【android中级】之Android ImageSwitcher和Gallery 综合使用

做相册和带图片查看功能的应用都应该用得上

1.MainActivity 单击按钮时，跳转到 ImageShowActivity

Java代码

1. package com.small.photos; 
2.  
3. import com.small.photos.R; 
4. import android.widget.*; 
5. import android.app.Activity; 
6. import android.content.Intent; 
7. import android.os.Bundle; 
8. import android.view.View; 
9. import android.view.View.OnClickListener; 
10.  
11. public class MainActivityextends Activity { 
12.  
13.     OnClickListener listener0 = null; 
14.     Button button0; 
15.  
16.     @Override 
17.     public void onCreate(Bundle savedInstanceState) { 
18.         super.onCreate(savedInstanceState); 
19.         setContentView(R.layout.main); 
20.  
21.         // 单击按钮跳转到ImageShowActivity 
22.         listener0 = new OnClickListener() { 
23.             public void onClick(View v) { 
24.                 Intent intent = new Intent(MainActivity.this, 
25.                         ImageShowActivity.class); 
26.                 startActivity(intent); 
27.             } 
28.         }; 
29.  
30.         button0 = (Button) findViewById(R.id.image_show_button); 
31.         button0.setOnClickListener(listener0); 
32.     } 
33.  
34. } 

package com.small.photos;

import com.small.photos.R;
import android.widget.*;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;

public class MainActivity extends Activity {

	OnClickListener listener0 = null;
	Button button0;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		// 单击按钮跳转到ImageShowActivity
		listener0 = new OnClickListener() {
			public void onClick(View v) {
				Intent intent = new Intent(MainActivity.this,
						ImageShowActivity.class);
				startActivity(intent);
			}
		};

		button0 = (Button) findViewById(R.id.image_show_button);
		button0.setOnClickListener(listener0);
	}

}

2. main.xml  定义入口按钮

Java代码

1. <?xml version="1.0" encoding="utf-8"?> 
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
3.     android:orientation="vertical" 
4.     android:layout_width="fill_parent" 
5.     android:layout_height="fill_parent" 
6.     > 
7. <Button android:id="@+id/image_show_button"   
8.             android:text="ImageSwitcher Gallery"   
9.             android:layout_width="wrap_content"   
10.             android:layout_height="wrap_content">   
11.     </Button>   
12. </LinearLayout> 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
 <Button android:id="@+id/image_show_button"  
            android:text="ImageSwitcher Gallery"  
            android:layout_width="wrap_content"  
            android:layout_height="wrap_content">  
    </Button>  
</LinearLayout>

3.image_show.xml 

    ImageSwitcher是用来图片显示那块区域的控件  Gallery 是来控制底下那个图标列表索引用的

Java代码

1. <?xml version="1.0" encoding="utf-8"?> 
2. <RelativeLayout 
3.    xmlns:android="http://schemas.android.com/apk/res/android" 
4.    android:layout_width="fill_parent" 
5.    android:layout_height="fill_parent"> 
6.    
7.   <ImageSwitcher android:id="@+id/ImageSwitcher01" 
8.      android:layout_height="fill_parent" 
9.     android:layout_width="fill_parent" 
10.     android:layout_alignParentTop="true" 
11.     android:layout_alignParentLeft="true"> 
12.     </ImageSwitcher> 
13.      
14.      
15.    <Gallery  
16.      android:id="@+id/gallery" 
17.      android:background="#55000000" 
18.      android:layout_width="fill_parent" 
19.      android:layout_height="60dp" 
20.      android:layout_alignParentBottom="true" 
21.      android:layout_alignParentLeft="true"   
22.      android:gravity="center_vertical" 
23.      android:spacing="16dp" /> 
24.    
25.  
26.  
27. </RelativeLayout> 

<?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">
  
  <ImageSwitcher android:id="@+id/ImageSwitcher01"
     android:layout_height="fill_parent"
    android:layout_width="fill_parent"
    android:layout_alignParentTop="true"
  	android:layout_alignParentLeft="true">
  	</ImageSwitcher>
  	
  	
   <Gallery 
     android:id="@+id/gallery"
     android:background="#55000000"
     android:layout_width="fill_parent"
     android:layout_height="60dp"
     android:layout_alignParentBottom="true"
     android:layout_alignParentLeft="true"	
     android:gravity="center_vertical"
     android:spacing="16dp" />
  


</RelativeLayout>

4.ImageShowActivity

R.drawable.sample_thumb_0 为图片的标识

图片放在res/drawable/目录下  图片名称为sample_thumb_0.gif

Java代码

1. package com.small.photos; 
2.  
3. import android.app.Activity; 
4. import android.content.Context; 
5. import android.os.Bundle; 
6. import android.view.View; 
7. import android.view.ViewGroup; 
8. import android.view.Window; 
9. import android.view.animation.AnimationUtils; 
10. import android.widget.AdapterView; 
11. import android.widget.BaseAdapter; 
12. import android.widget.Gallery; 
13. import android.widget.ImageSwitcher; 
14. import android.widget.ImageView; 
15. import android.widget.AdapterView.OnItemSelectedListener; 
16. import android.widget.RelativeLayout.LayoutParams; 
17. import android.widget.ViewSwitcher.ViewFactory; 
18.  
19. public class ImageShowActivityextends Activityimplements ViewFactory, 
20.         OnItemSelectedListener { 
21.     /** Called when the activity is first created. */ 
22.     ImageSwitcher mSwitcher; 
23.     private Integer[] mThumbIds = { R.drawable.sample_thumb_0, 
24.             R.drawable.sample_thumb_1, R.drawable.sample_0, R.drawable.sample_1 }; 
25.  
26.     private Integer[] mImageIds = { R.drawable.sample_thumb_0, 
27.             R.drawable.sample_thumb_1, R.drawable.sample_0, R.drawable.sample_1 }; 
28.  
29.     @Override 
30.     public void onCreate(Bundle savedInstanceState) { 
31.         super.onCreate(savedInstanceState); 
32.         requestWindowFeature(Window.FEATURE_NO_TITLE); 
33.  
34.         setContentView(R.layout.image_show); 
35.         setTitle("ImageShowActivity"); 
36.  
37.         mSwitcher = (ImageSwitcher) findViewById(R.id.ImageSwitcher01); 
38.         // 系统的anim中的fade_in.xml 
39.         mSwitcher.setFactory(this); 
40.         mSwitcher.setInAnimation(AnimationUtils.loadAnimation(this, 
41.                 android.R.anim.fade_in)); 
42.         mSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this, 
43.                 android.R.anim.fade_out)); 
44.  
45.         Gallery g = (Gallery) findViewById(R.id.gallery); 
46.         // 为缩略图浏览器指定一个适配器 
47.         g.setAdapter(new ImageAdapter(this)); 
48.         // 响应 在缩略图列表上选中某个缩略图后的 事件 
49.         g.setOnItemSelectedListener(this); 
50.  
51.     } 
52.  
53.     @SuppressWarnings("unchecked") 
54.     public void onItemSelected(AdapterView parent, View v,int position,long id) { 
55.         mSwitcher.setImageResource(mImageIds[position]); 
56.     } 
57.  
58.     @SuppressWarnings("unchecked") 
59.     public void onNothingSelected(AdapterView parent) { 
60.     } 
61.  
62.     @Override 
63.     public View makeView() { 
64.         ImageView i = new ImageView(this); 
65.         i.setBackgroundColor(0xFF000000); 
66.         i.setScaleType(ImageView.ScaleType.FIT_CENTER); 
67.         i.setLayoutParams(new ImageSwitcher.LayoutParams( 
68.                 LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); 
69.         return i; 
70.     } 
71.  
72.     public class ImageAdapterextends BaseAdapter { 
73.         private Context mContext; 
74.  
75.         public ImageAdapter(Context c) { 
76.             mContext = c; 
77.         } 
78.  
79.         public int getCount() { 
80.             return mThumbIds.length; 
81.         } 
82.  
83.         public Object getItem(int position) { 
84.             return position; 
85.         } 
86.  
87.         public long getItemId(int position) { 
88.             return position; 
89.         } 
90.          
91.         //getView方法动态生成一个ImageView,然后利用setLayoutParams、setImageResource、 
92.         //setBackgroundResource分别设定图片大小、图片源文件和图片背景。当图片被显示到当前 
93.         //屏幕的时候，这个函数就会被自动回调来提供要显示的ImageView 
94.         public View getView(int position, View convertView, ViewGroup parent) { 
95.             ImageView i = new ImageView(mContext); 
96.  
97.             i.setImageResource(mThumbIds[position]); 
98.             i.setAdjustViewBounds(true); 
99.             i.setLayoutParams(new Gallery.LayoutParams( 
100.                     LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); 
101.             i.setBackgroundResource(R.drawable.picture_frame); 
102.             return i; 
103.         } 
104.  
105.     } 
106.  
107. } 

package com.small.photos;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.RelativeLayout.LayoutParams;
import android.widget.ViewSwitcher.ViewFactory;

public class ImageShowActivity extends Activity implements ViewFactory,
		OnItemSelectedListener {
	/** Called when the activity is first created. */
	ImageSwitcher mSwitcher;
	private Integer[] mThumbIds = { R.drawable.sample_thumb_0,
			R.drawable.sample_thumb_1, R.drawable.sample_0, R.drawable.sample_1 };

	private Integer[] mImageIds = { R.drawable.sample_thumb_0,
			R.drawable.sample_thumb_1, R.drawable.sample_0, R.drawable.sample_1 };

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);

		setContentView(R.layout.image_show);
		setTitle("ImageShowActivity");

		mSwitcher = (ImageSwitcher) findViewById(R.id.ImageSwitcher01);
		// 系统的anim中的fade_in.xml
		mSwitcher.setFactory(this);
		mSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,
				android.R.anim.fade_in));
		mSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,
				android.R.anim.fade_out));

		Gallery g = (Gallery) findViewById(R.id.gallery);
		// 为缩略图浏览器指定一个适配器
		g.setAdapter(new ImageAdapter(this));
		// 响应 在缩略图列表上选中某个缩略图后的 事件
		g.setOnItemSelectedListener(this);

	}

	@SuppressWarnings("unchecked")
	public void onItemSelected(AdapterView parent, View v, int position, long id) {
		mSwitcher.setImageResource(mImageIds[position]);
	}

	@SuppressWarnings("unchecked")
	public void onNothingSelected(AdapterView parent) {
	}

	@Override
	public View makeView() {
		ImageView i = new ImageView(this);
		i.setBackgroundColor(0xFF000000);
		i.setScaleType(ImageView.ScaleType.FIT_CENTER);
		i.setLayoutParams(new ImageSwitcher.LayoutParams(
				LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
		return i;
	}

	public class ImageAdapter extends BaseAdapter {
		private Context mContext;

		public ImageAdapter(Context c) {
			mContext = c;
		}

		public int getCount() {
			return mThumbIds.length;
		}

		public Object getItem(int position) {
			return position;
		}

		public long getItemId(int position) {
			return position;
		}
        
		//getView方法动态生成一个ImageView,然后利用setLayoutParams、setImageResource、
		//setBackgroundResource分别设定图片大小、图片源文件和图片背景。当图片被显示到当前
		//屏幕的时候，这个函数就会被自动回调来提供要显示的ImageView
		public View getView(int position, View convertView, ViewGroup parent) {
			ImageView i = new ImageView(mContext);

			i.setImageResource(mThumbIds[position]);
			i.setAdjustViewBounds(true);
			i.setLayoutParams(new Gallery.LayoutParams(
					LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
			i.setBackgroundResource(R.drawable.picture_frame);
			return i;
		}

	}

}

  5.AndroidManifest.xml  标识MainActivity为一个程序的开始

Java代码

1. <?xml version="1.0" encoding="utf-8"?> 
2. <manifest xmlns:android="http://schemas.android.com/apk/res/android" 
3.       package="com.small.photos" 
4.       android:versionCode="1" 
5.       android:versionName="1.0"> 
6.     <application android:label="@string/app_name"> 
7.         <activity android:name=".ImageShowActivity" 
8.                   android:label="@string/app_name"> 
9.              
10.         </activity> 
11.  
12.     <activity android:name="MainActivity"><intent-filter><action android:name="android.intent.action.MAIN"></action> 
13. <category android:name="android.intent.category.LAUNCHER"></category> 
14. </intent-filter> 
15. </activity> 
16. </application> 
17.  
18.  
19. </manifest>  

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.small.photos"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:label="@string/app_name">
        <activity android:name=".ImageShowActivity"
                  android:label="@string/app_name">
            
        </activity>

    <activity android:name="MainActivity"><intent-filter><action android:name="android.intent.action.MAIN"></action>
<category android:name="android.intent.category.LAUNCHER"></category>
</intent-filter>
</activity>
</application>


</manifest> 

基本上就是这些了，然后启动吧！