自定义ListView展开后不会崩溃

我有一个自定义的listView，它显示一个Image和一些文本，以及3个仅在轻按一个项目时才出现的按钮。它们出现在短暂的下拉动画之后。

单击列表中的某个项目后，将显示按钮，但是单击同一项目时，这些按钮不会缩回视图，它们保持活动状态并且可以单击，但是当我单击其他项目时，该行会展开并显示按钮，但是它们在再次单击后也不会折叠。

附带一提，我也想知道一旦列表上的另一个项目展开后如何自动折叠其他项目

这是listView的一行

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="2dp">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
    <ImageView
        android:id="@+id/icon"
        android:layout_width="80dp"
        android:layout_height="50dp"
        android:layout_alignParentTop="true"
        android:layout_gravity="center_horizontal"
        android:scaleType="fitCenter"
        android:src="@drawable/placeholder" />

    <TextView
        android:id="@+id/label"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_margin="8dp"
        android:maxLines="3" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="50dip"
        android:orientation="horizontal"
        android:id="@+id/listview_toolbar"
        android:layout_marginBottom="-50dip"
        android:visibility="gone"
        android:weightSum="90">
        <Button
            android:layout_width="fill_parent"
            android:layout_height="50dip"
            android:text="@string/view"
            android:focusableInTouchMode="false"
            android:id="@+id/view"
            android:layout_weight="30" />

        <Button
            android:layout_width="fill_parent"
            android:layout_height="50dip"
            android:text="@string/edit"
            android:id="@+id/edit"
            android:focusableInTouchMode="false"
            android:layout_weight="30" />

        <Button
            android:layout_width="fill_parent"
            android:layout_height="50dip"
            android:focusableInTouchMode="false"
            android:text="@string/remove"
            android:id="@+id/remove"
            android:layout_weight="30" />

    </LinearLayout>


</LinearLayout>

这是我的自定义适配器

public class MyAdapter extends ArrayAdapter<String> {
        private final Activity context;
        private final ArrayList<String> names;

        class ViewHolder {
            public TextView text;
            public ImageView image;
            public View toolbar;
        }

        public MyAdapter(Activity context, ArrayList<String> names) {
            super(context, R.layout.ui_row, names);
            this.context = context;
            this.names = names;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            // reuse views
            if (convertView == null) {
                convertView = getLayoutInflater().inflate(R.layout.ui_row, null);
                // configure view holder
                ViewHolder viewHolder = new ViewHolder();
                viewHolder.text = (TextView) convertView.findViewById(R.id.label);
                viewHolder.image = (ImageView) convertView.findViewById(R.id.icon);
                viewHolder.toolbar = convertView.findViewById(R.id.listview_toolbar);
                convertView.setTag(viewHolder);
            }
            // fill data
            ViewHolder holder = (ViewHolder) convertView.getTag();
            holder.text.setText(filelist.get(position));//sets textview of item row in listview
            PicassoTools.clearCache(Picasso.with(context));//resets picasso, erases caches
            Picasso.with(context).load(new File( Environment.getExternalStorageDirectory() + "//Thumbnails//" + position)).into(holder.image);
            ((LinearLayout.LayoutParams) holder.toolbar.getLayoutParams()).bottomMargin = -50;
            holder.toolbar.setVisibility(View.GONE);
            return convertView;
        }


    }

这是onCreate

    protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.mainactivity);

            ac = this;
            adapter = new MyAdapter(ac, filelist);



            listview = (ListView) findViewById(R.id.listview);


                    listview.setAdapter(adapter);
                    ListViewSetClickListener();

listview.setOnItemClickListener(new AdapterView.OnItemClickListener()
        {
            public void onItemClick(AdapterView<?> parent, final View view, int position, long id)
            {

                Toast.makeText(getApplicationContext(), "Button Tap", Toast.LENGTH_SHORT).show();

                View toolbar = view.findViewById(R.id.listview_toolbar);
                Expand_Custom_Animation expandAni = new Expand_Custom_Animation(toolbar, 500);
                toolbar.startAnimation(expandAni);

                Button viewB = (Button) view.findViewById(R.id.view);
                viewB.setOnClickListener(new View.OnClickListener()
                {
                    @Override
                    public void onClick(View v)
                    {
                        Toast.makeText(getApplicationContext(), "View", Toast.LENGTH_SHORT).show();
                    }
                });

                Button edit = (Button) view.findViewById(R.id.edit);
                edit.setOnClickListener(new View.OnClickListener()
                {
                    @Override
                    public void onClick(View v)
                    {
                        Toast.makeText(getApplicationContext(), "Edit", Toast.LENGTH_SHORT).show();
                    }
                });

                Button remove = (Button) view.findViewById(R.id.remove);
                remove.setOnClickListener(new View.OnClickListener()
                {
                    @Override
                    public void onClick(View v)
                    {
                        Toast.makeText(getApplicationContext(), "Remove", Toast.LENGTH_SHORT).show();
                    }
                });


            }
        });



        }

这是动画类Expand_Custom_Animation.java

public class Expand_Custom_Animation extends Animation 
{
    private View mAnimatedView;
    private LayoutParams mViewLayoutParams;
    private int mMarginStart, mMarginEnd;
    private boolean mIsVisibleAfter = false;
    private boolean mWasEndedAlready = false;

    public Expand_Custom_Animation(View view, int duration) 
    {
        setDuration(duration);
        mAnimatedView = view;
        mViewLayoutParams = (LayoutParams) view.getLayoutParams();
        mIsVisibleAfter = (view.getVisibility() == View.VISIBLE);
        mMarginStart = mViewLayoutParams.bottomMargin;
        mMarginEnd = (mMarginStart == 0 ? (0 - view.getHeight()) : 0);
        view.setVisibility(View.VISIBLE);
    }

    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) 
    {
        super.applyTransformation(interpolatedTime, t);

        if (interpolatedTime < 1.0f) 
        {
            mViewLayoutParams.bottomMargin = mMarginStart + (int) ((mMarginEnd - mMarginStart) * interpolatedTime);
            mAnimatedView.requestLayout();
        } 
        else if (!mWasEndedAlready)
        {
            mViewLayoutParams.bottomMargin = mMarginEnd;
            mAnimatedView.requestLayout();

            if (mIsVisibleAfter) 
            {
                mAnimatedView.setVisibility(View.GONE);
            }
            mWasEndedAlready = true;
        }
    }
}