Android学习笔记之Gallery(2)

package xiaosi.gallery;import android.app.Activity;import android.content.Context;import android.content.res.TypedArray;import android.os.Bundle;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.ImageView;import android.widget.Toast;public class GalleryActivity extends Activity {    /** Called when the activity is first created. */    private Gallery gallery =null;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                gallery = (Gallery)findViewById(R.id.gallery);        //设置图片适配器        gallery.setAdapter(new ImageAdapter(this));        gallery.setSpacing(5);                //设置监听器        gallery.setOnItemClickListener(new OnItemClickListener() {                    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,    long arg3) {                Toast.makeText(GalleryActivity.this, "点击了第"+arg2+"张图片", Toast.LENGTH_LONG).show();            }        });    }}class ImageAdapter extends BaseAdapter{int mGalleryItemBackground;    private Context context;    //图片源数组    private Integer[] imageInteger={            R.drawable.a,            R.drawable.b,            R.drawable.c,            R.drawable.d    };    public ImageAdapter(Context c){        context = c;        TypedArray attr = context.obtainStyledAttributes(R.styleable.HelloGallery);                mGalleryItemBackground = attr.getResourceId(R.styleable.HelloGallery_android_galleryItemBackground, 0);                attr.recycle();    }    // 获取图片的个数    public int getCount() {        return imageInteger.length;    }    // 获取图片在库中的位置      public Object getItem(int position) {        return position;    }    // 获取图片ID      public long getItemId(int position) {        return position;    }    public View getView(int position, View convertView, ViewGroup parent) {            ImageView imageView = new ImageView(context);        // 给ImageView设置资源        imageView.setImageResource(imageInteger[position]);        // 设置显示比例类型          imageView.setScaleType(ImageView.ScaleType.FIT_XY);        // 设置布局 图片120*80         imageView.setLayoutParams(new Gallery.LayoutParams(180, 100));        imageView.setBackgroundResource(mGalleryItemBackground);                return imageView;    }}

mian.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout 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="wrap_content"        android:gravity="bottom"        android:background="?android:galleryItemBackground"/></LinearLayout>

创建一个新的XML文件在 res/values/目录下 attrs.xml命名。

<?xml version="1.0" encoding="utf-8"?><resources>        <declare-styleable name="HelloGallery">                <attr name="android:galleryItemBackground" />        </declare-styleable></resources>

这是一个定制的styleable资源,可以应用于一个布局。

作者：SJF0115 发表于2012-2-12 22:40:49 原文链接阅读：5 评论：0 查看评论

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