下面的代码不会更改所有ListView's行的文本，因为getChildCount()不会获取所有ListView's行，而只会更改可见的行。
for (int i = 0; i < listView.getChildCount(); i++)
{
View v = listView.getChildAt(i);
TextView tx = (TextView) v.findViewById(R.id.mytext);
tx.setTextSize(newTextSize);
}
所以我该怎么做？
ListView's当一行变得可见时，是否有用于获取通知的代码，所以我可以设置它的文本大小？
在 ListView 中，唯一的孩子是可见的。如果您想对“所有孩子”做某事，请在适配器中进行。那是最好的地方。
API Demos 中的List13使用 OnScrollStateChanged 做了类似的事情。不过，可能有更好的方法：
public void onScrollStateChanged(AbsListView view, int scrollState) {
switch (scrollState) {
case OnScrollListener.SCROLL_STATE_IDLE:
mBusy = false;
int first = view.getFirstVisiblePosition();
int count = view.getChildCount();
for (int i=0; i<count; i++) {
TextView t = (TextView)view.getChildAt(i);
if (t.getTag() != null) {
t.setText(mStrings[first + i]);
t.setTag(null);
}
}
mStatus.setText("Idle");
break;
. . .
由 Corey Trager 编辑：
上述内容无疑为我指明了正确的方向。我发现处理 OnScrollListener.onScroll 比 onScrollStateChanged 效果更好。即使我删除了 onScrollSgtaetChanged 中的 case 语句并处理了每个状态更改，某些文本也没有调整大小。但是使用 onScroll，一切似乎都奏效了。
因此，我看似有效的代码如下所示：
public void onScroll(AbsListView v, int firstVisibleItem, int visibleCount, int totalItemCount)
{
ListView lv = this.getListView();
int childCount = lv.getChildCount();
for (int i = 0; i < childCount; i++)
{
View v = lv.getChildAt(i);
TextView tx = (TextView) v.findViewById(R.id.mytext);
tx.setTextSize(textSize);
}
}
不太确定性能效果，但你可以试试这个。
//declare the list
ListView list = (ListView)findViewById(R.id.yourListID);
// in my case i have spinners and made a test just to know if this works
Spinner spnWhatever;
View view;
int i =0;
do{
view =list.getAdapter().getView(i,null,null);
//get the spinners from each row
spnWhatever =(Spinner)view.findViewById(R.id.spnTarifas);
i++;
}while(list.getAdapter().getCount() !=i);
//Create layout file containing views you want to read input from
//layout/gen_edt_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/parLay"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.google.android.material.textfield.TextInputEditText
android:id="@+id/edtGName"
android:layout_width = "match_parent"
android:layout_height ="wrap_content"
android:hint="Name"
android:inputType="text" />
<com.google.android.material.textfield.TextInputEditText
android:id="@+id/edtGIdPass"
style="@style/edt"
android:hint="Id number"
android:inputType="number" />
</LinearLayout>
//Create Empty Activity -> MultipleInput
//layout/activity_multiple_input.xml
<?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"
tools:context=".OpenAccount">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent">
<ListView
android:id="@+id/inputLView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="60dp" />
</LinearLayout>
<Button
android:layout_width="wrap_content
android:layout_height="wrap_content"
android:text="Read"
android:onClick="readInput"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent>
</androidx.constraintlayout.widget.ConstraintLayout>
public class MultipleInput extends AppCompatActivity {
//Declare and intialize arrays to store input fields as public modifiers
ArrayList<TextInputEditText> edtNameArr = new ArrayList<>();
ArrayList<TextInputEditText> edtIdsArr = new ArrayList<>();
//Intialize arrays to store input values as public modifiers
ArrayList<String> arr0 = new ArrayList<>();
ArrayList<String> arr1 = new ArrayList<>();
ListView listView;
@Override
protected void onCreate(Bundle savedInstanceState) {
listView = findViewById(R.id.listView);
edtNameArr.clear();
edtIdsArr.clear();
arr0.clear();
arr1.clear();
//set number of group fields to be generated
int members = 4;
//initialize class passing fields number and context
edtAdapter = new EdtAdapter(members, getApplicationContext());
//Set retured fields in listView
listView.setAdapter(edtAdapter);
}
public class EdtAdapter extends BaseAdapter {
class ViewHolder {
TextInputEditText edtGName, edtGIdPass;
}
public Context context;
ArrayList<EdtClass> edtArrayList;
int members;
EdtAdapter(int members, Context context) {
this.members = members;
this.context = context;
}
@Override
public int getCount() {
return members;
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View contentView, ViewGroup parent) {
View rowView = contentView;
if (rowView == null) {
viewHolder = new ViewHolder();
LayoutInflater inflater = getLayoutInflater();
rowView = inflater.inflate(R.layout.gen_edt_layout, parent, false);
viewHolder.edtGName = rowView.findViewById(R.id.edtGName);
viewHolder.edtGIdPass = rowView.findViewById(R.id.edtGIdPass);
viewPosition = position;
//loop adding input fields in arrays
for (int i = 0; i < members; i++) {
edtNameArr.add(viewHolder.edtGName);
edtIdsArr.add(viewHolder.edtGIdPass);
}
} else {
viewHolder = (ViewHolder) contentView.getTag();
}
return rowView;
}
}
//Read input when button clicked
public void readInput(View view){
for(int edt = 0; edt<edtNameArr.size(); edt++){
String name = Objects.requireNonNull(edtNameArr.get(edt).getText()).toString();
if(!arr0.contains(name)) {
arr0.add(name);
}
String ids = Objects.requireNonNull(edtIdsArr.get(edt).getText()).toString();
if(!arr1.contains(ids)) {
arr1.add(ids);
}
}
StringBuilder name = new StringBuilder();
StringBuilder idno = new StringBuilder();
//loop through arrays with input, reading and appending values in StringBuilder
for (int m = 0; m < arr0.size(); m++) {
name.append(arr0.get(m)).append(",");
idno.append(arr1.get(m)).append(",");
}
//Show input values in logcat/Toast
Log.e("Names ", name.toString());
Log.e("Ids ", idno.toString());
Toast.makeText(MultipleInput.this, "Names "+ name.toString(), Toast.LENGTH_LONG).show();
}