Using Intents to pass Data between Activities-Android Tutorial

In the previous post we learned to move  between activities through Intents.Now we are going to learn about passing data(String/int/char etc) from one activity to other using Intents. In this tutorial we are going to pass a string on clicking button in one activity(MainActivity.java)  and set it as 'text' in a TextView in the second activity

So let us begin..

STEP 1:

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:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

    
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="onclick"
        android:text="Next Activity"/>

</RelativeLayout>

MainActivity.java

Let us make a small change in our 'onclick method' to make it pass a string say "pass" to the second activity

public void onclick(View v)
    {
        Intent intent = new Intent(this, MainActivity2.class);
        inten.putExtra("text", "pass");
        this.startActivity(intent);

    }

So MainActivity.java look like this,

public class MainActivity extends ActionBarActivity {

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


       public void onclick(View v)
    {
        Intent intent = new Intent(this, MainActivity2.class);
        intent.putExtra("text", "pass");
        this.startActivity(intent);

    }

}

STEP 2:

Now go to our second activity's layout and add a text view with android:id="@+id/your_id"=>used to identify a particular component(Here it is TextView).Actually it gives an identity to the textview

activity_main_activity2.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:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="cooltechiz.blogspot.com.helloworld.MainActivity2">

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

</RelativeLayout>

STEP 3:

Add this to OnCreate  of second Activity

String textview_text = getIntent().getExtras().getString("text"); 

 TextView tv1 = (TextView) this.findViewById(R.id.your_id);

 tv1.setText(textview_text);

MainActivity2.java

public class MainActivity2 extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_activity2);
        String textview_text = getIntent().getExtras().getString("text");
        //get the text from intent
        TextView tv1 = (TextView) this.findViewById(R.id.your_id);
        tv1.setText(textview_text);
    } 
}


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_activity2);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main_activity2, 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();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

Now we finished coding.Click on 'RUN' button and Launch the application.Then click on Button in MainActivity.It will launch the second activity with a TextView with a text "pass" on it.So we passed the string from one activity to other.You are awesome!