Android布局高度没有按钮点击更新

Question

在布局中，我有一个按钮可以切换视图的可见性（隐藏/显示线性布局）。在这个布局里面我也有一个微调。当我点击按钮时，它会切换可见性，但它不会将布局高度更改为wrap_content，但是当我更改微调器值时，它会更新高度。

这是XML布局代码

<LinearLayout 
    android:id="@+id/layoutA1" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_below="@+id/tvAlarmHeading" 
    android:layout_margin="5dip" 
    android:layout_marginBottom="5dp" 
    android:layout_marginTop="5dp" 
    android:background="@drawable/transparent_border" 
    android:orientation="vertical" > 

    <LinearLayout 
     android:id="@+id/layoutA1C1" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:gravity="center" 
     android:orientation="vertical" > 

     <LinearLayout 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_marginBottom="5dp" 
      android:gravity="center" 
      android:orientation="horizontal" > 

      <Spinner 
       android:id="@+id/spnParameterA1C1" 
       android:layout_width="140dp" 
       android:layout_height="wrap_content" 
       android:textSize="20sp" /> 



     </LinearLayout> 

     <LinearLayout 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_marginBottom="5dp" 
      android:gravity="center" 
      android:orientation="horizontal" > 

      <Button 
       android:id="@+id/btnAddA1C1" 
       android:layout_width="40dp" 
       android:layout_height="40dp" 
       android:layout_alignParentBottom="true" 
       android:layout_centerHorizontal="true" 
       android:layout_gravity="center" 
       android:background="@drawable/button_pattern" 
       android:text="+" 
       android:textSize="22sp" /> 

     </LinearLayout> 

    </LinearLayout> 

    <LinearLayout 
     android:id="@+id/layoutA1C2" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:gravity="center" 
     android:orientation="vertical" > 

     <LinearLayout 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_marginBottom="5dp" 
      android:gravity="center" 
      android:orientation="horizontal" > 

      <Spinner 
       android:id="@+id/spnConditionA1" 
       android:layout_width="70dp" 
       android:layout_height="wrap_content" 
       android:textSize="18sp" /> 

     </LinearLayout> 

     <LinearLayout 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_marginBottom="5dp" 
      android:gravity="center" 
      android:orientation="horizontal" > 

      <Button 
       android:id="@+id/btnRemoveA1C2" 
       android:layout_width="40dp" 
       android:layout_height="40dp" 
       android:layout_alignParentBottom="true" 
       android:layout_centerHorizontal="true" 
       android:layout_gravity="center" 
       android:background="@drawable/button_pattern" 
       android:text="-" 
       android:textSize="22sp" /> 

     </LinearLayout> 

    </LinearLayout> 

</LinearLayout> 

下面是活动代码，我切换视图知名度

//Set the on item selected listener on the parameter spinner for alarm1 condition 1 
spnParameterA1C1.setOnItemSelectedListener(new OnItemSelectedListener() 
{ 
    @Override 
    public void onItemSelected(AdapterView<?> parent, View view,int position, long id) 
    { 
     tvUnitA1C1.setText(unitList.get(position)); 
    } 
    @Override 
    public void onNothingSelected(AdapterView<?> parent){} 

}); 

//Set onClickListener for add condition button for Alarm 1 
btnAddA1C1.setOnClickListener(new View.OnClickListener() 
{ 
    public void onClick(View v) 
    { 
     layoutA1C2.getLayoutParams().height = LayoutParams.WRAP_CONTENT; 
     layoutA1C2.setVisibility(android.view.View.VISIBLE); 
     btnAddA1C1.setVisibility(android.view.View.INVISIBLE); 
     layoutA1.getLayoutParams().height = LayoutParams.WRAP_CONTENT; 
    } 
}); 

//Set onClickListener for add condition button for Alarm 1 
btnRemoveA1C2.setOnClickListener(new View.OnClickListener() 
{ 
    public void onClick(View v) 
    { 
     layoutA1C2.getLayoutParams().height = 0; 
     btnAddA1C1.setVisibility(android.view.View.VISIBLE); 
     layoutA1C2.setVisibility(android.view.View.INVISIBLE); 
     layoutA1.getLayoutParams().height = LayoutParams.WRAP_CONTENT; 
    } 
}); 

我也曾尝试layoutA1.refreshDrawableState();。任何人都可以告诉我应该调用哪种方法来刷新布局长度？

Answer 1

您需要再次设置布局参数才能刷新视图。

尝试：

LayoutParams params = layoutA1C2.getLayoutParams(); 
params.height = LayoutParams.WRAP_CONTENT; 
layoutA1C2.setLayoutParams(params); // this call is what you need to add