第三节--通过Intent实现Activity的数据传送及Meun的创建和使用

主Activity
/*
* 添加布局控件，添加监听并提交数据信息
* author：kevin
*/
public class Activity_Three extends Activity {
private EditText firstOne ;
private Button handler;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//根据控件的ID来取得代表控件的对象
firstOne = (EditText)findViewById(R.id.firstOne);
handler = (Button)findViewById(R.id.handler);

//将监听器的对象绑定到按钮对象上面
handler.setOnClickListener(new HandlerListener());
}
//当客户点击MENU按钮的时候，调用该方法
@Override
public boolean onCreateOptionsMenu(Menu menu) {
/*
* 	参数1.	groupId  The group identifier that this item should be part of.
*	参数2.	itemId  Unique item ID. Use NONE if you do not need a unique ID.
*	参数3.	order  The order for the item.
*	参数4.	title  The text to display for the item.
*/
menu.add(0, 1, 1, R.string.exit);
menu.add(0,2,2,R.string.about);
return super.onCreateOptionsMenu(menu);
}
//当客户点击菜单当中的某一个选项时，会调用该方法
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if(item.getItemId() == 1){
finish();
}
return super.onOptionsItemSelected(item);
}
class HandlerListener implements OnClickListener{

@Override
public void onClick(View v) {
//取得两个EditText控件的值
String firstMsg= firstOne.getText().toString();
//将值存放到Intent对象当中
Intent intent = new Intent();
intent.putExtra("one",firstMsg);
intent.setClass(Activity_Three.this, ResultActivity.class);
//启动ResultActivity
startActivity(intent);
}
}
}

接收数据Activity
/*
* 接收主Activity传过来的数据并显示
*/
public class ResultActivity extends Activity{
private TextView resultView;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.result);
resultView = (TextView)findViewById(R.id.result);
//得到Intent对象当中的值
Intent intent = getIntent();
String fetchMsg = intent.getStringExtra("one");
int OneIntValue = Integer.parseInt(fetchMsg);
//获取所得的值
int result = OneIntValue;
resultView.setText("获取所得的值:"+result);
}
}

布局文件：main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<EditText
android:id="@+id/firstOne"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/alert_info"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="点击下面按钮"
/>
<Button
android:id="@+id/handler"
android:text="确定提交"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>

布局文件result.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:id="@+id/result"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>