GridLayout没有显示，因为我预计

Question

对不起，我对布局不太好。我试图在一些文本字段旁边添加一个按钮，在另一个按钮旁边。当我说按钮在第3列时，在预览屏幕上向右跳跃......我做错了什么？

<GridLayout 
 
     android:id="@+id/mainGrid" 
 
     android:layout_width="0dp" 
 
     android:layout_height="0dp" 
 
     android:columnCount="3" 
 
     android:rowCount="8" 
 
     android:layout_margin="16dp" 
 
     android:layout_marginBottom="16dp" 
 
     android:layout_marginLeft="16dp" 
 
     android:layout_marginRight="16dp" 
 
     android:layout_marginStart="16dp" 
 
     android:layout_marginTop="16dp" 
 
     app:layout_constraintBottom_toBottomOf="parent" 
 
     app:layout_constraintHorizontal_bias="0.0" 
 
     app:layout_constraintLeft_toLeftOf="parent" 
 
     app:layout_constraintRight_toRightOf="parent" 
 
     app:layout_constraintTop_toTopOf="parent" 
 
     app:layout_constraintVertical_bias="0.0" 
 
     android:layout_marginEnd="16dp"> 
 

 
     <ListView 
 
      android:id="@+id/itemListView" 
 
      android:layout_width="match_parent" 
 
      android:layout_height="350dp" 
 
      android:layout_column="0" 
 
      android:layout_columnSpan="3" 
 
      android:layout_row="0" /> 
 

 
     <TextView 
 
      android:id="@+id/Instructions" 
 
      android:layout_width="wrap_content" 
 
      android:layout_height="wrap_content" 
 
      android:layout_column="0" 
 
      android:layout_columnSpan="3" 
 
      android:layout_row="1" 
 
      android:text="Enter details of item to add to you timer list below. Enter the times in seconds. The finish by refers to if you need an item to finish before the end, again in seconds." /> 
 

 
     <EditText 
 
      android:id="@+id/itemName" 
 
      android:layout_width="match_parent" 
 
      android:layout_height="wrap_content" 
 
      android:layout_column="0" 
 
      android:layout_columnSpan="2" 
 
      android:layout_row="2" 
 
      android:ems="10" 
 
      android:hint="Item to add" 
 
      android:inputType="textPersonName" /> 
 

 
     <EditText 
 
      android:id="@+id/itemTime" 
 
      android:layout_width="120dp" 
 
      android:layout_height="wrap_content" 
 
      android:layout_column="0" 
 
      android:layout_row="3" 
 
      android:ems="10" 
 
      android:hint="Time in seconds" 
 
      android:inputType="time" 
 
      android:nextFocusDown="@+id/finishTime" 
 
      android:nextFocusForward="@+id/finishTime" 
 
      android:nextFocusRight="@+id/finishTime" /> 
 

 
     <EditText 
 
      android:id="@+id/finishTime" 
 
      android:layout_width="120dp" 
 
      android:layout_height="wrap_content" 
 
      android:layout_column="0" 
 
      android:layout_row="4" 
 
      android:ems="10" 
 
      android:hint="Seconds it needs to finish by" 
 
      android:inputType="time" /> 
 

 
     <Button 
 
      android:id="@+id/addItem" 
 
      android:layout_width="wrap_content" 
 
      android:layout_height="wrap_content" 
 
      android:layout_column="1" 
 
      android:layout_margin="16dp" 
 
      android:layout_row="3" 
 
      android:layout_rowSpan="2" 
 
      android:onClick="addItem" 
 
      android:padding="16dp" 
 
      android:text="Add" /> 
 

 
     <Button 
 
      android:id="@+id/timerButton" 
 
      android:layout_width="wrap_content" 
 
      android:layout_height="wrap_content" 
 
      android:layout_column="1" 
 
      android:layout_margin="16dp" 
 
      android:layout_row="5" 
 
      android:layout_rowSpan="2" 
 
      android:text="Start Timer" /> 
 

 

 
    </GridLayout> 
 
</android.support.constraint.ConstraintLayout>

Answer 1

请检查下面的答案，我已经添加的LinearLayout和weightSum保持

像的EditText - >按钮 - >按钮 。

<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 

    <LinearLayout 
     android:id="@+id/mainGrid" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:orientation="vertical" 
     android:weightSum="5" > 

     <ListView 
      android:id="@+id/itemListView" 
      android:layout_width="match_parent" 
      android:layout_height="0dp" 
      android:layout_weight="3" 
      android:padding="5dp" /> 

     <TextView 
      android:id="@+id/Instructions" 
      android:layout_width="match_parent" 
      android:layout_height="0dp" 
      android:layout_gravity="center" 
      android:layout_weight="0.7" 
      android:gravity="start|left" 
      android:padding="5dp" 
      android:singleLine="false" 
      android:text="Enter details of item to add to you timer list below. Enter the times in seconds. The finish by refers to if you need an item to finish before the end, again in seconds." /> 

     <LinearLayout 
      android:layout_width="match_parent" 
      android:layout_height="0dp" 
      android:layout_weight="1.3" 
      android:orientation="horizontal" 
      android:weightSum="2" > 

      <LinearLayout 
       android:layout_width="0dp" 
       android:layout_height="match_parent" 
       android:layout_weight="1" 
       android:orientation="vertical" > 

       <EditText 
        android:id="@+id/itemName" 
        android:layout_width="wrap_content" 
        android:layout_height="0dp" 
        android:layout_weight="1" 
        android:ems="10" 
        android:hint="Item to add" 
        android:inputType="textPersonName" /> 

       <EditText 
        android:id="@+id/itemTime" 
        android:layout_width="wrap_content" 
        android:layout_height="0dp" 
        android:layout_weight="1" 
        android:ems="10" 
        android:hint="Time in seconds" 
        android:inputType="time" 
        android:nextFocusDown="@+id/finishTime" 
        android:nextFocusForward="@+id/finishTime" 
        android:nextFocusRight="@+id/finishTime" /> 

       <EditText 
        android:id="@+id/finishTime" 
        android:layout_width="wrap_content" 
        android:layout_height="0dp" 
        android:layout_weight="1" 
        android:ems="10" 
        android:hint="Seconds it needs to finish by" 
        android:inputType="time" /> 
      </LinearLayout > 

      <LinearLayout 
       android:layout_width="0dp" 
       android:layout_height="match_parent" 
       android:layout_gravity="center" 
       android:layout_weight="1" 
       android:orientation="horizontal" > 

       <Button 
        android:id="@+id/addItem" 
        android:layout_width="0dp" 
        android:layout_height="wrap_content" 
        android:layout_gravity="center" 
        android:layout_margin="16dp" 
        android:layout_weight="1" 
        android:gravity="center" 
        android:onClick="addItem" 
        android:padding="16dp" 
        android:text="Add" /> 

       <Button 
        android:id="@+id/timerButton" 
        android:layout_width="0dp" 
        android:layout_height="wrap_content" 
        android:layout_gravity="center" 
        android:layout_margin="16dp" 
        android:layout_weight="1" 
        android:gravity="center" 
        android:text="Start Timer" /> 
      </LinearLayout > 
     </LinearLayout > 
    </LinearLayout > 
</LinearLayout >