如何在Android中禁用/启用LinearLayout上的所有子项

Question

Is there way by programming that all the children of a certain layout?

For example i have this layout with two children:

<LinearLayout android:layout_height="wrap_content"
        android:id="@+id/linearLayout1" android:layout_width="fill_parent">
        <SeekBar android:layout_height="wrap_content" android:id="@+id/seekBar1"
            android:layout_weight="1" android:layout_width="fill_parent"></SeekBar>
        <TextView android:id="@+id/textView2" android:text="TextView"
            android:layout_width="wrap_content" android:textAppearance="?android:attr/textAppearanceLarge"
            android:layout_height="wrap_content"></TextView>
    </LinearLayout>

and i want to do something like:

LinearLayout myLayout = (LinearLayout) findViewById(R.id.linearLayout1);
myLayout.setEnabled(false);

In order to disable the two textviews.

Any idea how?

Answer 1

A LinearLayout extends ViewGroup, so you can use the getChildCount() and getChildAt(index) methods to iterate through your LinearLayout children and do whatever you want with them. I'm not sure what you mean by enable/disable, but if you're just trying to hide them, you can do setVisibility(View.GONE);

So, it would look something like this:

LinearLayout myLayout = (LinearLayout) findViewById(R.id.linearLayout1);
for ( int i = 0; i < myLayout.getChildCount();  i++ ){
    View view = myLayout.getChildAt(i);
    view.setVisibility(View.GONE); // Or whatever you want to do with the view.
}

Answer 2

You can also disable/enable without using setVisibility()

Add a View.OnClickListener to your CheckBox then pass the View you want to be disabled into the following function...

private void enableDisableView(View view, boolean enabled) {
    view.setEnabled(enabled);

    if ( view instanceof ViewGroup ) {
        ViewGroup group = (ViewGroup)view;

        for ( int idx = 0 ; idx < group.getChildCount() ; idx++ ) {
            enableDisableView(group.getChildAt(idx), enabled);
        }
    }
}

with the following reference Is there a way to disable all the items in a specific layout programmaticaly?

Answer 3

为什么不在布局本身上执行setVisibility（View.GONE），而不是遍历子节点？

Answer 4

Maybe is late, but you can just add android:duplicateParentState="true" in the child of the LinearLayout

Something like this:

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

     <TextView
         android:id="@+id/textA"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:duplicateParentState="true"
         android:text="First Text"/>

     <TextView
         android:id="@+id/textB"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:duplicateParentState="true"
         android:text="Second Text"/>

 </LinearLayout>

Answer 5

只需添加另一个透明布局，该布局将匹配原始视图的match_parent，并在您要禁用所有子项时将其可见性更改为可见，并启用子项，然后将可见性更改为已消失