Android圖片浏覽器之實現顯示圖片的標題

這裡有篇文章（http://www.linuxidc.com/Linux/2011-09/42550.htm）只是單純的顯示一個圖片，雖然我改進了，但是在使用的時候還是有一些地方不足。所以再次重寫，在原來的基礎上實現了以下小特點：

1、可以顯示標題：

2、原來的滑動速度非常快，這裡給它的速度降低了。

主要是重寫了Gallery。

廢話少說，源碼如下：

1. package cn.yj3g.GalleryTest2;  
2.   
3. import java.util.HashMap;  
4.   
5. import Android.app.Activity;  
6. import android.content.Context;  
7. import android.content.res.TypedArray;  
8. import android.os.Bundle;  
9. import android.util.Log;  
10. import android.view.LayoutInflater;  
11. import android.view.View;  
12. import android.view.ViewGroup;  
13. import android.view.Window;  
14. import android.view.animation.AnimationUtils;  
15. import android.widget.AdapterView;  
16. import android.widget.BaseAdapter;  
17. import android.widget.Gallery;  
18. import android.widget.Gallery.LayoutParams;  
19. import android.widget.ImageSwitcher;  
20. import android.widget.ImageView;  
21. import android.widget.TextView;  
22. import android.widget.ViewSwitcher;  
23.   
24. public class GalleryTestActivity extends Activity implements AdapterView.OnItemClickListener,  
25.         ViewSwitcher.ViewFactory {  
26.   
27.     @Override  
28.     public void onCreate(Bundle savedInstanceState) {  
29.         super.onCreate(savedInstanceState);  
30.         requestWindowFeature(Window.FEATURE_NO_TITLE);  
31.   
32.           
33.         setContentView(R.layout.image_switcher_1);  
34.   
35.         mSwitcher = (ImageSwitcher) findViewById(R.id.switcher);  
36.         mSwitcher.setFactory(this);  
37.         mSwitcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in));  
38.         mSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out));  
39.   
40.         Gallery g = (Gallery) findViewById(R.id.gallery);  
41.         g.setAdapter(new ImageAdapter(this, mThumbIds.length));  
42.         g.setOnItemClickListener(this);  
43.     //  g.setOnItemSelectedListener(this);   
44.         g.setSelection(1);  
45.     }  
46.   
47.       
48.     public void onItemSelected(AdapterView parent, View v, int position, long id) {  
49.         mSwitcher.setImageResource(mThumbIds[position % mImageIds.length]);  
50.     }  
51.   
52.     public void onNothingSelected(AdapterView parent) {  
53.     }  
54.       
55.     @Override  
56.     public View makeView() {  
57.         Log.v("TAG", "makeView()");  
58.         ImageView i = new ImageView(this);  
59.         i.setBackgroundColor(0xFF000000);  
60.         i.setScaleType(ImageView.ScaleType.FIT_CENTER);  
61.         i.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.MATCH_PARENT,  
62.                 LayoutParams.MATCH_PARENT));  
63.         return i;  
64.     }  
65.   
66.     private ImageSwitcher mSwitcher;  
67.   
68.     public class ImageAdapter extends BaseAdapter {  
69.         private int mGalleryItemBackground;  
70.         private HashMap<Integer, View> mViewMaps;  
71.         private int mCount;  
72.         private LayoutInflater mInflater;  
73.   
74.         public ImageAdapter(Context c, int count) {  
75.             this.mCount = count;  
76.             mViewMaps = new HashMap<Integer, View>(count);  
77.             mInflater = LayoutInflater.from(GalleryTestActivity.this);  
78.             // See res/values/attrs.xml for the <declare-styleable> that defines   
79.             // Gallery1.   
80.             TypedArray a = obtainStyledAttributes(R.styleable.Gallery1);  
81.             mGalleryItemBackground = a.getResourceId(  
82.                     R.styleable.Gallery1_android_galleryItemBackground, 0);  
83.             a.recycle();  
84.         }  
85.   
86.         public int getCount() {  
87.             // return mImageIds.length;   
88.             return Integer.MAX_VALUE;  
89.         }  
90.   
91.         public Object getItem(int position) {  
92.             return position;  
93.         }  
94.   
95.         public long getItemId(int position) {  
96.             return position;  
97.         }  
98.   
99.         public View getView(int position, View convertView, ViewGroup parent) {  
100.             Log.v("TAG", "getView() position=" + position + " convertView=" + convertView);  
101.             View viewGroup = mViewMaps.get(position%mCount);  
102.             ImageView imageView = null;  
103.             TextView textView = null;  
104.             if(viewGroup==null) {  
105.                 viewGroup = mInflater.inflate(R.layout.gallery_item, null);  
106.                 imageView = (ImageView) viewGroup.findViewById(R.id.item_gallery_image);  
107.                 textView = (TextView) viewGroup.findViewById(R.id.item_gallery_text);  
108.                 imageView.setBackgroundResource(mGalleryItemBackground);  
109.                 mViewMaps.put(position%mCount, viewGroup);  
110.                 imageView.setImageResource(mImageIds[position % mImageIds.length]);  
111.                 textView.setText(titles[position % mImageIds.length]);  
112.             }   
113.               
114.             return viewGroup;  
115.         }  
116.     }  
117.       
118.     private String[] titles = {"標題1","標題2","標題3","標題4","標題5","標題6","標題7","標題8",};  
119.     private Integer[] mThumbIds = { R.drawable.sample_0, R.drawable.sample_1, R.drawable.sample_2,  
120.             R.drawable.sample_3, R.drawable.sample_4, R.drawable.sample_5, R.drawable.sample_6,  
121.             R.drawable.sample_7 };  
122.   
123.     private Integer[] mImageIds = { R.drawable.sample_thumb_0, R.drawable.sample_thumb_1,  
124.             R.drawable.sample_thumb_2, R.drawable.sample_thumb_3, R.drawable.sample_thumb_4,  
125.             R.drawable.sample_thumb_5, R.drawable.sample_thumb_6, R.drawable.sample_thumb_7 };  
126.   
127.     @Override  
128.     public void onItemClick(AdapterView<?> parent, View view, int position, long id) {  
129.         mSwitcher.setImageResource(mThumbIds[position % mImageIds.length]);  
130.     }  
131.   
132. }