gallery自制源码

package com.test.gallery; import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import android.app.Activity; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.util.Log; import android.view.ContextMenu; import android.view.Display; import android.view.View; import android.view.ViewGroup; import android.view.Window; import android.view.WindowManager; import android.view.ContextMenu.ContextMenuInfo; import android.widget.AdapterView; import android.widget.BaseAdapter; import android.widget.Gallery; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import android.widget.AdapterView.OnItemClickListener; import android.widget.Gallery.LayoutParams; public class testgallery extends Activity implements AdapterView.OnItemSelectedListener{ ImageView imageview[] = new ImageView[7]; TextView tv; public static int SCREEN_WIDTH; public static int SCREEN_HEIGHT; private static Integer white = R.drawable.white; private static Integer gray = R.drawable.gray; private static int current = 0; private static Integer[] STR = {R.string.str1, R.string.str2, R.string.str3, R.string.str4, R.string.str5, R.string.str6, R.string.str7}; private static Bitmap[] bm = new Bitmap[7]; private AsyncImageLoader asyncImageLoader = new AsyncImageLoader(); private Gallery g; //public static int white = R.drawable.white; /** Called when the activity is first created. */ public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //不显示程序的标题栏 requestWindowFeature(Window.FEATURE_NO_TITLE); //不显示系统的标题栏 getWindow().setFlags(WindowManager.LayoutParams. FLAG_FULLSCREEN ,WindowManager.LayoutParams. FLAG_FULLSCREEN); setContentView(R.layout.main); WindowManager windowmanager = getWindowManager(); Display display = windowmanager.getDefaultDisplay(); SCREEN_WIDTH = display.getWidth(); SCREEN_HEIGHT = display.getHeight(); //引用gallery组件 g = (Gallery) findViewById(R.id.gallery); //在此下面定制适配器 g.setAdapter(new ImageAdapter(this)); //设置画廊中的图片边距 g.setSpacing(2); g.setOnItemSelectedListener(this); imageview[0] = (ImageView) findViewById(R.id.imageView1); imageview[1] = (ImageView) findViewById(R.id.imageView2); imageview[2] = (ImageView) findViewById(R.id.imageView3); imageview[3] = (ImageView) findViewById(R.id.imageView4); imageview[4] = (ImageView) findViewById(R.id.imageView5); imageview[5] = (ImageView) findViewById(R.id.imageView6); imageview[6] = (ImageView) findViewById(R.id.imageView7); tv = (TextView) findViewById(R.id.text); //设置初始焦点位置 //g.setSelection(4); //g.setGravity(2);//0无效果 /*小图标组件*/ // ImageAdapter1 ia = new ImageAdapter1(this); // Gallery g1 = (Gallery) findViewById(R.id.gallery1); // g1.setAdapter(ia); // g1.setSpacing(1); // g1.setSelection(4); //设置一个itemclicklistener, g.setOnItemClickListener(new OnItemClickListener(){ public void onItemClick(AdapterView parent, View v, int position, long id) { //注释后 未显示短按组件 Toast.makeText(testgallery.this, "" + position, Toast.LENGTH_SHORT).show(); } }); //在gallery里，我们也可以通过longpressed items(及长按)显示一个上下文菜单 //注释后 未注册长按组件。 //registerForContextMenu(g); } //环境上下文创建时 public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo){ //注释掉后，长按无显示(无常见显示的组件) //menu.add("Testing"); } //这里是长按组件再点击的方法。 // public boolean onContextItemSelected(MenuItem item){ // AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo(); // Toast.makeText(this, "Longpress: " + info.position, Toast.LENGTH_SHORT).show(); // return true; // } public class ImageAdapter extends BaseAdapter{ int mGalleryItemBackground; private Context mContext; public ImageAdapter(Context c){ mContext = c; } public int getCount() { return imageurl.length; } public Object getItem(int position) { return position; } public long getItemId(int position) { return position; } public View getView(final int position, View convertView, ViewGroup parent) { ImageView i = new ImageView(mContext); //i.setPadding(10, 0, 5, 0); //设置图片边距 //i.setImageResource(mImageIds[position]); /*异步进行加载*/ // new Thread(){ // public void run(){ // URL url; // try { // if(bm[position] == null){ // url = new URL(imageurl[position]); // bm[position] = BitmapFactory.decodeStream(url.openStream()); // } // } catch (MalformedURLException e) { // e.printStackTrace(); // } catch (IOException e) { // e.printStackTrace(); // } // } // }.start(); // // if(bm[position] != null){ // i.setImageBitmap(bm[position]); // }else{ // i.setImageResource(mImageIds[0]); // } i.setTag(imageurl[position]); Drawable cachedImage = asyncImageLoader.loadDrawable(imageurl[position], new com.test.gallery.AsyncImageLoader.ImageCallback() { public void imageLoaded(Drawable imageDrawable, String url) { ImageView imageViewByTag = (ImageView) g.findViewWithTag(url); if (imageViewByTag != null) { imageViewByTag.setImageDrawable(imageDrawable); } } }); if (cachedImage == null) { i.setImageResource(mImageIds[0]); Log.e("Adapter", "null"); }else{ i.setImageDrawable(cachedImage); } i.setScaleType(ImageView.ScaleType.CENTER_CROP);//FIT_XY centerCrop //i.setLayoutParams(new Gallery.LayoutParams(20, 20));//136 88 //图片的宽高 i.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); //设置Gallery组件的背景风格 i.setBackgroundResource(mGalleryItemBackground); return i; } private String[] imageurl = { "http://pic0.qiyipic.com/common/20110214/768e29bae49148708c8341f8781c2a0a.jpg", "http://pic3.qiyipic.com/common/20110214/d5c22c49cce04f3d827961f9f615e9d1.jpg", "http://sports.tom.com/uldf/2011/0213/goujianzhen/fpx.jpg", "http://www.qiyipic.com/lvyou/fix/csmlga.jpg", "http://www.qiyipic.com/lvyou/fix/sqxy.jpg", "http://www.qiyipic.com/lvyou/fix/astrj.jpg", "http://www.qiyipic.com/thumb/20110223/v73694.jpg" }; private Integer[] mImageIds = { R.drawable.gallery_photo_1, R.drawable.gallery_photo_2, R.drawable.gallery_photo_3, R.drawable.gallery_photo_4, R.drawable.gallery_photo_5, R.drawable.gallery_photo_6, R.drawable.gallery_photo_7 }; } /* public class ImageAdapter1 extends BaseAdapter{ int mGalleryItemBackground; private Context mContext; public ImageAdapter1(Context c){ mContext = c; } public int getCount() { return mImIds.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 i = new ImageView(mContext); i.setImageResource(mImIds[position]); i.setScaleType(ImageView.ScaleType.CENTER_CROP);//FIT_XY centerCrop //设置Gallery组件的背景风格 i.setBackgroundResource(mGalleryItemBac