android之startActivityForResult的使用

大家好，又见面了，我是全栈君。

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]

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]

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();
}
}
}

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