工具类之 ImageLoader（基于 Glide）

/**

• 类描述：图片处理工具类的封装（基于 Glide）

*/

public class ImageLoader {

private Context mContext;

public static final String ANDROID_RESOURCE = "android.resource://";

public static final String FOREWARD_SLASH = "/";

public ImageLoader(Context context) {

this.mContext = context;

}

// 将资源 ID 转为 Uri

public Uri resourceIdToUri(int resourceId) {

return Uri.parse(ANDROID_RESOURCE + mContext.getPackageName() + FOREWARD_SLASH + resourceId);

}

// 加载访问地址的图片

public void loadUrlImage(String url, int loadResId, ImageView imageView) {

with(mContext)

.load(url)

.placeholder(loadResId)

.error(loadResId)

.crossFade()

.into(imageView);

}

// 加载 drawable 图片

public void loadResImage(int resId, int loadResId, ImageView imageView) {

with(mContext)

.load(resourceIdToUri(resId))

.placeholder(loadResId)

.error(loadResId)

.crossFade()

.into(imageView);

}

// 加载本地图片

public void loadLocalImage(String path, int loadResId, ImageView imageView) {

with(mContext)

.load("file://" + path)

.placeholde

《Android学习笔记总结+最新移动架构视频+大厂安卓面试真题+项目实战源码讲义》
浏览器打开：qq.cn.hn/FTe 免费领取

r(loadResId)

.error(loadResId)

.crossFade()

.into(imageView);

}

/****************************

• 圆形图片

***************************************/

// 加载有访问地址的圆型图片

public void loadCircleImage(String url, int loadResId, ImageView imageView) {

with(mContext)

.load(url)

.placeholder(loadResId)

.error(loadResId)

.crossFade()

.transform(new GlideCircleTransform(mContext))

.into(imageView);

}

// 加载 drawable 圆型图片

public void loadCircleResImage(int resId, int loadResId, ImageView imageView) {

with(mContext)

.load(resourceIdToUri(resId))

.placeholder(loadResId)

.error(loadResId)

.crossFade()

.transform(new GlideCircleTransform(mContext))

.into(imageView);

}

// 加载本地圆型图片

public void loadCircleLocalImage(String path, int loadResId, ImageView imageView) {

with(mContext)

.load("file://" + path)

.placeholder(loadResId)

.error(loadResId)

.crossFade()

.transform(new GlideCircleTransform(mContext))

.into(imageView);

}

/****************************

• 圆角型图片

***************************************/

// 加载有访问地址的圆角型图片

public void loadRoundImage(String url, int loadResId, ImageView imageView) {

with(mContext)

.load(url)

.placeholder(loadResId)

.error(loadResId)

.crossFade()

.transform(new GlideRoundTransform(mContext,

DisplayUtil.dip2px(mContext, 2.0f)))

.into(imageView);

}

// 加载 drawable 圆角型图片

public void loadRoundResImage(int resId, int loadResId, ImageView imageView) {

with(mContext)

.load(resourceIdToUri(resId))

.placeholder(loadResId)

.error(loadResId)

.crossFade()

.transform(new GlideRoundTransform(mContext,

DisplayUtil.dip2px(mContext, 2.0f)))

.into(imageView);

}

// 加载本地圆角型图片

public void loadRoundLocalImage(String path, int loadResId, ImageView imageView) {

with(mContext)

.load("file://" + path)

.placeholder(loadResId)

.error(loadResId)

.crossFade()

.transform(new GlideRoundTransform(mContext, DisplayUtil.dip2px(mContext, 2.0f)))

.into(imageView);

}

}

3、GlideCircleTransform

======================

/**

• 类描述：基于 Glide 图片圆型变换类

*/

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;

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;

}