Passing Data Using Intents

We have invoked one Activity from another passing an action. Now we will learn how to transfer data. We will make the simplest application. On the first screen we will enter our key1 and key2 and the second screen will display this data. We will transfer data inside Intent.

Using Intent we can transfer the in the form key and value pairs. Using this we can send String, Array, int, float all formats of data we can transfer.

Activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/webView1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"  >
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/bt1"
        android:text="Passing Data"/>
    </LinearLayout>

MainActivity.XML

package androiindians.first;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {
    Button button;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    button= (Button) findViewById(R.id.bt1);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(MainActivity.this,Second.class);
                intent.putExtra("Key1","Value1");
                intent.putExtra("Key2","Value2");
                startActivity(intent);
            }
        });
    }
}

activity_second.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="androiindians.first.Second">
</android.support.constraint.ConstraintLayout>

Second.Java

package androiindians.first;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;

public class Second extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
        Intent i=getIntent();
        String s1=i.getStringExtra("key1");
        String s2=i.getStringExtra("key1");
        Toast.makeText(getApplicationContext(),
                "Passed Values are"+s1+s2,Toast.LENGTH_LONG).show();
                    }
}