效果如下面的：

          

一共一个activity和两个xml。

******当我们须要使用的组件不在setContentView()设置的布局文件里，那我们就须要使用inflate（）方法来获取。使用view对象调用findViewByid（），作者一开直接调用findViewByid。走了好多弯路，于是写此博文来帮助各位博友，知道了就非常easy了。

*******

MainActivity.java

package com.example.head;import android.os.Bundle;import android.app.Activity;import android.app.AlertDialog;import android.content.Context;import android.content.DialogInterface;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.BaseAdapter;import android.widget.Gallery;import android.widget.ImageButton;import android.widget.ImageSwitcher;import android.widget.ImageView;import android.widget.ViewSwitcher.ViewFactory;public class MainActivity extends Activity implements ViewFactory{			ImageButton imageButton ;	Gallery gallery;	ImageSwitcher imageSwitcher;		int index;		private final static Integer[] IMAGES = {		R.drawable.z1,		R.drawable.z2,		R.drawable.z3			};	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_main);						imageButton = (ImageButton)findViewById(R.id.IB01);				imageButton.setBackgroundResource(R.drawable.z1);					}		public void click(View v){				LayoutInflater layoutInflater =LayoutInflater.from(MainActivity.this);		View view = layoutInflater.inflate(R.layout.headchoose, null);		AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);		imageSwitcher= (ImageSwitcher)view.findViewById(R.id.IS01);		 //组件不在activity_main。所以先要使用inflate获得headchoose布局		//并赋值给view对象。使用view对象，来调用findViewByid（）方法。假设不用view来		//调用findViewByid（）,找不到会报错。				gallery =  (Gallery)view.findViewById(R.id.Gall01);				imageSwitcher.setFactory(MainActivity.this);			gallery.setAdapter(new ImageAdapter(MainActivity.this));								gallery.setOnItemClickListener(new OnItemClickListener() {			@Override			public void onItemClick(AdapterView
      arg0, View arg1,					int position, long arg3) {				imageSwitcher.setImageResource(IMAGES[position]);				index = position;							}		});								builder.setTitle("图片选择")		.setView(view)		.setPositiveButton("确定", new DialogInterface.OnClickListener() {						public void onClick(DialogInterface dialog, int which) {				imageButton.setBackgroundResource(IMAGES[index]);							}			});				builder.show();							}	@Override	public View makeView() {		// TODO Auto-generated method stub		return new ImageView(this);	}		/*	 * ImageAdapter	 * 	 */		class ImageAdapter extends BaseAdapter{				Context context;				public ImageAdapter(Context context){			this.context = context;					}		@Override		public int getCount() {			// TODO Auto-generated method stub			return IMAGES.length;		}		@Override		public Object getItem(int position) {			// TODO Auto-generated method stub			return position;		}		@Override		public long getItemId(int position) {			// TODO Auto-generated method stub			return position;		}		@Override		public View getView(int position, View v, ViewGroup vg) {			ImageView imageView = new ImageView(context);			imageView.setImageResource(IMAGES[position]);			imageView.setLayoutParams(new Gallery.LayoutParams(120, 120));			imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);			return imageView;		}	}}

activity_main.xml

headchoose.xml

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