我在自定义视图中做错了什么导致它无法在我的可扩展列表视图中呈现（其他视图呈现正常）- Android
What did I do wrong in my custom view to cause it to not be rendered in my expandable list view (other views render fine) - Android
我正在尝试在 Android 中创建一个可扩展列表视图，它使用自定义 UI 组件作为子视图，但我在实际渲染时遇到了问题。使用调试器跟踪我的应用程序时，我看到我的自定义 UI 对象已实例化并设置了数据，但它似乎没有添加到视图中，即使我在 [=18] 结束时返回视图=].
我的最终目标是制作一个自定义 UI 元素 ServiceSelectionCheckbox，我可以直接从布局面板拖放它。
我尝试直接为该组件膨胀 XML 以查看是否是我的 XML 出现了导致静默故障的问题，但它似乎膨胀得很好。我还尝试创建一个辅助的更简单的 UI 组件，它具有坚实的背景，看看我是否可以正确添加它，它做得很好。这让我认为我的问题出在我的自定义 UI 组件 ServiceSelectionCheckbox.java 上，但我似乎无法弄清楚那个问题是什么。我的 linter 没有抛出任何错误，我的 apk 编译正常。
如能为我指明正确的方向，我们将不胜感激。
MainActivity.java
public class MainActivity extends AppCompatActivity {
public HashMap<String, ArrayList<Pair<String, String>>> hashMapOfServices = new HashMap<>();
public ArrayList<Pair<String, String>> aList;
public ExpandableListView list;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
aList = new ArrayList<Pair<String, String>>();
aList.add(new Pair<>("Men's Haircut", "50.00"));
hashMapOfServices.put("Haircut", aList);
list = (ExpandableListView) this.findViewById(R.id.list);
list.setAdapter((ExpandableListAdapter) new ServiceExpandableListAdapter(this, this.hashMapOfServices));
}
}
这是我的自定义适配器
ServiceExpandableListAdapter.java
public class ServiceExpandableListAdapter extends BaseExpandableListAdapter {
HashMap<String, ArrayList<Pair<String, String>>> hashmap;
Context mContext;
String[] selectedCategories;
TextView price;
ImageButton increment, decrement;
ConstraintLayout lowerLayout;
public static final ArrayList<String> POSSIBLECATEGORIES = new ArrayList<>(Collections.unmodifiableList(
Arrays.asList("Barber", "Braids", "Children", "Color", "Esthetician",
"Eyebrows", "Eyelashes", "Hair Extensions", "Haircut", "Make-Up",
"Massage", "Nails", "Natural Hair", "Straightening", "Style", "Tanning", "Twists", "Waxing", "Weaves")));
public ServiceExpandableListAdapter(Context context, HashMap<String, ArrayList<Pair<String, String>>> data) {
mContext = context;
hashmap = data;
selectedCategories = data.keySet().toArray(new String[data.size()]);
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater infalater = (LayoutInflater) this.mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalater.inflate(R.layout.group_heading, null);
}
TextView categoryName = (TextView) convertView.findViewById(R.id.service_category_tv);
ImageView groupHolder = (ImageView) convertView.findViewById(R.id.groupholder);
categoryName.setText(selectedCategories[groupPosition]);
return convertView;
}
@Override
public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) this.mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.child_row, parent, false);
//This one works properly
// convertView = inflater.inflate(R.layout.view, parent, false);
}
//return convertView;
String category = selectedCategories[groupPosition];
ServiceSelectionCheckbox checkbox = convertView.findViewById(R.id.service_selection_checkbox);
String service = hashmap.get(category).get(childPosition).first;
checkbox.setText(service);
// Pair of format <ServiceName, Price>
Pair<String, String> testPair = new Pair<>(hashmap.get(selectedCategories[groupPosition]).get(childPosition).first, hashmap.get(selectedCategories[groupPosition]).get(childPosition).second);
if (hashmap.containsValue(testPair)) {
checkbox.setChecked(true);
} else {
checkbox.setChecked(false);
}
return convertView;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return false;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public int getGroupCount() {
return this.hashmap.keySet().size();
}
@Override
public Object getChild(int groupPosition, int childPosition) {
return hashmap.get(selectedCategories[groupPosition]).get(childPosition);
}
@Override
public Object getGroup(int groupPosition) {
return hashmap.get(selectedCategories[groupPosition]);
}
@Override
public int getChildrenCount(int groupPosition) {
return hashmap.get(selectedCategories[groupPosition]).size();
}
}
这是自定义 UI 元素的 Java 文件。
ServiceSelectionCheckbox.java
public class ServiceSelectionCheckbox extends View implements View.OnClickListener {
private ConstraintLayout lowerLayout;
private ImageButton increment, decrement;
private float price;
private int quantity;
private TextView priceView, quantityView;
private CheckBox checkBox;
private boolean isQuantitySelectionVisible;
public ServiceSelectionCheckbox(Context context, AttributeSet attrs, String serviceName, String price, int quantity) {
super(context, attrs);
this.isQuantitySelectionVisible = true;
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = inflater.inflate(R.layout.service_selection_checkbox_layout, null);
priceView = (TextView) v.findViewById(R.id.service_selection_priceview);
checkBox = (CheckBox) v.findViewById(R.id.ssc_checkbox);
lowerLayout = (ConstraintLayout) v.findViewById(R.id.ssc_constraint_layout_quantity);
quantityView = (TextView) v.findViewById(R.id.ssc_service_quantity_countview);
increment = (ImageButton) v.findViewById(R.id.ssc_increase_service_count);
decrement = (ImageButton) v.findViewById(R.id.ssc_decrease_service_count);
}
public ServiceSelectionCheckbox(Context context) {
super(context);
this.init();
}
public ServiceSelectionCheckbox(Context context, AttributeSet attrs) {
super(context, attrs);
this.init();
}
private void init() {
this.isQuantitySelectionVisible = false;
LayoutInflater inflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = inflater.inflate(R.layout.service_selection_checkbox_layout, null);
priceView = (TextView) v.findViewById(R.id.service_selection_priceview);
checkBox = (CheckBox) v.findViewById(R.id.ssc_checkbox);
this.setOnClickListener(this);
lowerLayout = (ConstraintLayout) v.findViewById(R.id.ssc_constraint_layout_quantity);
quantityView = (TextView) v.findViewById(R.id.ssc_service_quantity_countview);
increment = (ImageButton) v.findViewById(R.id.ssc_increase_service_count);
decrement = (ImageButton) v.findViewById(R.id.ssc_decrease_service_count);
}
public ServiceSelectionCheckbox(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.init();
}
@Override
public void onClick(View view) {
isQuantitySelectionVisible = !isQuantitySelectionVisible;
}
@Override
public boolean performClick() {
//set lowerlayout as visible based on visible variable
if (this.isQuantitySelectionVisible) {
lowerLayout.setVisibility(View.VISIBLE);
} else {
lowerLayout.setVisibility(View.GONE);
}
return super.performClick();
}
public void setPrice(float price) {
this.price = price;
this.priceView.setText(String.valueOf(price));
}
public void setQuantity(String quantity) {
this.quantity = Integer.parseInt(quantity);
}
public void setChecked(boolean b) {
this.checkBox.setChecked(b);
}
public void setText(String serviceName) {
this.checkBox.setText(serviceName);
}
}
这里是相应的XML个文件。
group_heading.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginTop="8dp"
android:orientation="horizontal">
<TextView
android:id="@+id/service_category_tv"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="start"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_weight="3"
android:fontFamily="sans-serif-light"
android:text="Categoy"
android:textSize="22sp"
android:background="@android:color/holo_orange_dark"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/groupholder"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="@+id/groupholder"
android:layout_width="24dp"
android:layout_height="24dp"
android:layout_gravity="end"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginTop="8dp"
android:foregroundGravity="right"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/service_category_tv"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
我认为这是给我带来问题的文件。
child_row.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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="wrap_content"
tools:layout_editor_absoluteY="81dp">
<com.example.gabriel.uitest.ServiceSelectionCheckbox
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/service_selection_checkbox"/>
</android.support.constraint.ConstraintLayout>
自行呈现，按预期创建了视图。
service_selection_checkbox_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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="wrap_content"
android:visibility="visible"
tools:layout_editor_absoluteY="81dp">
<CheckBox
android:id="@+id/ssc_checkbox"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:checked="false"
android:fontFamily="sans-serif-light"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:text="Service"
android:textAllCaps="true"
android:textSize="18sp"
app:layout_constraintBottom_toTopOf="@+id/ssc_constraint_layout_quantity"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/service_selection_priceview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:fontFamily="sans-serif-light"
android:gravity="start|center"
android:textSize="18sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
android:layout_marginRight="8dp" />
<android.support.constraint.ConstraintLayout
android:id="@+id/ssc_constraint_layout_quantity"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:visibility="visible"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/ssc_checkbox">
<ImageButton
android:id="@+id/ssc_decrease_service_count"
android:layout_width="36dp"
android:layout_height="36dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/ssc_service_quantity_countview"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/ssc_service_quantity_countview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginTop="8dp"
android:fontFamily="sans-serif-light"
android:gravity="center"
android:paddingEnd="8dp"
android:paddingLeft="8dp"
android:paddingRight="8dp"
android:paddingStart="8dp"
android:text="Quantity"
android:textSize="18sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/ssc_increase_service_count"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/ssc_decrease_service_count"
app:layout_constraintTop_toTopOf="parent" />
<ImageButton
android:id="@+id/ssc_increase_service_count"
android:layout_width="36dp"
android:layout_height="36dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/ssc_service_quantity_countview"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
</android.support.constraint.ConstraintLayout>
这是我为前面提到的测试目的添加的测试视图组件，这个可以正常工作。
view.xml
<?xml version="1.0" encoding="utf-8"?>
<View
android:background="@color/colorAccent"
android:layout_width="match_parent"
android:layout_height="20dp"
xmlns:android="http://schemas.android.com/apk/res/android">
</View>
您需要定义您的自定义视图，如前所述below.Add您对该视图的其他代码。我保持简单，以便您更容易理解。
public class CustomView extends ConstraintLayout {
public CustomView(Context context) {
super(context);
init();
}
public CustomView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public CustomView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
void init() {
inflate(getContext(), R.layout. service_selection_checkbox_layout, this);
}
}
除非需要，否则不要嵌套约束布局。在上面的 xml 中，您给出了一个约束布局本身，您可以创建相同的 UI.
我正在尝试在 Android 中创建一个可扩展列表视图，它使用自定义 UI 组件作为子视图，但我在实际渲染时遇到了问题。使用调试器跟踪我的应用程序时，我看到我的自定义 UI 对象已实例化并设置了数据，但它似乎没有添加到视图中，即使我在 [=18] 结束时返回视图=].
我的最终目标是制作一个自定义 UI 元素 ServiceSelectionCheckbox，我可以直接从布局面板拖放它。
我尝试直接为该组件膨胀 XML 以查看是否是我的 XML 出现了导致静默故障的问题，但它似乎膨胀得很好。我还尝试创建一个辅助的更简单的 UI 组件，它具有坚实的背景，看看我是否可以正确添加它，它做得很好。这让我认为我的问题出在我的自定义 UI 组件 ServiceSelectionCheckbox.java 上，但我似乎无法弄清楚那个问题是什么。我的 linter 没有抛出任何错误，我的 apk 编译正常。
如能为我指明正确的方向，我们将不胜感激。
MainActivity.java
public class MainActivity extends AppCompatActivity {
public HashMap<String, ArrayList<Pair<String, String>>> hashMapOfServices = new HashMap<>();
public ArrayList<Pair<String, String>> aList;
public ExpandableListView list;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
aList = new ArrayList<Pair<String, String>>();
aList.add(new Pair<>("Men's Haircut", "50.00"));
hashMapOfServices.put("Haircut", aList);
list = (ExpandableListView) this.findViewById(R.id.list);
list.setAdapter((ExpandableListAdapter) new ServiceExpandableListAdapter(this, this.hashMapOfServices));
}
}
这是我的自定义适配器
ServiceExpandableListAdapter.java
public class ServiceExpandableListAdapter extends BaseExpandableListAdapter {
HashMap<String, ArrayList<Pair<String, String>>> hashmap;
Context mContext;
String[] selectedCategories;
TextView price;
ImageButton increment, decrement;
ConstraintLayout lowerLayout;
public static final ArrayList<String> POSSIBLECATEGORIES = new ArrayList<>(Collections.unmodifiableList(
Arrays.asList("Barber", "Braids", "Children", "Color", "Esthetician",
"Eyebrows", "Eyelashes", "Hair Extensions", "Haircut", "Make-Up",
"Massage", "Nails", "Natural Hair", "Straightening", "Style", "Tanning", "Twists", "Waxing", "Weaves")));
public ServiceExpandableListAdapter(Context context, HashMap<String, ArrayList<Pair<String, String>>> data) {
mContext = context;
hashmap = data;
selectedCategories = data.keySet().toArray(new String[data.size()]);
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater infalater = (LayoutInflater) this.mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalater.inflate(R.layout.group_heading, null);
}
TextView categoryName = (TextView) convertView.findViewById(R.id.service_category_tv);
ImageView groupHolder = (ImageView) convertView.findViewById(R.id.groupholder);
categoryName.setText(selectedCategories[groupPosition]);
return convertView;
}
@Override
public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) this.mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.child_row, parent, false);
//This one works properly
// convertView = inflater.inflate(R.layout.view, parent, false);
}
//return convertView;
String category = selectedCategories[groupPosition];
ServiceSelectionCheckbox checkbox = convertView.findViewById(R.id.service_selection_checkbox);
String service = hashmap.get(category).get(childPosition).first;
checkbox.setText(service);
// Pair of format <ServiceName, Price>
Pair<String, String> testPair = new Pair<>(hashmap.get(selectedCategories[groupPosition]).get(childPosition).first, hashmap.get(selectedCategories[groupPosition]).get(childPosition).second);
if (hashmap.containsValue(testPair)) {
checkbox.setChecked(true);
} else {
checkbox.setChecked(false);
}
return convertView;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return false;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public int getGroupCount() {
return this.hashmap.keySet().size();
}
@Override
public Object getChild(int groupPosition, int childPosition) {
return hashmap.get(selectedCategories[groupPosition]).get(childPosition);
}
@Override
public Object getGroup(int groupPosition) {
return hashmap.get(selectedCategories[groupPosition]);
}
@Override
public int getChildrenCount(int groupPosition) {
return hashmap.get(selectedCategories[groupPosition]).size();
}
}
这是自定义 UI 元素的 Java 文件。
ServiceSelectionCheckbox.java
public class ServiceSelectionCheckbox extends View implements View.OnClickListener {
private ConstraintLayout lowerLayout;
private ImageButton increment, decrement;
private float price;
private int quantity;
private TextView priceView, quantityView;
private CheckBox checkBox;
private boolean isQuantitySelectionVisible;
public ServiceSelectionCheckbox(Context context, AttributeSet attrs, String serviceName, String price, int quantity) {
super(context, attrs);
this.isQuantitySelectionVisible = true;
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = inflater.inflate(R.layout.service_selection_checkbox_layout, null);
priceView = (TextView) v.findViewById(R.id.service_selection_priceview);
checkBox = (CheckBox) v.findViewById(R.id.ssc_checkbox);
lowerLayout = (ConstraintLayout) v.findViewById(R.id.ssc_constraint_layout_quantity);
quantityView = (TextView) v.findViewById(R.id.ssc_service_quantity_countview);
increment = (ImageButton) v.findViewById(R.id.ssc_increase_service_count);
decrement = (ImageButton) v.findViewById(R.id.ssc_decrease_service_count);
}
public ServiceSelectionCheckbox(Context context) {
super(context);
this.init();
}
public ServiceSelectionCheckbox(Context context, AttributeSet attrs) {
super(context, attrs);
this.init();
}
private void init() {
this.isQuantitySelectionVisible = false;
LayoutInflater inflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = inflater.inflate(R.layout.service_selection_checkbox_layout, null);
priceView = (TextView) v.findViewById(R.id.service_selection_priceview);
checkBox = (CheckBox) v.findViewById(R.id.ssc_checkbox);
this.setOnClickListener(this);
lowerLayout = (ConstraintLayout) v.findViewById(R.id.ssc_constraint_layout_quantity);
quantityView = (TextView) v.findViewById(R.id.ssc_service_quantity_countview);
increment = (ImageButton) v.findViewById(R.id.ssc_increase_service_count);
decrement = (ImageButton) v.findViewById(R.id.ssc_decrease_service_count);
}
public ServiceSelectionCheckbox(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.init();
}
@Override
public void onClick(View view) {
isQuantitySelectionVisible = !isQuantitySelectionVisible;
}
@Override
public boolean performClick() {
//set lowerlayout as visible based on visible variable
if (this.isQuantitySelectionVisible) {
lowerLayout.setVisibility(View.VISIBLE);
} else {
lowerLayout.setVisibility(View.GONE);
}
return super.performClick();
}
public void setPrice(float price) {
this.price = price;
this.priceView.setText(String.valueOf(price));
}
public void setQuantity(String quantity) {
this.quantity = Integer.parseInt(quantity);
}
public void setChecked(boolean b) {
this.checkBox.setChecked(b);
}
public void setText(String serviceName) {
this.checkBox.setText(serviceName);
}
}
这里是相应的XML个文件。
group_heading.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginTop="8dp"
android:orientation="horizontal">
<TextView
android:id="@+id/service_category_tv"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="start"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_weight="3"
android:fontFamily="sans-serif-light"
android:text="Categoy"
android:textSize="22sp"
android:background="@android:color/holo_orange_dark"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/groupholder"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="@+id/groupholder"
android:layout_width="24dp"
android:layout_height="24dp"
android:layout_gravity="end"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginTop="8dp"
android:foregroundGravity="right"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/service_category_tv"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
我认为这是给我带来问题的文件。
child_row.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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="wrap_content"
tools:layout_editor_absoluteY="81dp">
<com.example.gabriel.uitest.ServiceSelectionCheckbox
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/service_selection_checkbox"/>
</android.support.constraint.ConstraintLayout>
自行呈现，按预期创建了视图。 service_selection_checkbox_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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="wrap_content"
android:visibility="visible"
tools:layout_editor_absoluteY="81dp">
<CheckBox
android:id="@+id/ssc_checkbox"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:checked="false"
android:fontFamily="sans-serif-light"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:text="Service"
android:textAllCaps="true"
android:textSize="18sp"
app:layout_constraintBottom_toTopOf="@+id/ssc_constraint_layout_quantity"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/service_selection_priceview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:fontFamily="sans-serif-light"
android:gravity="start|center"
android:textSize="18sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
android:layout_marginRight="8dp" />
<android.support.constraint.ConstraintLayout
android:id="@+id/ssc_constraint_layout_quantity"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:visibility="visible"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/ssc_checkbox">
<ImageButton
android:id="@+id/ssc_decrease_service_count"
android:layout_width="36dp"
android:layout_height="36dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/ssc_service_quantity_countview"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/ssc_service_quantity_countview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginTop="8dp"
android:fontFamily="sans-serif-light"
android:gravity="center"
android:paddingEnd="8dp"
android:paddingLeft="8dp"
android:paddingRight="8dp"
android:paddingStart="8dp"
android:text="Quantity"
android:textSize="18sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/ssc_increase_service_count"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/ssc_decrease_service_count"
app:layout_constraintTop_toTopOf="parent" />
<ImageButton
android:id="@+id/ssc_increase_service_count"
android:layout_width="36dp"
android:layout_height="36dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/ssc_service_quantity_countview"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
</android.support.constraint.ConstraintLayout>
这是我为前面提到的测试目的添加的测试视图组件，这个可以正常工作。 view.xml
<?xml version="1.0" encoding="utf-8"?>
<View
android:background="@color/colorAccent"
android:layout_width="match_parent"
android:layout_height="20dp"
xmlns:android="http://schemas.android.com/apk/res/android">
</View>
您需要定义您的自定义视图，如前所述below.Add您对该视图的其他代码。我保持简单，以便您更容易理解。
public class CustomView extends ConstraintLayout {
public CustomView(Context context) {
super(context);
init();
}
public CustomView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public CustomView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
void init() {
inflate(getContext(), R.layout. service_selection_checkbox_layout, this);
}
}
除非需要，否则不要嵌套约束布局。在上面的 xml 中，您给出了一个约束布局本身，您可以创建相同的 UI.