Glide 加载圆角、圆形图片

 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2014年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 = "http://img0.bdstatic.com/img/image/shouye/xiaoxiao/%E5%B0%8F%E6%B8%85%E6%96%B0614.jpg";
    ImageView mImgNormal, mImgCircle, mImgRound;

    @Override
    protected 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 2016/6/22.
* 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 too
        Bitmap 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 2016/6/22.
*  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 2016/6/22.
*/
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 API
        Glide.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/2016/02/27/Glide_Getting_Started/

 打完收工，不谢 -_-

尼玛，差点忘贴图：