Intent用法之 回传数据

A   startActivityForResult(intent,requestCode);


B   setResult(resultCode, Intent data);

A   重写onActivityResult(requestCode,resultCode,data);

/**
* 通过startActivityForResult() 开启的界面, 需要有返回值,
* 
* 则必须要通过 setResult() 方法返回数据
* 
* resultCode  返回码
* 
* data   intent意图对象
*/
Intent data = new Intent();
data.putExtra("imageId", imageId);

setResult(RESULT_OK, data);

//关闭当前Activity页面
finish();

package com.qf.day05_activity_04;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.ImageView;public class MainActivity extends Activity {private ImageView iv;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);iv = (ImageView) findViewById(R.id.iv);}public void show(View v) {Intent intent = new Intent(MainActivity.this, InfoActivity.class);// 带返回数据启动ActivitystartActivityForResult(intent, 110);}/** * 获取回传的数据 *  * int requestCode 请求码 int resultCode 结果码 Intent data 意图(带着返回参数) */@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {// TODO Auto-generated method stubsuper.onActivityResult(requestCode, resultCode, data);if (requestCode == 110 && resultCode == RESULT_OK) {// 为图片控件设置内容int imageId = data.getIntExtra("imageId", R.drawable.ic_launcher);iv.setImageResource(imageId);}}}

package com.qf.day05_activity_04;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.RadioGroup;public class InfoActivity extends Activity {private RadioGroup rg;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_info);rg = (RadioGroup) findViewById(R.id.rg);}//点击按钮后,将图片的ID 回传给MainActivity页面public void submit(View v){//1, 得到当前选中的RadionButton的idint checkId = rg.getCheckedRadioButtonId();//图片的IDint imageId = R.drawable.ic_launcher;switch (checkId) {case R.id.rb1:imageId = R.drawable.img_31;break;case R.id.rb2:imageId = R.drawable.img_32;break;case R.id.rb3:imageId = R.drawable.img_33;break;case R.id.rb4:imageId = R.drawable.img_42;break;case R.id.rb5:imageId = R.drawable.img_43;break;case R.id.rb6:imageId = R.drawable.img_44;break;}/** * 通过startActivityForResult() 开启的界面, 需要有返回值, *  * 则必须要通过 setResult() 方法返回数据 *  * resultCode  返回码 *  * data   intent意图对象 */Intent data = new Intent();data.putExtra("imageId", imageId);setResult(RESULT_OK, data);//关闭当前Activity页面finish();}}