commit();
}
} else {
Toast.makeText(context, "ReferrerReceiver intent value is null.", Toast.LENGTH_LONG).show();
MainActivity.log(context,referrer);
MainActivity.log(context,"intent value is nulll");
context.getSharedPreferences("referrer", Context.MODE_PRIVATE).
edit().putString("referrer", "intent value is nulll").commit();
}
}
catch (Exception e) {
//Toast.makeText(context, "ReferrerReceiver catch"+e, Toast.LENGTH_LONG).show();
MainActivity.log(context, e.toString());
}
}
}
(3) AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.myreferrer.in"
android:versionCode="7"
android:versionName="1.0.6" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme"
>
<receiver android:name="com.myreferrer.ReferrerReceiver" android:exported="true">
<intent-filter>
<action android:name="com.android.vending.INSTALL_REFERRER"></action>
</intent-filter>
</receiver>
<activity
android:name=".MainActivity"
android:label="#string/app_name"
android:launchMode="singleTask"
>
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
(4) sample link:
https://play.google.com/store/apps/details?id=your_package_name&referrer=Welcome
You are using
Intent in1 = new Intent();
String ldString = in1.getStringExtra("KEY");
you are declaring new intent which is wrong, and also key you put is also wrong, which should be number
Replace it With,
Intent intent= getIntent();
String ldString = intent.getStringExtra("number");
you have declared your activity as"single Task" in Manifest;so if an instance of your
activity is already launched the system will create (NewIntent) to re_lunch your
activity.try to put this code before onCreate():
#Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
// NOW getIntent() should always return the recent
setIntent(intent);
}
to get all the time the newest intent with the new extras.
When I rotate my screen, the WebView reloads the whole page. I can't have this since some of my content contains dynamic/random material. Currently when rotated the screen reloads the original URL from the loadUrl() method.
Any idea what's wrong with my code?
MainActivity.java
package com.mark.myapp;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Menu;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class MainActivity extends Activity {
WebView web;
String webURL = "http://www.google.co.uk/";
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState != null)
((WebView)findViewById(R.id.web)).restoreState(savedInstanceState);
web = (WebView) findViewById(R.id.web);
web.getSettings().setJavaScriptEnabled(true);
web.loadUrl(webURL);
web.setPadding(0, 0, 0, 0);
web.getSettings().setLoadWithOverviewMode(true);
web.getSettings().setUseWideViewPort(true);
web.getSettings().setSupportZoom(true);
web.getSettings().setBuiltInZoomControls(true);
web.setWebViewClient(new HelloWebViewClient());
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
private class HelloWebViewClient extends WebViewClient {
public boolean shouldOverrideUrlLoading(WebView web, String url) {
web.loadUrl(url);
return true;
}
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && web.canGoBack()) {
web.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
}
AndroidManifest.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mark.myapp"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".MainActivity"
android:configChanges="orientation|keyboardHidden">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.INTERNET"/>
</manifest>
I think the main problem is that you call web.loadUrl(webURL); also when savedInstanceState != null
EDIT
Try:
if (savedInstanceState == null)
{
web.loadUrl(webURL);
}
EDIT2: You also need the onSaveInstanceState and onRestoreInstanceState override.
#Override
protected void onSaveInstanceState(Bundle outState )
{
super.onSaveInstanceState(outState);
web.saveState(outState);
}
#Override
protected void onRestoreInstanceState(Bundle savedInstanceState)
{
super.onRestoreInstanceState(savedInstanceState);
web.restoreState(savedInstanceState);
}
Note: Please also add in your AndroidManifest.xml in your Activity
android:configChanges="orientation|screenSize"
Thanks
EDIT: Found a more suitable solution.
NEW:
In AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.Example.WebviewSample">
<application
<activity android:name=".WebViewActivity"
<!-- ADD THIS -->
android:configChanges="orientation|screenSize">
</activity>
</application>
</manifest>
In WebViewActivity.java file add this to onCreate() method
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
wView = (WebView) findViewById(R.id.webView);
if (savedInstanceState == null) {
wView.loadUrl("https://google.com");
}
}
also update onSaveInstanceState
#Override
protected void onSaveInstanceState(Bundle outState)
{
super.onSaveInstanceState(outState);
wView.saveState(outState);
}
and onRestoreInstanceState
#Override
protected void onRestoreInstanceState(Bundle savedInstanceState)
{
super.onRestoreInstanceState(savedInstanceState);
wView.restoreState(savedInstanceState);
}
OLD:
No java coding needed.
use this in your manifest file.
android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
like:
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.Example.WebviewSample.webviewsample"
android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
in tag (manifest)
android:configChanges="orientation|screenSize"
Adding android:configChanges="orientation|screenSize" in manifest works for me
<activity
android:name="com.example.HelloWorld.WebActivity"
android:label="#string/title_activity_web"
android:configChanges="orientation|screenSize" >
</activity>
I don't believe this will work anymore. In my case, restoring state using WebView.restore(Bundle savedInstanceState) still triggers a reload of the url.
Looking at the docs for restoreState() you'll see it says:
If it is called after this WebView has had a chance to build state (load pages, create a back/forward list, etc.) there may be undesirable side-effects.
and
Please note that this method no longer restores the display data for this WebView.
Props to #e4c5 for pointing me in the right direction in his answer
And of course, the extreme course of action would be to prevent orientation changes from triggering activity destruction/creation. Documentation for how to do this is here
Add this code in Manifest
<activity
...
android:configChanges="orientation|screenSize">
Try this in your manifest file:
android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
Place this in the Manifest.xml file activity:
android:configChanges="orientation|screenSize"
Here is an example:
<activity android:name=".MainActivity"
android:label="#string/app_name"
android:theme="#style/AppTheme.NoActionBar"
android:configChanges="orientation|screenSize">
<intent-filter>
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
Override the onConfigChange method to avoid reloading data on orientation change
on your activity in AndroidMainfest file.
android:configChanges="orientation|keyboardHidden"
and have these as well in your WebView settings
webview.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
webview.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
webview.loadUrl("Your URL To Load");
As quoted here,
Caution: Beginning with Android 3.2 (API level 13), the "screen size"
also changes when the device switches between portrait and landscape
orientation. Thus, if you want to prevent runtime restarts due to
orientation change when developing for API level 13 or higher (as
declared by the minSdkVersion and targetSdkVersion attributes), you
must include the "screenSize" value in addition to the "orientation"
value. That is, you must decalare
android:configChanges="orientation|screenSize". However, if your
application targets API level 12 or lower, then your activity always
handles this configuration change itself (this configuration change
does not restart your activity, even when running on an Android 3.2 or
higher device).
setting android:configChanges="orientation|screenSize" on your activity will resolve this issue.
Also, take note of the following
Remember: When you declare your activity to handle a configuration
change, you are responsible for resetting any elements for which you
provide alternatives. If you declare your activity to handle the
orientation change and have images that should change between
landscape and portrait, you must re-assign each resource to each
element during onConfigurationChanged().
This solution works well for me:
(1) In AndroidManifest.xml add this line
android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
Like this (and like the answers above)
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity
android:name=".MainActivity"
android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
android:label="#string/app_name"
android:theme="#style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
(2) Then in MainActivity.java verify savedInstanceState
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mainContext = getApplicationContext();
----
myWebView = (WebView) findViewById(R.id.webView);
prepareWebView();
myWebView.addJavascriptInterface(myJavaScriptInterface, "WEB2Android");
if (savedInstanceState == null) {
myWebView.post(new Runnable() {
#Override
public void run() {
myWebView.loadUrl("http://www.appbiz.ro/foto_konta");
}
});
}
----
}
(3) and then:
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
}
#Override
protected void onSaveInstanceState(Bundle outState )
{
super.onSaveInstanceState(outState);
myWebView.saveState(outState);
}
#Override
protected void onRestoreInstanceState(Bundle savedInstanceState)
{
super.onRestoreInstanceState(savedInstanceState);
myWebView.restoreState(savedInstanceState);
}
Add this in Androidmanifest.xml:
<activity android:name=".MyActivity"
android:configChanges="orientation|screenSize|screenLayout|keyboardHidden">
Now, when one of these configurations change, MyActivity does not restart. Instead, MyActivity receives a call to onConfigurationChanged().
Add this:
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Checks the orientation of the screen
if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
Toast.makeText(this, "landscape", Toast.LENGTH_SHORT).show();
}
else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {
Toast.makeText(this, "portrait", Toast.LENGTH_SHORT).show();
}
}