一行代码实现圆形头像
效果图
在开发APP中,经常要实现圆形头像,那么该如何实现呢?
要裁剪吗,要重写draw函数吗?不用,只用一行代码就可以实现
Glide实现圆形图像
Glide.with(mContext) .load(R.drawable.iv_image_header) .error(R.drawable.ic_error_default) .transform(new GlideCircleTransform(mContext)) .into(mImage);
其中load后为载入的图像,error后为出错时载入的图像,transform是对其修改,我们也是通过这个GlideCirTransForm来修改的,使用的话要把mContext替换为你自己的activty,mImage为图片载入的位置
使用之前的准备
1.添加项目依赖
compile 'org.greenrobot:eventbus:3.0.0' compile 'com.squareup.retrofit2:retrofit:2.0.2' compile 'com.squareup.retrofit2:converter-gson:2.0.2' compile 'com.github.bumptech.glide:glide:3.7.0' compile 'org.jetbrains:annotations-java5:15.0' compile 'in.srain.cube:ultra-ptr:1.0.11' compile 'com.wang.avi:library:1.0.5'
2.导入GlideCircleTransform.java文件
GlideCircleTransform.java代码如下:
package com.sina.weibo.sdk.demo.utils; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapShader; import android.graphics.Canvas; import android.graphics.Paint; import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool; import com.bumptech.glide.load.resource.bitmap.BitmapTransformation; 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; } @Override public String getId() { return getClass().getName(); } }
完成这两步,你就可以使用那行代码完成你自己的圆形头像啦!