Android(安卓)圆角图片的实现

Android 圆角图片

效果图：

快速开始

activity_main.xml文件。

<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity">    <ImageView        android:id="@+id/iv_img"        android:layout_width="300dp"        android:layout_height="200dp"        android:layout_marginTop="30dp"        android:src="@mipmap/image_bg"        app:layout_constraintRight_toRightOf="parent"        app:layout_constraintLeft_toLeftOf="parent"        app:layout_constraintTop_toTopOf="parent"/>    <ImageView        android:id="@+id/iv_rect_img"        android:layout_width="300dp"        android:layout_height="200dp"        android:layout_marginTop="30dp"        app:layout_constraintRight_toRightOf="parent"        app:layout_constraintLeft_toLeftOf="parent"        app:layout_constraintTop_toBottomOf="@id/iv_img"/>    <ImageView        android:id="@+id/iv_circle_img"        android:layout_width="200dp"        android:layout_height="200dp"        android:layout_marginTop="30dp"        app:layout_constraintLeft_toLeftOf="parent"        app:layout_constraintRight_toRightOf="parent"        app:layout_constraintTop_toBottomOf="@id/iv_rect_img"/></android.support.constraint.ConstraintLayout>

MainActivity.class文件。

public class MainActivity extends AppCompatActivity {    private ImageView ivRectImg, ivCircleImg;    private Bitmap bitmap;    private int width;    private int height;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ivRectImg = findViewById(R.id.iv_rect_img);        ivCircleImg = findViewById(R.id.iv_circle_img);        bitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.image_bg);        width = bitmap.getWidth();        height = bitmap.getHeight();        rectRoundBitmap();        circleBitmap();    }// 圆角矩形    private void rectRoundBitmap() {        RoundedBitmapDrawable bitmapDrawable = RoundedBitmapDrawableFactory.create(getResources(), bitmap);        bitmapDrawable.setAntiAlias(true);        bitmapDrawable.setCornerRadius(50);        ivRectImg.setImageDrawable(bitmapDrawable);    }    // 把bitmap图片进行剪切成正方形， 然后再设置圆角半径为正方形边长的一半即可    private void circleBitmap() {        Bitmap circle = null;        int min = Math.min(width, height);        int max = Math.max(width, height);        if (width == height) {            circle = Bitmap.createBitmap(bitmap, 0, 0, width, height);        } else {            // 居中裁剪            if (width > height) {                circle = Bitmap.createBitmap(bitmap, (max - min) / 2, 0, min, min);            } else {                circle = Bitmap.createBitmap(bitmap, 0, (max - min) / 2, min, min);            }        }        RoundedBitmapDrawable bitmapDrawable = RoundedBitmapDrawableFactory.create(getResources(), circle);        bitmapDrawable.setCornerRadius(min / 2);        bitmapDrawable.setAntiAlias(true);        ivCircleImg.setImageDrawable(bitmapDrawable);    }}

Android 圆角图片

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