Android Open Source - relaxing-music Download Activity

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From Project

Back to project page relaxing-music.

License

The source code is released under:

GNU General Public License

Java Source Code

package com.ayao.player ;
// w  w w.ja  v  a 2  s. c o m
import android.app.DownloadManager ;
import android.app.DownloadManager.Request ;
import android.net.Uri ;
import android.content.Context ;
import android.content.IntentFilter ;
import android.content.BroadcastReceiver ;
import android.app.Activity ;
import android.os.Bundle ;
import android.content.Intent ;
import android.util.Log ;
import java.io.FileInputStream ;
import org.apache.http.util.EncodingUtils ;

import android.widget.Button ;
import android.view.View ;
import android.widget.TextView ;
import android.widget.LinearLayout ;
import android.widget.ScrollView ;

import java.util.HashMap ;
import java.io.File ;
import java.net.URLEncoder ;
import android.support.v4.content.LocalBroadcastManager ;

import java.net.DatagramSocket ;
import java.net.InetAddress ;
import java.net.DatagramPacket ;

import android.view.KeyEvent ;


public class DownloadActivity extends Activity implements Button.OnClickListener
{
    // index?????????
    private String INDEX_FILE_URL = "https://dl.dropboxusercontent.com/u/147517952/relax-music/index" ;
    // index?????????
    private String INDEX_FILE_PATH = "sdcard/music-app/index" ; 

    // ??????url???????????URL????=url???+????????)
    private String m_UrlPrefix ;
    // ???????????????
    private String[] m_MusicFiles ; 

    private BroadcastReceiver m_BroadcastReceiver ;


    // ????????????
    private void onDownloadCompleted(File f)
    {
  Log.v("DownloadActivity", "onDownloadCompleted(" + f.getName() + ")") ;

  if (f.getName().equals("index")) 
      onIndexFileDownloadCompleted(f) ;
  else
      onMusicFileDownloadCompleted(f) ;
  
  // disable???????
  // ...
    }

    private void onMusicFileDownloadCompleted(File f)
    {
  for(int i=0; i<m_MusicFiles.length; ++i) 
      {
    Button btn = (Button)findViewById(i) ;
    if (m_MusicFiles[i].equals(f.getName()))
        {
      btn.setText(m_MusicFiles[i] + "???") ;
      btn.setEnabled(false) ;
        }
      }
    }

    
    // index?????
    private void onIndexFileDownloadCompleted(File f)
    {
  if (!f.exists()) return ;

  // ???????????
  String indexStr = "" ;
  try {
      FileInputStream fin = new FileInputStream(f.getAbsolutePath()) ;
      int length = fin.available() ;
      byte[] buffer = new byte[length] ;
      fin.read(buffer) ;

      indexStr = EncodingUtils.getString(buffer, "UTF-8") ;
      fin.close() ;
  }catch (Exception e)
      {
    e.printStackTrace() ;
      }

  String[] lines = indexStr.split("\n") ;
  int num = lines.length - 1 ;

  // ???????url??????????
  m_UrlPrefix = lines[0] ;
  m_MusicFiles = new String[num] ;
  for(int i=0; i<num; ++i){
      m_MusicFiles[i] = lines[i+1] ;
      Log.v("DownloadActivity", "MusicFile" + i + "(" + 
      m_MusicFiles[i] + ")") ;
  }

  Log.v("DownloadActivity", "urlPrefix(" + m_UrlPrefix + ")") ;


  // ??????
  f.delete() ;

  initUI() ;
    }

    // ????index????????????????UI
    private void initUI()
    {
  Log.v("DownloadActivity", "initUI") ;

  LinearLayout llayout = new LinearLayout(this) ;
  llayout.setOrientation(LinearLayout.VERTICAL) ;
  
  for(int i=0; i<m_MusicFiles.length; ++i)
      {
    if (alreadyHaveMusicFile(m_MusicFiles[i])) continue ;
    
    Button btn = new Button(this) ;
    btn.setId(i) ;
    btn.setText(m_MusicFiles[i]) ;
    llayout.addView(btn) ;
    btn.setOnClickListener(this) ;
      }
  
  ScrollView sc = new ScrollView(this) ;
  sc.addView(llayout) ;
  setContentView(sc) ;

  setTitle("???????") ;
  int count = llayout.getChildCount() ;
  if (count == 0)
      {
    TextView tv = new TextView(this) ;
    tv.setText("????????????????????????????????/sdcard/music-app/???????????????????????(yaozhou.wuhu@gmail.com)???????????????????BUG???????????????????????!") ;
    llayout.addView(tv) ;
      }
    }

    boolean alreadyHaveMusicFile(String baseFileName)
    {
  File musicDir = new File("/sdcard/music-app/") ;
  File[] files = musicDir.listFiles() ;

  for(int i=0; i<files.length; ++i) {
      if (files[i].getName().equals(baseFileName))
    return true ;
  }

  return false ;
    }

    @Override
  public void onCreate(Bundle savedInstanceState)
    {
  super.onCreate(savedInstanceState) ;

  File f = new File(INDEX_FILE_PATH) ;
  if (f.exists()) f.delete() ;
  
  startDownloadFile(INDEX_FILE_URL, "index", false) ;

  m_BroadcastReceiver = new BroadcastReceiver() {
    @Override
        public void onReceive(Context context, Intent intent) {
        String fileName = intent.getStringExtra("fileName") ;
        File f = new File(fileName) ;
        onDownloadCompleted(f) ;
    }
      } ;

  LocalBroadcastManager.getInstance(this).registerReceiver(
   m_BroadcastReceiver, new IntentFilter("download_completed"));

    }

    @Override
  public void onStop()
    {
  Log.v("DownloadActivity", "onStop") ;
  super.onStop() ;
  
  LocalBroadcastManager.getInstance(this).unregisterReceiver(
           m_BroadcastReceiver) ;

    }

    @Override
  public void onClick(View view)
    {
  int idx = view.getId() ;
  
  try {
      String url = m_UrlPrefix + URLEncoder.encode(
     m_MusicFiles[idx], "UTF-8") ;

      startDownloadFile(url, m_MusicFiles[idx], true) ;
      ((Button)view).setText(m_MusicFiles[idx] + "(???)") ;
      ((Button)view).setEnabled(false) ;
  }catch (Exception e) {
      e.printStackTrace() ;
  }
    }

    @Override
  public boolean onKeyDown(int keyCode, KeyEvent event)
    {
  switch (keyCode)
      {
      case KeyEvent.KEYCODE_VOLUME_UP:
    sendUDPPacket("up") ; return true ;
      case KeyEvent.KEYCODE_VOLUME_DOWN:
    sendUDPPacket("down") ; return true ;
      default:
    return super.onKeyUp(keyCode, event) ;
      }
    }

    @Override
  public boolean onKeyUp(int keyCode, KeyEvent event)
    {
  switch (keyCode)
      {
      case KeyEvent.KEYCODE_VOLUME_UP:
      case KeyEvent.KEYCODE_VOLUME_DOWN:
    return true ;
      default:
    return super.onKeyUp(keyCode, event) ;
      }
    }
    
    private void sendUDPPacket(String s)
    {
  try {
      DatagramSocket ds = new DatagramSocket() ;
      
      InetAddress addr = InetAddress.getByName("192.168.99.154") ;
      DatagramPacket dp = new DatagramPacket(s.getBytes(),
           s.length(), addr, 2121) ;

      ds.send(dp) ;
  }catch (Exception e)
      {
    e.printStackTrace() ;
      }
    }

    private void startDownloadFile(String urlStr, String fileName, boolean bNotify)
    {
  Log.v("DownloadActivity", "startDownloadFile fileName(" + 
        fileName + ") urlstr(" + urlStr + ")") ;

  Uri uri = Uri.parse(urlStr) ;
  DownloadManager.Request request = new Request(uri) ;
  request.setVisibleInDownloadsUi(bNotify) ;

  if (!bNotify) {
      request.setNotificationVisibility(
        DownloadManager.Request.VISIBILITY_HIDDEN) ;
  }

  request.setDestinationInExternalPublicDir("music-app", fileName) ;
  request.setAllowedNetworkTypes(Request.NETWORK_WIFI) ;

  DownloadManager dm = (DownloadManager)getSystemService(
             Context.DOWNLOAD_SERVICE) ;

  dm.enqueue(request) ;
    }
}

Java Source Code List

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