android中创建带数字的自定义bitmap

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在开发中可能需要用到一些带数字的drawable图片，比如从0-99，此时让UI挨个给图，就很没有必要了。资源文件也会爆棚。

此时就需要我们用代码自定义drawable图片来。先看效果：

上代码：

package com.everbridge.xxx.util;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.RectF;/** * Created by maple on 16/11/14. */public class BitmapUtils {    public static Bitmap getNumberBitmap(int iconSize, String number) {        return getNumberBitmap(iconSize, iconSize / 10, number);    }    public static Bitmap getNumberBitmap(int iconSize, int padding, String number) {        Bitmap bitmap = Bitmap.createBitmap(iconSize, iconSize, Bitmap.Config.ARGB_8888);        Canvas canvas = new Canvas(bitmap);        RectF rect = new RectF(0, 0, canvas.getWidth(), canvas.getHeight());        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DEV_KERN_TEXT_FLAG);        // draw background        paint.setColor(Color.WHITE);        canvas.drawOval(rect, paint);        paint.setColor(Color.RED);        canvas.drawOval(new RectF(padding, padding, rect.width() - padding, rect.height() - padding), paint);        // draw text        paint.setColor(Color.WHITE);        paint.setStrokeWidth(3);        paint.setTextSize(iconSize * 0.6f);        paint.setTextAlign(Paint.Align.CENTER);        Paint.FontMetricsInt fontMetrics = paint.getFontMetricsInt();        float baseline = (rect.bottom + rect.top - fontMetrics.bottom - fontMetrics.top) / 2;        canvas.drawText(number, rect.centerX(), baseline, paint);        return bitmap;    }}

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