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How to Use getExtra and putExtra in Android for String Data

Use getExtra and putExtra

You want to get some information like name, surname, email when user login on Android, and show on second activity these information , we can use getExtra and putExtra . There are a lot of method for getting information from first to second activity, I try to explain getting with getExtra and putExtra on getting user name and surname to show second activity, let ’s start,

  • Firstly I created two label(TextView) for definition to name and surname and EditText for enter name and surname to users on activity_main.xml,

  • Then we created new class under src folder and under the package name SecondActivity.java, and under the /res/layout/ folder created secondactivity.xml .

  • For definite and connect between main and second activity open AndroidManifest.xml and create new activity for second .

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<activity
    android:name=".SecondActivity"
    android:label="Second Activity"
    >
    <intent-filter >
        <action android:name="com.example.package_path.SecondActivity"/>
        <category android:name="android.intent.category.DEFAULT" />
    </intent-filter>
</activity>
  • After that we need to create button on activtiy_main.xml after click this button goes the second activity .
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<Button
     android:id="@+id/button1"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:layout_alignTop="@+id/textView1"
     android:layout_centerHorizontal="true"
     android:layout_marginTop="50dp"
     android:onClick="onClick"
     android:text="Sign in" />

On MainActivity.java

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public void onClick(View view){
    startActivity(new Intent("com.example.package_path.SecondActivity"));
}

Now when you click on Sign in button, you should go to second activity,

  • After you need to add TextView to secondactivity.xml
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<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="10dp"
    android:textColor="#0000ff"
    android:textSize="25dp"
    android:text="Welcome !" />

Now we can getting to username and surname from EditTexts and show instead of TextView on Second Activity.

Firstly open MainActivity.java and write below

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public class MainActivity extends ActionBarActivity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
  }
  public void onClick(View view){         
      EditText etName1 = (EditText) findViewById(R.id.editText1);
      EditText etName2 = (EditText) findViewById(R.id.editText2);
      Intent intent = new Intent(MainActivity.this, SecondActivity.class);
      intent.putExtra("name", etName1.getText()+" "+etName2.getText());
      startActivity(intent);      
  }

After write above on SecondActivity

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public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.secondactivity);      
      TextView txtView = (TextView) findViewById(R.id.textView1);
      Intent intent = getIntent();
      Bundle bd = intent.getExtras();       
      if(bd != null)
      {
          String getName = (String) bd.get("name");
          txtView.setText(getName);            
      }
  }

That ’s it . Now you should enter your username and surname to editText after you can see your name and surname on Second Activity.

I hope helped to you.

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