Android 实现圆角图片的简单实例

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'

xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

android:id="@+id/id_cardview"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_gravity="center_horizontal"

app:cardBackgroundColor="@color/bg_light_gray"

app:cardCornerRadius="3dp"

app:cardUseCompatPadding="false"

app:cardPreventCornerOverlap="true"

>

android:id="@+id/iv_subject"

android:gravity="center"

android:scaleType="centerCrop"

android:layout_width="match_parent"

android:layout_height="200dp" />

android:paddingLeft="5dp"

android:paddingBottom="5dp"

android:background="@drawable/bg_biaoti"

android:id="@+id/tv_subject"

android:gravity="center_vertical"

android:text=""

android:ellipsize="end"

android:singleLine="true"

android:textSize="13sp"

android:textColor="@color/white"

android:layout_gravity="bottom"

android:layout_width="match_parent"

android:layout_height="wrap_content" />

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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