图片添加文字水印-安卓

export function addWatermark(tempFilePath, gText) {  
        let Resources = plus.android.importClass('android.content.res.Resources')  
    let Bitmap = plus.android.importClass('android.graphics.Bitmap')  
    let BitmapFactory = plus.android.importClass('android.graphics.BitmapFactory')  
    let Canvas = plus.android.importClass('android.graphics.Canvas')  
    let Paint = plus.android.importClass('android.graphics.Paint')  
    let Color = plus.android.importClass('android.graphics.Color')  
    let TextPaint = plus.android.importClass('android.text.TextPaint')  
    let Layout = plus.android.importClass('android.text.Layout')  
    let StaticLayout = plus.android.importClass('android.text.StaticLayout')  
    let BufferedOutputStream = plus.android.importClass('java.io.BufferedOutputStream')  
    let File = plus.android.importClass('java.io.File')  
    let FileOutputStream = plus.android.importClass('java.io.FileOutputStream')  

    let filePath = plus.io.convertLocalFileSystemURL(tempFilePath)  
    let options = new BitmapFactory.Options()  
    options.inPreferredConfig = Bitmap.Config.ARGB_8888;  
    let bitmap = BitmapFactory.decodeFile(filePath, options);  

    // 画图  
    let main =  plus.android.runtimeMainActivity()  
    let application = main.getApplication()  
    let resources =  application.getResources()  
    let displayMetrics = resources.getDisplayMetrics()  
    let scale =  plus.android.getAttribute(displayMetrics, 'density' )   
    let bitmapConfig = bitmap.getConfig();  
    bitmapConfig = Bitmap.Config.ARGB_8888;  
    bitmap = bitmap.copy(bitmapConfig, true);  
    let canvas = new Canvas(bitmap);  
    let paint = new TextPaint(Paint.ANTI_ALIAS_FLAG);  
    // 设置颜色  
    paint.setColor(Color.WHITE);  
    paint.setTextSize((16 * scale));  
    paint.setShadowLayer(1, 0, 1, Color.WHITE);  
    let textWidth = canvas.getWidth() - (16 * scale);  
    // text-align: ALIGN_NORMAL,ALIGN_OPPOSITE,ALIGN_CENTER,ALIGN_LEFT,ALIGN_RIGHT;  
    let textLayout = new StaticLayout(  
        gText, paint, textWidth, Layout.Alignment.ALIGN_CENTER, 1, 0, false);  
    let textHeight = textLayout.getHeight();  
    canvas.save();  
    // 计算画的位置  
    canvas.translate(0, canvas.getHeight() - textHeight);  
    textLayout.draw(canvas);  
    canvas.restore();  
    let file = new File(filePath);  
    let bos = new BufferedOutputStream(new FileOutputStream(file));  
    bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bos);  
    bos.flush();  
    bos.close();  
}  

叠加地址和日期 使用\n可以折行，叠加位置可以自己计算

        addWaterMark(tempFilePath) {  
            return new Promise((resolve, reject) => {  
                uni.getLocation({  
                    geocode: true,  
                    success: ({ address: { city, district, street, streetNum, poiName } }) => {  
                        const address = city + district + street + streetNum + poiName  
                        const date = dayjs().format('YYYY-MM-DD HH:mm')  
                        addWatermark(tempFilePath, `${address}\n${date}`)  
                        resolve(tempFilePath)  
                    }  
                })  
            })  
        }