Android Glide使用

Glide使用

配置

apply plugin: 'kotlin-kapt'

dependencies {
    implementation 'com.github.bumptech.glide:glide:4.12.0'
    annotationProcessor 'com.github.bumptech.glide:compiler:4.12.0'
    kapt 'com.github.bumptech.glide:compiler:4.12.0'
}

基本使用

//加载url
Glide.with(this)
.load(url)
.placeholder(R.drawable.placeholder)
.error(R.drawable.error)
.into(imageView)

//加载本地drawable资源
Glide.with(this)
.load(R.mipmap.ic_launcher)
.into(imageView)

//加载gif，Glide会智能判断
Glide.with(this)
.load(R.drawable.a)
.into(imageView)

//asBitmap只加载静态图片，如果图片为gif则加载第一帧
Glide.with(this)
.asBitmap()
.load(R.drawable.a)
.into(imageView)


//后备回调符
Glide.with(this)
.load(url)
.fallback(R.mipmap.ic_launcher) //当url为null时显示
.into(imageView)

RequestOptions

Glide的配置都可以通过RequestOptions配置，用于提取公共属性

val options = RequestOptions()
.placeholder(R.drawable.placeholder)
.error(R.drawable.error)
.fallback(R.mipmap.ic_launcher)

Glide.with(this)
.load(url)
.apply(options)
.into(imageView)

图片大小设置

Glide.with(this)
.load(url)
.override(100, 100)
.into(imageView)

缩略图

缩略图可以从网络中加载，缩略图加载完后才会显示原图

Glide.with(this)
.load(url)
.thumbnail(0.2F) //只会显示原图20%
.into(imageView)

加载缩略图url

先加载缩略图url，再加载原图url

val thumbnailRequest = Glide.with(this).load(url2)

Glide.with(this)
.load(url1)
.diskCacheStrategy(DiskCacheStrategy.NONE)
.thumbnail(thumbnailRequest)
.into(imageView2)

缓存设置

Glide默认开启内存缓存和硬盘缓存

内存缓存策略

//禁用内存缓存
Glide.with(this)
.load(url)
.skipMemoryCache(true)
.into(imageView)

硬盘缓存策略

• DiskCacheStrategy.NONE：不开启硬盘缓存
• DiskCacheStrategy.Data：只缓存原始图片
• DiskCacheStrategy.RESOURCE：只缓存转换后的图片
• DiskCacheStrategy.ALL：同时缓存原始图片和转换后图片
• DiskCacheStrategy.AUTOMATIC：智能模式，Glide根据图片资源选择模式

Glide.with(this)
.load(url)
.diskCacheStrategy(DiskCacheStrategy.NONE)
.into(imageView)

回调监听

into()

Glide将图片加载入ImageView中

val target = object : CustomViewTarget<ImageView, Drawable>(imageView) {

    override fun onResourceLoading(placeholder: Drawable?) {
        super.onResourceLoading(placeholder)
        Log.e(TAG, "开始加载")
    }

    override fun onLoadFailed(errorDrawable: Drawable?) {
        Log.e(TAG, "加载失败")
        (view as ImageView).setImageResource(R.drawable.error)
    }

    override fun onResourceReady(resource: Drawable, transition: Transition<in Drawable>?) {
        Log.e(TAG, "加载成功")
        (view as ImageView).setImageDrawable(resource)
    }

    override fun onResourceCleared(placeholder: Drawable?) {
        Log.e(TAG, "资源清理")
    }
}

Glide.with(this)
.load(url)
.diskCacheStrategy(DiskCacheStrategy.NONE)
.into(target)

preload()

Glide提供了预加载

Glide.with(this)
.load(url)
.preload()

submit()

可以用于文件下载

thread {
    val target = Glide.with(applicationContext)
    .asFile()
    .load(url)
    .submit()
    val imageFile = target.get()
    val file = File(cacheDir, "hello222.png")
    imageFile.copyTo(file)

    runOnUiThread {
        Toast.makeText(applicationContext, "成功", Toast.LENGTH_SHORT).show()
    }
}

listener()

监听Glide加载图片的状态

Glide.with(this)
.load(url)
.listener(object : RequestListener<Drawable> {
    override fun onLoadFailed(
        e: GlideException?,
        model: Any?,
        target: Target<Drawable>?,
        isFirstResource: Boolean
    ): Boolean {
        Log.e(TAG, "加载失败")
        return false
    }

    override fun onResourceReady(
        resource: Drawable?,
        model: Any?,
        target: Target<Drawable>?,
        dataSource: DataSource?,
        isFirstResource: Boolean
    ): Boolean {
        Log.e(TAG, "加载成功")
        return false
    }
})
.into(imageView)

过渡效果

Glide.with(this)
.load(url)
.diskCacheStrategy(DiskCacheStrategy.NONE)
.transition(withCrossFade(1000)) //默认为300ms
.into(imageView)

自定义过渡效果

定义动画

设置动画

Glide.with(this)
    .load(url)
    .diskCacheStrategy(DiskCacheStrategy.NONE)
    .transition(GenericTransitionOptions.with(R.anim.anim_alpha))
    .into(imageView2)

图片变形

裁剪方式

Glide.with(this)
.load(url)
//.centerCrop() //居中剪裁
//.fitCenter() // 默认
.circleCrop() //圆形图片
.into(imageView)

自定义图片变形

class CircleCrop(context: Context) : BitmapTransformation() {
    private val ID = "com.example.myapplication"

    override fun updateDiskCacheKey(messageDigest: MessageDigest) {
        messageDigest.update(ID.toByteArray())
    }

    override fun transform(
        pool: BitmapPool,
        toTransform: Bitmap,
        outWidth: Int,
        outHeight: Int
    ): Bitmap {
        if (toTransform.width == outWidth && toTransform.height == outHeight) {
            return toTransform
        }
        return Bitmap.createScaledBitmap(
            toTransform,
            10, 10, false
        )
    }

    override fun equals(other: Any?): Boolean {
        return other is CircleCrop
    }

    override fun hashCode(): Int {
        return ID.hashCode()
    }

}

Glide.with(this)
    .load(url)
    .transform(CircleCrop(this))
    .into(imageView)

模糊效果

implementation 'jp.wasabeef:glide-transformations:4.3.0'
implementation 'jp.co.cyberagent.android:gpuimage:2.1.0'

Glide.with(this)
.load(url)
.apply(RequestOptions.bitmapTransform(BlurTransformation(25, 3)))
.into(imageView)

多效果混合

//模糊效果+底部圆角效果
val multi = MultiTransformation<Bitmap>(
    BlurTransformation(25),
    RoundedCornersTransformation(128, 0, RoundedCornersTransformation.CornerType.BOTTOM)
)
Glide.with(this)
.load(url)
.diskCacheStrategy(DiskCacheStrategy.NONE)
.apply(RequestOptions.bitmapTransform(multi))
.into(imageView)

更多变换功能

网上出现了很多Glide的图片变换开源库，其中做的最出色的应该要数glide-transformations