Android实现圆形图片效果

本文实例为大家分享了Android实现圆形图片效果的具体代码,供大家参考,具体内容如下

创建RoundPicture.java文件

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

写入RoundPicture.java文件

复制下方代码,并引入类即可

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();

}

// 绘制圆形图片

@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);

}

}

// 获取圆形图片方法

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;

}

}

调用RoundPicture创建圆形图片

只需在.xml文件中插入图片处,将控件名改为

< XX.RoundPicture 并引入图片即可

<com.example.jh_android.RoundPicture

android:id="@+id/iv"

android:layout_height="200dp"

android:layout_width="200dp"

android:layout_marginTop="150dp"

android:layout_centerHorizontal="true"

android:src="@drawable/head"

/>

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。

以上是 Android实现圆形图片效果 的全部内容, 来源链接: utcz.com/p/243708.html

回到顶部