Android警报对话框未显示

Question

I create and show an alert dialog from onPostResume method of the Activity. The dialog is not shown but i cannot understand why.

My code for showing the dialog:

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("message");
builder.setPositiveButton("a", aListener);
builder.setPositiveButton("b", bListener);
builder.setCancelable(false);

AlertDialog dlg = builder.create();
dlg.show();

Answer 1

Try to use:

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("message");
builder.setPositiveButton("a", aListener);
builder.setPositiveButton("b", bListener);
builder.setCancelable(false);
builder.show();

Note: There is no reason to create another AlertDialog instance.

---

Or another correct approach you can create method that returns new AlertDialog :

protected static final int CREATE_INFORMATION_DIALOG = 1320;

private Dialog createDialog(int type) {
        AlertDialog dialog = null;
        switch (type) {
            case CREATE_INFORMATION_DIALOG:
                dialog = new AlertDialog.Builder(this)
                    .setTitle("Information")
                    .setMessage("Download was finished successfully.")
                    .setPositiveButton("Close", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dlg, int whichButton) {

                        }
                    })
                    .create();
                break;
        }
        return dialog;
    }

And then just call it like

createDialog(CREATE_INFORMATION_DIALOG).show();