在Android中制作带有自定义阴影的长椭圆形,可以通过以下步骤实现:
以下是一个示例代码:
public class OvalShadowView extends ImageView {
private Paint mPaint;
private int mShadowColor;
private float mShadowRadius;
private float mShadowDx;
private float mShadowDy;
public OvalShadowView(Context context) {
super(context);
init();
}
public OvalShadowView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public OvalShadowView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
mPaint = new Paint();
mShadowColor = Color.GRAY;
mShadowRadius = 10f;
mShadowDx = 0f;
mShadowDy = 0f;
setLayerType(LAYER_TYPE_SOFTWARE, null); // 开启软件加速,以支持阴影效果
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
int width = getWidth();
int height = getHeight();
// 绘制椭圆形
mPaint.setColor(Color.WHITE);
canvas.drawOval(new RectF(0, 0, width, height), mPaint);
// 绘制阴影
mPaint.setColor(Color.TRANSPARENT);
mPaint.setShadowLayer(mShadowRadius, mShadowDx, mShadowDy, mShadowColor);
canvas.drawOval(new RectF(0, 0, width, height), mPaint);
}
}
在XML布局文件中使用该自定义View:
<com.example.myapplication.OvalShadowView
android:layout_width="200dp"
android:layout_height="100dp"
android:background="@android:color/transparent"
android:elevation="10dp"
android:translationZ="10dp" />
这样就可以在Android中制作带有自定义阴影的长椭圆形了。
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