首先要创建2个activity 分别为MainActivity和OneActiivity

MainActivity代码如下:

package com.tp.soft.app;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView; public class MainActivity extends Activity implements OnClickListener{ private Button mTzBtn;
private TextView mShow;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main); mTzBtn = (Button) findViewById(R.id.tzBtn);
mTzBtn.setOnClickListener(this); mShow = (TextView) findViewById(R.id.showMsg); } @Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
} @Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode == ){
String msg = data.getStringExtra("FromOneActivity");
mShow.setText(msg);
}
} @Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, OneActivity.class);
String content = "Hello,OneActivity";
intent.putExtra("FromMainActivity", content);
startActivityForResult(intent, );
} }

其中调用

startActivityForResult(intent, 1);中的1就是
onActivityResult返回的requestCode。

OneActivity代码如下:
package com.tp.soft.app;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView; public class OneActivity extends Activity implements OnClickListener { private Button mbackBtn;
private TextView mShow;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_one); mbackBtn = (Button) findViewById(R.id.backBtn);
mbackBtn.setOnClickListener(this); mShow = (TextView) findViewById(R.id.showTxt);
Intent intent = getIntent();
String show = intent.getStringExtra("FromMainActivity");
mShow.setText(show);
} @Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.one, menu);
return true;
} @Override
public void onClick(View v) {
Intent intent = new Intent(OneActivity.this, MainActivity.class);
intent.putExtra("FromOneActivity", "Hello,MainActivity");
setResult(RESULT_OK, intent);
finish();
} }
05-06 22:27