新建项目
② 定义layout外部resource的xml文件,用来改变layout的背景
-
-
<?xml version="1.0" encoding="utf-8"?>
-
<resources>
-
<declare-styleable name="Gallery">
-
<attr name="android:galleryItemBackground" />
-
</declare-styleable>
-
<!-- 定义layout 外部resource 的xml 文件,用来改变layout 的背景图。 -->
- </resources>
③ 修改main.xml布局,添加一个Gallery和一个ImageView
-
<?xml version="1.0" encoding="utf-8"?>
-
<AbsoluteLayout
-
android:id="@+id/widget_absolutelayout"
-
android:layout_width="fill_parent"
-
android:layout_height="fill_parent"
-
xmlns:android="http://schemas.android.com/apk/res/android"
-
>
-
<Gallery
-
android:layout_width="fill_parent"
-
android:layout_height="143px"
-
android:layout_x="0px"
-
android:layout_y="51px"
-
android:id="@+id/Gallery_preView">
-
</Gallery>
-
<ImageView
-
android:layout_width="239px"
-
android:layout_height="218px"
-
android:layout_x="38px"
-
android:layout_y="184px"
-
android:id="@+id/ImageView_photo">
-
</ImageView>
- </AbsoluteLayout>
④ 新建一个myImageAdapter类--Gallery的适配器,它继承于BaseAdapter类.
-
package zyf.Ex_Ctrl_10ME;
-
import android.view.View;
-
import android.view.ViewGroup;
-
import android.widget.BaseAdapter;
-
public class myImageAdapter extends BaseAdapter {
-
@Override
-
public int getCount() {
-
// TODO Auto-generated method stub
-
return 0;
-
}
-
@Override
-
public Object getItem(int position) {
-
// TODO Auto-generated method stub
-
return null;
-
}
-
@Override
-
public long getItemId(int position) {
-
// TODO Auto-generated method stub
-
return 0;
-
}
-
@Override
-
public View getView(int position, View convertView, ViewGroup parent) {
-
// TODO Auto-generated method stub
-
return null;
-
}
- }
⑤ 修改mainActivity.java,添加Gallery相关操作
-
package zyf.Ex_Ctrl_10ME;
-
-
import android.app.Activity;
-
import android.os.Bundle;
-
import android.view.View;
-
import android.widget.AdapterView;
-
import android.widget.Gallery;
-
import android.widget.ImageView;
-
import android.widget.Toast;
-
-
public class Ex_Ctrl_10ME extends Activity {
-
/** Called when the activity is first created. */
-
/*定义要使用的对象*/
-
private Gallery gallery;
-
private ImageView imageview;
-
private myImageAdapter imageadapter;
-
@Override
-
public void onCreate(Bundle savedInstanceState) {
-
super.onCreate(savedInstanceState);
-
setContentView(R.layout.main);
-
imageadapter=new myImageAdapter(this);
-
/* 通过findViewById 取得 资源对象*/
-
gallery=(Gallery)findViewById(R.id.Gallery_preView);
-
imageview=(ImageView)findViewById(R.id.ImageView_photo);
-
/*给Gallery设置适配器 把Ex_Ctrl_10ME类传入参数*/
-
gallery.setAdapter(imageadapter);
-
/*设置Gallery的点击事件监听器*/
-
gallery.setOnItemClickListener(newGallery.OnItemClickListener(){
-
@Override
-
public void onItemClick(AdapterView<?> parent, View v, int position,
-
long id) {
-
// TODO Auto-generated method stub
-
/*显示该图片是几号*/
-
Toast.makeText(Ex_Ctrl_10ME.this,
-
"这是图片:"+position+"号", Toast.LENGTH_SHORT).show();
-
-
/*设置大图片*/
-
imageview.setBackgroundResource(imageadapter.myImageIds[position]);
-
}
-
});
-
}
- }
⑥ 修改myImageAdapter.java文件,实现相簿浏览效果
-
package zyf.Ex_Ctrl_10ME;
-
-
import android.content.Context;
-
import android.content.res.TypedArray;
-
import android.view.View;
-
import android.view.ViewGroup;
-
import android.widget.BaseAdapter;
-
import android.widget.Gallery;
-
import android.widget.ImageView;
-
-
public class myImageAdapter extends BaseAdapter{//自定义的类变量
-
/*变量声明*/
-
int mGalleryItemBackground;
-
private Context context;//上下文
-
/* 构建一Integer array 并取得预加载Drawable 的图片id */
-
public Integer[] myImageIds = { R.drawable.photo1, R.drawable.photo2,
-
R.drawable.photo3, R.drawable.photo4, R.drawable.photo5,
-
R.drawable.photo6, };
-
/*自定义的构造方法*/
-
public myImageAdapter(Context context) {
-
// TODO Auto-generated constructor stub
-
this.context=context;
-
/*
-
* 使用在res/values/attrs.xml 中的<declare-styleable>定义 的Gallery 属性.
-
*/
-
TypedArray typed_array=context.obtainStyledAttributes(R.styleable.Gallery);
-
/* 取得Gallery 属性的Index id */
-
mGalleryItemBackground=typed_array.getResourceId(R.styleable.Gallery_android_galleryItemBackground,
0);
-
/* 让对象的styleable 属性能够反复使用 */
-
typed_array.recycle();
-
}
-
/* 重写的方法getCount,返回图片数目 */
-
@Override
-
public int getCount() {
-
// TODO Auto-generated method stub
-
return myImageIds.length;
-
}
-
/* 重写的方法getItemId,返回图像的数组id */
-
@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;
-
}
-
/* 重写的方法getView,返回一View 对象 */
-
@Override
-
public View getView(int position, View convertView, ViewGroup parent) {
-
// TODO Auto-generated method stub
-
/* 产生ImageView 对象 */
-
ImageView imageview = new ImageView(context);
-
/* 设置图片给imageView 对象 */
-
imageview.setImageResource(myImageIds[position]);
-
/* 重新设置图片的宽高 */
-
imageview.setScaleType(ImageView.ScaleType.FIT_XY);
-
/* 重新设置Layout 的宽高 */
-
imageview.setLayoutParams(new Gallery.LayoutParams(128, 128));
-
/* 设置Gallery 背景图 */
-
imageview.setBackgroundResource(mGalleryItemBackground);
-
/* 返回imageView 对象 */
-
return imageview;
-
}
- }
-