android使用include调用内部组件的方法

本文实例讲述了android使用include调用内部组件的方法。分享给大家供大家参考。具体如下：

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。
 
这样的话。。。可以解决了include 多次同一个layout的问题

希望本文所述对大家的Android程序设计有所帮助。