Java tutorial
/* * Copyright (C) 2014 The AppCan Open Source Project. * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * You should have received a copy of the GNU Lesser General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. * */ package org.zywx.wbpalmstar.engine; import java.io.File; import java.io.FileOutputStream; import java.io.InputStream; import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.URL; import org.apache.http.cookie.SM; import org.apache.http.protocol.HTTP; import android.app.ProgressDialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.net.Uri; import android.os.Environment; import android.os.Handler; import android.os.Message; import android.webkit.CookieManager; import android.webkit.MimeTypeMap; import android.widget.Toast; public class EDownloadDialog extends ProgressDialog implements Runnable { public URL mClient; public HttpURLConnection mConnection; public InputStream mInStream; private String url; public String userAgent; public String contentDisposition; public String mimetype; public long contentLength; public File mTmpFile; public boolean mFromStop; public ECallback mCallBack; public EDownloadDialog(Context context, String url) { super(context); init(url); } public EDownloadDialog(Context context, int theme, String url) { super(context, theme); init(url); } public void setDoneCallback(ECallback callback) { mCallBack = callback; } private void init(String inUrl) { url = inUrl; String suffix = makeFileSuffix(url); MimeTypeMap mtm = MimeTypeMap.getSingleton(); mimetype = mtm.getMimeTypeFromExtension(suffix); if (null == mimetype) { } setProgress(0); setIcon(EResources.icon); setCancelable(false); setTitle(""); setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); setMax(100); setButton("?", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { mFromStop = true; stopDownload(); } }); } @Override public void show() { super.show(); new Thread(this).start(); } private void stopDownload() { dismiss(); try { if (null != mInStream) { mInStream.close(); } if (null != mConnection) { mConnection.disconnect(); } } catch (Exception e) { e.printStackTrace(); } if (null != mCallBack) { mCallBack.callback(null); } } private Handler mProgressHandler = new Handler() { @Override public void handleMessage(Message msg) { setProgress(msg.what); if (100 == msg.what) { sendEmptyMessageDelayed(-1, 1000); } else if (-1 == msg.what) { downloadDone(); } else if (-2 == msg.what) { Toast.makeText(getContext(), (String) msg.obj, Toast.LENGTH_SHORT).show(); } else if (-3 == msg.what) { stopDownload(); } } }; @Override public void run() { try { if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { mProgressHandler.sendMessage(mProgressHandler.obtainMessage(-2, "SD?!")); mProgressHandler.sendEmptyMessage(-3); return; } mClient = new URL(url); mConnection = (HttpURLConnection) mClient.openConnection(); mConnection.setRequestMethod("GET"); mConnection.setRequestProperty("Accept-Encoding", "gzip, deflate"); String cookie = getCookie(url); if (null != cookie) { mConnection.setRequestProperty(SM.COOKIE, cookie); } mConnection.setUseCaches(false); mConnection.setRequestProperty("Connection", "Keep-Alive"); mConnection.setRequestProperty("Charset", HTTP.UTF_8); mConnection.setRequestProperty("User-Agent", EBrowserSetting.USERAGENT); mConnection.setReadTimeout(1000 * 30); mConnection.setConnectTimeout(1000 * 30); mConnection.setInstanceFollowRedirects(false); mConnection.connect(); int responseCode = mConnection.getResponseCode(); if (200 == responseCode) { saveToFile(); } else { mProgressHandler.sendMessage(mProgressHandler.obtainMessage(-2, ",?!")); mProgressHandler.sendEmptyMessage(-3); } } catch (Exception e) { e.printStackTrace(); if (!mFromStop) { mProgressHandler.sendMessage(mProgressHandler.obtainMessage(-2, ",?!")); } mProgressHandler.sendEmptyMessage(-3); } } private int downLoaderSise = 0; private void saveToFile() throws Exception { mInStream = mConnection.getInputStream(); if (mInStream == null) { return; } if (contentLength <= 0) { String cLength = mConnection.getHeaderField("Content-Length"); if (cLength != null) { contentLength = Long.parseLong(cLength); } } MimeTypeMap mtm = MimeTypeMap.getSingleton(); String extension = mtm.getExtensionFromMimeType(mimetype); File tm = Environment.getExternalStorageDirectory(); File target = new File(tm.getAbsoluteFile() + "/Download/"); if (!target.exists()) { target.mkdirs(); } mTmpFile = File.createTempFile("/Download/", "." + extension, tm); OutputStream outStream = new FileOutputStream(mTmpFile); byte buffer[] = new byte[1024 * 3]; while (true) { int numread = mInStream.read(buffer); if (numread == -1) { mProgressHandler.sendEmptyMessage(100); break; } outStream.write(buffer, 0, numread); downLoaderSise += numread; int p = (int) (((float) downLoaderSise / contentLength) * 100); mProgressHandler.sendEmptyMessage(p); } if (contentLength <= 0) { mProgressHandler.sendEmptyMessage(100); } } private void downloadDone() { stopDownload(); Intent installIntent = new Intent(Intent.ACTION_VIEW); String filename = mTmpFile.getAbsolutePath(); Uri path = Uri.parse(filename); if (path.getScheme() == null) { path = Uri.fromFile(new File(filename)); } installIntent.setDataAndType(path, mimetype); installIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); try { getContext().startActivity(installIntent); } catch (Exception e) { e.printStackTrace(); mProgressHandler.sendMessage(mProgressHandler.obtainMessage(-2, "?")); } } private String makeFileSuffix(String url) { int index = url.lastIndexOf("."); if (index < 0) { return null; } return url.substring(index + 1); } private final String getCookie(String inUrl) { return CookieManager.getInstance().getCookie(inUrl); } }