Passing Data Between Activities

Start Another Activity

Intent intent = new Intent(MainActivity.this, SecondActivity.class);
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);

/** Called when the user clicks the Send button */
public void sendMessage(View view) {
    Intent intent = new Intent(this,SecondActivity.class);
    EditText editText = (EditText) findViewById(R.id.message);
    String message = editText.getText().toString();
    intent.putExtra(EXTRA_MESSAGE, message);
    startActivity(intent);
}

Receive Data

1. In the res/layout directory, edit the content_second.xml file.
2. Add an TextView element to the Layout.

   <TextView
       android:id="@+id/textView"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content" />
   

   Tip: android:textSize="20sp" for Change Text Size        android:textColor="@color/blue" for Change Text Color        android:textStyle="bold" for Change Text Style
3. In the java/akraj.snow.test directory, edit the SecondActivity.java file.
4. Get the intent and assign it to a local variable.

   Intent intent = getIntent();

5. Extract the message delivered by MainActivity with the getStringExtra() method.

   String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
   

   Tip: In Android Studio, press Alt + Enter (option + return on Mac) to import missing classes.

Passing Multiple Values

Intent i = new Intent(MainActivity.this, SecondActivity.class);
Bundle bundle = new Bundle();
bundle.putString("Name", "Akshay Raj");
bundle.putString("Email", "akshay@snowcorp.org");
i.putExtras(bundle);
startActivity(i);

Bundle bundle = getIntent().getExtras();
String name = bundle.getString("Name");
String email = bundle.getString("Email");
TextView textName = (TextView) findViewById(R.id.name);
TextView textEmail = (TextView) findViewById(R.id.email);
textName.setText(name);
textEmail.setText(email);

Complete Code

content_main.xml (res/layout)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="akraj.snow.test.MainActivity"
    tools:showIn="@layout/activity_main">
    <EditText android:id="@+id/edit_message"
        android:layout_weight="1"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:hint="@string/edit_message" />
    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button_send" />
</LinearLayout>

MainActivity.java (java/akraj.snow.test)

package akraj.snow.test;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends AppCompatActivity {
    public final static String EXTRA_MESSAGE = "akraj.snow.test.MESSAGE";
    EditText editText;
    Button button;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        editText = (EditText) findViewById(R.id.edit_message);
        button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this, SecondActivity.class);
                String message = editText.getText().toString();
                intent.putExtra(EXTRA_MESSAGE, message);
                startActivity(intent);
            }
        });
    }
}

content_second.xml (res/layout)

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="akraj.snow.test.SecondActivity"
    tools:showIn="@layout/activity_second">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20sp"
        android:id="@+id/textView" />
</RelativeLayout>

SecondActivity.java (java/akraj.snow.test)

package akraj.snow.test;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.widget.TextView;
public class SecondActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        Intent intent = getIntent();
        String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
        TextView textView = (TextView) findViewById(R.id.textView);
        textView.setText(message);
    }
}

Manifest File

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="akraj.snow.test">
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:theme="@style/AppTheme">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".SecondActivity"
            android:label="@string/title_activity_second"
            android:parentActivityName=".MainActivity"
            android:theme="@style/AppTheme">
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value="akraj.snow.test.MainActivity" />
        </activity>
    </application>
</manifest>