LIstView多种类+ImageLoader
来源:互联网 发布:人工智能的优点英语 编辑:程序博客网 时间:2024/05/21 06:45
在我们开发Android应用的时候,对于图片,我们总是会遇到许多的问题,比如说:异步加载加载图片、加载大量图片等等。所以为了解决这些问题,很多的开源图片加载框架应运而生,比较著名的就是Universal-Image-Loader:
1.多线程加载图片和显示图片,图片可以来自网络,SD卡,assests文件夹,drawable文件夹;
2.支持图片的内存缓存,SD卡缓存;
3.可以控制图片的加载过程,在经常使用Listview,GridView中,可以设置滑动时暂停加载图片,停止时加载图片(比较省流量);
4.在网络慢的时候,依然可以对图片进行加载;
如果想使用ImageLoader,首先我们需要将jar包导入libs文件夹中,或导入远程依赖:
compile ‘com.nostra13.universalimageloader:universal-image-loader:1.9.5’
而后就需要自己写一个类(MApp)继承Appliction;重写onCreate()方法。然后初始化ImageLoader框架,(在此过程中可以设置自己的参数),如下图:
import android.app.Application;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.QueueProcessingType;
public class MApp extends Application { @Override public void onCreate() { super.onCreate(); //初始化ImageLoader框架 ImageLoaderConfiguration configuration = 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 .threadPoolSize(5)//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 .defaultDisplayImageOptions(DisplayImageOptions.createSimple()) .writeDebugLogs() // Remove for release app.build(); .build();//开始构建 //全局初始化此配置 ImageLoader.getInstance().init(configuration); }}
但是在我们进行联网操作和资源加载的时候需要在清单文件中加入以下的权限:
<uses-permission android:name="android.permission.INTERNET" /><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/><uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
主界面中的代码操作:
import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.ListView;import android.widget.TextView;import com.nostra13.universalimageloader.core.ImageLoader;import java.util.ArrayList;import java.util.List;
public class MainActivity extends AppCompatActivity { private ListView lv; private List<Goods> goodsList; private String imgUrl = "http://image.tianjimedia.com/uploadImages/2012/067/N80N0GUA36N0.jpg"; private ImageLoader instance; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //初始化组件 lv = (ListView) findViewById(R.id.lv); //使用图片框架得到实例 instance = ImageLoader.getInstance(); initData(); } private void initData() { goodsList = new ArrayList<>(); goodsList.add(new Goods("商品3", "23", 0)); goodsList.add(new Goods("商品4", "24", R.drawable.hu, 1)); goodsList.add(new Goods("商品1", "21", 0)); goodsList.add(new Goods("商品2", "22", R.drawable.hu, 1)); goodsList.add(new Goods("商品5", "25", 0)); goodsList.add(new Goods("商品6", "26", R.drawable.hu, 1)); goodsList.add(new Goods("商品21", "21", 0)); goodsList.add(new Goods("商品5", "25", 0)); goodsList.add(new Goods("商品22", "22", R.drawable.hu, 1)); goodsList.add(new Goods("商品23", "23", 0)); goodsList.add(new Goods("商品24", "24", R.drawable.hu, 1)); goodsList.add(new Goods("商品25", "25", 0)); goodsList.add(new Goods("商品26", "26", R.drawable.hu, 1)); goodsList.add(new Goods("商品31", "21", 0)); goodsList.add(new Goods("商品32", "22", R.drawable.hu, 1)); goodsList.add(new Goods("商品34", "24", R.drawable.hu, 1)); goodsList.add(new Goods("商品36", "26", R.drawable.hu, 1)); goodsList.add(new Goods("商品33", "23", 0)); //listview设置适配器 lv.setAdapter(new MyAdapter()); } class MyAdapter extends BaseAdapter { private final int TYPE0 = 0;//只有文字条目 private final int TYPE1 = 1;//文字+图片条目 @Override public int getCount() { return goodsList.size(); } @Override public Object getItem(int i) { return goodsList.get(i); } @Override public long getItemId(int i) { return i; } //返回条目种类的数量 @Override public int getViewTypeCount() { return 2; } //返回条目类型 @Override public int getItemViewType(int position) { return goodsList.get(position).getTypeId(); } //优化 @Override public View getView(int i, View view, ViewGroup viewGroup) { int type = getItemViewType(i); Log.e("TAG",i+""); ViewHolder0 holder0; ViewHolder1 holder1; switch (type) { case TYPE0: if (view == null) { view = View.inflate(MainActivity.this, R.layout.item0, null); holder0 = new ViewHolder0(); holder0.tv1 = view.findViewById(R.id.textView1); holder0.tv2 = view.findViewById(R.id.textView2); view.setTag(holder0); } else { holder0 = (ViewHolder0) view.getTag(); } holder0.tv1.setText(goodsList.get(i).getName()); holder0.tv2.setText(goodsList.get(i).getPrice()); break; case TYPE1: if (view == null) { view = View.inflate(MainActivity.this, R.layout.item1, null); holder1 = new ViewHolder1(); holder1.tv1 = view.findViewById(R.id.textView1); holder1.tv2 = view.findViewById(R.id.textView2); holder1.imageView = view.findViewById(R.id.imageView1); view.setTag(holder1); } else { holder1 = (ViewHolder1) view.getTag(); } holder1.tv1.setText(goodsList.get(i).getName()); holder1.tv2.setText(goodsList.get(i).getPrice()); //请求网络图片,并显示在控件上 instance.displayImage(imgUrl, holder1.imageView); break; } return view; } } class ViewHolder0 { TextView tv1, tv2; } class ViewHolder1 { TextView tv1, tv2; ImageView imageView; }}
bean类:
public class Goods { private String name; private String price; private int resId; private int typeId; public Goods(String name, String price, int typeId) { this.name = name; this.price = price; this.typeId = typeId; } public Goods(String name, String price, int resId, int typeId) { this.name = name; this.price = price; this.resId = resId; this.typeId = typeId; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPrice() { return price; } public void setPrice(String price) { this.price = price; } public int getResId() { return resId; } public void setResId(int resId) { this.resId = resId; } public int getTypeId() { return typeId; } public void setTypeId(int typeId) { this.typeId = typeId; }}
主界面的布局:
<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.bwie.listtype_imageloader.MainActivity"> <ListView android:id="@+id/lv" android:layout_width="match_parent" android:layout_height="match_parent"></ListView></android.support.constraint.ConstraintLayout>
文字界面的布局:
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:textSize="24sp" android:text="TextView" /> <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:textSize="24sp" android:text="TextView" /></LinearLayout>
文字+图片布局:
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:textSize="24sp" android:text="TextView" /> <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:textSize="24sp" android:text="TextView" /> <ImageView android:id="@+id/imageView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@mipmap/ic_launcher" /></LinearLayout>
阅读全文
0 0
- LIstView多种类+ImageLoader
- Imageloader listview
- ListView多条目+ImageLoader
- Imageloader简单展示Listview
- ImageLoader加载ListView GridView ViewPager
- ImageLoader类
- listview多种形式item
- 多种布局的ListView
- ListView的多种ViewType
- listView中多种布局
- ListView实现多种布局
- ListView多种条目显示
- Android新闻类界面分享(多种布局的listview)
- Universal ImageLoader 在ListView刷新时会闪动
- ImageLoader进阶(结合ListView、ViewPager使用)
- Imageloader, listview.notifyDataSetChanged刷新问题,图片闪烁
- Universal ImageLoader 在ListView刷新时会闪动
- ListView之ImageLoader实现图片加载
- element-ui的分页el-pagination的坑,
- 微信小程序 全站开发 thinkPHP 5.0+小程序商城
- Ubuntu 16.04 安装遇到"System program problem detected"解决方案
- 习题 7.13 用递归方法求n阶勒让德多项式的值,递归公式为:
- [RK3288][Android5.1] 移植笔记 --- gsl3673 触控驱动
- LIstView多种类+ImageLoader
- Android Library上传到GitHub并一键发布到Bintray或JCenter
- 【优化】共轭函数(Conjugate Function)超简说明
- 如何下载Linux软件源码
- plsql修改表信息问题
- 推荐最新的Asp.Net Core 下开源的AOP框架 AspectCore
- k均值聚类算法
- <c:forEach>终止循环
- elasticsearch多级聚合查询