Android 開發之文件下載，狀態時顯示下載進度，點擊自動安裝

發布時間：2013-9-4 15:51 發布者：reggae

關鍵詞： android

在進行軟件升級時，需要進行文件下載，在這里實現自定義的文件下載，并在狀態欄顯示下載進度，下載完成后，點擊觸發安裝。
效果如圖：

用于下載文件和顯示現在進度的線程類如下：

001
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; // 文件下載url，已做非空檢查
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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卡應用目錄
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private final String APK_FOLDER = "apkFile"; // 下載apk文件目錄
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public static final int MSG_UNDOWN = 0; //未開始下載
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public static final int MSG_DOWNING = 1; // 下載中
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public static final int MSG_FINISH = 1; // 下載完成
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public static final int MSG_FAILURE = 2;// 下載失敗
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private NotificationManager mNotifManager;
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private Notification mDownNotification;
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private RemoteViews mContentView; // 下載進度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卡準備好
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File sdcardDir = Environment.getExternalStorageDirectory();
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// 文件存放路徑： 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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//創建存放目錄
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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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// 讀取超時時間毫秒級
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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[1024];
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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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// 下載進度
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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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// 下載完成
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mNotifManager.cancel(R.id.downLoadIcon);
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} else if (tempProgress != progress) {
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// 下載進度發生改變，則發送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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}

復制代碼

在下載過程中，如果需要和主線程（UI Main Thread）通信，及時讓主線程了解下載進度和狀態，可用通過Handle向主線程發送Message
進度條顯示的布局文件如下：
查看源碼打印?

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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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復制代碼

希望本文對廣大安卓開發者有所幫助，感謝閱讀本文。更多安卓技術問題歡迎加群探討：278744577，驗證碼:eec,不寫驗證不予通過喲~

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Android 開發之文件下載，狀態時顯示下載進度，點擊自動安裝

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