diff --git a/app/src/main/java/edu/hzuapps/androidworks/homeworks/net1314080903225/Net1314080903225MainActivity.java b/app/src/main/java/edu/hzuapps/androidworks/homeworks/net1314080903225/Net1314080903225MainActivity.java new file mode 100644 index 00000000..322bc75d --- /dev/null +++ b/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> 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 map = new HashMap(); + 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 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 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(); + } +} diff --git a/app/src/main/res/drawable/Net1314080903225_lab4_1.JPG b/app/src/main/res/drawable/Net1314080903225_lab4_1.JPG new file mode 100644 index 00000000..0aa31b47 Binary files /dev/null and b/app/src/main/res/drawable/Net1314080903225_lab4_1.JPG differ diff --git a/app/src/main/res/drawable/Net1314080903225_lab4_2.JPG b/app/src/main/res/drawable/Net1314080903225_lab4_2.JPG new file mode 100644 index 00000000..ac7ba078 Binary files /dev/null and b/app/src/main/res/drawable/Net1314080903225_lab4_2.JPG differ diff --git a/app/src/main/res/drawable/Net1314080903225_lab4_3.JPG b/app/src/main/res/drawable/Net1314080903225_lab4_3.JPG new file mode 100644 index 00000000..1fa51c2c Binary files /dev/null and b/app/src/main/res/drawable/Net1314080903225_lab4_3.JPG differ diff --git a/app/src/main/res/drawable/Net1314080903225_lab4_4.JPG b/app/src/main/res/drawable/Net1314080903225_lab4_4.JPG new file mode 100644 index 00000000..4f5c31de Binary files /dev/null and b/app/src/main/res/drawable/Net1314080903225_lab4_4.JPG differ diff --git a/app/src/main/res/layout/content_main_Net1314080903225.xml b/app/src/main/res/layout/content_main_Net1314080903225.xml new file mode 100644 index 00000000..92789a77 --- /dev/null +++ b/app/src/main/res/layout/content_main_Net1314080903225.xml @@ -0,0 +1,32 @@ + + + + + + + +