我希望你能解决我的问题。我试图谷歌它，并在这里查看主题，但无法找到答案。
我最近将布局更改为ConstraintLayouts，到目前为止，这种方式一直很好用。然而，我的问题是我有一些DialogFragments显示LinearLayout，当我将其更改为ConstraintLayout时，我只显示了一个褪色的叠加层，但没有显示布局中的元素。如果我将宽度和高度硬编码为100dp，它将显示该区域。当我尝试match_parent或任何其他组合时，同样的问题也适用。我也尝试将高度和宽度设置为设备的高度和宽度，但仍然没有运气。
在我的CreateWeddingMetadataFragment中的onCreateView中，我有：
createButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d(TAG, "Show message dialog");
FragmentManager fm = getFragmentManager();
CreateWeddingMetadataDialogFragment welcomeMessageDialog = new CreateWeddingMetadataDialogFragment();
welcomeMessageDialog.show(fm, "metadate_fragment_dialog");
welcomeMessageDialog.setOnDismissListener(new DialogInterface.OnDismissListener() {
@Override
public void onDismiss(DialogInterface dialog) {
}
});
在我的CreateWeddingMetadataFragmentDialog中，我有：
public class CreateWeddingMetadataDialogFragment extends DialogFragment{
private static final String TAG = CreateWeddingMetadataDialogFragment.class.getSimpleName();
public Button setupNow, setupLater;
public TextView mTest;
public ConstraintLayout parentLayout;
private DialogInterface.OnDismissListener onDismissListener;
public void setOnDismissListener(DialogInterface.OnDismissListener onDismissListener) {
this.onDismissListener = onDismissListener;
}
@Override
public void onDismiss(DialogInterface dialog) {
super.onDismiss(dialog);
if (onDismissListener != null) {
onDismissListener.onDismiss(dialog);
}
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d(TAG, "I was called");
}
public CreateWeddingMetadataDialogFragment(){}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.create_welcome_message_view, container);
setupNow = (Button) view.findViewById(R.id.setupNowButton);
setupLater = (Button) view.findViewById(R.id.setupLaterButton);
mTest = (TextView) view.findViewById(R.id.welcomeMessageTitle);
parentLayout = (ConstraintLayout) view.findViewById(R.id.clWelcomeMessage);
DisplayMetrics displayMetrics = getResources().getDisplayMetrics();
int width = displayMetrics.widthPixels;
int height = displayMetrics.heightPixels;
parentLayout.setMinimumWidth(width);
parentLayout.setMinimumHeight(height);
mTest.setText("Test");
Log.d(TAG, "I was called onCreateView" + mTest);
setupNow.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//Go to metadate page (Hide this dialog)
}
});
setupLater.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//Go to signin page and create the wedding
}
});
return view;
}
}
这是我目前尝试将其设置为设备大小。
这是create_welcome_message_view：
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:id="@+id/clWelcomeMessage">
<Button
android:text="DET GØR JEG SENERE"
android:layout_width="0dp"
android:layout_height="0dp"
android:id="@+id/setupLaterButton"
app:layout_constraintTop_toTopOf="@+id/guideline19"
app:layout_constraintBottom_toTopOf="@+id/guideline20"
android:layout_marginEnd="16dp"
app:layout_constraintRight_toRightOf="parent"
android:layout_marginRight="16dp"
android:layout_marginStart="16dp"
app:layout_constraintLeft_toLeftOf="parent"
android:layout_marginLeft="16dp"
android:background="@drawable/border"
android:layout_marginTop="2dp"
android:textColor="@color/colorPrimaryDark"/>
<Button
android:text="JEG VIL OPSÆTTE DEN NU"
android:layout_width="0dp"
android:layout_height="0dp"
android:id="@+id/setupNowButton"
app:layout_constraintTop_toTopOf="@+id/guideline12"
app:layout_constraintBottom_toTopOf="@+id/guideline19"
android:layout_marginEnd="16dp"
app:layout_constraintRight_toRightOf="parent"
android:layout_marginRight="16dp"
android:layout_marginStart="16dp"
app:layout_constraintLeft_toLeftOf="parent"
android:layout_marginLeft="16dp"
android:background="@color/colorPrimaryDark"
android:layout_marginBottom="2dp"
android:textColor="@color/White"/>
<TextView
android:text="EN PERSONLIG VELKOMST"
android:layout_width="0dp"
android:layout_height="0dp"
android:id="@+id/welcomeMessageTitle"
android:layout_marginTop="16dp"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginEnd="32dp"
app:layout_constraintRight_toRightOf="parent"
android:layout_marginRight="32dp"
android:layout_marginStart="32dp"
app:layout_constraintLeft_toLeftOf="parent"
android:layout_marginLeft="32dp"
app:layout_constraintBottom_toTopOf="@+id/textView5"
android:layout_marginBottom="8dp"
android:textAlignment="center"
android:textSize="16sp"/>
<TextView
android:text="Nu skal I definere den velkomst, som jeres gæster får i appen. I kan skrive navnet på brylluppet, en hlsen og har mulighed at vælge et coverbillede"
android:layout_width="0dp"
android:layout_height="0dp"
android:id="@+id/textView5"
app:layout_constraintTop_toTopOf="@+id/guideline14"
android:layout_marginEnd="32dp"
app:layout_constraintRight_toRightOf="parent"
android:layout_marginRight="32dp"
app:layout_constraintBottom_toTopOf="@+id/textView6"
android:layout_marginBottom="8dp"
android:layout_marginStart="32dp"
app:layout_constraintLeft_toLeftOf="parent"
android:layout_marginLeft="32dp"
android:textAlignment="center"/>
<android.support.constraint.Guideline
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/guideline12"
android:orientation="horizontal"
tools:layout_editor_absoluteY="204dp"
tools:layout_editor_absoluteX="0dp"
app:layout_constraintGuide_percent="0.4"/>
<TextView
android:text="Du vil altid kunne ændre din opsætning af velkomsten i din brugerprofil."
android:layout_width="0dp"
android:layout_height="0dp"
android:id="@+id/textView6"
app:layout_constraintBottom_toTopOf="@+id/guideline12"
android:layout_marginBottom="8dp"
app:layout_constraintTop_toTopOf="@+id/guideline15"
android:layout_marginStart="32dp"
app:layout_constraintLeft_toLeftOf="parent"
android:layout_marginLeft="32dp"
android:layout_marginEnd="32dp"
app:layout_constraintRight_toRightOf="parent"
android:layout_marginRight="32dp"
android:textAlignment="center"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintVertical_bias="1.0"/>
<android.support.constraint.Guideline
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/guideline14"
android:orientation="horizontal"
tools:layout_editor_absoluteY="51dp"
tools:layout_editor_absoluteX="0dp"
app:layout_constraintGuide_percent="0.1"/>
<android.support.constraint.Guideline
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/guideline15"
android:orientation="horizontal"
tools:layout_editor_absoluteY="153dp"
tools:layout_editor_absoluteX="0dp"
app:layout_constraintGuide_percent="0.3"/>
<android.support.constraint.Guideline
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/guideline19"
android:orientation="horizontal"
tools:layout_editor_absoluteY="255dp"
tools:layout_editor_absoluteX="0dp"
app:layout_constraintGuide_percent="0.5"/>
<android.support.constraint.Guideline
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/guideline20"
android:orientation="horizontal"
tools:layout_editor_absoluteY="305dp"
tools:layout_editor_absoluteX="0dp"
app:layout_constraintGuide_percent="0.6"/>
</android.support.constraint.ConstraintLayout>
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答案 0 :(得分：2)
这很好用 - 看看
1）良好的做法是尽可能在XML中按顺序排列项目。只是为了以后容易理解。 2）它看起来每个其他元素都限制自己的高度和宽度，并且主要导致0高度和宽度。注意LayoutParams上的0dp和wrap_content。 3）也支持Vertical Bias。
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
android:id="@+id/clWelcomeMessage"
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:orientation="vertical">
<android.support.constraint.Guideline
android:id="@+id/guideline_ver_16"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_begin="@dimen/sixteenDP"/>
<android.support.constraint.Guideline
android:id="@+id/guideline_ver_end_16"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_end="@dimen/sixteenDP"/>
<TextView
android:id="@+id/welcomeMessageTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="32dp"
android:layout_marginLeft="32dp"
android:layout_marginRight="32dp"
android:layout_marginStart="32dp"
android:layout_marginTop="16dp"
android:text="EN PERSONLIG VELKOMST"
android:textAlignment="center"
android:textSize="16sp"
app:layout_constraintBottom_toTopOf="@+id/textView5"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
<android.support.constraint.Guideline
android:id="@+id/guideline1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.1"/>
<android.support.constraint.Guideline
android:id="@+id/guideline2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.2"/>
<TextView
android:id="@+id/textView5"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:text="Nu skal I definere den velkomst, som jeres gæster får i
appen.
I kan skrive navnet på brylluppet, en hlsen og har mulighed at vælge et
coverbillede"
android:textAlignment="center"
app:layout_constraintEnd_toEndOf="@+id/guideline_ver_end_16"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="@+id/guideline_ver_16"
app:layout_constraintTop_toBottomOf="@+id/guideline2"/>
<TextView
android:id="@+id/textView6"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="16dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_marginStart="16dp"
android:layout_marginTop="8dp"
android:text="Du vil altid kunne ændre din opsætning af velkomsten i din
brugerprofil."
android:textAlignment="center"
app:layout_constraintBottom_toTopOf="@+id/setupNowButton"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintLeft_toLeftOf="@+id/guideline_ver_16"
app:layout_constraintRight_toRightOf="@+id/guideline_ver_end_16"
app:layout_constraintTop_toBottomOf="@+id/textView5"/>
<Button
android:id="@+id/setupNowButton"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="16dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_marginStart="16dp"
android:layout_marginTop="8dp"
android:background="@color/colorPrimaryDark"
android:text="JEG VIL OPSÆTTE DEN NU"
android:textColor="@color/White"
app:layout_constraintBottom_toTopOf="@+id/setupLaterButton"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView6"
app:layout_constraintVertical_bias="1.0"/>
<android.support.constraint.Guideline
android:id="@+id/guideline6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.6"/>
<Button
android:id="@+id/setupLaterButton"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="16dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_marginStart="16dp"
android:text="DET GØR JEG SENERE"
android:background="@drawable/border"
android:textColor="@color/colorPrimaryDark"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="@+id/guideline6"
app:layout_constraintVertical_bias="1.0"/>
</android.support.constraint.ConstraintLayout>
此外，app:layout_constraintWidth_default="wrap"（ 宽度设置为0dp ）。如果设置，窗口小部件将具有与使用wrap_content相同的大小，但将受到约束的限制（即，它不会扩展超出它们）。
Supporting resource