ImageSwitcher的使用(一):与Gallery配合使用

package com.example.androidtest;

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.content.res.TypedArray;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.ViewSwitcher.ViewFactory;
import android.util.Log;

public class MainActivity extends Activity implements ViewFactory {

Integer[] imageIDs = {R.drawable.ic_launcher, R.drawable.ic_launcher};
private ImageSwitcher imageSwitcher;

public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

imageSwitcher = (ImageSwitcher)findViewById(R.id.switcher1);
imageSwitcher.setFactory(this);
imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.slide_in_left));
imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.slide_out_right));

Gallery gallery = (Gallery)findViewById(R.id.gallery1);
gallery.setAdapter(new ImageAdapter(this));
gallery.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long id)
{
imageSwitcher.setImageResource(imageIDs[position]);
Log.d("wuli", "position:" + position + " id:" + id);
}
});
}

public View makeView()
{
ImageView imageView = new ImageView(this);
imageView.setBackgroundColor(0xff000000);
imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
imageView.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
return imageView;
}

public class ImageAdapter extends BaseAdapter
{
private Context context;
private int itemBackground;

public ImageAdapter(Context c)
{
context = c;
TypedArray a = obtainStyledAttributes(R.styleable.Gallery1);
itemBackground = a.getResourceId(R.styleable.Gallery1_android_galleryItemBackground, 0);
a.recycle();
}

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

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

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

public View getView(int position, View convertView, ViewGroup parent)
{
ImageView imageView = new ImageView(context);

Log.d("wuli", "position:" + position);
imageView.setImageResource(imageIDs[position]);
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
imageView.setLayoutParams(new Gallery.LayoutParams(150, 120));
imageView.setBackgroundResource(itemBackground);

return imageView;
}
}
}

在res\values下新建styleable.xml:

<?xml version="1.0" encoding="UTF-8"?>
<resources>
<declare-styleable name="Gallery1">
<attr name="android:galleryItemBackground" />
</declare-styleable>
</resources>

activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#ff000000" >

<ImageSwitcher
android:id="@+id/switcher1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentBottom="true" />

<Gallery
android:id="@+id/gallery1"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />

</RelativeLayout>