Android 实现圆角图片的简单实例

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'

<android.support.v7.widget.CardView
  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"

  >
  <ImageView
    android:id="@+id/iv_subject"
    android:gravity="center"
    android:scaleType="centerCrop"
    android:layout_width="match_parent"
    android:layout_height="200dp" />

  <TextView
    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" />

</android.support.v7.widget.CardView>

 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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