Android onActivityResult

1）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

2）接下来我将附加代码讲述

1.添加AddActivity和EditActivity

2.将主窗体MainActivity修改成代码如下

主要实现的功能是跳转到子Activity(AddActivity,EditActivity)并根据请求代码和结果代码获取子窗体的参数。

package com.example.androiddemo2;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.util.Log;import android.view.Menu;import android.view.View;import android.widget.Button;public class MainActivity extends Activity {private Button addButton=null;private Button editButton=null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);/*跳转到AddActivity*/addButton=(Button)findViewById(R.id.addButton);addButton.setOnClickListener(new Button.OnClickListener() {@Overridepublic void onClick(View arg0) {Intent addIntent=new Intent(MainActivity.this, AddActivity.class);/*addRequest是一个“请求代码”应该大于等于0它将会在onActivityResult()中返回*/startActivityForResult(addIntent, BaseField.AddRequest);}});/*跳转到EditActivity*/editButton=(Button)findViewById(R.id.editButton);editButton.setOnClickListener(new Button.OnClickListener() {@Overridepublic void onClick(View arg0) {Intent editIntent=new Intent(MainActivity.this,EditActivity.class);Bundle bundle=new Bundle();bundle.putString("username", "张三");bundle.putString("password", "123456");editIntent.putExtras(bundle);/*editRequest是一个“请求代码”应该大于等于0它将会在onActivityResult()中返回*/startActivityForResult(editIntent, BaseField.EditRequest);}});} /**      * 重写onActivityResult这个方法      * 是要等到AddActivity,EditActivity finish后才会执行的      */      @Override      protected void onActivityResult(int requestCode, int resultCode, Intent data)      {    /*添加请求代码和添加结果代码*/    if(requestCode==BaseField.AddRequest&&resultCode==BaseField.AddResult){    Bundle bundle=data.getExtras();    Log.i(BaseField.Tag, bundle.getString("message"));    }    /*修改请求代码和修改结果代码*/    if(requestCode==BaseField.EditRequest&&resultCode==BaseField.EditResult){    Bundle bundle=data.getExtras();    Log.i(BaseField.Tag, bundle.getString("message"));    }    super.onActivityResult(requestCode, resultCode, data);    }@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}

3.修改AddActivity代码如下

实现的功能是设置回传参数和结果代码并关闭Activity促使MainActivity调用onActivityResult方法

package com.example.androiddemo2;import android.app.Activity;import android.content.Intent;import android.os.Bundle;public class AddActivity extends Activity {@Overridepublic void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    /*设置回传参数和结果代码后finish Activity*/    Intent intent=new Intent();    intent.putExtra("message", "add success");    setResult(BaseField.AddResult, intent);    finish();}}

4.修改EditActivity代码如下

实现功能是获取MainActivity传过来的参数，然后设置回传参数和结果代码并关闭Activity促使MainActivity调用onActivityResult方法

package com.example.androiddemo2;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.util.Log;public class EditActivity extends Activity {@Overridepublic void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    /*获取传递的参数*/    Bundle bundle=this.getIntent().getExtras();      Log.i(BaseField.Tag, bundle.getString("username"));    Log.i(BaseField.Tag, bundle.getString("password"));    /*设置回传参数和结果代码后finish Activity*/    Intent intent=new Intent();    intent.putExtra("message", "edit success");    setResult(BaseField.EditResult, intent);    finish();}}

5.添加一个类BaseField.java用来存放“添加请求代码”、”添加结果代码“...

具体代码如下

package com.example.androiddemo2;public class BaseField {/*添加请求代码*/public static int AddRequest=101;/*修改请求代码*/public static int EditRequest=201;/*添加结果代码*/public static int AddResult=102;/*修改结果代码*/public static int EditResult=202;public static String Tag="TAG"; }

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