Android startActivityForResult的使用

在Android中startActivityForResult主要作用就是:

A-Activity需要在B-Activtiy中执行一些数据操作，而B-Activity又要将，执行操作数据的结果返回给A-Activtiy



//看效果



//看代码

[java] view
plaincopy

package sn.len.actres;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

public class ActivityResultDemoActivity extends Activity

{

private Button button_start_task;

private TextView TextView_result;

@Override

public void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

button_start_task=(Button) findViewById(R.id.button_start_task);

TextView_result=(TextView) findViewById(R.id.TextView_result);

button_start_task.setOnClickListener(new button_start_task_Listener());

}

private class button_start_task_Listener implements OnClickListener

{

public void onClick(View v)

{

Intent intent=new Intent(ActivityResultDemoActivity.this,SimpleTaskActivity.class);

//关键点来了，使用startActivityForResult来启动

startActivityForResult(intent, 100);

}

}

/**

* 复写onActivityResult，这个方法

* 是要等到SimpleTaskActivity点了提交过后才会执行的

*/

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data)

{

//可以根据多个请求代码来作相应的操作

if(20==resultCode)

{

String bookname=data.getExtras().getString("bookname");

String booksale=data.getExtras().getString("booksale");

TextView_result.setText("书籍名称:"+bookname+"书籍价钱"+booksale+"元");

}

super.onActivityResult(requestCode, resultCode, data);

}

}

//任务处理类

[java] view
plaincopy

package sn.len.actres;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

public class SimpleTaskActivity extends Activity

{

private EditText EditText_bookname;

private EditText EditText_booksale;

private Button Button_task_fulfill;

@Override

protected void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.main2);

EditText_bookname=(EditText) findViewById(R.id.EditText_bookname);

EditText_booksale=(EditText) findViewById(R.id.EditText_booksale);

Button_task_fulfill=(Button) findViewById(R.id.Button_task_fulfill);

Button_task_fulfill.setOnClickListener(new Button_task_fulfill_Listener());

}

private class Button_task_fulfill_Listener implements OnClickListener

{

public void onClick(View v)

{

String str_bookname=EditText_bookname.getText().toString();

String str_booksale=EditText_booksale.getText().toString();

//判断空，我就不判断了。。。。

Intent data=new Intent();

data.putExtra("bookname", str_bookname);

data.putExtra("booksale", str_booksale);

//请求代码可以自己设置，这里设置成20

setResult(20, data);

//关闭掉这个Activity

finish();

}

}

}