ListView Viewholder的坑线性布局的坑

1。ListView Viewholder的坑

    /**

     * 默认带图片的menu adapter

     */

    public static class MenuImageAdapter extends BaseAdapter {

        private List<Aliquot> mDataSet;

        private Context mContext;

        public MenuImageAdapter(List<Aliquot> dataSet, Context context) {

            this.mDataSet = dataSet;

            this.mContext = context;

        }

        @Override

        public int getCount() {

            return mDataSet == null ? 0 : mDataSet.size();

        }

        @Override

        public Object getItem(int position) {

            return mDataSet.get(position);

        }

        @Override

        public long getItemId(int position) {

            return position;

        }

        @Override

        public View getView(int position, View convertView, ViewGroup parent) {

            MenuImageHolder holder = null;

            Aliquot aliquot = mDataSet.get(position);

            if (convertView == null) {

                holder = new MenuImageHolder();

                convertView = LayoutInflater.from(mContext).inflate(DEF_TEXT_IMAGE_ITEM_RES, null);

                holder.mImageViewLeft = (ImageView) convertView.findViewById(R.id.img_menu_dialog_left);

                holder.mImageViewRight = (ImageView) convertView.findViewById(R.id.img_menu_dialog_right);

                holder.mParentRl = (RelativeLayout) convertView.findViewById(R.id.dialog_menu_parent_rl);

                holder.mTextView = (TextView) convertView.findViewById(R.id.tv_menu_dialog);

                holder.mVline = (View) convertView.findViewById(R.id.shelf_dilog_item_v_line);

                convertView.setTag(holder);

            } else {

                holder = (MenuImageHolder) convertView.getTag();

            }

            if (aliquot.mSrcLeftDrawableId != 0) {

                holder.mImageViewLeft.setImageResource(aliquot.mSrcLeftDrawableId);

                holder.mImageViewLeft.setVisibility(View.VISIBLE);

                LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) holder.mParentRl.getLayoutParams();

                params.setMargins(15,0,0,0);

            }else{

                holder.mImageViewLeft.setVisibility(View.GONE);

            }

            if (aliquot.mSrcRightDrawableId != 0) {

                holder.mImageViewRight.setImageResource(aliquot.mSrcRightDrawableId);

                holder.mImageViewRight.setVisibility(View.VISIBLE);

            }else{

                holder.mImageViewRight.setVisibility(View.GONE);

            }

//            if(position == mDataSet.size()-1){

//                holder.mVline.setVisibility(View.INVISIBLE);

//            }else{

//                holder.mVline.setVisibility(View.VISIBLE);

//            }

            holder.mTextView.setText(aliquot.mContent);

            return convertView;

        }

    }

    public static class MenuImageHolder {

        private TextView mTextView;//文字

        private ImageView mImageViewLeft;//图片在左侧

        private ImageView mImageViewRight;//图片在右侧

        private RelativeLayout mParentRl;

        private View mVline;//分割线

    }

其中：

if (aliquot.mSrcLeftDrawableId != 0) {

                holder.mImageViewLeft.setImageResource(aliquot.mSrcLeftDrawableId);

                holder.mImageViewLeft.setVisibility(View.VISIBLE);

                LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) holder.mParentRl.getLayoutParams();

                params.setMargins(15,0,0,0);

            }else{

                holder.mImageViewLeft.setVisibility(View.GONE);

            }

如果这里没有else的话，就会导致你的holder.mImageViewLeft 显示出来。因为你holder重用了嘛，用了holder之后，记得改状态。

2。线性布局的坑

水平线性布局如果被其中一个元素布满了（match_paraent），那么你写的后面的元素都不会显示出来了。

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="@dimen/dialog_menutype_item_height"

    android:gravity="center_vertical"

    android:paddingLeft="@dimen/dialog_padding_left"

    android:orientation="horizontal">

    <ImageView

        android:id="@+id/img_menu_dialog_left"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

         />

    <RelativeLayout

        android:id="@+id/dialog_menu_parent_rl"

        android:layout_width="match_parent"

        android:layout_height="@dimen/dialog_menutype_item_height"

        android:layout_marginLeft="15dp"

        >

        <TextView

            android:id="@+id/tv_menu_dialog"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_centerVertical="true"

            android:textSize="15sp"

            android:textColor="@color/primary_color_1"

             />

        <View

            android:id="@+id/shelf_dilog_item_v_line"

            android:layout_width="match_parent"

            android:layout_height="2px"

            android:visibility="gone"

            android:layout_alignParentBottom="true"

            android:background="@color/zz_black_10_percent_transparent"

            ></View>

    </RelativeLayout>

    <ImageView

        android:id="@+id/img_menu_dialog_right"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        />

</LinearLayout>

这个布局中id 为img_menu_dialog_right的元素永远也显示不出来。坑死我了，我开始没有意识到这个简单的问题。

巴特西

ListView Viewholder的坑线性布局的坑

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ListView Viewholder的坑线性布局的坑