One Activity Intent Android App Source Code

FirstActivity.java

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package com.sam.web.oneactivityintent;

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.ImageView;

import android.widget.TextView;

public class FirstActivity extends AppCompatActivity {

    private Button button;

    private TextView textView;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        button=(Button) findViewById(R.id.buttonId);

        textView=(TextView) findViewById(R.id.textViewId);

        button.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                Intent intent=new Intent(FirstActivity.this,SecondActivity.class);

                startActivityForResult(intent,1);

            }

        });

    }

    @Override

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        super.onActivityResult(requestCode, resultCode, data);

        if(requestCode==1){

            String value=data.getStringExtra("key");

            textView.setText(value);

        }

    }

}

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Activity_main.xml

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<?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"

    android:orientation="vertical"

    android:gravity="center"

    tools:context="com.sam.web.oneactivityintent.FirstActivity">

    <Button

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:id="@+id/buttonId"

        android:text="@string/button1_text"

        android:textSize="20sp"

        android:textStyle="bold"

        style="@style/Widget.AppCompat.Button.Colored"

        android:layout_marginBottom="20dp"

        />

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:id="@+id/textViewId"

        android:textSize="20sp"

        android:textStyle="bold"

        />

</LinearLayout>

============================================================

string.xml

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<resources>

    <string name="app_name">OneActivityIntent</string>

    <string name="button1_text">Go to the Second Activity</string>

    <string name="button2_text">Go to the first Activity</string>

</resources>

============================================================================

SecondActivity.java

---------------------

package com.sam.web.oneactivityintent;

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 SecondActivity extends AppCompatActivity {

    private Button button;

    private EditText editText;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_second);

        button=(Button) findViewById(R.id.button2Id);

        editText=(EditText) findViewById(R.id.editTextId);

        button.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                String value=editText.getText().toString();

                Intent intent=new Intent(SecondActivity.this,FirstActivity.class);

                intent.putExtra("key",value);

                setResult(1,intent);

                finish();

            }

        });

    }

}

================================================================================

Activity_Second.xml

--------------------

<?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"

    android:orientation="vertical"

    android:gravity="center"

    tools:context="com.sam.web.oneactivityintent.SecondActivity">

    <EditText

        android:layout_width="250dp"

        android:layout_height="wrap_content"

        android:id="@+id/editTextId"

        android:textSize="20sp"

        android:layout_marginBottom="20dp"

        android:text="Enter your name"

        />

    <Button

        android:id="@+id/button2Id"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:textSize="20sp"

        android:text="@string/button2_text"

        style="@style/Widget.AppCompat.Button.Colored"

        />

</LinearLayout>