Intents Basic Example Between screens

MainActivity.java


package bhanu.firstapp;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;


public class MainActivity extends ActionBarActivity {

Button b1,b2,st;
EditText et1,et2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        b1=(Button)findViewById(R.id.button1);
        b2=(Button)findViewById(R.id.button2);
        st=(Button)findViewById(R.id.button3);
        et1=(EditText)findViewById(R.id.editText1);
     
        b1.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
String str1=et1.getText().toString();
Intent in=new Intent(MainActivity.this,Second.class);
in.putExtra("data", str1);
startActivity(in);
Toast.makeText(getApplicationContext(), "you Clicked on submit", 100).show();

}
});
     
        b2.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "You clicked on cancel", 1000).show();
}
});
        st.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent in1=new Intent(MainActivity.this,Two.class);
startActivity(in1);
}
});
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

Second.java

package bhanu.firstapp;

import android.app.Activity;

import android.graphics.Color;

import android.os.Bundle;

import android.support.annotation.ColorRes;

import android.widget.TextView;

import android.widget.Toast;

public class Second extends Activity

{

//TextView t1;

protected void onCreate(Bundle savedInstanceState) {

       super.onCreate(savedInstanceState);

       String str= getIntent().getExtras().getString("data");

       Toast.makeText(getApplicationContext(), str, 500).show();

       TextView t1=new TextView(getApplicationContext());

       t1.setTextColor(Color.YELLOW);

       t1.setText("welcome"+ " " +str);

       setContentView(t1);

       

}

}

activity_main.xml

<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"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="bhanu.firstapp.MainActivity" >

    <TextView

        android:id="@+id/textView1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_alignParentTop="true"

        android:layout_marginTop="28dp"

        android:text="@string/usn" />

    <EditText

        android:id="@+id/editText2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/editText1"

        android:layout_below="@+id/editText1"

        android:layout_marginTop="19dp"

        android:ems="10"

        android:inputType="textPassword" />

    <TextView

        android:id="@+id/textView2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignBaseline="@+id/editText2"

        android:layout_alignBottom="@+id/editText2"

        android:layout_alignLeft="@+id/textView1"

        android:text="@string/pwd" />

    <Button

        android:id="@+id/button2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignBottom="@+id/button1"

        android:layout_alignRight="@+id/editText1"

        android:text="@string/can" />

    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/textView2"

        android:layout_below="@+id/textView2"

        android:text="@string/sub" />

    <EditText

        android:id="@+id/editText1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignBaseline="@+id/textView1"

        android:layout_alignBottom="@+id/textView1"

        android:layout_toRightOf="@+id/textView1"

        android:ems="10" />

    <Button

        android:id="@+id/button3"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/button1"

        android:layout_marginTop="46dp"

        android:layout_toRightOf="@+id/textView2"

        android:text="@string/st" />

</RelativeLayout>

two.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

    <TextView

        android:id="@+id/textView1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Welcome"

        android:textAppearance="?android:attr/textAppearanceLarge" />

</LinearLayout>