android - 将字符串文本转换为位图

Question

是否可以将 EditText 框中的字符串文本转换为位图？换句话说，有没有办法将字符串文本转换为位图，这意味着文本将显示为图像？

以下是我的代码:

class TextToImage extends Activity {

    protected void onCreate(Bundle savedInstanceState) {
        //create String object to be converted to image
        String sampleText = "SAMPLE TEXT";
        String fileName = "Image";

        //create a File Object
        File newFile = new File("./" + fileName + ".jpeg");

        //create the font you wish to use
        Font font = new Font("Tahoma", Font.PLAIN, 11);

        //create the FontRenderContext object which helps us to measure the text
        FontRenderContext frc = new FontRenderContext(null, true, true);
    }
}

Answer 1

您可以创建一个适当大小的位图，为该位图创建一个 Canvas ，然后在其中绘制您的文本。您可以使用 Paint 对象来测量文本，以便了解位图所需的大小。你可以这样做(未经测试):

public Bitmap textAsBitmap(String text, float textSize, int textColor) {
    Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
    paint.setTextSize(textSize);
    paint.setColor(textColor);
    paint.setTextAlign(Paint.Align.LEFT);
    float baseline = -paint.ascent(); // ascent() is negative
    int width = (int) (paint.measureText(text) + 0.5f); // round
    int height = (int) (baseline + paint.descent() + 0.5f);
    Bitmap image = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(image);
    canvas.drawText(text, 0, baseline, paint);
    return image;
}