Android开发之文件下载，状态时显示下载进度，点击自动安装

在进行软件升级时，需要进行文件下载，在这里实现自定义的文件下载，并在状态栏显示下载进度，下载完成后，点击触发安装。

效果如图：

用于下载文件和显示现在进度的线程类如下：

package com.channelsoft.ahzyfis.util; import java.io.File; import java.io.FileOutputStream; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.URL; import android.app.Notification; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.Context; import android.content.Intent; import android.net.Uri; import android.os.Environment; import android.os.Handler; import android.os.Message; import android.util.Log; import android.widget.RemoteViews; import android.widget.Toast; import com.channelsoft.ahzyfis.AhzyFisActivity; import com.channelsoft.ahzyfis.R; /** * * <dl> * <dt>AppFileDownUtils.java</dt> * <dd>Description: 文件下载</dd> * <dd>Copyright: Copyright (C) 2011</dd> * <dd>Company: </dd> * <dd>CreateDate: 2011-10-19</dd> * </dl> * * @author ZhanHua */ public class AppFileDownUtils extends Thread { private Context mContext; private Handler mHandler; private String mDownloadUrl; // 文件下载url，已做非空检查 private String mFileName; private Message msg; private final String APP_FOLDER = "DownDemo"; // sd卡应用目录 private final String APK_FOLDER = "apkFile"; // 下载apk文件目录 public static final int MSG_UNDOWN = 0; //未开始下载 public static final int MSG_DOWNING = 1; // 下载中 public static final int MSG_FINISH = 1; // 下载完成 public static final int MSG_FAILURE = 2;// 下载失败 private NotificationManager mNotifManager; private Notification mDownNotification; private RemoteViews mContentView; // 下载进度View private PendingIntent mDownPendingIntent; public AppFileDownUtils(Context context, Handler handler, String downloadUrl, String fileName) { mContext = context; mHandler = handler; mDownloadUrl = downloadUrl; mFileName = fileName; mNotifManager = (NotificationManager) mContext .getSystemService(Context.NOTIFICATION_SERVICE); msg = new Message(); } @Override public void run() { try { if (Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED)) { Message downingMsg = new Message(); downingMsg.what = MSG_DOWNING; mHandler.sendMessage(downingMsg); // SD卡准备好 File sdcardDir = Environment.getExternalStorageDirectory(); // 文件存放路径： sdcard/DownDemo/apkFile File folder = new File(sdcardDir + File.separator + APP_FOLDER + File.separator + APK_FOLDER); if (!folder.exists()) { //创建存放目录 folder.mkdir(); } File saveFilePath = new File(folder, mFileName); System.out.println(saveFilePath); mDownNotification = new Notification( android.R.drawable.stat_sys_download, mContext .getString(R.string.notif_down_file), System .currentTimeMillis()); mDownNotification.flags = Notification.FLAG_ONGOING_EVENT; mDownNotification.flags = Notification.FLAG_AUTO_CANCEL; mContentView = new RemoteViews(mContext.getPackageName(), R.layout.custom_notification); mContentView.setImageViewResource(R.id.downLoadIcon, android.R.drawable.stat_sys_download); mDownPendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(), 0); boolean downSuc = downloadFile(mDownloadUrl, saveFilePath); if (downSuc) { msg.what = MSG_FINISH; Notification notification = new Notification( android.R.drawable.stat_sys_download_done, mContext .getString(R.string.downloadSuccess), System.currentTimeMillis()); notification.flags = Notification.FLAG_ONGOING_EVENT; notification.flags = Notification.FLAG_AUTO_CANCEL; Intent intent = new Intent(Intent.ACTION_VIEW); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); intent.setDataAndType(Uri.fromFile(saveFilePath), "application/vnd.android.package-archive"); PendingIntent contentIntent = PendingIntent.getActivity( mContext, 0, intent, 0); notification.setLatestEventInfo(mContext, mContext .getString(R.string.downloadSuccess), null, contentIntent); mNotifManager.notify(R.drawable.icon, notification); } else { msg.what = MSG_FAILURE; Notification notification = new Notification( android.R.drawable.stat_sys_download_done, mContext .getString(R.string.downloadFailure), System.currentTimeMillis()); notification.flags = Notification.FLAG_AUTO_CANCEL; PendingIntent contentIntent = PendingIntent.getActivity( mContext, 0, new Intent(), 0); notification.setLatestEventInfo(mContext, mContext .getString(R.string.downloadFailure), null, contentIntent); mNotifManager.notify(R.drawable.icon, notification); } } else { Toast.makeText(mContext, Environment.getExternalStorageState(), Toast.LENGTH_SHORT).show(); msg.what = MSG_FAILURE; } } catch (Exception e) { Log.e(AhzyFisActivity.TAG, "AppFileDownUtils catch Exception:", e); msg.what = MSG_FAILURE; } finally { mHandler.sendMessage(msg); } } /** * * Desc:文件下载 * * @param downloadUrl * 下载URL * @param saveFilePath * 保存文件路径 * @return ture:下载成功 false:下载失败 */ public boolean downloadFile(String downloadUrl, File saveFilePath) { int fileSize = -1; int downFileSize = 0; boolean result = false; int progress = 0; try { URL url = new URL(downloadUrl); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); if (null == conn) { return false; } // 读取超时时间 毫秒级 conn.setReadTimeout(10000); conn.setRequestMethod("GET"); conn.setDoInput(true); conn.connect(); if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) { fileSize = conn.getContentLength(); InputStream is = conn.getInputStream(); FileOutputStream fos = new FileOutputStream(saveFilePath); byte[] buffer = new byte[1024]; int i = 0; int tempProgress = -1; while ((i = is.read(buffer)) != -1) { downFileSize = downFileSize + i; // 下载进度 progress = (int) (downFileSize * 100.0 / fileSize); fos.write(buffer, 0, i); synchronized (this) { if (downFileSize == fileSize) { // 下载完成 mNotifManager.cancel(R.id.downLoadIcon); } else if (tempProgress != progress) { // 下载进度发生改变，则发送Message mContentView.setTextViewText(R.id.progressPercent, progress + "%"); mContentView.setProgressBar(R.id.downLoadProgress, 100, progress, false); mDownNotification.contentView = mContentView; mDownNotification.contentIntent = mDownPendingIntent; mNotifManager.notify(R.id.downLoadIcon, mDownNotification); tempProgress = progress; } } } fos.flush(); fos.close(); is.close(); result = true; } else { result = false; } } catch (Exception e) { result = false; Log.e(AhzyFisActivity.TAG, "downloadFile catch Exception:", e); } return result; } }在下载过程中，如果需要和主线程（UI Main Thread）通信，及时让主线程了解下载进度和状态，可用通过Handle向主线程发送Message