Want to display AlertDialog in onCreate of Activity - android

问题

In my activity, I call a MyDialog (custom dialog) in onCreate() and handle its DismissListener in Activity to find if its cancelled or not. If its cancelled, I finish the activity, else load the activty. During this loading time, I want to show a Alert/Progress dialog to let the user know that its loading, please wait. But am not able to see the dialog. This is how I have coded :

  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ld = new AgreeDialog(this);
    ld.setOnDismissListener(new OnDismissListener() {
@Override
public void onDismiss(DialogInterface dialog) {
           if (ld.isCancelled)
    MyActivity.this.finish();
       else {
    //ProgressDialog pd = CreateLoadingDialog();
    //pd.show();
    //Log.i(TAG, "Before Load Is PD showing - " + pd.isShowing());  // Shows true
          /*
    AlertDialog.Builder adb = new AlertDialog.Builder(StartUltimate.this);
    adb.setTitle("Loading...");
    adb.setCancelable(false);
    AlertDialog ad = adb.create();
    ad.show();
    */  
    MyActivity.this.showDialog(0);
    LoadAfteAgree();  // This takes time sonetimes, so want a dialog while this is working 
    MyActivity.this.removeDialog(0);

    //ad.dismiss();
                // pd.dismiss();
    //Log.i(TAG, "After Load Is PD showing - " + ad.isShowing());    // Shows false
     }
}           
    });

@Override
protected Dialog onCreateDialog(int id) {
    switch(id) {
    case 0:
        loadingDlg = new ProgressDialog(this);
        loadingDlg.setMessage("Loading...");
        loadingDlg.setCancelable(false);
        loadingDlg.setIcon(R.drawable.icon);
        return loadingDlg;
    }
    return null;
}

Why am I not able to see any dialog in any way ? I tried calling them in LoadAfterAgree() also, but there also no success, same results.

Any help is highly appreciated.

Thanks

回答1:

you're performing your long operations in UI thread. Move them to the AsyncTask's doInBackground method. See the example here.

回答2:

To stop your dialog causing any memory leaks, ensure the following is included in your activity;

AlertDialog _alert;

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

      if(_alert != null)
          _alert.dismiss();
  }

来源：https://stackoverflow.com/questions/5755980/want-to-display-alertdialog-in-oncreate-of-activity-android