如何在android的画布中绘制文本[重复]

Question

我正在编写一个包含仪表视图的应用程序。我从here 下载，我想在仪表视图中绘制文本（即在仪表视图的中心）如何在仪表视图中绘制文本请帮助我。

在我的朋友在堆栈溢出中回答后，我这样做了，但它不起作用，请让它起作用

 private void drawGauge() 
    {
        if (null != mBackground) 
        {
           mBackground.recycle();
        }

        /*--For Semi circle put getHeight()/2--*/
        mBackground = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888);
        newBitmap = Bitmap.createBitmap(mBackground.getWidth(), mBackground.getHeight(), Config.ARGB_8888);
        Canvas newCanvas = new Canvas(newBitmap);
        final Canvas canvas = new Canvas(mBackground);
        final float scale = Math.min(getWidth(), getHeight());
        canvas.scale(scale, scale);
        canvas.translate((scale == getHeight()) ? ((getWidth() - scale) / 2) / scale : 0,(scale == getWidth()) ? ((getHeight() - scale) / 2) / scale : 0);

        Paint paintText = new Paint(Paint.ANTI_ALIAS_FLAG);
        paintText.setColor(Color.WHITE);
        paintText.setTextSize(50);
        paintText.setTextAlign(Align.CENTER);
        paintText.setStyle(Style.FILL);
        Rect rectText = new Rect();
        paintText.getTextBounds(captionString, 0, captionString.length(), rectText);
        newCanvas.drawText(captionString, 0, rectText.height(), paintText);


        //canvas.drawText("MedeQuip", 200, 500, shadowpaint);
        //drawRim(canvas);
        //drawFace(canvas);

对于 vipluv：

 protected void onDraw(final Canvas canvas) {
        drawBackground(canvas);
        final float scale = Math.min(getWidth(), getHeight());
        canvas.scale(scale, scale);
        canvas.translate((scale == getHeight()) ? ((getWidth() - scale) / 2) / scale : 0, (scale == getWidth()) ? ((getHeight() - scale) / 2) / scale : 0);

        if (mShowNeedle) {
            drawNeedle(canvas);
        }

        if (mShowText) {
            drawText(canvas);
        }

        Paint paintText = new Paint(Paint.ANTI_ALIAS_FLAG);
        paintText.setColor(Color.WHITE);
        paintText.setTextSize(150);
        paintText.setTextAlign(Align.CENTER);
        paintText.setStyle(Style.FILL);
        Rect rectText = new Rect();
        paintText.getTextBounds(captionString, 0, captionString.length(), rectText);
        canvas.drawText(captionString, rectText.width(), rectText.height(), paintText);

        computeCurrentValue();
    }

Answer 1

在 GaugeView.java 文件的 onDraw() 函数中，在调用 computeCurrentValue() 之前添加一个 canvas.drawText()。

使用您自己的 Paint 对象，并确保您已初始化其 textsize 和 color 属性。