Activity之间数据交流(onActivityResult的用法)

http://www.blogjava.net/mixer-a/archive/2012/03/23/375014.html

http://www.cnblogs.com/linjiqin/archive/2011/06/03/2071956.html

主要功能:
在一个主界面(主Activity)上能连接往许多不同子功能模块(子Activity上去),当子模块的事情做完之后就回到主界面(或许还同时返回一些子模块完成的数据交给主Activity处理)。执行onActivityResult,这样的数据交流就要用到回调函数onActivityResult。
主Activity:

<1>startActivityForResult(Intent intent, int requestCode);
第一个参数:一个Intent对象
第二个参数:如果> = 0,当Activity结束时requestCode将归还在onActivityResult()中。以便确定返回的数据是从哪个Activity中返回

<2>onActivityResult(int requestCode, int resultCode, Intent data)
第一个参数:这个整数requestCode提供给onActivityResult,是以便确认返回的数据是从哪个Activity返回的。
这个requestCode和startActivityForResult中的requestCode相对应。
第二个参数:这整数resultCode是由子Activity通过其setResult()方法返回。
第三个参数:一个Intent对象,带有返回的数据。

子Activity:

<3>setResult(int resultCode, Intent data)
调用这个方法把Activity想要返回的数据返回到父Activity
第一个参数:当Activity结束时resultCode将归还在onActivityResult()中,一般为RESULT_CANCELED , RESULT_OK。
第二个参数:一个Intent对象,返回给父Activity的数据。

Activity之间数据交流(onActivityResult的用法) Activity之间数据交流(onActivityResult的用法) Activity之间数据交流(onActivityResult的用法)

Activity之间数据交流(onActivityResult的用法) Activity之间数据交流(onActivityResult的用法)

本实例一共有三个Activity。
点击飞往火星跳转到otherActivity,把地球带给火星的消息显示在otherActivity中。点击返回地球时把火星带给地球的消息传到主Activity.
同理:
点击飞往月球跳转到thirdActivity,把地球带给月球的消息显示在thirdActivity中。点击返回地球时把月球带给地球的消息传到主Activity.

具体实现:
主Activity:

package xiaosi.onActivityResult;

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;
import android.widget.TextView; public class OnActivityResultActivity extends Activity
{
private Button button = null;
private Button button1 = null;
private TextView text = null;
private static final int Mars = 0;
private static final int Moon = 1; @Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
text = (TextView) findViewById(R.id.text);
button = (Button) findViewById(R.id.button);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v)
{
Intent intent = new Intent(OnActivityResultActivity.this, otherActivity.class);
String content = "地球来的消息:你好,我是来自地球上的小老鼠。我好想去你们的火星呀";
intent.putExtra("FromEarth", content);
startActivityForResult(intent, Mars);
}
});
button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v)
{
Intent intent = new Intent(OnActivityResultActivity.this, thirdActivity.class);
String content = "地球来的消息:你好,我是来自地球上的小老鼠。我好想去你们月球";
intent.putExtra("FromEarth", content);
startActivityForResult(intent, Moon);
}
});
} @Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
switch (requestCode)
{
case Mars:
Bundle MarsBuddle = data.getExtras();
String MarsMessage = MarsBuddle.getString("FromMars");
text.setText(MarsMessage);
break;
case Moon:
Bundle MoonBuddle = data.getExtras();
String MoonMessage = MoonBuddle.getString("FromMoon");
text.setText(MoonMessage);
break;
}
}
}

otherActivity:

package xiaosi.onActivityResult;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView; public class otherActivity extends Activity
{
private Button button = null; @Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.other);
Intent EarthIntent = getIntent();
String EarthMessage = EarthIntent.getStringExtra("FromEarth");
button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
Intent intent = new Intent(otherActivity.this, OnActivityResultActivity.class);
String passString = "火星来的消息:Hello,我是火星的Jack,非常高兴你能来火星";
intent.putExtra("FromMars", passString);
setResult(RESULT_OK, intent);
finish();
}
});
TextView textView = (TextView) findViewById(R.id.othertext);
textView.setText(EarthMessage);
}
}

thirdActivity:

package xiaosi.onActivityResult;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView; public class thirdActivity extends Activity
{
private Button button = null; @Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.third);
Intent EarthIntent = getIntent();
String EarthMessage = EarthIntent.getStringExtra("FromEarth");
button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
Intent intent = new Intent(thirdActivity.this, OnActivityResultActivity.class);
String passString = "月球来的消息:Hello,我是月球的Lucy,非常欢迎你来月球";
intent.putExtra("FromMoon", passString);
setResult(RESULT_OK, intent);
finish();
}
});
TextView textView = (TextView) findViewById(R.id.thirdtext);
textView.setText(EarthMessage);
}
}
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