Android实现生成二维码并保存到相册

private val mBitmapUrl = "wwwww://WL3687211525992373----"

private lateinit var mBitmap: Bitmap

lifecycleScope.launch {
val qrcodeBitmap = QRCodeEncoder.syncEncodeQRCode(mBitmapUrl, SizeUtils.dp2px(200f))
mBitmap = qrcodeBitmap
mDatabind.imageViewScanPay.load(qrcodeBitmap)
}

mDatabind.textViewDownloadPicture.setOnClickListener {
//先判断存储权限是否授权
if (!XXPermissions.isGranted(
this@RechargeQrCodeActivity,
            Manifest.permission.WRITE_EXTERNAL_STORAGE
)
    ) {
XXPermissions.with(this@RechargeQrCodeActivity)
.permission(Permission.WRITE_EXTERNAL_STORAGE)
.request { permissions, all ->
if (all) {
// 保存图片
saveViewToImg(mDatabind.viewTop,this@RechargeQrCodeActivity)
} else {
ToastUtils.showShort("保存权限获取失败！")
}
}

} else {
// 保存图片
saveViewToImg(mDatabind.viewTop,this@RechargeQrCodeActivity)
}

}

/**
 * 把view保存成图片
*/

private fun  saveViewToImg(mView:View,mContext:Context){
// 获取图片的某布局
mView.isDrawingCacheEnabled = true
mView.buildDrawingCache()
lifecycleScope.launch {
// 获取图片
val drawingCache = mView.drawingCache
saveImg(drawingCache)
// 保存事后释放资源
mView.isDrawingCacheEnabled = false
mView.destroyDrawingCache()
}


}

/**
 * 保存图片到本地
*/
private fun saveImg(bitmap: Bitmap) {
val fileName = "qr_" + System.currentTimeMillis() + ".png"
val save2Album = ImageUtils.save2Album(bitmap, fileName, Bitmap.CompressFormat.PNG, false)
if (save2Album != null) {
ToastUtils.showShort("保存成功")
} else {
ToastUtils.showShort("保存失败")
}
}