MainActivity
package com.example.imageloader;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ListView;
import com.nostra13.universalimageloader.core.ImageLoader;
public class MainActivity extends AppCompatActivity {
private ListView news;
private MyBaseAdafter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
news = findViewById(R.id.news);
mAdapter = new MyBaseAdafter(this);
news.setAdapter(mAdapter);
findViewById(R.id.left).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//加载数据
NetUtil.getInstance().getRequest("http://api.expoon.com/AppNews/getNewsList/type/1/p/1", Bean.class, new NetUtil.Callbak<Bean>() {
@Override
public void onSuccess(Bean o) {
mAdapter.setListData(o.getData());
}
});
}
});
}
}
BaseAdapter页面
package com.example.imageloader;
import android.content.Context;
import android.graphics.Bitmap;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.assist.FailReason;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;
import com.nostra13.universalimageloader.core.display.BitmapDisplayer;
import com.nostra13.universalimageloader.core.display.CircleBitmapDisplayer;
import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;
import com.nostra13.universalimageloader.core.display.RoundedBitmapDisplayer;
import com.nostra13.universalimageloader.core.listener.ImageLoadingListener;
import java.util.ArrayList;
import java.util.List;
public class MyBaseAdafter extends BaseAdapter {
private Context context;
private List<Bean.DataBean>mlist;
public MyBaseAdafter(Context context) {
this.context = context;
mlist = new ArrayList<>();
}
public void setListData(List<Bean.DataBean> list){
this.mlist = list;
notifyDataSetChanged();
}
@Override
public int getCount() {
return mlist.size();
}
@Override
public Bean.DataBean getItem(int position) {
return mlist.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final ViewHoder viewHoder;
if(convertView==null){
convertView = LayoutInflater.from(context).inflate(R.layout.item,parent,false);
viewHoder = new ViewHoder();
viewHoder.textView1 = convertView.findViewById(R.id.textview1);
viewHoder.textView2 = convertView.findViewById(R.id.textview2);
viewHoder.imageView = convertView.findViewById(R.id.imageview);
convertView.setTag(viewHoder);
}else{
viewHoder = (ViewHoder) convertView.getTag();
}
viewHoder.textView1.setText(mlist.get(position).getNews_title());
viewHoder.textView2.setText(mlist.get(position).getNews_summary());
// 1280 * 720 -> 1280 * 720 * 每个像素占用字节数16
//
//RGB_565 red green blue 红绿蓝 的颜色 r占5byte g占6byte b占5byte
//A RGB_4444 A RGB_8888
//ALPHA_8
//BitmapDisplayer
DisplayImageOptions options = new DisplayImageOptions.Builder()
//配置色彩模式
.bitmapConfig(Bitmap.Config.RGB_565)
//配置 是否缓存
.cacheInMemory(true)
.cacheOnDisk(true)
//配置 默认显示
.showImageOnLoading(R.mipmap.ic_launcher)
.showImageOnFail(R.mipmap.ic_launcher)
.showImageForEmptyUri(R.mipmap.ic_launcher)
//配置图片如何缩放
.imageScaleType(ImageScaleType.EXACTLY)
//显示效果:圆形
//.displayer(new CircleBitmapDisplayer())
//圆角
//.displayer(new RoundedBitmapDisplayer(8))
.displayer(new FadeInBitmapDisplayer(2000))
.build();
//加载图片
ImageLoader
.getInstance()
.displayImage(getItem(position).getPic_url(), viewHoder.imageView, options);
//只加载图片
//回调返回bitmap
//ImageLoader.getInstance().loadImage();
return convertView;
}
class ViewHoder{
private TextView textView1,textView2;
private ImageView imageView;
}
}
工具类NetUtil
package com.example.yu.zixun01;
import android.annotation.SuppressLint;
import android.os.AsyncTask;
import com.google.gson.Gson;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
public class NetUtil {
private static NetUtil netUtil;
public static NetUtil getInstance(){
if(netUtil==null){
netUtil=new NetUtil();
}
return netUtil;
}
public interface CallBack<T>{
void onsuccess(T t);
}
@SuppressLint("StaticFieldLeak")
public void getRequest(final String strurl, final Class bean, final CallBack callBack) {
new AsyncTask<String, Void, Object>() {
@Override
protected Object doInBackground(String... strings) {
return getRequest(strurl,bean);
}
@Override
protected void onPostExecute(Object o) {
callBack.onsuccess(o);
}
}.execute(strurl, "");
}
public <T> T getRequest(String urlStr,Class clazz){
return (T) new Gson().fromJson(getRequest(urlStr),clazz);
}
public String getRequest(String strurl){
String result = "";
try {
URL url = new URL(strurl);
HttpURLConnection urlConnection = null;
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.setConnectTimeout(5000);
urlConnection.setReadTimeout(5000);
int responseCode = urlConnection.getResponseCode();
if (responseCode == 200) {
result = stream2String(urlConnection.getInputStream());
}
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
public String stream2String(InputStream inputStream) throws IOException {
StringBuilder sb = new StringBuilder();
BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));
for (String tmp = br.readLine(); tmp != null; tmp = br.readLine()) {
sb.append(tmp);
}
return sb.toString();
}
}
Bean类
package com.example.imageloader;
import java.util.List;
public class Bean {
/**
* status : 1
* info : 获取内容成功
* data : [{"news_id":"13811","news_title":"深港澳台千里连线,嘉年华会今夏入川","news_summary":"6月17\u201420日,\u201c2016成都深港澳台嘉年华会\u201d(简称嘉年华会)将在成都世纪城国际会展中心举办。其主办方励展华博借力旗","pic_url":"http://f.expoon.com/sub/news/2016/01/21/887844_230x162_0.jpg"},]
*/
private List<DataBean> data;
public List<DataBean> getData() {
return data;
}
public void setData(List<DataBean> data) {
this.data = data;
}
public static class DataBean {
/**
* news_id : 13811
* news_title : 深港澳台千里连线,嘉年华会今夏入川
* news_summary : 6月17—20日,“2016成都深港澳台嘉年华会”(简称嘉年华会)将在成都世纪城国际会展中心举办。其主办方励展华博借力旗
* pic_url : http://f.expoon.com/sub/news/2016/01/21/887844_230x162_0.jpg
*/
private String news_title;
private String news_summary;
private String pic_url;
public String getNews_title() {
return news_title;
}
public void setNews_title(String news_title) {
this.news_title = news_title;
}
public String getNews_summary() {
return news_summary;
}
public void setNews_summary(String news_summary) {
this.news_summary = news_summary;
}
public String getPic_url() {
return pic_url;
}
public void setPic_url(String pic_url) {
this.pic_url = pic_url;
}
}
}
App页面
package com.example.imageloader;
import android.app.Application;
import android.os.Environment;
import com.nostra13.universalimageloader.cache.disc.DiskCache;
import com.nostra13.universalimageloader.cache.disc.impl.ext.LruDiskCache;
import com.nostra13.universalimageloader.cache.disc.naming.FileNameGenerator;
import com.nostra13.universalimageloader.cache.disc.naming.HashCodeFileNameGenerator;
import com.nostra13.universalimageloader.cache.memory.MemoryCache;
import com.nostra13.universalimageloader.cache.memory.impl.LruMemoryCache;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.nostra13.universalimageloader.core.assist.QueueProcessingType;
import java.io.IOException;
//优先于所有页面(Activity)创建
//主要负责应用全局初始化
//该对象也是一个context
public class App extends Application {
@Override
public void onCreate() {
super.onCreate();
//ctrl + h 查看累的继承结构
//MemoryCache
//DiskCache
//FileNameGenerator
//怎么调用api
//要什么参数
//怎么给这个参数
//Builder
//构建模式
//链式调用
//全局配置
ImageLoaderConfiguration configuration = null;
DisplayImageOptions options = new DisplayImageOptions.Builder()
.build();
//try {
//
configuration = new ImageLoaderConfiguration.Builder(this)
//配置:内存 磁盘 缓存
//.memoryCache(new LruMemoryCache())
//.memoryCacheSize()
//内存缓存大小
.memoryCacheSizePercentage(10)
//配置磁盘缓存:目录 文件名生成 大小
//.diskCache(new LruDiskCache(getCacheDir(), new HashCodeFileNameGenerator(), 10*1024*1024))
.diskCacheSize(50*1024*1024)
//线程配置
//任务优先级配置
//FIFO
//加载图片1 2 3 4 5
//LIFO
//.tasksProcessingOrder(QueueProcessingType.)
//默认显示配置
//.defaultDisplayImageOptions(options)
.build();
//} catch (IOException e) {
// e.printStackTrace();
//}
//初始化:只有第一次初始化有效果
ImageLoader.getInstance().init(configuration);
//无效果
//ImageLoader.getInstance().init(null);
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.imageloader">
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:name=".App"//注册activity
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
需要第三方jar包 gson , image-loader