Part 10 - Passing Data Between Activities - Method One

 Java Part One : 

package first.learn.passingdatabetweenactivities;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

    EditText etName;
    Button btnSimpleString;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        etName = (EditText) findViewById(R.id.etName);

        btnSimpleString = (Button) findViewById(R.id.btnSimpleString);

        btnSimpleString.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                String s = etName.getText().toString();

                if(TextUtils.isEmpty(s)){
                    etName.setError("Empty");
                    return;
                }

                etName.setError(null);


                Intent intent = new Intent(MainActivity.this, DataGettingActivity.class );

                intent.putExtra("StringPacket", s );

                startActivity(intent);

            }
        });

    }
}

xml part One : 

<?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"
    tools:context=".MainActivity"
    android:orientation="vertical"
    android:layout_margin="16dp">

   <EditText
       android:hint="write...."
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:id="@+id/etName"/>

    <Button
        android:id="@+id/btnSimpleString"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Simple String"/>

</LinearLayout>

Java Part Two : 

package first.learn.passingdatabetweenactivities;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.TextView;

public class DataGettingActivity extends AppCompatActivity {

    TextView tvData;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_data_getting);

        setTitle("Data Getting Activity");

        tvData = (TextView) findViewById(R.id.tvData);


        if(getIntent()!=null){

            if(getIntent().getStringExtra("StringPacket")!=null){

                String gettingString = getIntent().getStringExtra("StringPacket");

                tvData.setText(gettingString);

            }
        }


    }
}

Xml Part Two : 

<?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"
    tools:context=".DataGettingActivity"
    android:layout_margin="16dp">


    <TextView
        android:id="@+id/tvData"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="30dp"
        android:text="Text"
        android:gravity="center"
        android:layout_marginTop="25dp"/>


</LinearLayout>