Merge pull request hzuapps#627 from nihenlundun/master

hzuapps#90 hzuapps#80 #lab4

app/src/main/java/edu/hzuapps/androidworks/homeworks/net1314080903225/Net1314080903225MainActivity.java

@@ -0,0 +1,231 @@
+package com.hui.multidown;
+
+import android.os.Bundle;
+import android.os.Environment;
+import android.os.Handler;
+import android.os.Message;
+import android.support.design.widget.FloatingActionButton;
+import android.support.design.widget.Snackbar;
+import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.Toolbar;
+import android.util.Log;
+import android.view.View;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.ProgressBar;
+import android.widget.Toast;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.RandomAccessFile;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+
+public class Net1314080903225MainActivity extends AppCompatActivity {
+
+    private ProgressBar progressBar;
+
+    private int total = 0;
+    private boolean downloading = false;
+    private URL url;
+    private File file;
+    private Button btn_down;
+    private EditText et_fileUrl;
+
+    private int length;
+
+    Handler handler = new Handler(new Handler.Callback() {
+        @Override
+        public boolean handleMessage(Message msg) {
+            if (msg.what == 0) {
+                progressBar.setProgress(msg.arg1);
+                if (msg.arg1 == length) {
+                    Toast.makeText(MainActivity.this, "下载完成！", Toast.LENGTH_SHORT).show();
+                    total = 0;
+                }
+            }
+            return false;
+        }
+    });
+
+    private List<HashMap<String, Integer>> threadList;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
+        setSupportActionBar(toolbar);
+
+        et_fileUrl = (EditText) findViewById(R.id.FileUrl);
+        btn_down = (Button) findViewById(R.id.btn_down);
+        progressBar = (ProgressBar) findViewById(R.id.progress);
+
+        threadList = new ArrayList<>();
+
+        btn_down.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                if (downloading) {
+                    downloading = false;
+                    btn_down.setText("下载");
+                    return;
+                }
+                downloading = true;
+                btn_down.setText("暂停");
+
+                if (threadList.size() == 0) {
+                    new Thread(new Runnable() {
+                        @Override
+                        public void run() {
+                            try {
+                                url = new URL(et_fileUrl.getText().toString());
+                                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
+                                conn.setRequestMethod("GET");
+                                conn.setConnectTimeout(5000);
+                                conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727)");
+                                length = conn.getContentLength();
+
+                                progressBar.setMax(length);
+                                progressBar.setProgress(0);
+
+                                if (length < 0) {
+                                    Toast.makeText(MainActivity.this, "文件不存在！", Toast.LENGTH_SHORT).show();
+                                    return;
+                                }
+
+                                file = new File(Environment.getExternalStorageDirectory(), getFileName(et_fileUrl.getText().toString()));
+                                RandomAccessFile randomFile = new RandomAccessFile(file, "rw");
+                                randomFile.setLength(length);
+
+                                int blockSize = length / 3;
+                                for (int i = 0; i < 3; i++) {
+                                    int begin = i * blockSize;
+                                    int end = (i + 1) * blockSize - 1;
+                                    if (i == 2) {
+                                        end = length;
+                                    }
+
+                                    HashMap<String, Integer> map = new HashMap<String, Integer>();
+                                    map.put("begin", begin);
+                                    map.put("end", end);
+                                    map.put("finished", 0);
+                                    threadList.add(map);
+
+                                    //创建新的线程，下载文件。
+                                    Thread t = new Thread(new DownloadRunnable(i, begin, end, file, url));
+                                    t.start();
+                                }
+
+                            } catch (MalformedURLException e) {
+                                Toast.makeText(MainActivity.this, "URL 不正确！", Toast.LENGTH_SHORT).show();
+                                e.printStackTrace();
+                            } catch (IOException e) {
+                                e.printStackTrace();
+                            }
+                        }
+                    }).start();
+                } else {
+                    //恢复下载
+                    for (int i = 0; i < threadList.size(); i++) {
+                        HashMap<String, Integer> map = threadList.get(i);
+                        int begin = map.get("begin");
+                        int end = map.get("end");
+                        int finished = map.get("finished");
+                        Thread t = new Thread(new DownloadRunnable(i, begin + finished, end, file, url));
+                        t.start();
+                    }
+                }
+            }
+        });
+
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        // Inflate the menu; this adds items to the action bar if it is present.
+        getMenuInflater().inflate(R.menu.menu_main, menu);
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        // Handle action bar item clicks here. The action bar will
+        // automatically handle clicks on the Home/Up button, so long
+        // as you specify a parent activity in AndroidManifest.xml.
+        int id = item.getItemId();
+
+        //noinspection SimplifiableIfStatement
+        if (id == R.id.action_settings) {
+            return true;
+        }
+
+        return super.onOptionsItemSelected(item);
+    }
+
+    private String getFileName(String url) {
+        int index = url.lastIndexOf("/") + 1;
+        return url.substring(index);
+    }
+
+    class DownloadRunnable implements Runnable {
+
+        private int begin;
+        private int end;
+        private File file;
+        private URL url;
+        private int id;
+
+        public DownloadRunnable(int id, int begin, int end, File file, URL url) {
+            this.file = file;
+            this.id = id;
+            this.begin = begin;
+            this.end = end;
+            this.url = url;
+        }
+
+        @Override
+        public void run() {
+            try {
+                if (begin > end) {
+                    return;
+                }
+                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
+                conn.setRequestMethod("GET");
+                conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727)");
+                conn.setRequestProperty("Range", "bytes=" + begin + "-" + end);
+
+                InputStream is = conn.getInputStream();
+                byte[] buf = new byte[1024 * 1024];
+                RandomAccessFile randomFile = new RandomAccessFile(file, "rw");
+                randomFile.seek(begin);
+                int len = 0;
+                HashMap<String, Integer> map = threadList.get(id);
+                while ((len = is.read(buf)) != -1 && downloading) {
+                    randomFile.write(buf, 0, len);
+                    updateProgress(len);
+                    map.put("finished", map.get("finished") + len);
+                    Log.d("Download length: ", "" + total);
+                }
+
+                is.close();
+                randomFile.close();
+
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+
+    synchronized private void updateProgress(int add) {
+        total += add;
+        handler.obtainMessage(0, total, 0).sendToTarget();
+    }
+}

app/src/main/res/layout/content_main_Net1314080903225.xml

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent"
+    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
+    android:paddingRight="@dimen/activity_horizontal_margin"
+    android:paddingTop="@dimen/activity_vertical_margin"
+    android:paddingBottom="@dimen/activity_vertical_margin"
+    app:layout_behavior="@string/appbar_scrolling_view_behavior"
+    tools:showIn="@layout/activity_main"
+    tools:context=".Net1314080903225MultiDown"
+    android:orientation="vertical"
+    android:background="@drawable/bashen">
+
+    <EditText
+        android:id="@+id/FileUrl"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content" />
+
+    <ProgressBar
+        style="@style/Base.Widget.AppCompat.ProgressBar.Horizontal"
+        android:id="@+id/progress"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content" />
+
+    <Button
+        android:text="下载"
+        android:id="@+id/btn_down"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content" />
+
+</LinearLayout>

app/src/main/res/layout/content_net1314080903225.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent"
+    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
+    android:paddingRight="@dimen/activity_horizontal_margin"
+    android:paddingTop="@dimen/activity_vertical_margin"
+    android:paddingBottom="@dimen/activity_vertical_margin"
+    app:layout_behavior="@string/appbar_scrolling_view_behavior"
+    tools:showIn="@layout/activity_main"
+    tools:context=".Net1314080903225MainActivity"
+    android:orientation="vertical"
+    android:background="@drawable/bashen">
+
+    <EditText
+        android:id="@+id/FileUrl"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content" />
+
+    <ProgressBar
+        style="@style/Base.Widget.AppCompat.ProgressBar.Horizontal"
+        android:id="@+id/progress"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content" />
+
+    <Button
+        android:text="下载"
+        android:id="@+id/btn_down"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content" />
+
+</LinearLayout>