对话框不起作用-Android

Question

I made a refresh item in action bar. When u click it a dialog box will show asking to check the internet connection. The problem is there's no dialog box showing up at all. I wanna know if there's something wrong with my code.

private void Refresh() {

    if(IsparkLib.isInternetConnected(InquiryMainActivity.this)){
        nameOfMethod();

        AlertDialog.Builder dialog = new AlertDialog.Builder(InquiryMainActivity.this);
        dialog.setTitle("Are you sure you want to update?");
        dialog.setCancelable(true);
        dialog.setPositiveButton("Ok", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int arg1) {
                // TODO Auto-generated method stub
                Intent intent = new Intent(InquiryMainActivity.this,InquiryMainActivity.class);
                intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY | Intent.FLAG_ACTIVITY_CLEAR_TASK);
                startActivity(intent);
            }
        });
    }
    else{
        AlertDialog.Builder dialog = new AlertDialog.Builder(InquiryMainActivity.this);
        dialog.setTitle("Warning");
        dialog.setPositiveButton("OK",null);

        final TextView mes = new TextView(InquiryMainActivity.this);
        mes.setTextColor(Color.BLACK);
        mes.setText("Please check your internet connection");
        mes.setTextSize(20);


    }

Answer 1

You will need to call AlertDialog.show() to show alert on screen do it as:

AlertDialog alertDialog = dialog.create();
 // show it
alertDialog.show();

Answer 2

I think you are not calling dialog.show(); . Check once.

In else block try like this...

else{
    AlertDialog.Builder dialog = new AlertDialog.Builder(InquiryMainActivity.this);
    dialog.setTitle("Warning");
    dialog.setPositiveButton("OK",null);

    final TextView mes = new TextView(InquiryMainActivity.this);
    mes.setTextColor(Color.BLACK);
    mes.setText("Please check your internet connection");
    mes.setTextSize(20);

    dialog.show();//=> here is the change
}

Answer 3

You forgot to create the AlertDialog instance from AlertDialog.Builder object and to show that dialog.

Another thing , you have tried to create the AlertDialog.Builder object in both if-else condition in Refresh() method but you should create outside the if-else condition as below...

private void Refresh() {

    AlertDialog.Builder dialog = new AlertDialog.Builder(InquiryMainActivity.this);

    if(IsparkLib.isInternetConnected(InquiryMainActivity.this)){
        nameOfMethod();

        dialog.setTitle("Are you sure you want to update?");
        dialog.setCancelable(true);
        dialog.setPositiveButton("Ok", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int arg1) {
                // TODO Auto-generated method stub
                Intent intent = new Intent(InquiryMainActivity.this,InquiryMainActivity.class);
                intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY | Intent.FLAG_ACTIVITY_CLEAR_TASK);
                startActivity(intent);
            }
        });

    } else {

        dialog.setTitle("Warning");
        dialog.setPositiveButton("OK",null);

        final TextView mes = new TextView(InquiryMainActivity.this);
        mes.setTextColor(Color.BLACK);
        mes.setText("Please check your internet connection");
        mes.setTextSize(20);

    }

    AlertDialog alertDialog = dialog.createDialog();
    alertDialog.show();

}

Update:

For Cancel option, you have to add another button to the dialog as below...

dialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int id) {

        //add your code
        dialog.dismiss();

    }
});

Answer 4

Add this below two line after ifelse condition..

AlertDialog alertDialog = dialog.createDialog();
    alertDialog.show();

And you complete with your code....

Answer 5

edit your code as

private void Refresh() {

    if(IsparkLib.isInternetConnected(InquiryMainActivity.this)){
        nameOfMethod();

        AlertDialog.Builder dialog = new AlertDialog.Builder(InquiryMainActivity.this);
        dialog.setTitle("Are you sure you want to update?");
        dialog.setCancelable(true);
        dialog.setPositiveButton("Ok", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int arg1) {
                // TODO Auto-generated method stub
                Intent intent = new Intent(InquiryMainActivity.this,InquiryMainActivity.class);
                intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY | Intent.FLAG_ACTIVITY_CLEAR_TASK);
                startActivity(intent);
            }
        });

        dialog.show();
    }
    else{
        AlertDialog.Builder dialog = new AlertDialog.Builder(InquiryMainActivity.this);
        dialog.setTitle("Warning");
        dialog.setPositiveButton("OK",null);

        /*final TextView mes = new TextView(InquiryMainActivity.this);
        mes.setTextColor(Color.BLACK);
        mes.setText("Please check your internet connection");
        mes.setTextSize(20);*/  It's not necessary

        dialog.setMessage("Please check your internet connection");//

        dialog.show();
    }