StartActivityForResult

If want to get the data from the son activity, we can use the startactivityForResult.

So For getting the data from the son activity, we just need to override the methods " onActivityResult" 。

Let‘s code for this.

At first, we should create a mather activity.

package com.novasoftware;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MatherActivity extends Activity {

    private static String TAG="Mather Activity";
    
    private Button btnOpen;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         LocalizeContols();
         RegisterEvents();     
    }
    
    private void LocalizeContols()
    {
        btnOpen=(Button)this.findViewById(R.id.btn_add_qrcode);
    }
    
    private void RegisterEvents()
    {
        //Add the click listener for the button view.
        btnOpen.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MatherActivity.this,SonActivity.class);
                startActivityForResult(intent,1);
            }
        });
    }
    
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        String result = data.getExtras().getString("result");
        Log.i(TAG, result);
    }
    
}

when the onActivityResult methods, we can get the result with getextras. So we should add the data for the extras before we close the son activity.

package com.novasoftware;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class SonActivity extends Activity {

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

        Button btnClose = (Button) findViewById(R.id.btn_cancel_scan);
        btnClose.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.putExtra("result", "This is the son activity sends!");
                SonActivity.this.setResult(RESULT_OK, intent);
                SonActivity.this.finish();
            }
        });

    }

}

after we close the son activity, we will find there is a log in the LogCat: Mather Activity --- This is the son activity sends!.