• 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：

     

    [java]  view plain copy
     
    1. package com.channelsoft.ahzyfis.util;  
    2.   
    3. import java.io.File;  
    4. import java.io.FileOutputStream;  
    5. import java.io.InputStream;  
    6. import java.net.HttpURLConnection;  
    7. import java.net.URL;  
    8.   
    9. import android.app.Notification;  
    10. import android.app.NotificationManager;  
    11. import android.app.PendingIntent;  
    12. import android.content.Context;  
    13. import android.content.Intent;  
    14. import android.net.Uri;  
    15. import android.os.Environment;  
    16. import android.os.Handler;  
    17. import android.os.Message;  
    18. import android.util.Log;  
    19. import android.widget.RemoteViews;  
    20. import android.widget.Toast;  
    21.   
    22. import com.channelsoft.ahzyfis.AhzyFisActivity;  
    23. import com.channelsoft.ahzyfis.R;  
    24.   
    25. /** 
    26.  *  
    27.  * <dl> 
    28.  * <dt>AppFileDownUtils.java</dt> 
    29.  * <dd>Description: 文件下载</dd> 
    30.  * <dd>Copyright: Copyright (C) 2011</dd> 
    31.  * <dd>Company: </dd> 
    32.  * <dd>CreateDate: 2011-10-19</dd> 
    33.  * </dl> 
    34.  *  
    35.  * @author ZhanHua 
    36.  */  
    37. public class AppFileDownUtils extends Thread {  
    38.   
    39.     private Context mContext;  
    40.     private Handler mHandler;  
    41.     private String mDownloadUrl; // 文件下载url，已做非空检查  
    42.     private String mFileName;  
    43.     private Message msg;  
    44.   
    45.     private final String APP_FOLDER = "DownDemo"; // sd卡应用目录  
    46.     private final String APK_FOLDER = "apkFile"; // 下载apk文件目录  
    47.   
    48.     public static final int MSG_UNDOWN = 0; //未开始下载  
    49.     public static final int MSG_DOWNING = 1; // 下载中  
    50.     public static final int MSG_FINISH = 1; // 下载完成  
    51.     public static final int MSG_FAILURE = 2;// 下载失败  
    52.   
    53.     private NotificationManager mNotifManager;  
    54.     private Notification mDownNotification;  
    55.     private RemoteViews mContentView; // 下载进度View  
    56.     private PendingIntent mDownPendingIntent;  
    57.   
    58.     public AppFileDownUtils(Context context, Handler handler,  
    59.             String downloadUrl, String fileName) {  
    60.         mContext = context;  
    61.         mHandler = handler;  
    62.         mDownloadUrl = downloadUrl;  
    63.         mFileName = fileName;  
    64.         mNotifManager = (NotificationManager) mContext  
    65.                 .getSystemService(Context.NOTIFICATION_SERVICE);  
    66.         msg = new Message();  
    67.     }  
    68.   
    69.     @Override  
    70.     public void run() {  
    71.         try {  
    72.             if (Environment.getExternalStorageState().equals(  
    73.                     Environment.MEDIA_MOUNTED)) {  
    74.                 Message downingMsg = new Message();  
    75.                 downingMsg.what = MSG_DOWNING;  
    76.                 mHandler.sendMessage(downingMsg);  
    77.                 // SD卡准备好  
    78.                 File sdcardDir = Environment.getExternalStorageDirectory();  
    79.                 // 文件存放路径： sdcard/DownDemo/apkFile  
    80.                 File folder = new File(sdcardDir + File.separator + APP_FOLDER  
    81.                         + File.separator + APK_FOLDER);  
    82.                 if (!folder.exists()) {  
    83.                     //创建存放目录  
    84.                     folder.mkdir();  
    85.                 }  
    86.                 File saveFilePath = new File(folder, mFileName);  
    87.                 System.out.println(saveFilePath);  
    88.                 mDownNotification = new Notification(  
    89.                         android.R.drawable.stat_sys_download, mContext  
    90.                                 .getString(R.string.notif_down_file), System  
    91.                                 .currentTimeMillis());  
    92.                 mDownNotification.flags = Notification.FLAG_ONGOING_EVENT;  
    93.                 mDownNotification.flags = Notification.FLAG_AUTO_CANCEL;  
    94.                 mContentView = new RemoteViews(mContext.getPackageName(),  
    95.                         R.layout.custom_notification);  
    96.                 mContentView.setImageViewResource(R.id.downLoadIcon,  
    97.                         android.R.drawable.stat_sys_download);  
    98.                 mDownPendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(), 0);  
    99.                 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.     /** 
    147.      *  
    148.      * Desc:文件下载 
    149.      *  
    150.      * @param downloadUrl 
    151.      *            下载URL 
    152.      * @param saveFilePath 
    153.      *            保存文件路径 
    154.      * @return ture:下载成功 false:下载失败 
    155.      */  
    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. }  

    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：

     

    [html]  view plain copy
     
    1. <?xml version="1.0" encoding="utf-8"?>  
    2. <LinearLayout  
    3.   android:id="@+id/custom_notification"  
    4.   xmlns:android="http://schemas.android.com/apk/res/android"  
    5.   android:orientation="horizontal"  
    6.   android:layout_width="fill_parent"  
    7.   android:layout_height="fill_parent">  
    8.     <ImageView  
    9.         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.     <TextView  
    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.     <ProgressBar  
    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.     <TextView  
    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. </LinearLayout>  
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  • 原文地址：https://www.cnblogs.com/riskyer/p/3293892.html
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