ANDROID笔记:Gallery的简单使用

 1 package com.example.adaptertest.gallery;
 2 
 3 import android.app.Activity;
 4 import android.os.Bundle;
 5 import android.os.Handler;
 6 import android.os.Handler.Callback;
 7 import android.os.Message;
 8 import android.view.View;
 9 import android.widget.AdapterView;
10 import android.widget.AdapterView.OnItemClickListener;
11 import android.widget.AdapterView.OnItemSelectedListener;
12 import android.widget.Gallery;
13 import android.widget.Toast;
14 
15 import com.example.adaptertest.R;
16 
17 @SuppressWarnings("deprecation")
18 public class GalleryActivity extends Activity {
19     int[] images = { R.drawable.a1, R.drawable.a2, R.drawable.a3, R.drawable.a4 };
20     // 可以用AdapterViewFlipper替换
21     Gallery gallery;
22     int counter = 0;
23 
24     @Override
25     protected void onCreate(Bundle savedInstanceState) {
26         super.onCreate(savedInstanceState);
27         setContentView(R.layout.gallerytest);
28 
29         gallery = (Gallery) findViewById(R.id.gallery_id);
30         gallery.setAdapter(new GalleryAdapter(GalleryActivity.this, images));
31         handler.sendEmptyMessageDelayed(1, 5000);
32         // 得到gallery选中的item的ID
33         // gallery.getSelectedItemId();
34         gallery.setOnItemClickListener(new OnItemClickListener() {
35 
36             @Override
37             public void onItemClick(AdapterView<?> parent, View view,
38                     int position, long id) {
39                 Toast.makeText(GalleryActivity.this, position + "",
40                         Toast.LENGTH_LONG).show();
41                 // 移除消息队列（点击图片事停止图片自动滚动）
42                 handler.removeMessages(1);
43             }
44         });
45         // 最前端的图片
46         gallery.setOnItemSelectedListener(new OnItemSelectedListener() {
47 
48             @Override
49             public void onItemSelected(AdapterView<?> parent, View view,
50                     int position, long id) {
51                 Toast.makeText(GalleryActivity.this, position + "",
52                         Toast.LENGTH_LONG).show();
53 
54             }
55 
56             @Override
57             public void onNothingSelected(AdapterView<?> parent) {
58                 Toast.makeText(GalleryActivity.this, "nothing",
59                         Toast.LENGTH_LONG).show();
60             }
61         });
62 
63     }
64 
65     Handler handler = new Handler(new Callback() {
66 
67         @Override
68         public boolean handleMessage(Message msg) {
69             if (msg.what == 1) {
70                 counter++;
71                 if (counter >= images.length) {
72                     counter = 0;
73                 }
74                 // 更换图片
75                 gallery.setSelection(counter);
76                 // 继续发送消息到队列（类似递归）
77                 handler.sendEmptyMessageDelayed(1, 5000);
78             }
79             return true;
80         }
81     });
82 }

package com.example.adaptertest.gallery;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;

public class GalleryAdapter extends BaseAdapter {
    private int[] images;
    private Context context;

    public GalleryAdapter(Context convertView, int[] images) {
        this.context = convertView;
        this.images = images;

    }

    @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;
    }

    @SuppressWarnings("deprecation")
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        ImageView imageView = new ImageView(context);
        imageView.setImageResource(images[position]);
        imageView.setScaleType(ScaleType.FIT_XY);
        imageView.setLayoutParams(new Gallery.LayoutParams(500, 500));
        return imageView;
    }

}

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical" >
 6 
 7     <Gallery
 8         android:id="@+id/gallery_id"
 9         android:layout_width="wrap_content"
10         android:layout_height="wrap_content"
11         android:spacing="-20px"
12         android:unselectedAlpha="150" />
13 
14 </LinearLayout>
15 <!-- android:unselectedAlpha="150" 未被选择的图片的透明度 -->
16 <!-- android:spacing="-20px" 间隔 -->