Android showing a dialog in activity

Question

I created a new class that extends the DialogFragment class:

public class SaveDataDialog extends DialogFragment {
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        // Get the layout inflater
        LayoutInflater inflater = getActivity().getLayoutInflater();

        // Inflate and set the layout for the dialog
        // Pass null as the parent view because its going in the dialog layout
        builder.setView(inflater.inflate(R.layout.save_data_dialog, null))
        // Add action buttons
                .setPositiveButton(R.string.save_data, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int id) {
                        Toast.makeText(getActivity(), "Testing positive button", Toast.LENGTH_LONG).show();
                    }
                }).setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        SaveDataDialog.this.getDialog().cancel();
                    }
                });
        return builder.create();
    }

}

And somewhere in my main activity (inside of a button onClick), I want to show this dialog. So I tried:

SaveDataDialog sdd = new SaveDataDialog();
sdd.getDialog().show();

Second line gives a null pointer exception.

How do I show the dialog? That's all I want to do.

Answer 1

try

sdd.show();

instead of

sdd.getDialog().show();

since your dialog extends DialogFragment, you don't have to call .getDialog()

More details: http://android-developers.blogspot.com/2012/05/using-dialogfragments.html

Answer 2

您的SaveDataDialog扩展了DialogFragment ，您可以调用sdd.show()来显示DialogFragment 。

Answer 3

Inside your activity use the following code to show your dialog fragment.

SaveDataDialog saveDataDialog = new SaveDataDialog();
saveDataDialog.show(getFragmentManager(), SaveDataDialog.class.getName());

http://developer.android.com/reference/android/app/DialogFragment.html#show(android.app.FragmentTransaction , java.lang.String)

If your application supports Android versions before 3.0.x. You will need to use the support library and import android.app.v4.DialogFragment.

http://developer.android.com/tools/support-library/index.html

Answer 4

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