Android: Using onActivityResult(), startActivityForResult() and setResult()

It is very common, when starting a new activity, to want to receive the data from that other activity at the end of the activity and then execute an action.

Let’s look at an example:

Let’s suppose I have a ListProducts activity and AddEditProduct. Within the ListProducts activity I click on the button to add a new product, and I want to receive the result of this product addition in my ListProducts activity. Well, that’s why we use the onActivityResult() overridden method in the activity we want to receive the result from. Below is the example code to illustrate how to use these methods.

public class MainActivity extends Activity {  
    TextView textView1;  
    Button button1;  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
        textView1=(TextView)findViewById(R.id.textView1);  
        button1=(Button)findViewById(R.id.button1);  
        button1.setOnClickListener(new OnClickListener() {  
            @Override  
            public void onClick(View arg0) {  
                Intent intent=new Intent(MainActivity.this,SecondActivity.class);  
                startActivityForResult(intent, 1);// Activity é iniciada com requestCode 1  
            }  
        });  
    }  
 // Recebe os dados da outra Activity  
    @Override  
       protected void onActivityResult(int requestCode, int resultCode, Intent data)  
       {  
                 super.onActivityResult(requestCode, resultCode, data);  
                  // Verfica se o requestCode é o mesmo que foi passado  
                   if(requestCode==1 && resultCode == RESULT_OK)  
                         {  
                            String message=data.getStringExtra("MESSAGE");   
                            textView1.setText(message);  
                         }  
     }  
}

<RelativeLayout xmlns:androclass="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=".MainActivity" >  
    <TextView  
        android:id="@+id/textView1"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_alignLeft="@+id/button1"  
        android:layout_alignParentTop="true"  
        android:layout_marginTop="48dp"  
        android:text="Default Message" />  
    <Button  
        android:id="@+id/button1"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_below="@+id/textView1"  
        android:layout_centerHorizontal="true"  
        android:layout_marginTop="42dp"  
        android:text="GetMessage" />  
</RelativeLayout>

public class OutraActivity extends Activity {  
    EditText editText1;  
    Button button1;  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_outra);  
        editText1=(EditText)findViewById(R.id.editText1);  
            button1=(Button)findViewById(R.id.button1);  
            button1.setOnClickListener(new OnClickListener() {  
                @Override  
                public void onClick(View arg0) {  
                    String message=editText1.getText().toString();  
                    Intent intent=new Intent();  
                    intent.putExtra("MESSAGE",message);  
                    setResult(RESULT_OK,intent);
                    //encerra activity  
                    finish();
                }  
            });  
    }  

}

<RelativeLayout xmlns:androclass="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=".OutraActivity" >  
    <EditText  
        android:id="@+id/editText1"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_alignParentTop="true"  
        android:layout_marginTop="61dp"  
        android:layout_toRightOf="@+id/textView1"  
        android:ems="10" />  
    <TextView  
        android:id="@+id/textView1"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_alignBaseline="@+id/editText1"  
        android:layout_alignBottom="@+id/editText1"  
        android:layout_alignParentLeft="true"  
        android:text="Enter Message:" />  
    <Button  
        android:id="@+id/button1"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_below="@+id/editText1"  
        android:layout_centerHorizontal="true"  
        android:layout_marginTop="34dp"  
        android:text="Submit" />  
</RelativeLayout>