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：
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package com.channelsoft.ahzyfis.util;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.InputStream;
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import java.net.HttpURLConnection;
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import java.net.URL;
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import android.app.Notification;
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import android.app.NotificationManager;
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import android.app.PendingIntent;
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import android.content.Context;
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import android.content.Intent;
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import android.net.Uri;
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import android.os.Environment;
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import android.os.Handler;
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import android.os.Message;
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import android.util.Log;
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import android.widget.RemoteViews;
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import android.widget.Toast;
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import com.channelsoft.ahzyfis.AhzyFisActivity;
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import com.channelsoft.ahzyfis.R;
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public class AppFileDownUtils extends Thread {
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private Context mContext;
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private Handler mHandler;
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private String mDownloadUrl; // 文件下载url，已做非空检查
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private String mFileName;
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private Message msg;
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private final String APP_FOLDER = "DownDemo"; // sd卡应用目录
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private final String APK_FOLDER = "apkFile"; // 下载apk文件目录
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public static final int MSG_UNDOWN = 0; //未开始下载
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public static final int MSG_DOWNING = 1; // 下载中
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public static final int MSG_FINISH = 1; // 下载完成
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public static final int MSG_FAILURE = 2;// 下载失败
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private NotificationManager mNotifManager;
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private Notification mDownNotification;
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private RemoteViews mContentView; // 下载进度View
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private PendingIntent mDownPendingIntent;
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public AppFileDownUtils(Context context, Handler handler,
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String downloadUrl, String fileName) {
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mContext = context;
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mHandler = handler;
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mDownloadUrl = downloadUrl;
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mFileName = fileName;
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mNotifManager = (NotificationManager) mContext
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.getSystemService(Context.NOTIFICATION_SERVICE);
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msg = new Message();
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}
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@Override
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public void run() {
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try {
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if (Environment.getExternalStorageState().equals(
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Environment.MEDIA_MOUNTED)) {
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Message downingMsg = new Message();
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downingMsg.what = MSG_DOWNING;
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mHandler.sendMessage(downingMsg);
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// SD卡准备好
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File sdcardDir = Environment.getExternalStorageDirectory();
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// 文件存放路径： sdcard/DownDemo/apkFile
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File folder = new File(sdcardDir + File.separator + APP_FOLDER
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+ File.separator + APK_FOLDER);
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if (!folder.exists()) {
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//创建存放目录
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folder.mkdir();
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}
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File saveFilePath = new File(folder, mFileName);
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System.out.println(saveFilePath);
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mDownNotification = new Notification(
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android.R.drawable.stat_sys_download, mContext
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.getString(R.string.notif_down_file), System
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.currentTimeMillis());
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mDownNotification.flags = Notification.FLAG_ONGOING_EVENT;
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mDownNotification.flags = Notification.FLAG_AUTO_CANCEL;
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mContentView = new RemoteViews(mContext.getPackageName(),
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R.layout.custom_notification);
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mContentView.setImageViewResource(R.id.downLoadIcon,
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android.R.drawable.stat_sys_download);
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mDownPendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(), 0);
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boolean downSuc = downloadFile(mDownloadUrl, saveFilePath);
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if (downSuc) {
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msg.what = MSG_FINISH;
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Notification notification = new Notification(
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android.R.drawable.stat_sys_download_done, mContext
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.getString(R.string.downloadSuccess),
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System.currentTimeMillis());
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notification.flags = Notification.FLAG_ONGOING_EVENT;
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notification.flags = Notification.FLAG_AUTO_CANCEL;
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Intent intent = new Intent(Intent.ACTION_VIEW);
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intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
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intent.setDataAndType(Uri.fromFile(saveFilePath),
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"application/vnd.android.package-archive");
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PendingIntent contentIntent = PendingIntent.getActivity(
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mContext, 0, intent, 0);
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notification.setLatestEventInfo(mContext, mContext
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.getString(R.string.downloadSuccess), null,
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contentIntent);
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mNotifManager.notify(R.drawable.icon, notification);
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} else {
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msg.what = MSG_FAILURE;
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Notification notification = new Notification(
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android.R.drawable.stat_sys_download_done, mContext
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.getString(R.string.downloadFailure),
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System.currentTimeMillis());
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notification.flags = Notification.FLAG_AUTO_CANCEL;
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PendingIntent contentIntent = PendingIntent.getActivity(
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mContext, 0, new Intent(), 0);
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notification.setLatestEventInfo(mContext, mContext
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.getString(R.string.downloadFailure), null,
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contentIntent);
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mNotifManager.notify(R.drawable.icon, notification);
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}
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} else {
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Toast.makeText(mContext, Environment.getExternalStorageState(),
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Toast.LENGTH_SHORT).show();
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msg.what = MSG_FAILURE;
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}
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} catch (Exception e) {
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Log.e(AhzyFisActivity.TAG, "AppFileDownUtils catch Exception:", e);
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msg.what = MSG_FAILURE;
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} finally {
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mHandler.sendMessage(msg);
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}
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}
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public boolean downloadFile(String downloadUrl, File saveFilePath) {
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int fileSize = -1;
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int downFileSize = 0;
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boolean result = false;
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int progress = 0;
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try {
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URL url = new URL(downloadUrl);
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HttpURLConnection conn = (HttpURLConnection) url.openConnection();
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if (null == conn) {
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return false;
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}
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// 读取超时时间 毫秒级
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conn.setReadTimeout(10000);
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conn.setRequestMethod("GET");
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conn.setDoInput(true);
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conn.connect();
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if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
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fileSize = conn.getContentLength();
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InputStream is = conn.getInputStream();
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FileOutputStream fos = new FileOutputStream(saveFilePath);
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byte[] buffer = new byte;
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int i = 0;
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int tempProgress = -1;
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while ((i = is.read(buffer)) != -1) {
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downFileSize = downFileSize + i;
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// 下载进度
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progress = (int) (downFileSize * 100.0 / fileSize);
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fos.write(buffer, 0, i);
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synchronized (this) {
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if (downFileSize == fileSize) {
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// 下载完成
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mNotifManager.cancel(R.id.downLoadIcon);
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} else if (tempProgress != progress) {
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// 下载进度发生改变，则发送Message
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mContentView.setTextViewText(R.id.progressPercent,
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progress + "%");
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mContentView.setProgressBar(R.id.downLoadProgress,
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100, progress, false);
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mDownNotification.contentView = mContentView;
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mDownNotification.contentIntent = mDownPendingIntent;
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mNotifManager.notify(R.id.downLoadIcon,
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mDownNotification);
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tempProgress = progress;
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}
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}
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}
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fos.flush();
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fos.close();
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is.close();
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result = true;
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} else {
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result = false;
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}
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} catch (Exception e) {
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result = false;
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Log.e(AhzyFisActivity.TAG, "downloadFile catch Exception:", e);
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}
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return result;
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}
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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?
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android:id="@+id/custom_notification"
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xmlns:android="http://schemas.android.com/apk/res/android"
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android:orientation="horizontal"
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android:layout_width="fill_parent"
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android:layout_height="fill_parent">
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android:id="@+id/downLoadIcon"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_marginLeft="5dip"
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android:layout_gravity="center_vertical"
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/>
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android:layout_height="fill_parent"
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android:layout_width="wrap_content"
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android:layout_marginLeft="5dip"
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android:text="@string/downloadProgress"
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android:gravity="center_vertical"
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/>
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android:id="@+id/downLoadProgress"
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style="?android:attr/progressBarStyleHorizontal"
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mce_style="?android:attr/progressBarStyleHorizontal"
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android:layout_marginLeft="10dip"
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android:layout_width="150dip"
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android:layout_height="wrap_content"
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android:layout_gravity="center_vertical"
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/>
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android:id="@+id/progressPercent"
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android:layout_height="fill_parent"
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android:layout_width="wrap_content"
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android:layout_marginLeft="5dip"
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android:gravity="center_vertical"
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/>
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