如何解决为什么ListView在“片段”对话框中始终为空
对话框正确显示，但列表视图始终为空。 这是我启动活动时得到的 enter image description here
public class MainFragment extends Fragment {
String[] cities = {"Tanger","Meknes","Casablanca","Fes","Tetouan","Taza","Rabat"};
Dialog dialog;
@Override
public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
// Inflate the layout for this fragment
TextView currentCity = view.findViewById(R.id.city);
currentCity.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog = new Dialog(getContext());
dialog.setContentView(R.layout.dialog_searchable_spinner);
dialog.getWindow().setLayout(800,1000);
View spinnerView = getLayoutInflater().inflate(R.layout.dialog_searchable_spinner,container,false);
dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
dialog.show();
EditText searchTextView = spinnerView.findViewById(R.id.editText);
ListView citiesListView = spinnerView.findViewById(R.id.citiesListView);
ArrayAdapter<String> adapter = new ArrayAdapter<>(getActivity(),android.R.layout.simple_list_item_1,cities);
citiesListView.setAdapter(adapter);
}
解决方法
DialogLayout：
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/alert_dialog"
android:padding="16dp"
android:orientation="vertical"
android:gravity="center">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="البحث عن المدينة"
android:textSize="25sp"
android:textColor="@color/primaryColor"
android:fontFamily="@font/alhurra"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="@+id/editText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:background="@android:drawable/editbox_background"
android:hint="إسم المدينة..."
android:fontFamily="@font/aj_bold"
android:textDirection="rtl"
android:layoutDirection="rtl"
android:padding="10dp"
android:singleLine="true"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView" />
<ListView
android:id="@+id/citiesListView"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginTop="5dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toBottomOf="@+id/editText"
tools:layout_editor_absoluteX="16dp" />
</androidx.constraintlayout.widget.ConstraintLayout>
FragmentLayout
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/activitybackground"
tools:context=".MainFragment">
<TextView
android:id="@+id/city"
android:layout_width="120dp"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:layout_weight="1"
android:fontFamily="@font/alhurra"
android:gravity="center"
android:text="مكنـاس"
android:textColor="@color/primaryColor"
android:textSize="20sp" />
</androidx.constraintlayout.widget.ConstraintLayout>
这是您的布局问题。 ConstraintLayout以某种方式隐藏了列表视图。您必须在布局文件中进行一些更改。例如，使用LinearLayout
Dialog dialog;
dialog = new Dialog(this);
dialog.setContentView(R.layout.dialog_searchable_spinner);
dialog.getWindow().setLayout(800,1000);
//View spinnerView = getLayoutInflater().inflate(R.layout.dialog_searchable_spinner,binding.getRoot());
//dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
ListView citiesListView = dialog.findViewById(R.id.citiesListView);
ArrayAdapter<String> adapter = new ArrayAdapter<>(getApplicationContext(),android.R.layout.simple_list_item_1,cities);
citiesListView.setAdapter(adapter);
dialog.show();
==
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="16dp"
android:orientation="vertical"
android:gravity="center">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="البحث عن المدينة"
android:textSize="25sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="@+id/editText"
android:layout_below="@id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:background="@android:drawable/editbox_background"
android:hint="إسم المدينة..."
android:textDirection="rtl"
android:layoutDirection="rtl"
android:padding="10dp"
android:singleLine="true"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView" />
<ListView
android:id="@+id/citiesListView"
android:layout_below="@id/editText"
android:layout_width="match_parent"
android:layout_height="400dp"
android:layout_marginTop="5dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toBottomOf="@+id/editText"
tools:layout_editor_absoluteX="16dp" />
</RelativeLayout>
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