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現在、オンライン XML ファイルを解析し、AsyncTask を使用してデータをデータベースに挿入しようとしています。

AsyncTask が実行されると、ProgressDialog と通知バーを介して完了率をユーザーに通知します。

ユーザーは更新プロセス中にホームボタンを押して他のアプリにアクセスする可能性があるため、次のようなショートカットを開発したいと思います: ユーザーが通知バーに表示されたステータスをクリックすると、DataBaseUpdateService に直接戻ることができます。

以下は私が実装しようとして失敗したコードです。修正方法についてアドバイスをいただけますか?

データベース更新サービス

    public class DataBaseUpdateService extends Activity {

    Updatetask Task; 

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState); 
        Task = new Updatetask(this.getApplicationContext());
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
      super.onConfigurationChanged(newConfig);
    }

    @Override
    public void  onPause()
    {super.onPause();}

    @Override
    public void onResume()
    {super.onResume();
    if(Task.getStatus() == AsyncTask.Status.PENDING){Task.execute();}

    }

    public class Updatetask extends AsyncTask<Void, Integer, Void> 
    {ProgressDialog dialog;  

    private NotificationHelper mNotificationHelper;
    private Context context;


        public Updatetask_hymns(Context context){
            this.context = context;
            mNotificationHelper = new NotificationHelper(context);
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();

            mNotificationHelper.createNotification();
            dialog =new ProgressDialog(DataBaseUpdateService.this);
            dialog.setTitle("Updating DB...");
            dialog.setMax(100); 
            dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
            dialog.setIndeterminate(false);
            dialog.setCancelable(false);
            dialog.show();
        }

        @Override
        protected Void doInBackground(Void...unsed) {

***Code to parse xml and put in arraylist***

for(itemInsert=0;itemInsert<itemCount;itemInsert++)
{ ***insert data to database***
    if(itemCount > 0) { publishProgress((int) ((itemInsert / (float) itemCount) * 100));}
    }

            return null;}

        @Override
        protected void onPostExecute(Void unused) {
            mNotificationHelper.completed();            
            dialog.dismiss();
        }



        protected void onProgressUpdate(Integer... values) {
            mNotificationHelper.progressUpdate(values[0]);
            dialog.setProgress(values[0]);           
        }
    }

}

通知ヘルパー

public class NotificationHelper {
    private Context mContext;  
    private Notification mNotification;
    private NotificationManager mNotificationManager;
    private PendingIntent mContentIntent;


    private CharSequence mContentTitle;



    private int NOTIFICATION_ID = 1;

    public NotificationHelper(Context context)
    {
        mContext = context;
    }

    /**
     * Put the notification into the status bar
     */
    public void createNotification() {
        //get the notification manager
        if(mNotificationManager==null){
        mNotificationManager = (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE);}

        //create the notification
        int icon = android.R.drawable.stat_sys_download;
        CharSequence tickerText = mContext.getString(R.string.database_update_main_action); //Initial text that appears in the status bar
        long when = System.currentTimeMillis();

        mNotification = new Notification(icon, tickerText, when);

        //create the content which is shown in the notification pulldown
        mContentTitle = mContext.getString(R.string.database_update_title); //Full title of the notification in the pull down
        CharSequence contentTitle = "My notification";      
        CharSequence contentText = "0% complete"; //Text of the notification in the pull down

        Intent notificationIntent = new Intent(mContext,DataBaseUpdateService.class);
        notificationIntent.addFlags(Notification.FLAG_ONGOING_EVENT);
        mContentIntent = PendingIntent.getActivity(mContext, 0, notificationIntent, 0);

        //add the additional content and intent to the notification
        mNotification.setLatestEventInfo(mContext, contentTitle, contentText, mContentIntent);

        //make this notification appear in the 'Ongoing events' section
        mNotification.flags = Notification.FLAG_ONGOING_EVENT;

        //show the notification
        mNotificationManager.notify(NOTIFICATION_ID, mNotification);
    }

    /**
     * Receives progress updates from the background task and updates the status bar notification appropriately
     * @param percentageComplete
     */
    public void progressUpdate(int percentageComplete) {
        //build up the new status message
        CharSequence contentText = percentageComplete + "% complete";
        //publish it to the status bar
        mNotification.setLatestEventInfo(mContext, mContentTitle, contentText, mContentIntent);
        mNotificationManager.notify(NOTIFICATION_ID, mNotification);
    }

    /**
     * called when the background task is complete, this removes the notification from the status bar.
     * We could also use this to add a new ‘task complete’ notification
     */
    public void completed()    {
        //remove the notification from the status bar
        mNotificationManager.cancel(NOTIFICATION_ID);
    }
}
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1 に答える 1

0

フラグを維持して、アクティビティがバックグラウンドまたはフォアグラウンドにあることを確認します。フラグがバックグラウンドにある場合は、通知を表示し、クリックするだけでアクティビティの保留を開始します。

if(inBackGround){
    Intent contentIntent = new Intent(this,DataBaseUpdateService.class);
    PendingIntent contentPendingIntent = PendingIntent.getActivity(
                    this, 0, contentIntent,
                    PendingIntent.FLAG_UPDATE_CURRENT);

    PendingIntent.getBroadcast(this, 0, contentIntent , PendingIntent.FLAG_UPDATE_CURRENT);
    String notificationTitle ="sfdf";
    String notificationText = "dsf";
    Notification notification = new Notification(
            notificationIcon, notificationTitle, System.currentTimeMillis());
    notification.setLatestEventInfo(this, notificationTitle, notificationText, contentIntent);
    notification.flags |= Notification.FLAG_AUTO_CANCEL;

    // Trigger the notification.
    mNotificationManager.notify(0, notification);
}
于 2012-06-10T10:47:38.063 に答える