网络请求实现上拉加载以及图片修剪,imagelod配置er.doc

item_listview.xml Footview.xml MyAdapter.package adapter;import java.util.List;import com.example.jiazai.R;import com.example.vo.MusicList;import com.lidroid.xutils.BitmapUtils;import com.nostra13.universalimageloader.core.ImageLoader;import android.content.Context;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;public class MyAdapter extends BaseAdapter List list;Context context;ImageLoader il = ImageLoader.getInstance();public MyAdapter(List list, Context context) super();this.list = list;this.context = context;Overridepublic int getCount() / TODO Auto-generated method stubreturn list.size();Overridepublic Object getItem(int arg0) / TODO Auto-generated method stubreturn list.get(arg0);Overridepublic long getItemId(int position) / TODO Auto-generated method stubreturn position;Overridepublic View getView(final int position, View convertView, ViewGroup parent) / TODO Auto-generated method stubViewHolder vh;View view=convertView;if(view=null)vh=new ViewHolder();view=View.inflate(context, R.layout.item_listview, null);vh.tv_name=(TextView) view.findViewById(R.id.tv_name);vh.iv=(ImageView) view.findViewById(R.id.iv);view.setTag(vh);elsevh=(ViewHolder) view.getTag();/bitmapUtils.display(vh.iv, list.get(position).getMc_imageurl();il.displayImage(list.get(position).getMc_imageurl(), vh.iv);vh.tv_name.setText(list.get(position).getU_name();return view;class ViewHolderTextView tv_name;ImageView iv;MainActivity.javapackage com.example.jiazai;import java.util.ArrayList;import java.util.List;import com.example.vo.MusicList;import com.example.vo.PersonVo;import com.google.gson.Gson;import com.lidroid.xutils.HttpUtils;import com.lidroid.xutils.exception.HttpException;import com.lidroid.xutils.http.ResponseInfo;import com.lidroid.xutils.http.callback.RequestCallBack;import com.lidroid.xutils.http.client.HttpRequest.HttpMethod;import adapter.MyAdapter;import android.os.Bundle;import android.os.Handler;import android.app.Activity;import android.content.Intent;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.widget.AbsListView;import android.widget.AbsListView.OnScrollListener;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.Button;import android.widget.ListView;import android.widget.Toast;public class MainActivity extends Activity private ListView lv;private HttpUtils httpUtils;private int pager=1;private List list=new ArrayList();private MyAdapter adapter;private Button btn_foot;private boolean flag=true;Handler handler=new Handler();Overrideprotected void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);init();public void init()httpUtils=new HttpUtils();lv=(ListView) findViewById(R.id.lv);View footview=LayoutInflater.from(this).inflate(R.layout.footview, null);lv.addFooterView(footview);btn_foot=(Button) footview.findViewById(R.id.btn_foot);btn_foot.setOnClickListener(new OnClickListener() Overridepublic void onClick(View v) / TODO Auto-generated method stubbtn_foot.setText(正在加载.);handler.postDelayed(new Runnable() Overridepublic void run() / TODO Auto-generated method stubgetHttp();adapter.notifyDataSetChanged();btn_foot.setText(加载更多.);, 2000););/数据getHttp();adapter = new MyAdapter(list, this);lv.setAdapter(adapter);lv.setOnScrollListener(new OnScrollListener() Overridepublic void onScrollStateChanged(AbsListView view, int scrollState) / TODO Auto-generated method stubswitch (scrollState) case SCROLL_STATE_IDLE:/if(lv.getLastVisiblePosition()=(list.size()-1)/getHttp();/break;default:break;Overridepublic void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) );lv.setOnItemClickListener(new OnItemClickListener() Overridepublic void onItemClick(AdapterView arg0, View arg1, int arg2,long arg3) / TODO Auto-generated method stubIntent in=new Intent(MainActivity.this, DetilActivity.class);in.putExtra(123, list.get(arg2).getMc_imageurl();startActivity(in););public void getHttp()String url=6:8080/Music03/SelectMusic?u_id=&page=10&page_size=+pager;httpUtils.send(HttpMethod.GET, url, new RequestCallBack() Overridepublic void onFailure(HttpException arg0, String arg1) / TODO Auto-generated method stubLog.i(TAG, +请求失败);Overridepublic void onSuccess(ResponseInfo arg0) / TODO Auto-generated method stubLog.i(TAG, 服务器返回的数据=+arg0.result);Gson g=new Gson();PersonVo pv=g.fromJson(arg0.result, PersonVo.class);pager+;if(pv.getMusiclist().size()=10)list.addAll(pv.getMusiclist();adapter.notifyDataSetChanged();elseif(flag)list.addAll(pv.getMusiclist();adapter.notifyDataSetChanged();flag=false;elseToast.makeText(MainActivity.this, 没有更多数据了！, Toast.LENGTH_LONG).show(););ImageLoader的配置MyApplication.javapackage com.example.jiazai;import java.io.File;import android.app.Application;import android.graphics.Bitmap;import android.os.Environment;import com.nostra13.universalimageloader.cache.disc.impl.UnlimitedDiscCache;import com.nostra13.universalimageloader.cache.disc.naming.Md5FileNameGenerator;import com.nostra13.universalimageloader.cache.memory.impl.UsingFreqLimitedMemoryCache;import com.nostra13.universalimageloader.core.DisplayImageOptions;import com.nostra13.universalimageloader.core.ImageLoader;import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;import com.nostra13.universalimageloader.core.assist.ImageScaleType;import com.nostra13.universalimageloader.core.assist.QueueProcessingType;import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;import com.nostra13.universalimageloader.core.display.RoundedBitmapDisplayer;import com.nostra13.universalimageloader.core.download.BaseImageDownloader;public class MyApplication extends Application Overridepublic void onCreate() / TODO Auto-generated method stubsuper.onCreate();ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(this).memoryCacheExtraOptions(480, 800)/ max width, max height，即保存的每个缓存文件的最大长宽.discCacheExtraOptions(480, 800, null)/ Can slow ImageLoader, use it carefully (Better dont use/ it)/设置缓存的详细信息，最好不要设置这个.threadPoolSize(3)/ 线程池内加载的数量.threadPriority(Thread.NORM_PRIORITY - 2).denyCacheImageMultipleSizesInMemory().memoryCache(new UsingFreqLimitedMemoryCache(2 * 1024 * 1024)/ You can pass your own memory cache/ implementation/你可以通过自己的内存缓存实现.memoryCacheSize(2 * 1024 * 1024).discCacheSize(50 * 1024 * 1024).discCacheFileNameGenerator(new Md5FileNameGenerator()/ 将保存的时候的URI名称用MD5 加密.tasksProcessingOrder(QueueProcessingType.LIFO).discCacheFileCount(100)/ 缓存的文件数量.discCache(new UnlimitedDiscCache(new File(Environment.getExternalStorageDirectory()+ /myApp/imgCache)/ 自定义缓存路径.defaultDisplayImageOptions(getDisplayOptions().imageDownloader(new BaseImageDownloader(this, 5 * 1000, 30 * 1000).writeDebugLogs() / Remove for release app.build();/ 开始构建ImageLoader.getInstance().init(config);private DisplayImageOptions getDisplayOptions() DisplayImageOptions options;options = new DisplayImageOptions.Builder().showImageOnLoading(R.drawable.ic_launcher) / 设置图片在下载期间显示的图片.showImageForEmptyUri(R.drawable.ic_launcher)/ 设置图片Uri为空或是错误的时候显示的图片.showImageOnFail(R.drawable.ic_launcher) / 设置图片加载/解码过程中错误时候显示的图片.cacheInMemory(true)/ 设置下载的图片是否缓存在内存中.cacheOnDisc(true)/ 设置下载的图片是否缓存在SD卡中.considerExifParams(true) / 是否考虑JPEG图像EXIF参数（旋转，翻转）.imageScaleType(ImageScaleType.EXACTLY_STRETCHED)/ 设置图片以如何的编码方式显示.bitmapConfig(Bitmap.Config.RGB_565)/ 设置图片的解码类型/ .delayBeforeLoading(int delayInMillis)/int/ delayInMillis为你设置的下载前的延迟时间/ 设置图片加入缓存前，对bitmap进行设置/ .preProcessor(BitmapProcessor preProcessor).resetViewBeforeLoading(true)/ 设置图片在下载前是否重置，复位.displayer(new RoundedBitmapDisplayer(20)/ 是否设置为圆角，弧度为多少.displayer(new FadeInBitmapDisplayer(100)/ 是否图片加载好后渐入的动画时间.build();/ 构建完成return options;自定义imageviewMyImageView.javapackage com.example.jiazai;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.PorterDuff.Mode;import android.graphics.PorterDuffXfermode;import android.graphics.Rect;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.widget.ImageView;public class MyImageView extends ImageView public MyImageView(Context context, AttributeSet attrs) super(context, attrs);/ TODO Auto-generated constructor stub/* * 自定义绘制图形 */protected void onDraw(Canvas canvas) / 得到引入的图片Drawable drawable = getDrawable();/ 如果引入的图片为空，代码执行结束if (drawable = null) return;/ 如果引入的图片宽高为0，代码执行结束if (getWidth() = 0 | getHeight() = 0) return;/ 将引入的图片转为bitmapBitmap b = (BitmapDrawable) drawable).getBitmap();/ 如果bitmap为空，代码执行结束if (null = b) return;/ 复制得到一个bitmapBitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);/ 得到imageview本身的宽高int w = getWidth(), h = getHeight();/ 自定义方法得到圆形的bitmapBitmap roundBitmap = getCroppedBitmap(bitmap, w);/ 画出得到的bitmapcanvas.drawBitmap(roundBitmap, 0, 0, null);public static Bitmap getCropp