解决Android4.4及以下Volley框架Patch请求报错问题（Kotlin）

volley请求在4.4以下调用patch请求,会报以下错误

java.net.ProtocolException: Unknown method ‘PATCH’; must be one of [OPTIONS, GET, HEAD, POST, PUT, DELETE, TRACE]

解决方案：
借助okHttp发送请求

1.导入相关jar包：
okhttp-2.2.0.jar
okhttp-urlconnection-2.2.0.jar
okio-1.2.0.jar
httpcore-4.2.4
下载地址：okhttp相关包

2.新建OkHttpStack类(Kotlin代码)

import com.android.volley.toolbox.HttpStack
import com.android.volley.AuthFailureError
import com.android.volley.Request
import com.squareup.okhttp.MediaType
import com.squareup.okhttp.OkHttpClient
import com.squareup.okhttp.Protocol
import com.squareup.okhttp.RequestBody
import org.apache.http.HttpEntity
import org.apache.http.ProtocolVersion
import org.apache.http.entity.BasicHttpEntity
import org.apache.http.message.BasicHeader
import org.apache.http.message.BasicHttpResponse
import org.apache.http.message.BasicStatusLine
import java.io.IOException
import java.util.concurrent.TimeUnit




/**
 * Created by Raleigh.Luo on 17/11/20.
 * 解决Volley Patch请求在5.0以下不能使用的问题
 * com.android.volley.NoConnectionError: java.net.ProtocolException: Unknown method 'PATCH'; must be one of [OPTIONS, GET, HEAD, POST, PUT, DELETE, TRACE]
 */
class OkHttpStack : HttpStack {
    private val mClient: OkHttpClient
    constructor(client: OkHttpClient) {
        this.mClient = client
    }

    @Throws(IOException::class, AuthFailureError::class)
    override fun performRequest(request: Request<*>?, additionalHeaders: MutableMap<String, String>?): org.apache.http.HttpResponse {
        val client = mClient.clone()
        val timeoutMs = request?.getTimeoutMs()?.toLong()?:0L
        client.setConnectTimeout(timeoutMs, TimeUnit.MILLISECONDS)
        client.setReadTimeout(timeoutMs, TimeUnit.MILLISECONDS)
        client.setWriteTimeout(timeoutMs, TimeUnit.MILLISECONDS)

        val okHttpRequestBuilder = com.squareup.okhttp.Request.Builder()
        okHttpRequestBuilder.url(request?.getUrl())

        val headers = request?.getHeaders()
        headers?.keys?.let {
            for (name in it) {
                okHttpRequestBuilder.addHeader(name, headers.get(name))
            }
        }
        additionalHeaders?.keys?.let {
            for (name in it) {
                okHttpRequestBuilder.addHeader(name, additionalHeaders[name])
            }
        }
        setConnectionParametersForRequest(okHttpRequestBuilder, request!!)

        val okHttpRequest = okHttpRequestBuilder.build()
        val okHttpCall = client.newCall(okHttpRequest)
        val okHttpResponse = okHttpCall.execute()

        val responseStatus = BasicStatusLine(
                parseProtocol(okHttpResponse.protocol()),
                okHttpResponse.code(),
                okHttpResponse.message()
        )

        val response = BasicHttpResponse(responseStatus)
        response.setEntity(entityFromOkHttpResponse(okHttpResponse))

        val responseHeaders = okHttpResponse.headers()

        var i = 0
        val len = responseHeaders.size()
        while (i < len) {
            val name = responseHeaders.name(i)
            val value = responseHeaders.value(i)

            if (name != null) {
                response.addHeader(BasicHeader(name, value))
            }
            i++
        }

        return response
    }

    @Throws(IOException::class)
    private fun entityFromOkHttpResponse(r: com.squareup.okhttp.Response): HttpEntity {
        val entity = BasicHttpEntity()
        val body = r.body()

        entity.content = body.byteStream()
        entity.contentLength = body.contentLength()
        entity.setContentEncoding(r.header("Content-Encoding"))

        if (body.contentType() != null) {
            entity.setContentType(body.contentType().type())
        }
        return entity
    }


    @Throws(IOException::class, AuthFailureError::class)
    private fun setConnectionParametersForRequest(builder: com.squareup.okhttp.Request.Builder, request: Request<*>) {
        when (request.getMethod()) {
            Request.Method.DEPRECATED_GET_OR_POST -> {
                // Ensure backwards compatibility.
                // Volley assumes a request with a null body is a GET.
                val postBody = request.getPostBody()

                if (postBody != null) {
                    builder.post(RequestBody.create(MediaType.parse(request.getPostBodyContentType()), postBody))
                }
            }

            Request.Method.GET -> builder.get()

            Request.Method.DELETE -> builder.delete()

            Request.Method.POST -> builder.post(createRequestBody(request))

            Request.Method.PUT -> builder.put(createRequestBody(request))

            Request.Method.HEAD -> builder.head()

            Request.Method.OPTIONS -> builder.method("OPTIONS", null)

            Request.Method.TRACE -> builder.method("TRACE", null)

            Request.Method.PATCH -> builder.patch(createRequestBody(request))

            else -> throw IllegalStateException("Unknown method type.")
        }
    }

    private fun parseProtocol(p: Protocol): ProtocolVersion {
        when (p) {
            Protocol.HTTP_1_0 -> return ProtocolVersion("HTTP", 1, 0)
            Protocol.HTTP_1_1 -> return ProtocolVersion("HTTP", 1, 1)
            Protocol.SPDY_3 -> return ProtocolVersion("SPDY", 3, 1)
            Protocol.HTTP_2 -> return ProtocolVersion("HTTP", 2, 0)
        }

        throw IllegalAccessError("Unkwown protocol")
    }

    @Throws(AuthFailureError::class)
    private fun createRequestBody(r: Request<*>): RequestBody? {
        val body = r.body ?: return null

        return RequestBody.create(MediaType.parse(r.bodyContentType), body)
    }
}

4.再添加到volley请求队列中

                    if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.M){//5.0及以上使用volley
                                      Volley.newRequestQueue(getApplicationContext()).add(request)

}else{//5.0以下使用okhttp
                                          Volley.newRequestQueue(getApplicationContext(),new OkHttpStack()).add(request)
}

request和volley中的request一致，可以使用jsonRequest，stringRequest和jsonArrayRequest

解决Android4.4及以下Volley框架Patch请求报错问题（Kotlin）

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