XML android中底部为圆形的背景图像

我想在线性布局的背景中添加一个图像，我知道该属性将是android:background=“@drawable/login_bg”，但现在我必须创建一个可绘制的资源文件，在该文件中，我希望左下方和右下方为圆形，左上方和右上方为矩形。 记住：我需要一个圆角背景内的图像

我试过这个

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尝试使用此自定义视图。但您必须从android:background更改为android:src

class RadiusImageView: AppCompatImageView {

private val clipPath = Path()

constructor(context: Context) : super(context) {}

constructor(context: Context, attrs: AttributeSet) : super(context, attrs) {}

constructor(context: Context, attrs: AttributeSet, defStyle: Int) : super(context, attrs, defStyle) {}

override fun onDraw(canvas: Canvas) {
    //float radius = 36.0f;

    val rect = RectF(0f, 0f, width.toFloat(), height.toFloat())

    // 4 Pair of radius : top-left, top -right, bottom-right, bottom left, each pair is radius 
    // for rx and ry for each corner
    clipPath.addRoundRect(rect, floatArrayOf(0f,0f,0f,0f,40f,40f,40f,40f) Path.Direction.CW)

    canvas.clipPath(clipPath)

    super.onDraw(canvas)
}

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}

我找到了一个解决方案，我用以下方法解决了这个问题： 我正在编写onCreate方法的一部分

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);
    topbackground=(ImageView) findViewById(R.id.topbackground);
 Bitmap image1 = BitmapFactory.decodeResource(getResources(),R.drawable.login_bg)
 topbackground.setImageBitmap(roundedImage.getRoundedCornerBitmap(this,
 image1,200,image1.getWidth(),image1.getHeight(),true,true,false,false ));
 }
 RoundedImage roundedImage = new RoundedImage();

有一个名为“login_bg”的图像，“topbackground”是图像的视图，我正在调用一个名为“RoundeImage”的单独类，并通过传递其参数来执行此操作，我的类RoundeImage如下所示：

 public class RoundedImage  {




   public static Bitmap getRoundedCornerBitmap(Context context, Bitmap input, int 
   pixels , int w , int h , boolean squareTL, boolean squareTR, boolean squareBL, 
   boolean squareBR  ) {

    Bitmap output = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(output);
    final float densityMultiplier = 
    context.getResources().getDisplayMetrics().density;

    final int color = 0xff424242;
    final Paint paint = new Paint();
    final Rect rect = new Rect(0, 0, w, h);
    final RectF rectF = new RectF(rect);

    //make sure that our rounded corner is scaled appropriately
    final float roundPx = pixels*densityMultiplier;

    paint.setAntiAlias(true);
    canvas.drawARGB(0, 0, 0, 0);
    paint.setColor(color);
    canvas.drawRoundRect(rectF, roundPx, roundPx, paint);


    //draw rectangles over the corners we want to be square
    if (squareTL ){
        canvas.drawRect(0, 0, w/2, h/2, paint);
    }
    if (squareTR ){
        canvas.drawRect(w/2, 0, w, h/2, paint);
    }
    if (squareBL ){
        canvas.drawRect(0, h/2, w/2, h, paint);
    }
    if (squareBR ){
        canvas.drawRect(w/2, h/2, w, h, paint);
    }

    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
    canvas.drawBitmap(input, 0,0, paint);

    return output;
    }
  }

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这就是它的运行方式，我能够得到所需要的。

希望这个答案对@ViduraPrasangana有帮助@ViduraPrasangana我已经阅读了这篇文章，我在我的项目中创建了这个类，现在如何将它与XML文件集成。你可以尝试更改

项

s的顺序吗？签出这个@paritoshurohit你能发布一张图片吗你想实现什么？没有这么复杂！你可以简单地使用xml@HelloWorld这在我的情况下不起作用，我不会记下你的答案，无论如何，谢谢！

 public class RoundedImage  {




   public static Bitmap getRoundedCornerBitmap(Context context, Bitmap input, int 
   pixels , int w , int h , boolean squareTL, boolean squareTR, boolean squareBL, 
   boolean squareBR  ) {

    Bitmap output = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(output);
    final float densityMultiplier = 
    context.getResources().getDisplayMetrics().density;

    final int color = 0xff424242;
    final Paint paint = new Paint();
    final Rect rect = new Rect(0, 0, w, h);
    final RectF rectF = new RectF(rect);

    //make sure that our rounded corner is scaled appropriately
    final float roundPx = pixels*densityMultiplier;

    paint.setAntiAlias(true);
    canvas.drawARGB(0, 0, 0, 0);
    paint.setColor(color);
    canvas.drawRoundRect(rectF, roundPx, roundPx, paint);


    //draw rectangles over the corners we want to be square
    if (squareTL ){
        canvas.drawRect(0, 0, w/2, h/2, paint);
    }
    if (squareTR ){
        canvas.drawRect(w/2, 0, w, h/2, paint);
    }
    if (squareBL ){
        canvas.drawRect(0, h/2, w/2, h, paint);
    }
    if (squareBR ){
        canvas.drawRect(w/2, h/2, w, h, paint);
    }

    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
    canvas.drawBitmap(input, 0,0, paint);

    return output;
    }
  }