报异常java.net.MalformedURLException: no protocol:

Question

安卓初学者求助
尝试弄一个能从网上下载特定资源的多线程下载器（输入url地址，以及文件名后就能下载文件）当我在布局文件中写死了固定的url地址时能够正常访问并成功下载到文件，但是当我在输入框中自己输入url地址时却报异常MalformedURLException: no protocol:package com.getsre;import android.graphics.Color;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {    private static final String TAG = "com.getsre";
    private String Urlpath;    String file = "data/data/com.getsre/";
    private File f;
    List list;
    private int threadNum = 3;
    private LinearLayout tv;
    private EditText edname;
    private EditText edurl;
    private Button btgo;    Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            list = new ArrayList();
            switch (msg.what) {
                case 0:
                    list.add("线程0开始下载……");
                    break;
                case 1:
                    list.add("线程1开始下载……");
                    break;
                case 2:
                    list.add("线程2开始下载……" + "\n" + "文件大小：" + msg.obj);
                    break;
                case 20:
                    list.add("线程0完成");
                    break;
                case 21:
                    list.add("线程1完成");
                    break;
                case 22:
                    list.add("线程2完成");
                    break;
                default:
                    break;
            }
            for (Object Info : list) {
                TextView ChildView;
                ChildView = new TextView(MainActivity.this);
                ChildView.setTextSize(23);
                ChildView.setTextColor(Color.BLACK);
                ChildView.setText(String.valueOf(Info));
                tv.addView(ChildView);
            }
        }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);        tv = (LinearLayout) findViewById(R.id.tv);
        edname = (EditText) findViewById(R.id.ed_name);
        edurl = (EditText) findViewById(R.id.ed_url);
        btgo = (Button) findViewById(R.id.bt);        Urlpath=edurl.getText().toString();
//        Urlpath = String.valueOf(edurl.getText());
        f = new File(file + String.valueOf(edname.getText()));
        btgo.setOnClickListener(this);    }    @Override
    public void onClick(View view) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                test();
            }
        }).start();
    }    public void test() {
        try {
            URL url = new URL(Urlpath);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setConnectTimeout(5000);
            int code = conn.getResponseCode();            if (code == 200) {
                long size = conn.getContentLength();
                long block = size / threadNum;                RandomAccessFile raf = new RandomAccessFile(f, "rw");
                raf.setLength(size);
                raf.close();
                Log.i(TAG, "文件大小= " + size);
                for (int i = 0; i < threadNum; i++) {
                    long startpos = i * block;
                    long endpos = block * (i + 1) - 1;
                    if (i == threadNum) {
                        endpos = size;
                    }
                    Log.i(TAG, "线程" + i + "下载的部分为：" + startpos + "---" + endpos);                    Message msg = new Message();
                    msg.what = i;
                    String b = Convert(size);
                    msg.obj = b;
                    handler.sendMessage(msg);
                    new Download(i, startpos, endpos).start();
                }
            } else {
                Log.i(TAG, "访问失败: responseCode = " + code);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }    public String Convert(long size) {
        if (size > 1024) {
            long d = size / (1024 * 1024);
            return d + "MB";
        } else return size + "字节";
    }    class Download extends Thread {
        private int i = 0;
        private long startpos;
        private long endpos;        public Download(int i, long startpos, long endpos) {
            this.i = i;
            this.startpos = startpos;
            this.endpos = endpos;
        }        @Override
        public void run() {
            try {
                URL url = new URL(Urlpath);
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setRequestMethod("GET");
                conn.setConnectTimeout(5000);                conn.setRequestProperty("range","bytes="+startpos+"-"+endpos);
                if (conn.getResponseCode()==206) {
                    InputStream is = conn.getInputStream();
                    RandomAccessFile raf = new RandomAccessFile(f, "rw");
                    raf.seek(startpos);
                    Read(is, raf);
                    Log.i(TAG,"线程" + i + "下载完毕...");                    Message msg=new Message();
                    msg.what=i+20;
//                    msg.obj="下载完成";
                    handler.sendMessage(msg);
                }
                }catch (Exception e) {
                e.printStackTrace();
            }
            }
        }        public void Read(InputStream is, RandomAccessFile raf) {
            int len = 0;
            byte[] buffer = new byte[1024];
            try {
                while ((len = is.read(buffer)) != -1) {
                    raf.write(buffer, 0, len);
                }
                is.close();
            } catch (Exception e) {
                Log.i(TAG, "运行Read方法出现异常!!!!!!!!!!!!!!!");
                e.printStackTrace();
            }
        }
    }布局文件<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.getsre.MainActivity"><LinearLayout
        android:layout_width="368dp"
        android:layout_height="495dp"
        android:orientation="vertical">    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="370dp">
        <LinearLayout
            android:id="@+id/tv"
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="match_parent">        </LinearLayout>    </ScrollView>    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="URL地址："/>
        <EditText
            android:id="@+id/ed_url"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:singleLine="true"
            android:hint="输入URL地址"/>    <!--android:text="http://dlsw.baidu.com/sw-search-sp/soft/24/13406/XiuXiu_V4.0.1.2002_BdSetup.1437647987.exe"-->    </LinearLayout>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="重命名："/>
        <EditText
            android:id="@+id/ed_name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:singleLine="true"
            android:hint="重命名加上后缀"/>            <!--android:text="XiuXiu_V4.0.1.2002_BdSetup.1437647987.exe"-->    </LinearLayout>
    </LinearLayout>
    <Button
        android:id="@+id/bt"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="GO" /></LinearLayout>
</android.support.constraint.ConstraintLayout>

Answer 1

你的url前面是不是没有带http 或者 https ?

Answer 2

已经解决了，
是我在获取EditText中文本内容的时候出了问题，在点击事件之前获取输入框中的内容，但此时输入框中还没有输入任何内容