internet check adn singleton class

.idea/gradle.xml

@@ -3,6 +3,9 @@
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
+        <compositeConfiguration>
+          <compositeBuild compositeDefinitionSource="SCRIPT" />
+        </compositeConfiguration>
         <option name="distributionType" value="DEFAULT_WRAPPED" />
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
         <option name="modules">

app/src/main/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.example.infiniteLoop.parkingo">
-
+    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE">
+    </uses-permission>
+    <uses-permission android:name="android.permission.INTERNET">    </uses-permission>
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"

app/src/main/java/com/example/infiniteLoop/parkingo/login_activity.java

@@ -3,13 +3,17 @@ package com.example.infiniteLoop.parkingo;
 import android.app.Activity;
 import android.app.AlertDialog;
 import android.app.ProgressDialog;
+import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
+import android.net.ConnectivityManager;
+import android.net.NetworkInfo;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.View;
 import android.widget.Button;
 import android.widget.EditText;
+import android.widget.TextView;
 import android.widget.Toast;
 
 import androidx.annotation.NonNull;
@@ -28,6 +32,7 @@ public class login_activity extends Activity {
     EditText username,password;
     Button login_btn;
     ProgressDialog progress;
+    TextView logmsg;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -35,11 +40,50 @@ public class login_activity extends Activity {
         username=findViewById(R.id.username);
         password=findViewById(R.id.password);
         login_btn=findViewById(R.id.login_btn);
+        logmsg=findViewById(R.id.logmsg);
+        //checking if internet is on or not
+        final ConnectivityManager conMgr=(ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
+        if ( conMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState() == NetworkInfo.State.CONNECTED
+                || conMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.CONNECTED ) {
+
+            // notify user you are online
+            Toast.makeText(login_activity.this,"YOU ARE ONLINE",Toast.LENGTH_SHORT).show();
+
+        }
+        else if ( conMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState() == NetworkInfo.State.DISCONNECTED
+                || conMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.DISCONNECTED) {
+
+            // notify user you are not online
+            Toast.makeText(login_activity.this,"YOU ARE OFFLINE",Toast.LENGTH_SHORT).show();
+
+        }
+
         login_btn.setOnClickListener(new View.OnClickListener() {
             @Override
+
             public void onClick(View view) {
                 //Toast.makeText(login_activity.this,"button clicked",Toast.LENGTH_SHORT).show();
+                logmsg.setVisibility(View.INVISIBLE);
+
+
+                if ( conMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState() == NetworkInfo.State.CONNECTED
+                        || conMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.CONNECTED) {
 
+                    // notify user you are not online
+                    Toast.makeText(login_activity.this,"YOU ARE OFFLINE",Toast.LENGTH_SHORT).show();
+                    logmsg.setText("You are online");
+                    logmsg.setVisibility(View.INVISIBLE);
+
+                }
+                else if ( conMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState() == NetworkInfo.State.DISCONNECTED
+                        || conMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.DISCONNECTED) {
+
+                    // notify user you are not online
+                    Toast.makeText(login_activity.this,"YOU ARE OFFLINE",Toast.LENGTH_SHORT).show();
+                    logmsg.setText("You are offline");
+                    logmsg.setVisibility(View.VISIBLE);
+                    return;
+                }
                 String uname=username.getText().toString().trim();
                 String pass=password.getText().toString().trim();
                 if(uname.isEmpty() || pass.isEmpty()){
@@ -47,12 +91,21 @@ public class login_activity extends Activity {
                     username.requestFocus();
                 }
                 else{
+
                         sqlite_ops so=new sqlite_ops(login_activity.this);
                         //so.insert_login_details();
                     login li=new login();
                     li.setPass(uname);
                     li.setUname(pass);
                     so.fetch_login_details(li,login_activity.this);
+
+                    //com.example.infiniteLoop.parkingo.userInfo setting to use across pages
+                    userInfo uinfo=userInfo.getInstance();
+                    uinfo.setU_name("Shailesh");
+                    uinfo.setUsername("shady");
+
+
+                    //progress window
                     progress = new ProgressDialog(login_activity.this);
                     progress.setTitle("Loading");
                     progress.setMessage("Wait while loading...");
@@ -81,6 +134,7 @@ public class login_activity extends Activity {
     public void loginSuccess() {
         // To dismiss the dialog
         progress.dismiss();
+
         Toast.makeText(login_activity.this,"Login_Success",Toast.LENGTH_SHORT).show();
         startActivity(new Intent(login_activity.this,dashboard.class));
         finish();
@@ -91,9 +145,11 @@ public class login_activity extends Activity {
         progress.dismiss();
         Toast.makeText(login_activity.this,"failed",Toast.LENGTH_SHORT).show();
         username.setText("");
-        username.setError("Wrong Credentials");
+        //username.setError("Wrong Credentials");
         password.setText("");
         username.requestFocus();
+        logmsg.setText("Wrong Credentials");
+        logmsg.setVisibility(View.VISIBLE);
     }
 
     @Override

app/src/main/java/com/example/infiniteLoop/parkingo/userInfo.java

+package com.example.infiniteLoop.parkingo;
+
+import android.util.Log;
+
+public class userInfo {
+    public static userInfo u_instance=null;
+    private String username=null;
+    private String u_name=null;
+    public static userInfo getInstance() {
+        if(u_instance==null){
+            u_instance=new userInfo();
+
+        }
+        Log.d("ins","called");
+        return u_instance;
+    }
+
+    public String getName() {
+        return u_name;
+    }
+
+    public void setU_name(String u_name) {
+        this.u_name = u_name;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+}

app/src/main/java/com/example/infiniteLoop/parkingo/wallets.java

@@ -2,6 +2,7 @@ package com.example.infiniteLoop.parkingo;
 
 import android.app.Activity;
 import android.os.Bundle;
+import android.widget.TextView;
 
 public class wallets extends Activity {
 
@@ -9,5 +10,10 @@ public class wallets extends Activity {
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_wallets);
+        //TextView wdraw= findViewById(R.id.wdraw_txt);
+        //userInfo uinfo=userInfo.getInstance();
+
+        //wdraw.setText(uinfo.getName());
+
     }
 }

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

@@ -152,6 +152,7 @@
             app:cardElevation="15dp"
             >
             <TextView
+                android:id="@+id/wdraw_txt"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:layout_gravity="center_vertical"
@@ -168,6 +169,7 @@
 
             </TextView>
             <TextView
+
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:layout_gravity="right|center_vertical"

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

@@ -56,6 +56,16 @@
             android:fontFamily="sans-serif-condensed"
             />
 
-
+        <TextView
+            android:id="@+id/logmsg"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_margin="20dp"
+            android:background="@color/red"
+            android:textColor="#fff"
+            android:textSize="20dp"
+            android:text="asfdff"
+            android:visibility="invisible"></TextView>
     </LinearLayout>
 </LinearLayout>
+

app/src/main/res/values/colors.xml

@@ -4,4 +4,5 @@
     <color name="colorPrimaryDark">#303F9F</color>
     <color name="colorAccent">#FF4081</color>
     <color name="black">#000</color>
+    <color name="red">#f00</color>
 </resources>