小编Gro*_*oot的帖子

如何在GridLayout中垂直滚动？我已经尝试使用ScrollView将GridLayout作为子项,在GridLayout中使用RelativeLayout子项,但这会导致所有子项堆叠在一起并且或者超出布局.

在ScrollView中使用GridLayout之前:

在ScrollView中的GridLayout之后:

我需要使用ScrollView中的GridLayout作为Child实现该效果

我的XML布局文件:

<ScrollView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:fillViewport="true">

    <LinearLayout
        android:id="@+id/boxContainer"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

        <GridLayout
            android:layout_width="wrap_content"
            android:layout_height="315dp">

            <!-- RelativeLayout children go here -->

        </GridLayout>

    </LinearLayout>

</ScrollView>

我使用LayoutParams在OnCreate中初始化它们:

//MiddleLayout
        GridLayout.LayoutParams middleLayoutLayoutParams = (GridLayout.LayoutParams)middleLayout.getLayoutParams();
        middleLayoutLayoutParams.setMargins(2, 273, 400, 0);
        middleLayoutLayoutParams.setGravity(Gravity.LEFT);
        middleLayoutLayoutParams.width = 424;
        middleLayout.setLayoutParams(middleLayoutLayoutParams);
        middleLayout.setBackgroundDrawable(new ColorDrawable(Color.RED));
        middleLayout.bringToFront();

        //MiddleLayout1
        GridLayout.LayoutParams middleLayoutLayoutParams1 = (GridLayout.LayoutParams)middleLayout1.getLayoutParams();
        middleLayoutLayoutParams1.setMargins(431, 273, -2, 0);
        middleLayout1.getLayoutParams().width = 645;
        middleLayout1.setLayoutParams(middleLayoutLayoutParams1);
        middleLayout1.setBackgroundDrawable(new ColorDrawable(Color.GREEN));

        //TopLayout
        GridLayout.LayoutParams topLayoutLayoutParams = (GridLayout.LayoutParams)topLayout.getLayoutParams();
        topLayoutLayoutParams.setMargins(2, 0, -2, 676);
        topLayout.getLayoutParams().width = 631;
        topLayout.setLayoutParams(topLayoutLayoutParams);
        topLayout.setBackgroundDrawable(new ColorDrawable(Color.rgb(255, 154, 0)));

        //TopLayout1
        GridLayout.LayoutParams topLayoutLayoutParams1 = …

我正在获取一个NullPointerException blah.startAnimation(anim),它位于一个LongClickListener.我想要做的是在DragListener上获取GridLayout中的子项数,并在开始拖动imageview时为所有子项设置动画.由于某种原因,这会返回NullPointerException,

它的来源是:

@Override
public boolean onLongClick(View v) {
     View.DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(v);
     v.startDrag(null, shadowBuilder, v, 0);

     deleteAreaForAdapter.setVisibility(View.VISIBLE);
     deleteAreaForAdapter.startAnimation(slide_in);
     for(int i=0; i<middleViewForAdapter.getChildCount(); i++) {
         int middleChildCount = middleViewForAdapter.getChildCount();
         int middleChildCount1 = middleViewForAdapter.getChildCount();
         int topChildCount = middleViewForAdapter.getChildCount();
         int topChildCount1 = middleViewForAdapter.getChildCount();
         int bottomChildCount = middleViewForAdapter.getChildCount();

         LinearLayout topChild = (LinearLayout)topViewForAdapter.getChildAt(i);
         LinearLayout topChild1 = (LinearLayout)topViewForAdapter1.getChildAt(i);
         LinearLayout bottomChild = (LinearLayout)bottomViewForAdapter.getChildAt(i);

         Context context = mContext;

         Animation shakeAnim = AnimationUtils.loadAnimation(context, R.anim.shake);

         // do stuff with child view
         //ll.clearAnimation();
         /*middleChild1.startAnimation(shakeAnim);
         topChild.startAnimation(shakeAnim);
         topChild1.startAnimation(shakeAnim);
         bottomChild.startAnimation(shakeAnim);*/ …

我怎样才能得到GridLayout的所有孩子？在我的GridLayout中,我正在添加视图blahblah.addView(child),而不是通过XML.GridLayout有点像这样:

+++++++++ ++++++++++ ++++++++++ |ImageView| |ImageView| |ImageView| | | | | | | ++++++++++ ++++++++++ ++++++++++ [TextView] [Textview] [TextView]

我需要一个按钮来在GridLayout中的所有imageViews上播放动画.别担心,我已经把它覆盖了.所以我需要对child.startAnimation(anim)GridLayout的所有子项做.我怎么能以编程方式执行此操作？

谢谢