android_jetpack_databinding常用的自定义BindingAdapter

原文: https://blog.youkuaiyun.com/qq_42420293/article/details/120406041

自定义BindingAdapter

1、ImageView

1.1、给iv绑定img的url

当img的url数据改变, 自动更新img的图片

@BindingAdapter("imageUrl")
fun bindImage(imgView: ImageView, imgUrl: String?) {
    imgUrl?.let {
        val imgUri = imgUrl.toUri().buildUpon().scheme("https").build()
        Glide.with(imgView.context)
                .load(imgUri)
                .apply(RequestOptions()
                        .placeholder(R.drawable.loading_animation)
                        .error(R.drawable.ic_broken_image))
                .into(imgView)
    }
}

1.2、给iv绑定当前状态

根据iv的状态设置iv显示的资源图片及可见性

@BindingAdapter("marsApiStatus")
fun bindStatus(statusImageView: ImageView, status: MarsApiStatus?) {
    when (status) {
        MarsApiStatus.LOADING -> {
            statusImageView.visibility = View.VISIBLE
            statusImageView.setImageResource(R.drawable.loading_animation)
        }
        MarsApiStatus.ERROR -> {
            statusImageView.visibility = View.VISIBLE
            statusImageView.setImageResource(R.drawable.ic_connection_error)
        }
        MarsApiStatus.DONE -> {
            statusImageView.visibility = View.GONE
        }
    }
}

2、RecyclerView

2.1、给rv绑定data

当rv列表数据改变,rv自动更新数据列表

@BindingAdapter("listData")
fun bindRecyclerView(recyclerView: RecyclerView, data: List<MarsProperty>?) {
    val adapter = recyclerView.adapter as PhotoGridAdapter
    adapter.submitList(data)
}

3、TextView

3.1、将接口返回的带html标签的数据使用html格式排版显示

@BindingAdapter("bind_setTextWithHTML")
fun bindText(textView: TextView, text: String?){
    text?.let {

        textView.setText(Html.fromHtml(text))
    }
}

4、WebView

4.1、给webView绑定url

当url改变，自动加载webview显示的网页

@BindingAdapter("bind_webviewUrl")
fun binWebViewUrl(webView: WebView, webUrl: String?){
    webUrl?.let {
        webView.loadUrl(webUrl)
    }
}