谷歌开发者论坛上，谷歌为我们介绍了一个名叫 Glide 的图片加载库，作者是bumptech。这个库被广泛的运用在google的开源项目中，包括google I/O大会上发布的官方app。我们直接实战（不扯淡）：1、引入库：
compile 'com.github.bumptech.glide:glide:3.6.1'
2、演示代码：
public class MainActivity extends AppCompatActivity {String url = "/img/image/shouye/xiaoxiao/%E5%B0%8F%E6%B8%85%E6%96%B0614.jpg";ImageView mImgNormal, mImgCircle, mImgRound;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mImgNormal = (ImageView) findViewById(R.id.img_normal);mImgCircle = (ImageView) findViewById(R.id.img_circle);mImgRound = (ImageView) findViewById(R.id.img_round);GlideImgManager.glideLoader(this, url, R.mipmap.ic_launcher, R.mipmap.ic_launcher, mImgNormal);GlideImgManager.glideLoader(this, url, R.mipmap.ic_launcher, R.mipmap.ic_launcher, mImgCircle, 0);GlideImgManager.glideLoader(this, url, R.mipmap.ic_launcher, R.mipmap.ic_launcher, mImgRound, 1);}
3、CircleImage工具类:
/*** Created by qly on /6/22.* 将图片转化为圆形*/public class GlideCircleTransform extends BitmapTransformation {public GlideCircleTransform(Context context) {super(context);}@Override protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {return circleCrop(pool, toTransform);}private static Bitmap circleCrop(BitmapPool pool, Bitmap source) {if (source == null) return null;int size = Math.min(source.getWidth(), source.getHeight());int x = (source.getWidth() - size) / 2;int y = (source.getHeight() - size) / 2;// TODO this could be acquired from the pool tooBitmap squared = Bitmap.createBitmap(source, x, y, size, size);Bitmap result = pool.get(size, size, Bitmap.Config.ARGB_8888);if (result == null) {result = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);}Canvas canvas = new Canvas(result);Paint paint = new Paint();paint.setShader(new BitmapShader(squared, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));paint.setAntiAlias(true);float r = size / 2f;canvas.drawCircle(r, r, r, paint);return result;}@Override public String getId() {return getClass().getName();}}
4、RoundImage工具类：
/*** Created by qly on /6/22.* 将图片转化为圆角* 构造中第二个参数定义半径*/public class GlideRoundTransform extends BitmapTransformation {private static float radius = 0f;public GlideRoundTransform(Context context) {this(context, 4);}public GlideRoundTransform(Context context, int dp) {super(context);this.radius = Resources.getSystem().getDisplayMetrics().density * dp;}@Override protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {return roundCrop(pool, toTransform);}private static Bitmap roundCrop(BitmapPool pool, Bitmap source) {if (source == null) return null;Bitmap result = pool.get(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);if (result == null) {result = Bitmap.createBitmap(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);}Canvas canvas = new Canvas(result);Paint paint = new Paint();paint.setShader(new BitmapShader(source, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));paint.setAntiAlias(true);RectF rectF = new RectF(0f, 0f, source.getWidth(), source.getHeight());canvas.drawRoundRect(rectF, radius, radius, paint);return result;}@Override public String getId() {return getClass().getName() + Math.round(radius);}}
5、操作工具类：
/*** Created by QLY on /6/22.*/public class GlideImgManager {/*** load normal for img** @param url* @param erroImg* @param emptyImg* @param iv*/public static void glideLoader(Context context,String url, int erroImg, int emptyImg, ImageView iv) {//原生 APIGlide.with(context).load(url).placeholder(emptyImg).error(erroImg).into(iv);}/*** load normal for circle or round img** @param url* @param erroImg* @param emptyImg* @param iv* @param tag*/public static void glideLoader(Context context, String url, int erroImg, int emptyImg, ImageView iv, int tag) {if (0 == tag) {Glide.with(context).load(url).placeholder(emptyImg).error(erroImg).transform(new GlideCircleTransform(context)).into(iv);} else if (1 == tag) {Glide.with(context).load(url).placeholder(emptyImg).error(erroImg).transform(new GlideRoundTransform(context,10)).into(iv);}}}
Glide教程：http://mrfu.me//02/27/Glide_Getting_Started/打完收工，不谢 -_-
尼玛，差点忘贴图：
