How to send an object one Android activity to another using Intents?

This example demonstrates how do I send an object from one android activity to another using intents.

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".MainActivity">
   <EditText
      android:id="@+id/editText"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_centerInParent="true"
      android:hint="Enter your Message" />
   <Button
      android:id="@+id/btnSendObj"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Send Obj to 2nd Activity"
      android:layout_centerInParent="true"
      android:layout_below="@id/editText"
      android:layout_marginTop="15dp"/>
</RelativeLayout>

Step 3 – Create an object from a java class (Message.java)

import java.io.Serializable;
public class Message implements Serializable {
   private static final long serialVersionUID = 1L;
   private String message;
   public String getMessage(){
      return message;
   }
   public void setMessage(String message){
      this.message = message;
   }
   @Override
   public String toString(){
      return "Message [message = " + message+"]";
   }
}

Step 4 − Add the following code to src/MainActivity.java

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
   public class MainActivity extends AppCompatActivity {
   EditText editText;
   Button button;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      editText = findViewById(R.id.editText);
      button = findViewById(R.id.btnSendObj);
      button.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            Intent intent = new Intent(MainActivity.this, SecondActivity.class);
            Message message = new Message();
            message.setMessage(editText.getText().toString());
            intent.putExtra("message", message);
            startActivity(intent);
         }
      });
   }
}

Step 5 – Create a new Activity and add the following code,

SecondActivity.java −

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
public class SecondActivity extends AppCompatActivity {
   TextView textView;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_second);
      textView = findViewById(R.id.textView);
      Intent intent = getIntent();
      Message message = (Message) intent.getSerializableExtra("message");
      textView.setText(message.toString());
   }
}

activity_second.xml −

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".SecondActivity">
   <TextView
      android:id="@+id/textView"
      android:textSize="16sp"
      android:textStyle="bold|italic"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerInParent="true"/>
</RelativeLayout>

Step 6 – Add the following code to androidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample">
   <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=".SecondActivity"></activity>
         <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>

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click Run  icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen –

Click here to download the project code. 

Azhar

Published on 04-Sep-2019 14:48:57