使用 Android ShapeDrawable 以编程方式绘制圆

Question

我的项目有一个需求，就是在运行时动态画一个圆。因此，为此我使用 ShapeDrawable 以编程方式创建圆，但不幸的是，我在 ShapeDrawable 中找不到任何 class 或 CircleShape 的方法，而我只找到了 OvalShape()。所以请帮我通过 ShapeDrawable 画一个圆，只需传递圆的直径或半径。提前致谢。任何类型的定制都对我修复我的解决方案很有用。

我为 ShapeDrawable 使用的代码是

public static ShapeDrawable drawCircle (Context context, int width, int height, int color) {

        //////Drawing oval & Circle programmatically /////////////

        ShapeDrawable oval = new ShapeDrawable (new OvalShape ());
        oval.setIntrinsicHeight (height);
        oval.setIntrinsicWidth (width);
        oval.getPaint ().setColor (color);
        return oval;
    }

MainActivity.java

中使用的代码

if(Build.VERSION.SDK_INT >= 16) {
            txtCount.setBackground (Util.drawCircle (MainActivity.this, 50, 50, getResources ().getColor (R.color.yellow)));
            txtHotelCount.setText ("20");
        }else{
            txtCount.setBackgroundDrawable (Util.drawCircle (MainActivity.this, 50, 50, getResources ().getColor (R.color.yellow)));
            txtHotelCount.setText ("20");

        }

xml 在我的项目中使用 TextView txtCount 是

<LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:background="@color/white">

        <TextView
            android:id="@+id/txt_count"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="@color/text_grey"
            android:gravity="center"
            android:textSize="12sp"
            android:padding="2dp"
            />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="@color/text_grey"
            android:text="AVAILABLE"
            android:layout_marginLeft="10dp"
            android:gravity="center"
            />
    </LinearLayout>

但即使设置了与 50 相同的宽度和高度，仍然没有运气。属性仍然表现得像椭圆形。

Answer 1

 // Circle

    Paint paint = new Paint();
    paint.setColor(Color.GREEN);
    paint.setStyle(Paint.Style.STROKE);
    float x = 50;
    float y = 50;
    float radius = 20;
    canvas.drawCircle(x, y, radius, paint);

Answer 2

Give same height and width to your TextView

<TextView
            android:id="@+id/txt_count"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:textColor="@color/text_grey"
            android:gravity="center"
            android:textSize="12sp"
            android:padding="2dp"
            />

Answer 3

现在回答为时已晚，但希望能对其他人有所帮助。如果想画这样的圆圈，就别用46.0%，因为它只是文本视图。

。

public class Circle extends View {

private Paint mCircleYellow;
private Paint mCircleGray;

private float mRadius;
private RectF mArcBounds = new RectF();

public Circle(Context context) {
    super(context);

    // create the Paint and set its color

}

public Circle(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);

    initPaints();
}

public Circle(Context context, AttributeSet attrs) {
    this(context, attrs, 0);
}

private void initPaints() {
    mCircleYellow = new Paint(Paint.ANTI_ALIAS_FLAG);
    mCircleYellow.setStyle(Paint.Style.FILL);
    mCircleYellow.setColor(Color.YELLOW);
    mCircleYellow.setStyle(Paint.Style.STROKE);
    mCircleYellow.setStrokeWidth(15 * getResources().getDisplayMetrics().density);
    mCircleYellow.setStrokeCap(Paint.Cap.SQUARE);
    // mEyeAndMouthPaint.setColor(getResources().getColor(R.color.colorAccent));
    mCircleYellow.setColor(Color.parseColor("#F9A61A"));

    mCircleGray = new Paint(Paint.ANTI_ALIAS_FLAG);
    mCircleGray.setStyle(Paint.Style.FILL);
    mCircleGray.setColor(Color.GRAY);
    mCircleGray.setStyle(Paint.Style.STROKE);
    mCircleGray.setStrokeWidth(15 * getResources().getDisplayMetrics().density);
    mCircleGray.setStrokeCap(Paint.Cap.SQUARE);
    // mEyeAndMouthPaint.setColor(getResources().getColor(R.color.colorAccent));
    mCircleGray.setColor(Color.parseColor("#76787a"));

}

@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);

    mRadius = Math.min(w, h) / 2f;

}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);

    int w = MeasureSpec.getSize(widthMeasureSpec);
    int h = MeasureSpec.getSize(heightMeasureSpec);

    int size = Math.min(w, h);
    setMeasuredDimension(size, size);
}

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    Float drawUpto = 46f;


    float mouthInset = mRadius / 3f;
    mArcBounds.set(mouthInset, mouthInset, mRadius * 2 - mouthInset, mRadius * 2 - mouthInset);
    canvas.drawArc(mArcBounds, 0f, 360f, false, mCircleGray);

    canvas.drawArc(mArcBounds, 270f, drawUpto, false, mCircleYellow);


}

}

所以在你的 xml 文件中使用这个 class 因为它是一个视图 class.

使用 Android ShapeDrawable 以编程方式绘制圆

Drawing Circle programmatically using Android ShapeDrawable

android

android-canvas

android-drawable

xml-drawable

shapedrawable