Fix login issue with internet access. Better solution to check internet connection

with broadcast receiver. Prioritize token login.

app/src/main/java/org/mian/gitnex/activities/LoginActivity.java

@@ -23,6 +23,7 @@ import androidx.appcompat.app.AlertDialog;
 import com.tooltip.Tooltip;
 import org.mian.gitnex.R;
 import org.mian.gitnex.clients.RetrofitClient;
+import org.mian.gitnex.helpers.NetworkObserver;
 import org.mian.gitnex.helpers.Toasty;
 import org.mian.gitnex.helpers.VersionCheck;
 import org.mian.gitnex.models.GiteaVersion;
@@ -65,7 +66,7 @@ public class LoginActivity extends BaseActivity implements View.OnClickListener
         super.onCreate(savedInstanceState);
 
         TinyDB tinyDb = new TinyDB(getApplicationContext());
-        boolean connToInternet = AppUtil.haveNetworkConnection(getApplicationContext());
+        NetworkObserver networkMonitor = new NetworkObserver(this);
 
         loginButton = findViewById(R.id.login_button);
         instanceUrlET = findViewById(R.id.instance_url);
@@ -105,30 +106,39 @@ public class LoginActivity extends BaseActivity implements View.OnClickListener
 
         info_button.setOnClickListener(infoListener);
 
-        if(!connToInternet) {
+        loginMethod.setOnCheckedChangeListener((group, checkedId) -> {
 
-            Toasty.info(getApplicationContext(), getResources().getString(R.string.checkNetConnection));
-            return;
+            if(checkedId == R.id.loginToken) {
 
-        }
+                loginUidET.setVisibility(View.GONE);
+                loginPassword.setVisibility(View.GONE);
+                otpCode.setVisibility(View.GONE);
+                otpInfo.setVisibility(View.GONE);
+                loginTokenCode.setVisibility(View.VISIBLE);
 
-        loginMethod.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
-            @Override
-            public void onCheckedChanged(RadioGroup group, int checkedId) {
-                if(checkedId == R.id.loginUsernamePassword){
-                    loginUidET.setVisibility(View.VISIBLE);
-                    loginPassword.setVisibility(View.VISIBLE);
-                    otpCode.setVisibility(View.VISIBLE);
-                    otpInfo.setVisibility(View.VISIBLE);
-                    loginTokenCode.setVisibility(View.GONE);
-                } else {
-                    loginUidET.setVisibility(View.GONE);
-                    loginPassword.setVisibility(View.GONE);
-                    otpCode.setVisibility(View.GONE);
-                    otpInfo.setVisibility(View.GONE);
-                    loginTokenCode.setVisibility(View.VISIBLE);
-                }
             }
+            else {
+
+                loginUidET.setVisibility(View.VISIBLE);
+                loginPassword.setVisibility(View.VISIBLE);
+                otpCode.setVisibility(View.VISIBLE);
+                otpInfo.setVisibility(View.VISIBLE);
+                loginTokenCode.setVisibility(View.GONE);
+
+            }
+
+        });
+
+        networkMonitor.onInternetStateListener(isAvailable -> {
+
+            if(isAvailable) {
+                enableProcessButton();
+            }
+            else {
+                disableProcessButton();
+                Toasty.info(getApplicationContext(), getResources().getString(R.string.checkNetConnection));
+            }
+
         });
 
         //login_button.setOnClickListener(this);

app/src/main/java/org/mian/gitnex/helpers/NetworkObserver.java

@@ -0,0 +1,82 @@
+package org.mian.gitnex.helpers;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.net.ConnectivityManager;
+import android.net.NetworkInfo;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.lifecycle.Lifecycle;
+import androidx.lifecycle.LifecycleObserver;
+import androidx.lifecycle.OnLifecycleEvent;
+
+/**
+ * Author M M Arif
+ */
+
+public class NetworkObserver implements LifecycleObserver {
+
+    private ConnectivityManager mConnectivityMgr;
+    private Context mContext;
+    private NetworkStateReceiver mNetworkStateReceiver;
+
+    public interface ConnectionStateListener {
+        void onAvailable(boolean isAvailable);
+    }
+
+    public NetworkObserver(Context context) {
+        mContext = context;
+        mConnectivityMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
+        ((AppCompatActivity) mContext).getLifecycle().addObserver(this);
+    }
+
+
+    public void onInternetStateListener(ConnectionStateListener listener) {
+
+        mNetworkStateReceiver = new NetworkStateReceiver(listener);
+        IntentFilter intentFilter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
+        mContext.registerReceiver(mNetworkStateReceiver, intentFilter);
+
+    }
+
+
+    @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
+    public void onDestroy() {
+
+        ((AppCompatActivity) mContext).getLifecycle().removeObserver(this);
+
+        if (mNetworkStateReceiver != null) {
+            mContext.unregisterReceiver(mNetworkStateReceiver);
+        }
+
+    }
+
+
+    public class NetworkStateReceiver extends BroadcastReceiver {
+
+        ConnectionStateListener mListener;
+
+        public NetworkStateReceiver(ConnectionStateListener listener) {
+            mListener = listener;
+        }
+
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            if (intent.getExtras() != null) {
+                NetworkInfo activeNetworkInfo = mConnectivityMgr.getActiveNetworkInfo();
+
+                if (activeNetworkInfo != null && activeNetworkInfo.getState() == NetworkInfo.State.CONNECTED) {
+
+                    mListener.onAvailable(true); // connected
+
+                } else if (intent.getBooleanExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, Boolean.FALSE)) {
+
+                    mListener.onAvailable(false); // disconnected
+
+                }
+            }
+        }
+    }
+
+}

app/src/main/res/layout/activity_login.xml

@@ -45,20 +45,21 @@
             android:background="@drawable/shape_inputs"
             android:orientation="vertical">
 
-            <RadioButton
-                android:id="@+id/loginUsernamePassword"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:text="@string/loginViaPassword"
-                android:checked="true"
-                android:layout_marginEnd="30dp"
-                android:theme="@style/radioButtonsInDarkTheme"
-                android:textColor="?attr/primaryTextColor"/>
             <RadioButton
                 android:id="@+id/loginToken"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:text="@string/copyToken"
+                android:checked="true"
+                android:theme="@style/radioButtonsInDarkTheme"
+                android:textColor="?attr/primaryTextColor"/>
+
+            <RadioButton
+                android:id="@+id/loginUsernamePassword"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="@string/loginViaPassword"
+                android:layout_marginEnd="30dp"
                 android:theme="@style/radioButtonsInDarkTheme"
                 android:textColor="?attr/primaryTextColor"/>
 
@@ -129,7 +130,8 @@
             android:textColorHint="?attr/hintColor"
             android:textColorHighlight="?attr/hintColor"
             android:hint="@string/userName"
-            android:inputType="text" />
+            android:inputType="text"
+            android:visibility="gone" />
 
         <EditText
             android:id="@+id/login_passwd"
@@ -146,7 +148,8 @@
             android:textColorHint="?attr/hintColor"
             android:textColorHighlight="?attr/hintColor"
             android:hint="@string/passWord"
-            android:inputType="textPassword" />
+            android:inputType="textPassword"
+            android:visibility="gone" />
 
         <EditText
             android:id="@+id/otpCode"
@@ -163,7 +166,8 @@
             android:textColorHint="?attr/hintColor"
             android:textColorHighlight="?attr/hintColor"
             android:hint="@string/loginOTP"
-            android:inputType="number" />
+            android:inputType="number"
+            android:visibility="gone" />
 
         <EditText
             android:id="@+id/loginTokenCode"
@@ -181,7 +185,7 @@
             android:textColorHighlight="?attr/hintColor"
             android:hint="@string/copyToken"
             android:inputType="text"
-            android:visibility="gone" />
+            android:visibility="visible" />
 
         <TextView
             android:id="@+id/otpInfo"
@@ -192,7 +196,8 @@
             android:textSize="12sp"
             android:paddingStart="10dp"
             android:paddingEnd="10dp"
-            android:gravity="end" />
+            android:gravity="end"
+            android:visibility="gone" />
 
         <Button
             android:layout_width="match_parent"