android模拟文件上传

【实例截图】

【核心代码】

package com.example.servicedemo

import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.os.Handler
import android.os.Message
import android.os.Messenger
import android.view.View
import android.widget.Button
import android.widget.ProgressBar
import java.lang.ref.WeakReference

class MainActivity2 : AppCompatActivity(), View.OnClickListener  {
    lateinit var intent2: Intent
    var progressBar: ProgressBar?=null
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main2)

        progressBar =findViewById(R.id.progressbar)
        var btn_start_service: Button? = null
        var btn_stop_service: Button? = null
        btn_start_service = findViewById(R.id.btn_start_service)
        btn_stop_service = findViewById(R.id.btn_stop_service)
        btn_stop_service?.setOnClickListener(this)
        btn_start_service?.setOnClickListener(this)

    }


    override fun onClick(v: View?) {
        when (v?.id) {
            R.id.btn_start_service -> {
                // val intent = Intent()
                intent.setClass(this, MyIntentService::class.java)
                intent.action = MyIntentService.DOWNLOAD_ACTION_KEY
                intent.putExtra(MyIntentService.TEST_AUTHOR_KEY, "Jere")
                //将 Messenger 传递给 IntentService, 使其传递消息回来，实现客户端与服务端之间进行沟通
                intent.putExtra(MyIntentService.TEST_MESSENGER_KEY, Messenger(MessengerHandler(this)))
                startService(intent)
            }
            R.id.btn_stop_service -> {
                stopService(intent)
            }
        }
    }
    class MessengerHandler(activity: MainActivity2) : Handler() {
        var weakReference: WeakReference<MainActivity2> = WeakReference(activity)

        override fun handleMessage(msg: Message) {
            super.handleMessage(msg)
            //msg 为 IntentService 回复的消息，包含 Bundle 等信息。
            val bundle: Bundle = msg.data
            //获取 IntentService 传递过来的 下载进度 参数
            val downloadProgressBarValue: Int =
                bundle.get(MyIntentService.DOWNLOAD_PROGRESS_BAR_VALUE_KEY) as Int
            val activity: MainActivity2? = weakReference.get()
            //将下载进度设置成 ProgressBar 的进度，显示出来。
            if (activity != null && !activity.isFinishing) {
                activity.progressBar?.progress=downloadProgressBarValue
            }
        }
    }
}