Android:使用ConstraintLayout

时间:2018-05-23 11:47:37

标签: android android-constraintlayout

我正在使用 ConstraintLayout 进行布局。我正在创建 BottomSheetDialog 并将布局设置为使用顶部的 ConstraintLayout

  

注意:如果我使用LinearLayout一切正常,BottomSheetDialog需要适当的高度但是当我使用时   ConstraintLayout,它只显示一个选项。

当我使用ConstraintLayout时,请查看下面的屏幕截图:

enter image description here

我的xml文件:

<?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"
    android:orientation="vertical"
    android:background="@color/white">

    <TextView
        android:id="@+id/tv_other_methods"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/ripple"
        android:gravity="center_horizontal"
        android:padding="@dimen/dp_12"
        android:text="@string/from_other_methods"
        android:textColor="@color/blue"
        android:textSize="@dimen/sp_17" />

    <View
        android:id="@+id/view_other_methods"
        android:layout_width="match_parent"
        android:layout_height="@dimen/dip_1"
        android:background="@color/light_grey"
        app:layout_constraintBottom_toBottomOf="@id/tv_other_methods" />

    <TextView
        android:id="@+id/tv_FromChinaUnionPay"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/ripple"
        android:gravity="center_horizontal"
        android:padding="@dimen/dp_12"
        android:text="@string/from_china_union_pay"
        android:textColor="@color/blue"
        android:textSize="@dimen/sp_17"
        app:layout_constraintBottom_toBottomOf="@id/view_other_methods"
        app:layout_constraintTop_toTopOf="@id/view_FromChinaUnionPay" />

    <View
        android:id="@+id/view_FromChinaUnionPay"
        android:layout_width="match_parent"
        android:layout_height="@dimen/dip_1"
        android:background="@color/light_grey"
        app:layout_constraintBottom_toBottomOf="@id/tv_FromChinaUnionPay" />

    <TextView
        android:id="@+id/tv_Cancel"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/ripple"
        android:gravity="center_horizontal"
        android:padding="@dimen/dp_12"
        android:text="@string/cancel"
        android:textColor="@color/blue"
        android:textSize="@dimen/sp_17"
        app:layout_constraintTop_toBottomOf="@+id/view_FromChinaUnionPay" />
</android.support.constraint.ConstraintLayout>

我的BottomSheetDialog的java代码:

final BottomSheetDialog bottomSheetDialog = new BottomSheetDialog(mContext);
            bottomSheetDialog.setContentView(R.layout.dialog_web_view_options);
            // dialog.setCancelable(false);
            final Window window = bottomSheetDialog.getWindow();
            assert window != null;
            window.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
            window.setLayout(ActionBar.LayoutParams.MATCH_PARENT, ActionBar.LayoutParams.WRAP_CONTENT);
            window.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
            window.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);
            window.getDecorView().setPadding(20, 0, 20, 0);

            bottomSheetDialog.setOnShowListener(new DialogInterface.OnShowListener() {
                @Override
                public void onShow(DialogInterface dialog) {
                    FrameLayout bottomSheet = bottomSheetDialog.findViewById(android.support.design.R.id.design_bottom_sheet);
                    BottomSheetBehavior behavior = BottomSheetBehavior.from(bottomSheet);
                    behavior.setSkipCollapsed(true);
                    behavior.setState(BottomSheetBehavior.STATE_EXPANDED);
                }
            });

在我的布局中,如果我用 LinearLayout 替换 ConstraintLayout ,那么它可以正常工作并占据全高。如果我做错了,请告诉我。使用 LinearLayout 时的屏幕截图:

enter image description here

我尝试过这些解决方案,但没有任何效果:

任何帮助将不胜感激。谢谢!

1 个答案:

答案 0 :(得分:0)

您尚未限制所有观看次数 - 第一个TextView没有任何限制。您添加的约束未正确指定,无法按垂直顺序正确显示视图。我建议创建所有视图的垂直链,并将父ConstraintLayout's layout_height设置为wrap_content。 XML应如下所示:

<?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="wrap_content"
    android:background="@color/white">

    <TextView
        android:id="@+id/tv_other_methods"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:background="@drawable/ripple"
        android:gravity="center_horizontal"
        android:padding="@dimen/dp_12"
        android:text="@string/from_other_methods"
        android:textColor="@color/blue"
        android:textSize="@dimen/sp_17"
        app:layout_constraintBottom_toTopmOf="@id/view_other_methods"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <View
        android:id="@+id/view_other_methods"
        android:layout_width="0dp"
        android:layout_height="@dimen/dip_1"
        android:background="@color/light_grey"
        app:layout_constraintBottom_toTopOf="@id/tv_FromChinaUnionPay"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/tv_other_methods" />

    <TextView
        android:id="@+id/tv_FromChinaUnionPay"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:background="@drawable/ripple"
        android:gravity="center_horizontal"
        android:padding="@dimen/dp_12"
        android:text="@string/from_china_union_pay"
        android:textColor="@color/blue"
        android:textSize="@dimen/sp_17"
        app:layout_constraintBottom_toTopOf="@id/view_FromChinaUnionPay"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/view_other_methods" />

    <View
        android:id="@+id/view_FromChinaUnionPay"
        android:layout_width="0dp"
        android:layout_height="@dimen/dip_1"
        android:background="@color/light_grey"
        app:layout_constraintBottom_toTopOf="@id/tv_Cancel"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/tv_FromChinaUnionPay" />

    <TextView
        android:id="@+id/tv_Cancel"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:background="@drawable/ripple"
        android:gravity="center_horizontal"
        android:padding="@dimen/dp_12"
        android:text="@string/cancel"
        android:textColor="@color/blue"
        android:textSize="@dimen/sp_17"
        app:layout_constraintTop_toBottomOf="@+id/view_FromChinaUnionPay"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>
</android.support.constraint.ConstraintLayout>

作为旁注,建议不要对match_parent内的任何观点使用ConstraintLayout,因为文档建议:

  

重要提示:不建议对ConstraintLayout中包含的小部件使用MATCH_PARENT。可以使用MATCH_CONSTRAINT定义类似的行为,并将相应的左/右或上/下约束设置为&#34; parent&#34;。