ImageLoader_mainctivity

"清单文件中"--->
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>
三个权限和在
application  标签下配置  
android:name=".Applications"
 public class MainActivity extends AppCompatActivity {


    private ImageView img;    String[] images = {            "https://img-my.csdn.net/uploads/201407/26/1406383264_8243.jpg",            "https://img-my.csdn.net/uploads/201407/26/1406383248_3693.jpg",            "https://img-my.csdn.net/uploads/201407/26/1406383243_5120.jpg",            "https://img-my.csdn.net/uploads/201407/26/1406383242_3127.jpg",            "https://img-my.csdn.net/uploads/201407/26/1406383242_9576.jpg",            "https://img-my.csdn.net/uploads/201407/26/1406383242_1721.jpg",            "https://img-my.csdn.net/uploads/201407/26/1406383219_5806.jpg",            "https://img-my.csdn.net/uploads/201407/26/1406383214_7794.jpg",            "https://img-my.csdn.net/uploads/201407/26/1406383213_4418.jpg",            "https://img-my.csdn.net/uploads/201407/26/1406383213_3557.jpg",            "https://img-my.csdn.net/uploads/201407/26/1406383210_8779.jpg",            "https://img-my.csdn.net/uploads/201407/26/1406383172_4577.jpg",            "https://img-my.csdn.net/uploads/201407/26/1406383166_3407.jpg",            "https://img-my.csdn.net/uploads/201407/26/1406383166_2224.jpg"    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        img = (ImageView) findViewById(R.id.imageView);        //d得到imageLoaderde 的实例        ImageLoader imageLoader = ImageLoader.getInstance();        new DisplayImageOptions.Builder()                //设置鱼片在下载期间显示的图片                .showImageOnLoading(R.mipmap.ic_launcher)                //设置图片url路径为空或错误的时候                .showImageForEmptyUri(R.mipmap.ic_launcher)                //设置图片加载/解码过程中错误时候显示的图片                .showImageOnFail(R.mipmap.ic_launcher)                /*                *  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//                    .decodingOptions(android.graphics.BitmapFactory.Options decodingOptions)//设置图片的解码配置                    //.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();/                * */                .build();        imageLoader.displayImage(images[2], img);    }}