android---图片切换

1、布局

<?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"
    android:orientation="vertical" >

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

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

</RelativeLayout>

2、Activity

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

public class ImageActivity extends Activity implements ViewFactory {

private ImageSwitcher imageSwitcher;

private Gallery gallery;

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  requestWindowFeature(Window.FEATURE_NO_TITLE);
  setContentView(R.layout.imagelayout);

  imageSwitcher = (ImageSwitcher) findViewById(R.id.imageswitcher);
  imageSwitcher.setFactory(this);
  imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,
    android.R.anim.fade_in));
  imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,
    android.R.anim.fade_out));

  gallery = (Gallery) findViewById(R.id.gallery);
  ImageAdapter imageAdapter = new ImageAdapter(this);
  gallery.setAdapter(imageAdapter);
  gallery.setOnItemSelectedListener(new OnItemSelectedListener() {

   @Override
   public void onItemSelected(AdapterView<?> arg0, View arg1,
     int index, long arg3) {
    imageSwitcher.setImageResource(ConstData.imageId[index]);
   }

   @Override
   public void onNothingSelected(AdapterView<?> arg0) {

   }
  });
}

@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;

}

}


3、Adapter

import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;

public class ImageAdapter extends BaseAdapter {

private ImageActivity imageActivity;

public ImageAdapter(ImageActivity imageActivity) {
  this.imageActivity = imageActivity;
}

@Override
public int getCount() {
  // TODO Auto-generated method stub
  return ConstData.imageId.length;
}

@Override
public Object getItem(int i) {
  // TODO Auto-generated method stub
  return i;
}

@Override
public long getItemId(int i) {
  // TODO Auto-generated method stub
  return i;
}

@Override
public View getView(int i, View view, ViewGroup viewgroup) {
  ImageView imageView = null;
  imageView = new ImageView(imageActivity);
  imageView.setLayoutParams(new Gallery.LayoutParams(
    LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
  imageView.setAdjustViewBounds(true);
  imageView.setImageResource(ConstData.imageId[i]);
  return imageView;
}

}