头像选择效果（ImageButton，Gallery，ImageSwitcher）

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >

<ImageButton
android:id="@+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

<EditText
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="text" >
<requestFocus />
</EditText>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<Gallery
android:id="@+id/gallery"
android:layout_width="fill_parent"
android:layout_height="110dp"
android:layout_alignParentLeft="true"
android:layout_marginTop="2dp" >
</Gallery>

<ImageSwitcher
android:id="@+id/switcher"
android:layout_width="90dp"
android:layout_height="90dp"
android:layout_below="@+id/gallery"
android:layout_centerHorizontal="true" >
</ImageSwitcher>

</RelativeLayout>

package cn.bzu.display;

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.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
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;
import android.support.v4.app.NavUtils;

public class DisplayActivity extends Activity {
private ImageButton imageButton;//图像按钮
private int[] images = { R.drawable.a, R.drawable.b, R.drawable.c,
R.drawable.d, R.drawable.e };//头像图片数组
private AlertDialog imageChooseDialog;//自定义对话框
private Gallery gallery;
private ImageSwitcher imageSwitcher;
private int imagePosition;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display);
imageButton = (ImageButton) this.findViewById(R.id.image);
imageButton.setBackgroundResource(R.drawable.ic_launcher);
imageButton.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
initImageChooseDialog();
imageChooseDialog.show();
}
});
}

private void initImageChooseDialog() {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(this);
alertDialog.setTitle("请选择你的头像");
alertDialog.setPositiveButton("确定",
new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
imageButton.setImageResource(images[imagePosition
% images.length]);
}
});
alertDialog.setNegativeButton("取消",
new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
LayoutInflater inflater = LayoutInflater.from(this);
// 通过布局文件生成view，并在后面通过.setView（）方法赋给alertDialog
View view = inflater.inflate(R.layout.imageswitch, null);
// 设置gallery
gallery = (Gallery) view.findViewById(R.id.gallery);
gallery.setAdapter(new ImageAdapter(this));// 设置适配器
gallery.setSelection(images.length / 2);// 设置默认图片
imageSwitcher = (ImageSwitcher) view.findViewById(R.id.switcher);
// 设置gallery选择事件，通过imageSwitcher来完成选择
gallery.setOnItemSelectedListener(new OnItemSelectedListener() {

@Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
imagePosition = position;// 将选定的位置保存起来，用于设定头像
imageSwitcher.setImageResource(images[position]);
}

@Override
public void onNothingSelected(AdapterView<?> arg0) {

}
});
imageSwitcher.setFactory(new MyViewFactory());// 为imageSwitcher设置自定义Factory
alertDialog.setView(view);
imageChooseDialog = alertDialog.create();

}

// 自定义MyViewFactory
private class MyViewFactory implements ViewFactory {
@Override
public View makeView() {
ImageView iv = new ImageView(DisplayActivity.this);
iv.setLayoutParams(new ImageSwitcher.LayoutParams(60, 60));// 设置图片选择的大小
return iv;
}
}

// 自定义ImageAdapter
private class ImageAdapter extends BaseAdapter {
private 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 images[position];
}

@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView iv = new ImageView(DisplayActivity.this);
iv.setImageResource(images[position]);
iv.setAdjustViewBounds(true);
iv.setLayoutParams(new Gallery.LayoutParams(80, 80));// 设置gallery显示的图片的大小
iv.setPadding(15, 10, 15, 10);
return iv;
}
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_display, menu);
return true;
}

}