简单使用ImageLoader

首先本工程要加一个依赖包 Universal-Image-Loader1：创建MyApplication类继承Application  重写oncreate方法public class MyApplication extends Application {    @Override    public void onCreate() {        super.onCreate();//        默认的ImageLoaderconfiguration  这只会加载图片  而不会又缓存等        ImageLoaderConfiguration configuration = ImageLoaderConfiguration.createDefault(this);        ImageLoader.getInstance().init(configuration);////        自定义的ImageLoaderConfiguration        File file = StorageUtils.getIndividualCacheDirectory(this, Environment.getDownloadCacheDirectory().getPath());        ImageLoaderConfiguration configuration = new ImageLoaderConfiguration.Builder(this)                .threadPoolSize(3)                .memoryCache(new LruMemoryCache(2 * 1024 * 1024))//内存缓存图片 2M                .diskCache(new UnlimitedDiskCache(file))//配饰sdcard缓存路径                .diskCacheSize(50 * 1024 * 1024)// sdcard上缓存50M的图片                .diskCacheFileCount(100)//缓存文件的数量   100个                .diskCacheFileNameGenerator(new Md5FileNameGenerator())                .build();        ImageLoader.getInstance().init(configuration);    }}2：在清单文件注册  在Application里加一个name属性 名字是自定义的Application<manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.bawey.qizepu20170425">    <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"/>    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:name=".MyApplication"        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>3：调用时：在适配器类加载图片，下面是getView方法  public View getView(int position, View convertView, ViewGroup parent) {        if (convertView==null){            convertView=View.inflate(context, R.layout.listview_item,null);        }        ImageView image_1 = (ImageView) convertView.findViewById(R.id.image_1);//        使用默认的ImageLoaderConfiguration//        ImageLoader.getInstance().displayImage(list.get(position).getAlbums().get(0),image_1);//        使用自定义的ImageLoaderConfiguration        ImageLoader.getInstance().displayImage(list.get(position).getAlbums().get(0),image_1,options);        return convertView;    }4：注意：如果用自定义的ImageLoaderConfiguration需要在适配器的构造方法中设置支持缓存private DisplayImageOptions options;public MyListViewAdapter(Context context, List<Foods.ResultBean.DataBean> list) {    this.context=context;    this.list=list;    options=new DisplayImageOptions.Builder()            .cacheInMemory(true)//是否内存缓存            .cacheOnDisk(true)//是否sdcard缓存            .build();//构建图片缓存的选项}适配器详细代码如下public class MyListViewAdapter extends BaseAdapter {    private Context context;    private List<Foods.ResultBean.DataBean> list;    private DisplayImageOptions options;    public MyListViewAdapter(Context context, List<Foods.ResultBean.DataBean> list) {        this.context=context;        this.list=list;        options=new DisplayImageOptions.Builder()                .cacheInMemory(true)//是否内存缓存                .cacheOnDisk(true)//是否sdcard缓存                .build();//构建图片缓存的选项    }    @Override    public int getCount() {        return list.size();    }    @Override    public Object getItem(int position) {        return null;    }    @Override    public long getItemId(int position) {        return 0;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        if (convertView==null){            convertView=View.inflate(context, R.layout.listview_item,null);        }        ImageView image_1 = (ImageView) convertView.findViewById(R.id.image_1);        TextView text_1 = (TextView) convertView.findViewById(R.id.text_1);        text_1.setText(list.get(position).getTitle());//        使用默认的ImageLoaderConfiguration//        ImageLoader.getInstance().displayImage(list.get(position).getAlbums().get(0),image_1);//        使用自定义的ImageLoaderConfiguration        ImageLoader.getInstance().displayImage(list.get(position).getAlbums().get(0),image_1,options);        return convertView;    }}