Android RoundedBitmapDrawable：Android官方的圆角图形图象实现方案

朴灿烈づ我的快乐病毒、 2023-10-17 06:52 12阅读 0赞

**Android RoundedBitmapDrawable：Android官方的圆角图形图象实现方案**

RoundedBitmapDrawable是Android在support v4的扩展包中新增的实现圆角图形的关键类，借助RoundedBitmapDrawable的帮助，可以轻松的以Android标准方式实现圆角图形图象。  
写一个简单的例子。  
写一个线性布局，竖直方向放三个ImageView：

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        tools:context="zhangphil.app.MainActivity">
    
        <ImageView
            android:id="@+id/imageView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp" />
    
        <ImageView
            android:id="@+id/imageView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp" />
    
        <ImageView
            android:id="@+id/imageView3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp" />
    
    </LinearLayout>

然后通过Java代码分别放原始图，圆角图，圆形图作为对比：

package zhangphil.app;
    
    import android.graphics.Bitmap;
    import android.graphics.BitmapFactory;
    import android.support.v4.graphics.drawable.RoundedBitmapDrawable;
    import android.support.v4.graphics.drawable.RoundedBitmapDrawableFactory;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.widget.ImageView;
    
    public class MainActivity extends AppCompatActivity {
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            //未做圆角处理的原始图
            ImageView image1 = (ImageView) findViewById(R.id.imageView1);
            image1.setImageResource(R.drawable.zhangphil);
    
            //圆角图
            RoundedBitmapDrawable roundedDrawable = RoundedBitmapDrawableFactory.create(getResources(), BitmapFactory.decodeResource(getResources(), R.drawable.zhangphil));
            roundedDrawable.getPaint().setAntiAlias(true);
            roundedDrawable.setCornerRadius(30);
            ImageView image2 = (ImageView) findViewById(R.id.imageView2);
            image2.setImageDrawable(roundedDrawable);
    
            //圆形图
            Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.zhangphil);
            RoundedBitmapDrawable circleDrawable = RoundedBitmapDrawableFactory.create(getResources(), BitmapFactory.decodeResource(getResources(), R.drawable.zhangphil));
            circleDrawable.getPaint().setAntiAlias(true);
            circleDrawable.setCornerRadius(Math.max(bitmap.getWidth(), bitmap.getHeight()));
            ImageView image3 = (ImageView) findViewById(R.id.imageView3);
            image3.setImageDrawable(circleDrawable);
        }
    }

代码运行结果：

![Center][]

附录文章：  
1，《Android圆形头像图Circle ImageView》链接地址：[http://blog.csdn.net/zhangphil/article/details/44960551][http_blog.csdn.net_zhangphil_article_details_44960551]  
2，《Android CustomShapeImageView对图片进行各种样式裁剪：圆形、星形、心形、花瓣形等》链接地址：[http://blog.csdn.net/zhangphil/article/details/50119921][http_blog.csdn.net_zhangphil_article_details_50119921]

[Center]: https://img-blog.csdn.net/20160705105745285?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[http_blog.csdn.net_zhangphil_article_details_44960551]: http://blog.csdn.net/zhangphil/article/details/44960551
[http_blog.csdn.net_zhangphil_article_details_50119921]: http://blog.csdn.net/zhangphil/article/details/50119921