android加载include

例子一：
sublayout.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="wrap_content"
    android:background="#505050"
    >
<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="SubLayout"
    />
<Button
android:id="@+id/mybutton"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text=" A Button "
    />
</LinearLayout>

mail.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:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello"
    />
<include android:id="@+id/main1" layout="@layout/sublayout" />
<include android:id="@+id/main2" layout="@layout/sublayout" />
<Button
    android:id="@+id/startanotheractivity"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text=" Start Another Activity "
    />
</LinearLayout>

如何调用组件include进来的组件呢。

package com.AndroidIncludeLayout;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class AndroidIncludeLayout extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        View subLayout1 = (View)findViewById(R.id.main1);
        View subLayout2 = (View)findViewById(R.id.main2);
        Button myButton_main1 = (Button)subLayout1.findViewById(R.id.mybutton);
        Button myButton_main2 = (Button)subLayout2.findViewById(R.id.mybutton);
        Button startAnotherActivity = (Button)findViewById(R.id.startanotheractivity);

        startAnotherActivity.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    Intent intent = new Intent();
             intent.setClass(AndroidIncludeLayout.this, AnotherActivity.class);
             startActivity(intent);

   }});

        myButton_main1.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    Toast.makeText(AndroidIncludeLayout.this, "Button 1 Pressed", Toast.LENGTH_LONG).show();
   }});

        myButton_main2.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    Toast.makeText(AndroidIncludeLayout.this, "Button 2 Pressed", Toast.LENGTH_LONG).show();
   }});
    }
}
但是如果include进来的xml，是
sublayout.xml

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android">
<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="SubLayout"
    />
<Button
android:id="@+id/mybutton"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text=" A Button "
    />
</merge>

则以上的方法将不能实现，会报空指针。
因为用了merge后，导入进来就相当于是当前view下的组件了，所以直接

findViewById就可以了。

01.<?xml version="1.0" encoding="utf-8"?>

02.<RelativeLayout android:layout_width="fill_parent" android:layout_height="fill_parent" style="@style/StyleLayoutMain" mce_style="@style/StyleLayoutMain"

03. xmlns:android="http://schemas.android.com/apk/res/android">

04.

05.

06. <!-- include标签内设置id属性后(android:id)，其引用的布局layout内的id属性就不起作用了，怀疑是其引用的layout外层包裹了一层include标签

07. 或者是覆盖了其内的属性id-->

08. <!-- 如果没有include标签，所有布局代码都写在一个xml文件中，界面会显得很冗余，可读性很差。而且界面加载的时候是按照顺序加载的，前面的布局不能

09. 调用其后面的布局id。而采用include后，一个include中可以引用其后的include中的布局id属性 -->

10. <include android:id="@id/titleLayout" layout="@layout/app_title" />

11.

12. <include layout="@layout/app_tradelogin"/>

13.

14. <include layout="@layout/app_bottom"/>

15.

16.</RelativeLayout>

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