android Gallery画廊实例

package com.test; import android.app.ActionBar.LayoutParams; import android.app.Activity; import android.content.Context; import android.content.res.TypedArray; import android.os.Bundle; import android.view.View; import android.view.ViewGroup; import android.view.animation.AnimationUtils; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.AdapterView.OnItemSelectedListener; import android.widget.BaseAdapter; import android.widget.Gallery; import android.widget.ImageSwitcher; import android.widget.ImageView; import android.widget.Toast; import android.widget.ViewSwitcher.ViewFactory; public class GalleryMainActivity extends Activity implements OnItemSelectedListener, ViewFactory { /** Called when the activity is first created. */ private ImageSwitcher imageSwitcher; private Context mContext; // 图片数组 private Integer[] mImageIds = { R.drawable.g1, R.drawable.g2, R.drawable.g3, R.drawable.g4, R.drawable.g5, R.drawable.g6, R.drawable.g7, R.drawable.g8, R.drawable.g9 }; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); final ImageView iv = (ImageView) findViewById(R.id.ImageView01); Gallery g = (Gallery) findViewById(R.id.Gallery01); ImageSwitcher imageSwitcher = (ImageSwitcher) findViewById(R.id.imageSwitcher); // 设置图片匹适配器 g.setAdapter(new ImageAdapter(this)); g.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // TODO Auto-generated method stub // 显示点击的是第几张图片 Toast.makeText(GalleryMainActivity.this, "" + position%mImageIds.length, Toast.LENGTH_LONG).show(); // 设置背景部分的ImageView显示当前Item的图片 iv.setImageResource(((ImageView) view).getId()); } }); imageSwitcher.setFactory(this); // 设置ImageSwitcher组件显示图像的动画效果 imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in)); imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out)); } public class ImageAdapter extends BaseAdapter { int mGalleryItemBackground; // 上下文对象 // 构造方法 public ImageAdapter(Context c) { mContext = c; // 读取styleable资源 TypedArray a = obtainStyledAttributes(R.styleable.HelloGallery); mGalleryItemBackground = a.getResourceId( R.styleable.HelloGallery_android_galleryItemBackground, 0); a.recycle(); } @Override public int getCount() { // TODO Auto-generated method stub return Integer.MAX_VALUE; } @Override public Object getItem(int position) { // TODO Auto-generated method stub return position; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getView(int position, View arg1, ViewGroup arg2) { ImageView iv = new ImageView(mContext); iv.setImageResource(mImageIds[position % mImageIds.length]); // 给生成的ImageView设置Id，不设置的话Id都是-1 iv.setId(mImageIds[position % mImageIds.length]); iv.setLayoutParams(new Gallery.LayoutParams(120, 160)); iv.setScaleType(ImageView.ScaleType.FIT_XY); iv.setBackgroundResource(mGalleryItemBackground); return iv; } } @Override 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; } @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { // TODO Auto-generated method stub imageSwitcher.setImageResource(mImageIds[position % mImageIds.length]); } @Override public void onNothingSelected(AdapterView<?> parent) { // TODO Auto-generated method stub } }