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Android 实现圆角图片的简单实例
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实现效果图:
本来想在网上找个圆角的例子看一看,不尽人意啊,基本都是官方的Demo的那张原理图,稍后会贴出。于是自己自定义了个View,实现图片的圆角以及圆形效果。效果图:
Android 圆角图片的实现形式,包括用第三方、也有系统的。比如makeramen:roundedimageview,系统的cardview , glide .fresco 。
compile 'com.android.support:appcompat-v7:24.0.0' compile 'com.makeramen:roundedimageview:2.2.1' compile 'com.android.support:cardview-v7:24.0.0' compile 'com.github.bumptech.glide:glide:3.7.0' compile 'com.facebook.fresco:fresco:0.12.0'
iv_round=(RoundedImageView) findViewById(R.id.iv_round); Glide.with(this).load(url).into(iv_round);
iv_cardview=(ImageView)findViewById(R.id.iv_cardview); Glide.with(this).load(url).into(iv_cardview);
iv_fresco=(SimpleDraweeView)findViewById(R.id.iv_fresco); Glide.with(this).load(url).into(iv_round); Glide.with(this).load(url).into(iv_cardview); Uri uri = Uri.parse(url); iv_fresco.setImageURI(uri);
package roundimageview.forezp.com.roundimageview; import android.content.Context; import android.content.res.Resources; import android.graphics.Bitmap; import android.graphics.BitmapShader; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.RectF; import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool; import com.bumptech.glide.load.resource.bitmap.BitmapTransformation; /** * Created by Administrator on 2016/8/19 0019. */ 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); } }
Glide.with(this).load(url).transform(new GlideRoundTransform(this,6)).into(iv_glide);
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