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

 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

 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();
         }
     }
 }