Android ImageSwitcher和Gallery 综合使用

一个简易的相册

功能描述： 点击按钮进入下一屏，在屏幕上面展示一个大图，在屏幕的下面是一组可以滚动的图片，点击滚动的图片可以显示在上面的控件中。

效果图如下：

 

 

 

 

开发环境：eclipse3.4.2  AndroidSDK2.0 ADT0.9.7

代码：

1.MainActivity 单击按钮时，跳转到 ImageShowActivity

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

<?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

<?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

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

<?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！