Android使用DownloadManager实现版本更新

需要添加的权限

<uses-permission android:name="android.permission.INTERNET"/><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/><uses-permission android:name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION"/>

代码实现部分

获取服务端版本号与本地应用版本号比对的过程此处省略，下面是Activity中代码

//弹出版本更新提示框Dialog dialog = new AlertDialog.Builder(context).setIcon(R.drawable.ic_launcher).setTitle("更新提示").setMessage(updateMessage()).setPositiveButton("后台更新", new DialogInterface.OnClickListener() {    @Override    public void onClick(DialogInterface arg0, int arg1) {        // TODO Auto-generated method stub        Toast.makeText(context, "开始下载", 0).show();        //下载Apk文件        new ApkDownLoad(getApplicationContext(), APK_URL, "美丽说", "版本升级").execute();    }}).setNegativeButton("取消", new DialogInterface.OnClickListener() {    @Override    public void onClick(DialogInterface arg0, int arg1) {        // TODO Auto-generated method stub        arg0.cancel();    }}).create();dialog.show();

也可以将这段代码写在自定义Application类的OnCreate()方法中, 如果在Application中写入以上代码需要添加一个全局弹出Dialog的权限和属性。

//在dialog.show()之前添加dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);//系统权限<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

ApkDownLoad.java

public class ApkDownLoad {    public static final String DOWNLOAD_FOLDER_NAME = "Download"; //Sd卡根目录文件夹名称    public static final String DOWNLOAD_FILE_NAME   = "MeiLiShuo.apk"; //下载Apk名称    public static final String APK_DOWNLOAD_ID = "apkDownloadId";    private Context context;    private String url;    private String notificationTitle;    private String notificationDescription;    private DownloadManager downloadManager;    private CompleteReceiver completeReceiver;    /**     * @param context      * @param url 下载apk的url     * @param notificationTitle 通知栏标题     * @param notificationDescription 通知栏描述     */    public ApkDownLoad(Context context, String url, String notificationTitle,            String notificationDescription) {        super();        this.context = context;        this.url = url;        this.notificationTitle = notificationTitle;        this.notificationDescription = notificationDescription;        downloadManager = (DownloadManager)context.getSystemService(context.DOWNLOAD_SERVICE);        completeReceiver = new CompleteReceiver();        /** register download success broadcast **/        context.registerReceiver(completeReceiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));    }    public void execute() {        //清除已下载的内容重新下载        long downloadId = PreferencesUtils.getLong(context, APK_DOWNLOAD_ID);        if(downloadId != -1){            downloadManager.remove(downloadId);             PreferencesUtils.removeSharedPreferenceByKey(context, APK_DOWNLOAD_ID);        }        Request request = new Request(Uri.parse(url));        //设置Notification中显示的文字        request.setTitle(notificationTitle);        request.setDescription(notificationDescription);        //设置可用的网络类型        request.setAllowedNetworkTypes(Request.NETWORK_MOBILE  | Request.NETWORK_WIFI);         //设置状态栏中显示Notification        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);        //不显示下载界面          request.setVisibleInDownloadsUi(false);         //设置下载后文件存放的位置        File folder = Environment.getExternalStoragePublicDirectory(DOWNLOAD_FOLDER_NAME);        if (!folder.exists() || !folder.isDirectory()) {            folder.mkdirs();        }        request.setDestinationInExternalPublicDir(DOWNLOAD_FOLDER_NAME, DOWNLOAD_FILE_NAME);        //设置文件类型          MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();          String mimeString = mimeTypeMap.getMimeTypeFromExtension(MimeTypeMap.getFileExtensionFromUrl(url));          request.setMimeType(mimeString);         //保存返回唯一的downloadId        PreferencesUtils.putLong(context, APK_DOWNLOAD_ID, downloadManager.enqueue(request));    }    class CompleteReceiver extends BroadcastReceiver {        @Override        public void onReceive(Context context, Intent intent) {            /**             * get the id of download which have download success, if the id is my id and it's status is successful,             * then install it             **/            long completeDownloadId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, 0);            long downloadId = PreferencesUtils.getLong(context, APK_DOWNLOAD_ID);            if (completeDownloadId == downloadId) {                // if download successful                if (queryDownloadStatus(downloadManager, downloadId) == DownloadManager.STATUS_SUCCESSFUL) {                    //clear downloadId                    PreferencesUtils.removeSharedPreferenceByKey(context, APK_DOWNLOAD_ID);                    //unregisterReceiver                    context.unregisterReceiver(completeReceiver);                    //install apk                    String apkFilePath = new StringBuilder(Environment.getExternalStorageDirectory().getAbsolutePath())                            .append(File.separator).append(DOWNLOAD_FOLDER_NAME).append(File.separator)                            .append(DOWNLOAD_FILE_NAME).toString();                    install(context, apkFilePath);                }            }        }    };    /** 查询下载状态 */    public static int queryDownloadStatus(DownloadManager downloadManager, long downloadId){         int result = -1;         DownloadManager.Query query = new DownloadManager.Query().setFilterById(downloadId);         Cursor c = null;         try {             c = downloadManager.query(query);             if (c != null && c.moveToFirst()) {                 result = c.getInt(c.getColumnIndex(DownloadManager.COLUMN_STATUS));             }         } finally {             if (c != null) {                 c.close();             }         }         return result;    }    /**     * install app     *      * @param context     * @param filePath     * @return whether apk exist     */    public static boolean install(Context context, String filePath) {        Intent i = new Intent(Intent.ACTION_VIEW);        File file = new File(filePath);        if (file != null && file.length() > 0 && file.exists() && file.isFile()) {            i.setDataAndType(Uri.parse("file://" + filePath), "application/vnd.android.package-archive");            i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);            context.startActivity(i);            return true;        }        return false;    }    }

PreferencesUtils.java

public class PreferencesUtils {    public static String PREFERENCE_NAME = "VersionUpdate";    /**     * put long preferences     *      * @param context     * @param key The name of the preference to modify     * @param value The new value for the preference     * @return True if the new values were successfully written to persistent storage.     */    public static boolean putLong(Context context, String key, long value) {        SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);        SharedPreferences.Editor editor = settings.edit();        editor.putLong(key, value);        return editor.commit();    }    /**     * get long preferences     *      * @param context     * @param key The name of the preference to retrieve     * @return The preference value if it exists, or -1. Throws ClassCastException if there is a preference with this     *         name that is not a long     * @see #getLong(Context, String, long)     */    public static long getLong(Context context, String key) {        return getLong(context, key, -1);    }    /**     * get long preferences     *      * @param context     * @param key The name of the preference to retrieve     * @param defaultValue Value to return if this preference does not exist     * @return The preference value if it exists, or defValue. Throws ClassCastException if there is a preference with     *         this name that is not a long     */    public static long getLong(Context context, String key, long defaultValue) {        SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);        return settings.getLong(key, defaultValue);    }    /**     * remove obj in preferences      * @param context     * @param key     * @return     */    public static boolean removeSharedPreferenceByKey(Context context, String key){        SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);        SharedPreferences.Editor editor = settings.edit();        editor.remove(key);        return editor.commit();    }}