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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