activity 接回返回值

activity 接回返回值

今天做订单列表显示 点击某一项显示订单详细信息，在详细activity中用户可以选择取消订单（未支付的状态下）当用户取消订单后订单列表也要改变状态，原来最初做法是所加载绑定显示放在了

onStart方法中这样只要加载页面就重新绑定不这样可以解决上面问题，但问题是这样每次都要重新加载大家都知道 GPRS流量那叫一个宝贵啊。所以改变当前做法利用activity的onActivityResult方法

父activity方法如下

startActivityForResult(intent, 0);跳转activity时候用这个

@Override

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {    

        super.onActivityResult(requestCode, resultCode, data);

        if(resultCode==Activity.RESULT_OK)

        {

            String stateString = (String) data.getExtras().get("status");

            if(null!=stateString)

            {

                adapter.modifyOrderItem(position_x, "status", "dead");

            }

        }

    }

　子actiivty方法

btnBack.setOnClickListener(new OnClickListener() {         

            @Override

            public void onClick(View v) {

                // TODO Auto-generated method stub

                if(bolstatus)

                {

                    Intent intent = new Intent();

                    Bundle bundle = new Bundle();

                    bundle.putString("status", "dead");

                    intent.putExtras(bundle);

                    setResult(Activity.RESULT_OK, intent);

                }

                my_order_info.this.finish();

            }

        });

　　

bolstatus判断用户是否点击取消按钮

adapter方法

public void modifyOrderItem(int position,String key,String value)

    {

        listMaps.get(position).remove(key);

        listMaps.get(position).put(key,value);

        this.notifyDataSetChanged();

    }

　　成功解决这样做避免每次加载节省流量