HLessJon Tutorials

package com.mycompany.aboutbundle;

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

public class MainActivity extends Activity implements View.OnClickListener {
    private final int SECONDARY_ACTIVITY_REQUEST_CODE = 0;
    private EditText mEditText1;
    private EditText mEditText2;
    private Button mButton1;

    //DONT FORGET: to add SecondaryActivity to the manifest file!!!!!

    /**
     * Called when the activity is first created.
     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mEditText1 = (EditText) findViewById(R.id.editText1);
        mEditText2 = (EditText) findViewById(R.id.editText1b);
        mButton1 = (Button) findViewById(R.id.button1);
        mButton1.setOnClickListener(this);

    }

    public void onClick(View view) {
        if (view == mButton1) {
            //create a new intent and specify that the target is SecondaryActivity...
            Intent intent = new Intent(getApplicationContext(), SecondaryActivity.class);
            //load the intent with a key "myKey" and assign a value
            //to be whatever has been entered into the textview
            //Notice this only sends mEditText1  to SecondaryActivity.java inside intent using putExtra
            //which is why the data sent from SecondaryActivity is seen in MainActivity but you are not
            //sending info in mEditText2 back to SecondaryActivity and thus
            // SecondaryActivity will always load txtSecondary2 empty
            intent.putExtra("myKey", mEditText1.getText().toString());
            //launch the secondary activity and send the intent along with it
            //note that a request code is passed in as well so that when the
            //secondary activity returns control to this activity,
            //we can identify the source of the request...
            startActivityForResult(intent, SECONDARY_ACTIVITY_REQUEST_CODE);
        }
    }

    //we need a handler for when the secondary activity finishes it's work
    //and returns control to this onActivity, also preserves initial data entry.
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
        super.onActivityResult(requestCode, resultCode, intent);
        Bundle extras = intent.getExtras();
        // get your data out of the bundle using the get methods:
        //could also use
        //mEditText2.setText(extras != null ? extras.getString("returnKey"): "nothing returned");
        //Check if bundle contains key or not then handle that event

                if(extras.containsKey("returnKey")){
                    mEditText2.setText(extras.getString("returnKey"));
        }else{
                    mEditText2.setText("Nothing Returned");
        }
    }
}