Android 实现圆角图片的简单实例

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);