Android 开发之文件下载，状态时显示下载进度，点击自动安装 Android, 文件下载, import, 开发

我是MT

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：

• 001
• package com.channelsoft.ahzyfis.util;
• 002
• 003
• import java.io.File;
• 004
• import java.io.FileOutputStream;
• 005
• import java.io.InputStream;
• 006
• import java.net.HttpURLConnection;
• 007
• import java.net.URL;
• 008
• 009
• import android.app.Notification;
• 010
• import android.app.NotificationManager;
• 011
• import android.app.PendingIntent;
• 012
• import android.content.Context;
• 013
• import android.content.Intent;
• 014
• import android.net.Uri;
• 015
• import android.os.Environment;
• 016
• import android.os.Handler;
• 017
• import android.os.Message;
• 018
• import android.util.Log;
• 019
• import android.widget.RemoteViews;
• 020
• import android.widget.Toast;
• 021
• 022
• import com.channelsoft.ahzyfis.AhzyFisActivity;
• 023
• import com.channelsoft.ahzyfis.R;
• 024
• 025
• 037
• public class AppFileDownUtils extends Thread {
• 038
• 039
• private Context mContext;
• 040
• private Handler mHandler;
• 041
• private String mDownloadUrl; // 文件下载url，已做非空检查
• 042
• private String mFileName;
• 043
• private Message msg;
• 044
• 045
• private final String APP_FOLDER = "DownDemo"; // sd卡应用目录
• 046
• private final String APK_FOLDER = "apkFile"; // 下载apk文件目录
• 047
• 048
• public static final int MSG_UNDOWN = 0; //未开始下载
• 049
• public static final int MSG_DOWNING = 1; // 下载中
• 050
• public static final int MSG_FINISH = 1; // 下载完成
• 051
• public static final int MSG_FAILURE = 2;// 下载失败
• 052
• 053
• private NotificationManager mNotifManager;
• 054
• private Notification mDownNotification;
• 055
• private RemoteViews mContentView; // 下载进度View
• 056
• private PendingIntent mDownPendingIntent;
• 057
• 058
• public AppFileDownUtils(Context context, Handler handler,
• 059
• String downloadUrl, String fileName) {
• 060
• mContext = context;
• 061
• mHandler = handler;
• 062
• mDownloadUrl = downloadUrl;
• 063
• mFileName = fileName;
• 064
• mNotifManager = (NotificationManager) mContext
• 065
• .getSystemService(Context.NOTIFICATION_SERVICE);
• 066
• msg = new Message();
• 067
• }
• 068
• 069
• @Override
• 070
• public void run() {
• 071
• try {
• 072
• if (Environment.getExternalStorageState().equals(
• 073
• Environment.MEDIA_MOUNTED)) {
• 074
• Message downingMsg = new Message();
• 075
• downingMsg.what = MSG_DOWNING;
• 076
• mHandler.sendMessage(downingMsg);
• 077
• // SD卡准备好
• 078
• File sdcardDir = Environment.getExternalStorageDirectory();
• 079
• // 文件存放路径： sdcard/DownDemo/apkFile
• 080
• File folder = new File(sdcardDir + File.separator + APP_FOLDER
• 081
• + File.separator + APK_FOLDER);
• 082
• if (!folder.exists()) {
• 083
• //创建存放目录
• 084
• folder.mkdir();
• 085
• }
• 086
• File saveFilePath = new File(folder, mFileName);
• 087
• System.out.println(saveFilePath);
• 088
• mDownNotification = new Notification(
• 089
• android.R.drawable.stat_sys_download, mContext
• 090
• .getString(R.string.notif_down_file), System
• 091
• .currentTimeMillis());
• 092
• mDownNotification.flags = Notification.FLAG_ONGOING_EVENT;
• 093
• mDownNotification.flags = Notification.FLAG_AUTO_CANCEL;
• 094
• mContentView = new RemoteViews(mContext.getPackageName(),
• 095
• R.layout.custom_notification);
• 096
• mContentView.setImageViewResource(R.id.downLoadIcon,
• 097
• android.R.drawable.stat_sys_download);
• 098
• mDownPendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(), 0);
• 099
• boolean downSuc = downloadFile(mDownloadUrl, saveFilePath);
• 100
• if (downSuc) {
• 101
• msg.what = MSG_FINISH;
• 102
• Notification notification = new Notification(
• 103
• android.R.drawable.stat_sys_download_done, mContext
• 104
• .getString(R.string.downloadSuccess),
• 105
• System.currentTimeMillis());
• 106
• notification.flags = Notification.FLAG_ONGOING_EVENT;
• 107
• notification.flags = Notification.FLAG_AUTO_CANCEL;
• 108
• Intent intent = new Intent(Intent.ACTION_VIEW);
• 109
• intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
• 110
• intent.setDataAndType(Uri.fromFile(saveFilePath),
• 111
• "application/vnd.android.package-archive");
• 112
• PendingIntent contentIntent = PendingIntent.getActivity(
• 113
• mContext, 0, intent, 0);
• 114
• notification.setLatestEventInfo(mContext, mContext
• 115
• .getString(R.string.downloadSuccess), null,
• 116
• contentIntent);
• 117
• mNotifManager.notify(R.drawable.icon, notification);
• 118
• } else {
• 119
• msg.what = MSG_FAILURE;
• 120
• Notification notification = new Notification(
• 121
• android.R.drawable.stat_sys_download_done, mContext
• 122
• .getString(R.string.downloadFailure),
• 123
• System.currentTimeMillis());
• 124
• notification.flags = Notification.FLAG_AUTO_CANCEL;
• 125
• PendingIntent contentIntent = PendingIntent.getActivity(
• 126
• mContext, 0, new Intent(), 0);
• 127
• notification.setLatestEventInfo(mContext, mContext
• 128
• .getString(R.string.downloadFailure), null,
• 129
• contentIntent);
• 130
• mNotifManager.notify(R.drawable.icon, notification);
• 131
• }
• 132
• 133
• } else {
• 134
• Toast.makeText(mContext, Environment.getExternalStorageState(),
• 135
• Toast.LENGTH_SHORT).show();
• 136
• msg.what = MSG_FAILURE;
• 137
• }
• 138
• } catch (Exception e) {
• 139
• Log.e(AhzyFisActivity.TAG, "AppFileDownUtils catch Exception:", e);
• 140
• msg.what = MSG_FAILURE;
• 141
• } finally {
• 142
• mHandler.sendMessage(msg);
• 143
• }
• 144
• }
• 145
• 146
• 156
• public boolean downloadFile(String downloadUrl, File saveFilePath) {
• 157
• int fileSize = -1;
• 158
• int downFileSize = 0;
• 159
• boolean result = false;
• 160
• int progress = 0;
• 161
• try {
• 162
• URL url = new URL(downloadUrl);
• 163
• HttpURLConnection conn = (HttpURLConnection) url.openConnection();
• 164
• if (null == conn) {
• 165
• return false;
• 166
• }
• 167
• // 读取超时时间 毫秒级
• 168
• conn.setReadTimeout(10000);
• 169
• conn.setRequestMethod("GET");
• 170
• conn.setDoInput(true);
• 171
• conn.connect();
• 172
• if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
• 173
• fileSize = conn.getContentLength();
• 174
• InputStream is = conn.getInputStream();
• 175
• FileOutputStream fos = new FileOutputStream(saveFilePath);
• 176
• byte[] buffer = new byte[1024];
• 177
• int i = 0;
• 178
• int tempProgress = -1;
• 179
• while ((i = is.read(buffer)) != -1) {
• 180
• downFileSize = downFileSize + i;
• 181
• // 下载进度
• 182
• progress = (int) (downFileSize * 100.0 / fileSize);
• 183
• fos.write(buffer, 0, i);
• 184
• 185
• synchronized (this) {
• 186
• if (downFileSize == fileSize) {
• 187
• // 下载完成
• 188
• mNotifManager.cancel(R.id.downLoadIcon);
• 189
• } else if (tempProgress != progress) {
• 190
• // 下载进度发生改变，则发送Message
• 191
• mContentView.setTextViewText(R.id.progressPercent,
• 192
• progress + "%");
• 193
• mContentView.setProgressBar(R.id.downLoadProgress,
• 194
• 100, progress, false);
• 195
• mDownNotification.contentView = mContentView;
• 196
• mDownNotification.contentIntent = mDownPendingIntent;
• 197
• mNotifManager.notify(R.id.downLoadIcon,
• 198
• mDownNotification);
• 199
• tempProgress = progress;
• 200
• }
• 201
• }
• 202
• }
• 203
• fos.flush();
• 204
• fos.close();
• 205
• is.close();
• 206
• result = true;
• 207
• } else {
• 208
• result = false;
• 209
• }
• 210
• } catch (Exception e) {
• 211
• result = false;
• 212
• Log.e(AhzyFisActivity.TAG, "downloadFile catch Exception:", e);
• 213
• }
• 214
• return result;
• 215
• }
• 216
• }

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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
进度条显示的布局文件如下：
查看源码打印?

• 01
• 02
• 03
• android:id="@+id/custom_notification"
• 04
• xmlns:android="http://schemas.android.com/apk/res/android"
• 05
• androidrientation="horizontal"
• 06
• android:layout_width="fill_parent"
• 07
• android:layout_height="fill_parent">
• 08
• 09
• android:id="@+id/downLoadIcon"
• 10
• android:layout_width="wrap_content"
• 11
• android:layout_height="wrap_content"
• 12
• android:layout_marginLeft="5dip"
• 13
• android:layout_gravity="center_vertical"
• 14
• />
• 15
• 16
• android:layout_height="fill_parent"
• 17
• android:layout_width="wrap_content"
• 18
• android:layout_marginLeft="5dip"
• 19
• android:text="@string/downloadProgress"
• 20
• android:gravity="center_vertical"
• 21
• />
• 22
• 23
• android:id="@+id/downLoadProgress"
• 24
• style="?android:attr/progressBarStyleHorizontal"
• 25
• mce_style="?android:attr/progressBarStyleHorizontal"
• 26
• android:layout_marginLeft="10dip"
• 27
• android:layout_width="150dip"
• 28
• android:layout_height="wrap_content"
• 29
• android:layout_gravity="center_vertical"
• 30
• />
• 31
• 32
• android:id="@+id/progressPercent"
• 33
• android:layout_height="fill_parent"
• 34
• android:layout_width="wrap_content"
• 35
• android:layout_marginLeft="5dip"
• 36
• android:gravity="center_vertical"
• 37
• />
• 38

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