关于StartActivityForResult步骤的使用

关于StartActivityForResult方法的使用

根据方法名可知 这个方法是要得到启动后的Activity返回的数据；? 如A 启动了 B ； 那么就是得到B中返回的数据；

1：A

package org.zhou.test.start;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class StartActivityForResultActivity extends Activity implements OnClickListener {   private Button start;    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                start = (Button)findViewById(R.id.start);        start.setOnClickListener(this);    }public void onClick(View v) {if(v == start) {Intent intent = new Intent();intent.putExtra("key", "Say Hello");intent.setClass(StartActivityForResultActivity.this, NextActivity.class);startActivityForResult(intent,123211);}}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {// TODO Auto-generated method stubsuper.onActivityResult(requestCode, resultCode, data);//接收返回来的数据if(resultCode == 34901) {Log.i("Infos", "request:"+requestCode);Log.i("Infos", "value:"+data.getStringExtra("key"));}}}

?2:? B

package org.zhou.test.start;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;public class NextActivity extends Activity implements OnClickListener {private Button next;protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.next);next = (Button)findViewById(R.id.next);next.setOnClickListener(this);}@Overridepublic void onClick(View v) {if(next == v) {Intent intent = new Intent();intent.putExtra("key", "values This is good");intent.setClass(NextActivity.this, StartActivityForResultActivity.class);this.setResult(34901, intent);finish();}}}

?

这里的requestCode就是前面的123211?? 而resultCode就是34901?? 这样就可以达到接收唯一的指定的数据了