Android實現圓形圖片效果

本文實例為大家分享了Android實現圓形圖片效果的具體代碼，供大家參考，具體內容如下

創建RoundPicture.java文件

在src/main/java/XX包下新建RoundPicture.java

寫入RoundPicture.java文件

復制下方代碼，并引入類即可

public class RoundPicture extends androidx.appcompat.widget.AppCompatImageView { private Paint paint; public RoundPicture(Context context) {this(context, null); } public RoundPicture(Context context, AttributeSet attrs) {this(context, attrs, 0); } public RoundPicture(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);paint = new Paint(); }// 繪制圓形圖片 @Override protected void onDraw(Canvas canvas) {Drawable drawable = getDrawable();if (null != drawable) { Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap(); Bitmap b = getCircleBitmap(bitmap, 14); final Rect rectSrc = new Rect(0, 0, b.getWidth(), b.getHeight()); final Rect rectDest = new Rect(0, 0, getWidth(), getHeight()); paint.reset(); canvas.drawBitmap(b, rectSrc, rectDest, paint);} else { super.onDraw(canvas);} }// 獲取圓形圖片方法 private Bitmap getCircleBitmap(Bitmap bitmap, int pixels) {Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);Canvas canvas = new Canvas(output);final int color = 0xff424242;final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());paint.setAntiAlias(true);canvas.drawARGB(0, 0, 0, 0);paint.setColor(color);int x = bitmap.getWidth();canvas.drawCircle(x / 2, x / 2, x / 2, paint);paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));canvas.drawBitmap(bitmap, rect, rect, paint);return output; }}

調用RoundPicture創建圓形圖片

只需在.xml文件中插入圖片處，將控件名改為< XX.RoundPicture 并引入圖片即可

<com.example.jh_android.RoundPicture android: android:layout_height='200dp' android:layout_width='200dp' android:layout_marginTop='150dp' android:layout_centerHorizontal='true' android:src='http://www.wxshucaidpc.com/bcjs/@drawable/head' />

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持好吧啦網。