Android(安卓)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 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;@Overridepublic 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 */@Overrideprotected 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 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;@Overrideprotected 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20setResult(20, data);//关闭掉这个Activityfinish();}}}

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