GridLayout沒有顯示，因爲我預計

Question

對不起，我對佈局不太好。我試圖在一些文本字段旁邊添加一個按鈕，在另一個按鈕旁邊。當我說按鈕在第3列時，在預覽屏幕上向右跳躍......我做錯了什麼？

<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

請檢查下面的答案，我已經添加的LinearLayout和weightSum保持

像的EditText - >按鈕 - >按鈕 。

<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 >