如何通过Glide加载本地图片替代网络URL图片？

场景1：图片存放在res/drawable目录下 #

将Glide的网络URL替换为Android资源ID即可直接加载本地资源，修改后的代码如下：

private fun updateView() {
    imageViewBackground.post {
        ThreadUtil.startThread {
            // 替换为你放在drawable目录下的图片资源ID
            val localImageRes = R.drawable.teacher_photo
            val futureTarget: FutureTarget<Bitmap> = Glide.with(this)
                .asBitmap()
                .load(localImageRes) // 改为加载本地资源
                .submit(imageViewBackground.width, imageViewBackground.height)
            val bitmap = futureTarget.get()

            ThreadUtil.startUIThread(delayMillis = 0) {
                imageViewBackground.setImageBitmap(bitmap)

                frameLayoutInputArea.post {
                    var cropBitmap = Bitmap.createBitmap(imageViewBackground.width, imageViewBackground.height, Bitmap.Config.ARGB_8888)
                    val canvas = Canvas(cropBitmap)
                    imageViewBackground.draw(canvas)

                    cropBitmap = Bitmap.createBitmap(cropBitmap, frameLayoutInputArea.x.toInt(), frameLayoutInputArea.y.toInt(), frameLayoutInputArea.width, frameLayoutInputArea.height)

                    imageViewBlur.setImageBitmap(BitmapUtil.blurBitmap(this, cropBitmap))
                }
            }
        }
    }
}

场景2：图片是手机存储中的本地文件 #

如果图片在内部/外部存储路径下，直接加载对应的File对象或路径字符串：

private fun updateView() {
    imageViewBackground.post {
        ThreadUtil.startThread {
            // 替换为本地图片的绝对路径
            val localImagePath = "/storage/emulated/0/DCIM/Camera/teacherPhoto.jpg"
            val futureTarget: FutureTarget<Bitmap> = Glide.with(this)
                .asBitmap()
                .load(File(localImagePath)) // 改为加载本地文件
                .submit(imageViewBackground.width, imageViewBackground.height)
            val bitmap = futureTarget.get()

            ThreadUtil.startUIThread(delayMillis = 0) {
                imageViewBackground.setImageBitmap(bitmap)

                frameLayoutInputArea.post {
                    var cropBitmap = Bitmap.createBitmap(imageViewBackground.width, imageViewBackground.height, Bitmap.Config.ARGB_8888)
                    val canvas = Canvas(cropBitmap)
                    imageViewBackground.draw(canvas)

                    cropBitmap = Bitmap.createBitmap(cropBitmap, frameLayoutInputArea.x.toInt(), frameLayoutInputArea.y.toInt(), frameLayoutInputArea.width, frameLayoutInputArea.height)

                    imageViewBlur.setImageBitmap(BitmapUtil.blurBitmap(this, cropBitmap))
                }
            }
        }
    }
}

优化建议：简化线程管理 #

Glide本身已经封装了异步加载逻辑，无需手动创建线程，可简化代码：

private fun updateView() {
    imageViewBackground.post {
        Glide.with(this)
            .asBitmap()
            .load(R.drawable.teacher_photo) // 替换为对应资源ID或File对象
            .into(object : CustomTarget<Bitmap>(imageViewBackground.width, imageViewBackground.height) {
                override fun onResourceReady(resource: Bitmap, transition: Transition<in Bitmap>?) {
                    imageViewBackground.setImageBitmap(resource)
                    frameLayoutInputArea.post {
                        var cropBitmap = Bitmap.createBitmap(imageViewBackground.width, imageViewBackground.height, Bitmap.Config.ARGB_8888)
                        val canvas = Canvas(cropBitmap)
                        imageViewBackground.draw(canvas)

                        cropBitmap = Bitmap.createBitmap(cropBitmap, frameLayoutInputArea.x.toInt(), frameLayoutInputArea.y.toInt(), frameLayoutInputArea.width, frameLayoutInputArea.height)

                        imageViewBlur.setImageBitmap(BitmapUtil.blurBitmap(this@YourActivity, cropBitmap))
                    }
                }

                override fun onLoadCleared(placeholder: Drawable?) {
                    // 可选：资源回收时的处理逻辑
                }
            })
    }
}

注意：替换this@YourActivity为当前Activity的类名，比如this@MainActivity。

内容的提问来源于stack exchange，提问作者Vugar