Android自定义视图可以'；不要使用alignParentButton或wrap\u内容

我有一个我不知道如何解决的问题。我已经创建了一个自定义视图，并希望将其与相对布局中的parrent buttom对齐，但当我这样做时，视图变得透明了？！这怎么可能？ 另外，如果我设置了“周围视图布局”\u height=wrap\u content，它将填充整个屏幕。我如何配置它，不这样做，而只是包装内容

这是我的自定义视图

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Shader;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.RelativeLayout;

public class HomeMenuBackground extends View
{ 
    private int mScreenWidth;
    private int mScreenHeight;
    private RectF mSpace;
    private RectF mSpaceStroke;
    private Paint mPaint;
    private Paint mPaintStroke;
    private Rect mRect; 
    private LinearGradient mGradient;

    public HomeMenuBackground(Context context, AttributeSet attrs)
    {
        super(context, attrs);

        mScreenWidth = context.getResources().getDisplayMetrics().widthPixels;
        mScreenHeight = context.getResources().getDisplayMetrics().heightPixels;
        final int mHeighMenu = (int) (mScreenHeight*0.8);
        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mSpace = new RectF(-20, 2, mScreenWidth + 20, 148);
        mSpaceStroke = new RectF(-22, 0, mScreenWidth + 22, 150);
        mRect = new Rect();

        mPaintStroke = new Paint();
        mPaintStroke.setStyle(Paint.Style.STROKE);
        mPaintStroke.setStrokeCap(Paint.Cap.ROUND);
        mPaintStroke.setStrokeWidth(2);
        mPaintStroke.setColor(Color.BLACK);
        mPaintStroke = new Paint(Paint.ANTI_ALIAS_FLAG);

    }

    @Override
    public void onDraw(Canvas canvas)
    {       
        mRect.set(0, 75, canvas.getWidth(), canvas.getHeight());
        canvas.drawArc(mSpaceStroke, 180, 360, true, mPaintStroke);
        canvas.drawArc(mSpace, 180, 360, true, mPaint);
        canvas.drawRect(mRect, mPaint);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) 
    {
        if(mGradient == null)
        {
            mGradient = new LinearGradient(0, 0, 0, MeasureSpec.getSize(heightMeasureSpec), Color.WHITE, Color.GRAY, Shader.TileMode.MIRROR);
            mPaint.setShader(mGradient);
        }

        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }
}

我希望你能帮助我

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BR FireFly3000

要决定自定义视图的高度和宽度，您可以替代该方法，并根据需要提供视图的高度和宽度。我尝试了RelativeLayout，我可以通过使用

setMeasuredDimension（100100）在底部看到高度和宽度为（100100）的布局内部
onMeasure（）
方法。
setMeasuredDimension标记为final，但您可以重写