package com.ntp.service;
import android.app.IntentService;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.content.Context;
import android.graphics.BitmapFactory;
import android.support.v4.app.NotificationCompat;
import android.util.Log;
import com.ntp.ui.R;
import com.ntp.ui.course.CoursewareFragment;
import com.ntp.util.SDCardUtil;
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.ProtocolException;
import java.net.URL;
/**
* 下载服务，异步处理
*/
public class DownloadService extends IntentService {
//下载动作
private static final String ACTION_DOWNLOAD = "com.ntp.action.download";
private static final String EXTRA_PARAM1 = "com.ntp.extra.PARAM1";
private static final String EXTRA_PARAM2 = "com.ntp.extra.PARAM2";
private static final String EXTRA_PARAM3 = "com.ntp.extra.PARAM3";
private static final String TAG = "DownLoadService";
private File saveFile;// 下载的数据保存到的文件
private static boolean downloadPause;//暂停下载标识
private int fileSize;//文件大小
private int downloadLength;//已经下载的文件大小
private String fileName;//文件名
private static int id=1;
private NotificationManager manager;
private NotificationCompat.Builder builder;
/**
* 下载文件
*
* @param downloadPath 文件下载路径
* @param newFileName 文件新名称。如果为null，将采用URL文件名称
* @param fileSaveDir 下载保存路径保存
*/
public static void startActionDownload(Context context, String downloadPath, String newFileName, String fileSaveDir) {
Intent intent = new Intent(context, DownloadService.class);
intent.setAction(ACTION_DOWNLOAD);
intent.putExtra(EXTRA_PARAM1, downloadPath);
intent.putExtra(EXTRA_PARAM2, newFileName);
intent.putExtra(EXTRA_PARAM3, fileSaveDir);
context.startService(intent);
}
public DownloadService() {
super(TAG);
}
@Override
protected void onHandleIntent(Intent intent) {
if (intent != null) {
final String action = intent.getAction();
if (ACTION_DOWNLOAD.equals(action)) {
id+=1;
final String downloadPath = intent.getStringExtra(EXTRA_PARAM1);
final String newFileName = intent.getStringExtra(EXTRA_PARAM2);
final String fileSaveDir = intent.getStringExtra(EXTRA_PARAM3);
handlerActionDownload(downloadPath, newFileName, fileSaveDir);
}
}
}
/**
* @param downloadPath 文件下载路径
* @param newFileName 文件新名称。如果为null，将采用URL文件名称
* @param fileSaveDir 下载保存路径保存
*/
private void handlerActionDownload(String downloadPath, String newFileName, String fileSaveDir) {
if (!SDCardUtil.checkSDCard()) {
Log.i(TAG, "SD不存在");
return;
}
try {
// 获取通知服务
manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
builder = new NotificationCompat.Builder(
getApplicationContext());
Log.d(TAG,manager.toString());
URL url = new URL(downloadPath);// 根据下载路径实例化URL
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(5 * 1000);
conn.setRequestMethod("GET");
conn.setRequestProperty("Charset", "UTF-8");
conn.setRequestProperty("Connection", "Keep-Alive");
if (conn.getResponseCode() == 200) {//响应成功
fileSize = conn.getContentLength();// 根据相应获取文件大小
fileName = newFileName == null ? downloadPath.substring(downloadPath
.lastIndexOf('/') + 1) : newFileName;
File file=new File(fileSaveDir);
file.mkdir();
saveFile = new File(fileSaveDir, fileName);
saveFile.createNewFile();
Log.i(TAG, saveFile.toString());
InputStream inStream = conn.getInputStream();// 获取远程连接的输入流
byte[] buffer = new byte[1024];
int offset = 0;
RandomAccessFile randomAccessFile = new RandomAccessFile(
this.saveFile, "rwd");
randomAccessFile.seek(0);
Log.d(TAG,downloadPause+"");
// 当用户没有要求停止下载，同时没有到达请求数据的末尾时候会一直循环读取数据
while (!isDownloadPause()
&& (offset = inStream.read(buffer, 0, 1024)) != -1) {
randomAccessFile.write(buffer, 0, offset);
Log.i(TAG, randomAccessFile.getFilePointer() + "");
downloadLength += offset;
// 发送进度广播
Intent sendIntent = new Intent(CoursewareFragment.ACTION_UPDATE);
//下载进度
sendIntent.putExtra("fileSize",fileSize);
sendIntent.putExtra("downloadLength", downloadLength);
Log.i(TAG, "DownloadService id=" + id);
sendBroadcast(sendIntent);
showProgressBar(fileSize,downloadLength);
}
if (isDownloadPause()){
builder.setTicker(fileName + "取消下载");
manager.notify(id, builder.build());
manager.cancel(id);
}else {
// 发送下载完成广播
Intent sendIntent = new Intent(CoursewareFragment.ACTION_FINISH);
sendIntent.putExtra("success", true);
sendIntent.putExtra("fileName",fileName);
sendBroadcast(sendIntent);
}
randomAccessFile.close();
inStream.close();
} else {
Log.i(TAG, "服务器响应异常");
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (ProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 通知栏显示下载进度
* @param fileSize 文件总大小
* @param downloadLength 当前下载大小
*/
private void showProgressBar(final int fileSize, final int downloadLength) {
builder.setLargeIcon(BitmapFactory.decodeResource(getResources(),R.drawable.ic_launcher)).setSmallIcon(R.drawable.download)
.setTicker(fileName + "开始下载...").setContentInfo((downloadLength * 100 / fileSize) + "%")
.setOngoing(true).setContentTitle("ntp")
.setContentText(fileName + "正在下载").setAutoCancel(true)
//点击通知栏取消
.setContentIntent(PendingIntent.getActivity(getApplicationContext(), 0, new Intent(), 0));
if (fileSize==downloadLength){//下载完成
builder.setContentText(fileName+"下载完成");
}
builder.setProgress(fileSize, downloadLength, false);
manager.notify(id, builder.build());
}
/**
* 获取当前下载状态
*
* @return true 取消，false不取消
*/
public boolean isDownloadPause() {
return downloadPause;
}
/**
* 设置暂停下载，false不取消，true取消
*
* @param downloadPause
*/
public void setDownloadPause(boolean downloadPause) {
this.downloadPause = downloadPause;
}
}