我已经通过扩展FrameLayout创建了一个复合视图。我在xml文件中测试了这个组件，它的工作正常，但是当我在约束布局中动态添加该组件时，它没有显示，当我在组件的xml中设置特定高度时，在每种情况下它的工作都很好，但是没有在其中显示TextViews ，以下是用于动态创建此组件的代码：
WelcomeNoteView welcomeNoteView = new WelcomeNoteView(this);
welcomeNoteView.setLayoutParams(new ConstraintLayout.LayoutParams
(ConstraintLayout.LayoutParams.MATCH_PARENT,
ConstraintLayout.LayoutParams.WRAP_CONTENT));
welcomeNoteView.setTitle(R.string.title_box_detail_welcome);
welcomeNoteView.setSubTitle(R.string.message_box_detail_welcome);
welcomeNoteView.setTitleGravity(Gravity.START);
welcomeNoteView.setSubTitleGravity(Gravity.START);
welcomeNoteView.setTitleFont(ResourcesCompat.getFont(context, R.font.helvetica));
welcomeNoteView.setSubTitleFont(ResourcesCompat.getFont(context, R.font.helvetica));
welcomeNoteView.setTitleTextSize(R.dimen.welcome_card_header_large_text_size);
welcomeNoteView.setSubTitleTextSize(R.dimen.welcome_card_header_subtitle_text_size);
welcomeNoteView.setTopBottomTitlePadding(R.dimen.box_detail_welcome_card_title_padding_top, R.dimen.zero);
welcomeNoteView.setTopBottomSubTitlePadding(R.dimen.box_detail_welcome_card_subtitle_padding_top, R.dimen.box_detail_welcome_card_subtitle_padding_bottom);
welcomeNoteView.setId(View.generateViewId());
binding.parentLayout.addView(welcomeNoteView);
ConstraintSet constraintSet = new ConstraintSet();
constraintSet.clone(binding.parentLayout);
constraintSet.connect(welcomeNoteView.getId(), ConstraintSet.START,
binding.backIv.getId(), ConstraintSet.START);
constraintSet.connect(welcomeNoteView.getId(), ConstraintSet.END,
ConstraintSet.PARENT_ID, ConstraintSet.END);
constraintSet.connect(welcomeNoteView.getId(), ConstraintSet.TOP,
binding.tvTitle.getId(), ConstraintSet.BOTTOM);
constraintSet.connect(binding.swipeRefreshLayout.getId(), ConstraintSet.TOP,
welcomeNoteView.getId(), ConstraintSet.BOTTOM);
constraintSet.connect(binding.slEffect.getId(), ConstraintSet.TOP,
welcomeNoteView.getId(), ConstraintSet.BOTTOM);
constraintSet.applyTo(binding.parentLayout);
班级：
@BindingMethods({
@BindingMethod(type = WelcomeNoteView.class, attribute = "title", method = "setTitle")
})
public class WelcomeNoteView extends FrameLayout {
private LayoutWelcomeNoteViewBinding itemViewBinding;
public WelcomeNoteView(Context context) {
super(context);
initializeView(context, null, 0);
}
public WelcomeNoteView(Context context, AttributeSet attrs) {
super(context, attrs);
initializeView(context, attrs, 0);
}
public WelcomeNoteView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initializeView(context, attrs, defStyleAttr);
}
private void initializeView(Context context, AttributeSet attrs, int defStyleAttr) {
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.WelcomeNoteView,
defStyleAttr, 0);
String title = null, subTitle = null;
int subTitleLines = 1;
int titleFont = -1;
int subTitleFont = -1;
int titleGravity = -1;
int subTitleGravity = -1;
float titleTextSize = -1;
float subTitleTextSize = -1;
float titlePaddingTop = 0;
float titlePaddingBottom = 0;
float subTitlePaddingTop = 0;
float subTitlePaddingBottom = 0;
try {
int n = a.getIndexCount();
for (int i = 0; i < n; i++) {
int attr = a.getIndex(i);
switch (attr) {
case R.styleable.WelcomeNoteView_title:
title = a.getString(attr);
break;
case R.styleable.WelcomeNoteView_subTitle:
subTitle = a.getString(attr);
break;
case R.styleable.WelcomeNoteView_subTitleLines:
subTitleLines = a.getInt(attr, subTitleLines);
break;
case R.styleable.WelcomeNoteView_titleFont:
titleFont = a.getResourceId(attr, R.font.sfui_text_semibold);
break;
case R.styleable.WelcomeNoteView_subTitleFont:
subTitleFont = a.getResourceId(attr, R.font.sfui_text_semibold);
break;
case R.styleable.WelcomeNoteView_titleTextSize:
titleTextSize = a.getDimension(attr, R.dimen.welcome_card_header_large_text_size);
break;
case R.styleable.WelcomeNoteView_subTitleTextSize:
subTitleTextSize = a.getDimension(attr, R.dimen.welcome_card_header_subtitle_text_size);
break;
case R.styleable.WelcomeNoteView_titleGravity:
titleGravity = a.getInteger(attr, Gravity.CENTER);
break;
case R.styleable.WelcomeNoteView_subTitleGravity:
subTitleGravity = a.getInteger(attr, Gravity.CENTER);
break;
case R.styleable.WelcomeNoteView_titlePaddingTop:
titlePaddingTop = a.getDimension(attr, R.dimen.zero);
break;
case R.styleable.WelcomeNoteView_subTitlePaddingTop:
subTitlePaddingTop = a.getDimension(attr, R.dimen.zero);
break;
case R.styleable.WelcomeNoteView_titlePaddingBottom:
titlePaddingBottom = a.getDimension(attr, R.dimen.zero);
break;
case R.styleable.WelcomeNoteView_subTitlePaddingBottom:
subTitlePaddingBottom = a.getDimension(attr, R.dimen.zero);
break;
default:
AppLogger.d("SignUpTitleView", "Unknown attribute for " + getClass().toString() + ": " + attr);
break;
}
}
} finally {
a.recycle();
}
itemViewBinding = LayoutWelcomeNoteViewBinding.inflate(LayoutInflater.from(context),
this, true);
if (!TextUtils.isEmpty(title))
setTitle(title);
if (!TextUtils.isEmpty(subTitle))
setSubTitle(subTitle);
if (subTitleLines > 1) {
itemViewBinding.tvSubTitle.setLines(subTitleLines);
}
if (titleFont > -1)
setTitleFont(ResourcesCompat.getFont(context, titleFont));
if (subTitleFont > -1)
setSubTitleFont(ResourcesCompat.getFont(context, subTitleFont));
if (titleTextSize > -1)
setTitleTextSize(titleTextSize);
if (subTitleTextSize > -1)
setSubTitleTextSize(subTitleTextSize);
if (titleGravity > -1)
setTitleGravity(titleGravity);
if (subTitleGravity > -1)
setSubTitleGravity(titleGravity);
setTopBottomTitlePadding((int) titlePaddingTop, (int) titlePaddingBottom);
setTopBottomSubTitlePadding((int) subTitlePaddingTop, (int) subTitlePaddingBottom);
}
public void setTitleGravity(int titleGravity) {
itemViewBinding.tvTitle.setGravity(titleGravity);
}
public void setSubTitleGravity(int titleGravity) {
itemViewBinding.tvSubTitle.setGravity(titleGravity);
}
public void setTitleTextSize(float titleTextSize) {
itemViewBinding.tvTitle.setTextSize(TypedValue.COMPLEX_UNIT_PX, titleTextSize);
}
public void setSubTitleTextSize(float titleTextSize) {
itemViewBinding.tvSubTitle.setTextSize(TypedValue.COMPLEX_UNIT_PX, titleTextSize);
}
public void setTitleFont(Typeface font) {
itemViewBinding.tvTitle.setTypeface(font);
}
public void setSubTitleFont(Typeface font) {
itemViewBinding.tvSubTitle.setTypeface(font);
}
public void setTopBottomSubTitlePadding(int subTitlePaddingTop, int subTitlePaddingBottom) {
itemViewBinding.tvSubTitle.setPadding(0, (int) subTitlePaddingTop,
0, (int) subTitlePaddingBottom);
}
public void setTopBottomTitlePadding(int titlePaddingTop, int titlePaddingBottom) {
itemViewBinding.tvTitle.setPadding(0, (int) titlePaddingTop,
0, (int) titlePaddingBottom);
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
}
public TextView getTitleTextView() {
return itemViewBinding.tvTitle;
}
public String getTitle() {
return itemViewBinding.tvTitle.getText().toString();
}
public void setTitle(@StringRes int resId) {
itemViewBinding.tvTitle.setText(resId);
}
public void setTitle(String text) {
itemViewBinding.tvTitle.setText(text);
}
public TextView getSubTitleTextView() {
return itemViewBinding.tvSubTitle;
}
public String getSubTitle() {
return itemViewBinding.tvSubTitle.getText().toString();
}
public void setSubTitle(@StringRes int resId) {
setSubTitle(getContext().getString(resId));
}
public void setSubTitle(String text) {
if (!TextUtils.isEmpty(text)) {
itemViewBinding.tvSubTitle.setText(text);
} else
itemViewBinding.tvSubTitle.setText("");
}
}
这是组件的xml：
<?xml version="1.0" encoding="utf-8"?>
<layout 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">
<data>
</data>
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/bg_welcome_card"
android:clipToPadding="false"
android:shadowColor="#4746bbc2"
android:shadowDy="22.5"
android:shadowRadius="10.4">
<TextView
android:id="@+id/tvTitle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="@dimen/welcome_card_head_side_margins"
android:layout_marginRight="@dimen/welcome_card_head_side_margins"
android:fontFamily="@font/sfui_text_semibold"
android:gravity="center_horizontal"
android:letterSpacing="-0.01"
android:textColor="#ffffff"
android:textSize="@dimen/welcome_card_header_large_text_size"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:text="@string/title_home_welcome" />
<TextView
android:id="@+id/tvSubTitle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:fontFamily="@font/sfui_text_regular"
android:letterSpacing="-0.01"
android:lineSpacingExtra="6.1sp"
android:textColor="#ffffff"
android:textSize="@dimen/welcome_card_header_subtitle_text_size"
app:layout_constraintEnd_toEndOf="@+id/tvTitle"
app:layout_constraintStart_toStartOf="@+id/tvTitle"
app:layout_constraintTop_toBottomOf="@+id/tvTitle"
tools:text="@string/message_home_welcome" />
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>