android之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 jason.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 jason.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();  
    }  
}  

}