图片切换ImageSwitcher&Gallery

ImageSwitcher是Android中控制图片展示效果的一个控件，如：幻灯片效果...，颇有感觉啊。做相册一绝。

一、设计界面

　　1、打开“res/layout/activity_main.xml”文件。

　　打开activity_main.xml文件。

　　代码如下：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<ImageSwitcher
android:id="@+id/switcher"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" >
</ImageSwitcher>

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

</RelativeLayout>

二、程序文件　

　　打开“src/com.genwoxue.imageswitcher/MainActivity.java”文件。

　　然后输入以下代码：

import android.app.ActionBar.LayoutParams;
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.AdapterView.OnItemSelectedListener;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.ViewSwitcher.ViewFactory;

public class MainActivity extends Activity implements OnItemSelectedListener,ViewFactory{
//声明ImageSwitcher、Gallery
private ImageSwitcher  is = null;
private Gallery gallery = null;
//定义缩微图，图片已经复制到drawable-hdpi文件夹了
private Integer[] mThumbIds = {
R.drawable.a,
R.drawable.b,
R.drawable.c,
R.drawable.d,
R.drawable.e
};
//定义图
private Integer[] mImageIds = {
R.drawable.a,
R.drawable.b,
R.drawable.c,
R.drawable.d,
R.drawable.e
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);

is = (ImageSwitcher) findViewById(R.id.switcher);
is.setFactory(this);
//显示效果
is.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in));
is.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out));

gallery = (Gallery) findViewById(R.id.gallery);
gallery.setAdapter(new ImageAdapter(this));//类中要写构造参数
//设置OnItemSelected监听事件
gallery.setOnItemSelectedListener(this);
}

public class ImageAdapter extends BaseAdapter{
private Context mContext;
public ImageAdapter(Context c) {
// TODO 自动生成的构造函数存根
mContext = c;
}

@Override
public int getCount() {
// TODO 自动生成的方法存根
return mThumbIds.length;
}

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

@Override
public long getItemId(int position) {
return position;
}

@Override
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.e);
return i;
}

}

@Override
public void onItemSelected(AdapterView<?> parent, View view, int position,
long id) {
is.setImageResource(mImageIds[position]);
}

@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO 自动生成的方法存根

}

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

}

三、运行效果