Wsrtjtyk

I`m trying to set title text size for DialogFragment

I coded for my old test device (Android 5.0 API 21) and all was ok

But app falls after I began to use new test device (Android 8.1 API 27)

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

                         Bundle savedInstanceState) {

    View rootView = inflater.inflate(R.layout.fragment_multiple_info_dialog, null, false);

    getDialog().setTitle(R.string.dialog_fragment_BAC_info_title);

    TextView title = getDialog().findViewById(android.R.id.title);

    title.setTextSize(30);

    title.setTextColor(getResources().getColor(R.color.white));

it falls at the line setTextSize(30) with error

java.lang.NullPointerException: Attempt to invoke virtual method 'void
android.widget.TextView.setTextSize(float)' on a null object reference

Yes, log say me that title == null

I tried to replace part of code to onDialogCreate(Bundle savedInstanceState)...

But same thing - now app falls on same line inside onDialogCreate...

Any ideas how to fix it?

from Gradle

    compileSdkVersion 27

    minSdkVersion 21

    targetSdkVersion 27

this may help, pass the textsize as well as the unit.

* @param unit The desired dimension unit.

 * @param size The desired size in the given units.

 *

 * @attr ref android.R.styleable#TextView_textSize

 */

public void setTextSize(int unit, float size)

thanx to Mike M.

correct solution is

to define style for dialog fragment inside onCreate() and set title params inside onCreateDialog() methods of DialogFragment class

@Override

public void onCreate(@Nullable Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setStyle(DialogFragment.STYLE_NORMAL, R.style.DialogFragmentStyle);

}

need to add style in styles.xml

<style name="DialogFragmentStyle" parent="Theme.AppCompat.Light.Dialog">

    <item name="windowActionBar">false</item>

    <item name="windowNoTitle">false</item>

    <item name="android:windowActionBar">false</item>

    <item name="android:windowNoTitle">false</item>

</style>

and after need to design dialog

@NonNull

@Override

public Dialog onCreateDialog(Bundle savedInstanceState) {

    Dialog dialog = super.onCreateDialog(savedInstanceState);

    TextView title = dialog.findViewById(android.R.id.title);  //here it works!

    title.setTextSize(30);

    title.setText(R.string.dialog_fragment_title);

    title.setTextAlignment(View.TEXT_ALIGNMENT_CENTER);

    title.setTextColor(getResources().getColor(R.color.orange));

    dialog.getWindow().setLayout(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);

    return dialog;

}