Question

我想在线性布局的背景中添加一个图像，并且我知道该属性将为android：background =“ @ drawable / login_bg”，但是现在我必须创建一个可绘制的资源文件，在该文件中，我想要左下和右下角是圆角的，左上和右上角是矩形。记住：我需要在背景内带有圆角的图像。

我已经尝试过link

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

 <item>
        <shape android:shape="rectangle" android:padding="10dp">
            <corners
                android:bottomRightRadius="15dp"
                android:bottomLeftRadius="15dp"
                android:topLeftRadius="0dp"
                android:topRightRadius="0dp"/>
        </shape>
    </item>
    <item android:drawable="@drawable/login_bg" />
</layer-list>

Answer 1

尝试使用此customview。但是您必须从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)
}

}

Answer 2

我得到了一个解决方案，我通过以下方式做到了这一点：我正在写我的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();

有一幅名为“ login_bg”的图像，“ topbackground”是Image的视图，我正在调用一个名为“ RoundedImage”的单独的类，并通过传递其参数来执行此操作，而我的RoundedImage类如下所示：

 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;
    }
  }

事情就是这样，我能够得到需要的东西。

XML android中带有圆形底部的背景图片

2 个答案: