startActivityForResult use

MainActivity.java文件


package com.iisant.editextdemo;


import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioGroup;


public class MainActivity extends Activity {


private Button idb = null;
private EditText idText;
private RadioGroup Rg1;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
setContentView(R.layout.activity_main);
idb = (Button) findViewById(R.id.idb);
idText = (EditText) findViewById (R.id.idText);
Rg1 = (RadioGroup) findViewById(R.id.Rg1);
idb.setOnClickListener(listener);


// intent intentg = getIntent ();
// int radioBId=intentg.getIntExtra("radioButtonId", 0);
// Rg1.setId (radioBId);


}


private OnClickListener listener = new OnClickListener() {


@Override
public void onClick(View v) {


String content = idText.getText().toString();
Intent intent = new Intent();
Bundle bundle = new Bundle();
intent.setClass (MainActivity.this, SecondActivity.class); // MainActivity.this current, SecondActivity.class to jump
bundle.putString("content", content);
intent.putExtras(bundle);
startActivityForResult (intent, 0); // Start
}
};


@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {

switch (resultCode) {// resultCode is the mark of return, what I return in B is RESULT_OK
case 10:

String content2 = data.getStringExtra("content2");
idText.setText(content2);
break;
default:
break;
}
}


}






SecondActivity文件


package com.iisant.editextdemo;


import java.security.acl.Group;


import android.app.Activity;
import android.content.Intent;
import android.net.sip.SipAudioCall.Listener;
import android.os.Bundle;
import android.os.PersistableBundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;


public class SecondActivity extends Activity {


private EditText idText1;
private RadioGroup radiogroup;
// private RadioButton rbyw;
// private RadioButton rbsx;
// private RadioButton rbyy;
private Button Idb = null;
// private static MainActivity mActiviy;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
setContentView(R.layout.activity1);


// Load control
idText1 = (EditText) this.findViewById (R.id.idText1);
radiogroup = (RadioGroup) this.findViewById(R.id.Rg);
Idb = (Button) this.findViewById(R.id.idb1);
// rbyw = (RadioButton) this.findViewById (R.id.Rbyw);
// rbsx=(RadioButton)this.findViewById(R.id.Rbsx);
// rbyy=(RadioButton)this.findViewById(R.id.Rbyy);
// radiogroup.setOnClickListener(listener);


Idb.setOnClickListener(listener);
// radiogroup.setOnClickListener(listen);

// set monitor
radiogroup
.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {


@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub

// Get the ID of the selected item
int radioButtonId = group.getCheckedRadioButtonId();
// Acquire an instance of RadioButton based on ID
RadioButton rb = (RadioButton) SecondActivity.this
.findViewById(radioButtonId);
// Update the text content to match the selected item
idText1.setText ("The course you choose to study is:" + rb.getText ());

// Intent intentg=new Intent();
// Bundle bundleg=new Bundle();
// intentg.setClass(SecondActivity.this, MainActivity.class);
// bundleg.putInt("radioButtonId", radioButtonId);
// intentg.putExtras(bundleg);
// startActivity(intentg);
}
});


Intent intent = getIntent();
String content = intent.getStringExtra("content");
idText1.setText(content);


}


private OnClickListener listener = new OnClickListener() {


@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String content2 = idText1.getText().toString();
Intent intent2 = new Intent();
Bundle bundle2 = new Bundle();
intent2.setClass(SecondActivity.this, MainActivity.class);
bundle2.putString("content2", content2);
intent2.putExtras(bundle2);
// startActivity(intent2);
setResult (10, intent2);
finish();

// KeyEvent newEvent = new KeyEvent(KeyEvent.ACTION_DOWN,  
//                    KeyEvent.KEYCODE_BACK);  
//            mActivity.onKeyDown(KeyEvent.KEYCODE_BACK, newEvent);
}
};

}