<provider  android:authorities="包名.fileprovider"  android:name="android.support.v4.content.FileProvider"  android:grantUriPermissions="true"//這是設置uri的權限  android:exported="false">  <meta-data    android:name="android.support.FILE_PROVIDER_PATHS"    android:resource="@xml/file_paths"/>//在第二步的時候會有介紹</provider>

<?xml version="1.0" encoding="utf-8"?><resources>  <paths>    <external-path path="" name="download" />  </paths></resources>

public class UpdateManager {  private Context mContext;  private static String savePath ;  private String saveFileName ;  private ProgressBar mProgress; //下載進度條控件  private static final int DOWNLOADING = 1; //表示正在下載  private static final int DOWNLOADED = 2; //下載完畢  private static final int DOWNLOAD_FAILED = 3; //下載失敗  private int progress; //下載進度  private boolean cancelFlag = false; //取消下載標志位  private String serverVersion; //從服務器獲取的版本號  private String apkUrl;//  private String apkUrl = "http://liuliu.lejuhuyu.com/AndroidApk/liuliu-dashou-app-1.0.2.apk";  private String clientVersion; //客戶端當前的版本號  private String updateDescription = "請更新當前最新版本"; //更新內容描述信息  private String forceUpdate; //是否強制更新  private String update;  private VersionBean mVersionBean;  private AlertDialog alertDialog1, alertDialog2; //表示提示對話框、進度條對話框  public UpdateManager(Context context,VersionBean versionBean) {    this.mContext = context;    this.mVersionBean = versionBean;    apkUrl = "http://liuliu.lejuhuyu.com/AndroidApk/liuliu-dashou-app-"+versionBean.getLastVersion()+".apk";    savePath = Environment.DIRECTORY_DOWNLOADS;    saveFileName = savePath + "/liuliu-dashou-app-"+versionBean.getLastVersion()+".apk";  }  /** 顯示更新對話框 */  public void showNoticeDialog() {    serverVersion = mVersionBean.getLastVersion();    clientVersion = mVersionBean.getVersion();    L.e("apkUrl="+apkUrl);    L.e("savePath="+savePath);    L.e("saveFileName="+saveFileName);//    forceUpdate = StringUtils.getVersion();//    forceUpdate = "1";    forceUpdate = mVersionBean.getImportant();    update = mVersionBean.getUpdate();    //如果版本最新，則不需要更新    if (serverVersion.equals(clientVersion))      return;    if (update.equals("2"))      return;    AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);    dialog.setTitle("發現新版本 ：" + serverVersion);    dialog.setMessage(updateDescription);    dialog.setPositiveButton("現在更新", new DialogInterface.OnClickListener() {      @Override      public void onClick(DialogInterface arg0, int arg1) {        // TODO Auto-generated method stub        arg0.dismiss();        showDownloadDialog();      }    });    //是否強制更新    if (forceUpdate.equals("2")) {      dialog.setNegativeButton("待會更新", new DialogInterface.OnClickListener() {        @Override        public void onClick(DialogInterface arg0, int arg1) {          // TODO Auto-generated method stub          arg0.dismiss();        }      });    }    alertDialog1 = dialog.create();    alertDialog1.setCancelable(false);    alertDialog1.show();  }  /** 顯示進度條對話框 */  public void showDownloadDialog() {    AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);    dialog.setTitle("正在更新");    final LayoutInflater inflater = LayoutInflater.from(mContext);    View v = inflater.inflate(R.layout.softupdate_progress, null);    mProgress = (ProgressBar) v.findViewById(R.id.update_progress);    dialog.setView(v);    //如果是強制更新，則不顯示取消按鈕//    if (forceUpdate.equals("1")) {//      dialog.setNegativeButton("取消", new DialogInterface.OnClickListener() {//        @Override//        public void onClick(DialogInterface arg0, int arg1) {//          // TODO Auto-generated method stub//          arg0.dismiss();//          cancelFlag = false;//        }//      });//    }    alertDialog2 = dialog.create();    alertDialog2.setCancelable(false);    alertDialog2.show();    //下載apk    downloadAPK();  }  DownloadManager manager;  Cursor cursor;  DownloadManager.Request down;  DownloadManager.Query query;  ContentObserver contentObserver;  /** 下載apk的線程 */  public void downloadAPK() {    manager = (DownloadManager) LiuLiuApplication.getContext().getSystemService(Context.DOWNLOAD_SERVICE);    down = new DownloadManager.Request(Uri.parse(apkUrl));    // 設置允許使用的網絡類型，這里是移動網絡和wifi都可以    down.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE        | DownloadManager.Request.NETWORK_WIFI);    // 顯示下載界面    down.setVisibleInDownloadsUi(true);    // 設置下載路徑和文件名    down.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "liuliu-dashou-app-"+mVersionBean.getLastVersion() + ".apk");    down.setMimeType("application/vnd.android.package-archive");    // 設置為可被媒體掃描器找到    down.allowScanningByMediaScanner();    down.setAllowedOverRoaming(false);//    down.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);    long id = manager.enqueue(down);    query = new DownloadManager.Query().setFilterById(id);    contentObserver = new ContentObserver(mHandler) {      @Override      public void onChange(boolean selfChange) {//        super.onChange(selfChange);        boolean downloading = true;        while(downloading){          cursor = manager.query(query);          try {            if (cursor != null && cursor.moveToFirst()) {              int bytes_downloaded = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR));              int bytes_total = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_TOTAL_SIZE_BYTES));              progress = (int) ((bytes_downloaded * 100) / bytes_total);              mHandler.sendEmptyMessage(DOWNLOADING);              if (cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS))==DownloadManager.STATUS_SUCCESSFUL) {                mHandler.sendEmptyMessage(DOWNLOADED);              }else if (cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS))==DownloadManager.STATUS_FAILED){                mHandler.sendEmptyMessage(DOWNLOAD_FAILED);              }            }          }catch (Exception e){            e.printStackTrace();            mHandler.sendEmptyMessage(DOWNLOAD_FAILED);          }finally {            if (cursor != null){              downloading = false;              cursor.close();            }          }        }      }    };    mContext.getContentResolver().registerContentObserver(Uri.parse("content://downloads/"),true,contentObserver);  }  /** 更新UI的handler */  private Handler mHandler = new Handler() {    @Override    public void handleMessage(Message msg) {      // TODO Auto-generated method stub      switch (msg.what) {        case DOWNLOADING:          mProgress.setProgress(progress);          break;        case DOWNLOADED:          if (alertDialog2 != null)            alertDialog2.dismiss();          installAPK();          break;        case DOWNLOAD_FAILED:          ToastUtil.getInstance(mContext,"網絡斷開，請稍候再試",false).show();          break;        default:          break;      }    }  };  /** 下載完成后自動安裝apk */  public void installAPK() {    File apkFile = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS),"liuliu-dashou-app-"+mVersionBean.getLastVersion() + ".apk");    if (!apkFile.exists()) {      return;    }    if (Build.VERSION.SDK_INT>=24){           Uri apkUri = FileProvider.getUriForFile(mContext, LiuLiuApplication.getContext().getPackageName()+".fileprovider", apkFile);      Intent install = new Intent(Intent.ACTION_VIEW);      install.addCategory(Intent.CATEGORY_DEFAULT);      install.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);      install.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);      install.setDataAndType(apkUri, "application/vnd.android.package-archive");      mContext.startActivity(install);    } else {      Intent intent = new Intent();      intent.setAction(Intent.ACTION_VIEW);      intent.addCategory(Intent.CATEGORY_DEFAULT);      intent.setType("application/vnd.android.package-archive");      intent.setData(Uri.fromFile(apkFile));      intent.setDataAndType(Uri.fromFile(apkFile), "application/vnd.android.package-archive");      intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);      mContext.startActivity(intent);    }  }}