Question

I am using ProgressDialog in my app but on running the app errors occurred.

Here is the code

   public class MainActivity extends Activity{


    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);

        ProgressDialog mDialog = new ProgressDialog(getApplicationContext());
        mDialog.setMessage("Loading...");
        mDialog.setCancelable(false);
        mDialog.show();

    }
}

Updated Code:

public class MainActivity extends Activity{

public static ProgressDialog dialog;


public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);



}


 private static abstract class DictionaryOpenHelper extends SQLiteOpenHelper {



     public DictionaryOpenHelper() {
        super(null, null, null, 0);
        // TODO Auto-generated constructor stub
    }



    public void onCreate() {
        // TODO Auto-generated method stub

        ProgressDialog dialog = ProgressDialog.show(DictionaryOpenHelper.this, "", 
                "Loading. Please wait...", true);  

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub

    }


 }

}

and give error on ProgressDialog dialog = ProgressDialog.show(DictionaryOpenHelper.this, “”,
“Loading. Please wait…”, true); :

The method show(Context, CharSequence, CharSequence, boolean) in the type ProgressDialog is not applicable for the arguments (MainActivity.DictionaryOpenHelper, String, String, boolean)

Answer 1

    Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
01-18 06:26:07.273: E/AndroidRuntime(3853):     at android.view.ViewRootImpl.setView(ViewRootImpl.java:524)

Load and Unload Progress Dialog Can be Attempt with the Following Snippet
make it a part of UIThread
///load

  private ProgressDialog pDialogTh = null;
      private void showLoading() {
        runOnUiThread(new Runnable() {
            public void run() {
                // if(pDialog==null)
                pDialogTh = ProgressDialog.show(YourActivity.this, "", "Loading...",
                        true, true);
                pDialogTh.setCancelable(false);
                if (!pDialogTh.isShowing()) {
                    pDialogTh.show();
                }
            }
        });
    }

///////Unload

private void hideLoading() {
    runOnUiThread(new Runnable() {
        public void run() {
            if (pDialogTh.isShowing()) {
                pDialogTh.cancel();
            }
        }
    });
}