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);
		}
	}
	
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		// TODO Auto-generated method stub
		super.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);
	}

	@Override
	public 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