Question

我正在尝试在我的代码中实现ContstraintLayout，但问题是当我在模拟器和IDE中运行它时有什么不同？对于这些信息，我将ConstraintLayout放在LinearLayout垂直中。这里是我的XML代码：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/content_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:showIn="@layout/app_bar_main"
    tools:context="navotera.syasep.MainActivity">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:weightSum="1"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true">

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="170dp"
            >

            <RelativeLayout
                android:id="@+id/topBorder"
                android:layout_width="match_parent"
                android:layout_height="80dp"
                android:background="@android:color/holo_red_light">

            </RelativeLayout>

            <ImageView
                android:layout_width="match_parent"
                android:layout_height="100dp"
                android:scaleType="fitCenter"
                android:foregroundGravity="right"
                android:src="@mipmap/profile"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintHorizontal_bias="0.99"
                android:id="@+id/imageView3"
                app:layout_constraintVertical_bias="0.25"
                android:paddingLeft="270dp" />

            <LinearLayout
                android:orientation="vertical"
                android:layout_width="match_parent"
                android:paddingLeft="18dp"
                android:paddingTop="10dp"
                android:layout_height="match_parent"
                android:layout_alignParentTop="true"
                android:layout_alignParentLeft="true"
                android:layout_alignParentStart="true">

                <TextView
                    android:textSize="@dimen/text_big"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:id="@+id/nama"
                    android:text="Hendra" />

                <TextView
                    android:textSize="@dimen/text_big"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:id="@+id/nim"
                    android:text="nim" />

                <android.support.constraint.ConstraintLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:foregroundGravity="right">

                    <TextView
                        android:textSize="@dimen/text_bigger"
                        android:layout_width="0dp"
                        android:layout_height="wrap_content"
                        android:id="@+id/semester"
                        android:text="7"
                        android:layout_weight="1"
                        android:layout_marginEnd="184dp"
                        app:layout_constraintRight_toRightOf="parent"
                        android:layout_marginRight="184dp"
                        app:layout_constraintTop_toBottomOf="@+id/tsemester" />

                    <TextView
                        android:text="IPK"
                        android:textSize="@dimen/text_small"
                        android:layout_width="88dp"
                        android:layout_height="wrap_content"
                        android:id="@+id/tipk"
                        android:textColor="@color/colorAccent"
                        android:layout_weight="1"
                        tools:layout_editor_absoluteY="28dp"
                        app:layout_constraintRight_toLeftOf="@+id/tsemester"
                        android:layout_marginEnd="48dp"
                        android:layout_marginRight="48dp"
                        app:layout_constraintLeft_toLeftOf="@+id/ipk" />

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:id="@+id/ipk"
                        android:text="3.99"
                        android:textSize="@dimen/text_bigger"
                        android:layout_weight="1"
                        tools:layout_editor_absoluteY="49dp"
                        app:layout_constraintLeft_toLeftOf="parent"
                        android:layout_marginStart="16dp"
                        android:layout_marginLeft="16dp"
                        app:layout_constraintRight_toLeftOf="@+id/semester"
                        android:layout_marginEnd="8dp"
                        android:layout_marginRight="8dp"
                        app:layout_constraintHorizontal_bias="0.14" />

                    <TextView
                        android:text="Semester"
                        android:textSize="@dimen/text_small"
                        android:layout_width="94dp"
                        android:layout_height="wrap_content"
                        android:id="@+id/tsemester"
                        android:textColor="@color/colorAccent"
                        android:layout_weight="1"
                        tools:layout_editor_absoluteY="28dp"
                        tools:layout_editor_absoluteX="156dp" />
                </android.support.constraint.ConstraintLayout>
            </LinearLayout>


        </RelativeLayout>


        <android.support.constraint.ConstraintLayout
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">


        </android.support.constraint.ConstraintLayout>

        <TextView
            android:text="Jadwal / Kehadiran"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:paddingLeft="13dp"
            android:id="@+id/tkehadiran"
            android:textSize="@dimen/text_medium" />

    </LinearLayout>

</RelativeLayout>

感谢任何建议。

Answer 1

如果使用ConstraintLayout，则将所有视图作为ConstraintLayout的直接子项放置，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"
   xmlns:tools="http://schemas.android.com/tools"                                                        android:layout_width="match_parent"
   android:layout_height="match_parent"
android:orientation="vertical">

<Button
    android:text="Button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/button" android:layout_marginEnd="16dp"
    app:layout_constraintRight_toRightOf="parent" android:layout_marginStart="16dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintBottom_toBottomOf="parent" android:layout_marginBottom="16dp"/>
<Button
    android:text="Button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/button2" app:layout_constraintRight_toLeftOf="@+id/button"
    app:layout_constraintBottom_toTopOf="@+id/button" android:layout_marginBottom="16dp"/>
<Button
    android:text="Button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/button3"
    app:layout_constraintLeft_toRightOf="@+id/button"
    app:layout_constraintBottom_toTopOf="@+id/button" android:layout_marginBottom="16dp"/>
<RadioButton
    android:text="RadioButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" tools:layout_editor_absoluteY="376dp"
    android:id="@+id/radioButton"
    app:layout_constraintRight_toLeftOf="@+id/button"/>
<QuickContactBadge
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" app:srcCompat="@mipmap/star_empty"
    android:id="@+id/quickContactBadge" android:layout_marginEnd="16dp"
    app:layout_constraintRight_toRightOf="parent" android:layout_marginStart="16dp"
    app:layout_constraintLeft_toLeftOf="parent" android:layout_marginTop="16dp"
    app:layout_constraintTop_toTopOf="parent"/>
</android.support.constraint.ConstraintLayout>`

Answer 2

因为模拟器是Nexus_5_API_21，但您的预览显示在Nexus_4_API_25屏幕上只需将预览更改为相应的屏幕

即可

LinearLayout中的Constraintlayout在模拟器和IDE之间的不同预览？

2 个答案: