Question

我有一个自定义ListView，其中有一个textview和一个图像。我在customlistadapter类中为imageview设置了onclicklistener，因此我需要在单击图像时对主布局进行一些更改。请参阅以下代码以供参考......

MainActivity.java

hmDataList.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long arg1) {

            DataFields dataField = (DataFields) hmDataList
                    .getItemAtPosition(position);
            ImageView v = (ImageView) view.findViewById(R.id.hmFieldDeleteImage);
            RelativeLayout mainRL = (RelativeLayout)view.findViewById(R.id.hmFieldMainRL);
            }

}

CustomListAdapter.java

    public View getView(int position, View convertView, ViewGroup parent) {
        holder = null;
        DataFields rowItems = (DataFields) getItem(position);
        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Activity.LAYOUT_INFLATER_SERVICE);

        if (convertView == null) {
            convertView = inflater.inflate(R.layout.home_field_row, null);
            holder = new ViewHolder();
            holder.mName = (TextView) convertView.findViewById(R.id.hmFieldName);
            holder.mDeleteImage = (ImageView)convertView.findViewById(R.id.hmFieldDeleteImage);

            convertView.setTag(holder);

            holder.mDeleteImage.setTag(position);
            final View clickView = convertView;
            holder.mDeleteImage.setOnClickListener(new ImageView.OnClickListener() {

                @Override
                public void onClick(final View view) {
                    count++;
                    clickView.setBackgroundColor(color.list_row_bg);
                    //
                    //Some changes has to be made for the main activity's layout
                    //
                }
            });
        }

        else {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.mName.setText(rowItems.getName());

        return convertView;
    }

list_row.xml

<TextView
    android:id="@+id/hmFieldName"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_centerVertical="true"
    android:layout_marginBottom="10dp"
    android:layout_marginLeft="10dp"
    android:layout_marginTop="10dp"
    android:gravity="left"
    android:shadowColor="#000000"
    android:shadowDx="0"
    android:shadowDy="0"
    android:shadowRadius="2"
    android:text="@string/no_data"
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:textColor="#F2F2F2" />

<ImageView
    android:id="@+id/hmFieldDeleteImage"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:layout_centerVertical="true"
    android:layout_marginBottom="10dp"
    android:layout_marginRight="10dp"
    android:layout_marginTop="10dp"
    android:contentDescription="@string/right_arrow"
    android:src="@drawable/delete" />

activity_main.xml 有一些隐藏的小部件，因此我需要在单击自定义ListView中的图像时取消隐藏它们。

简单来说，有没有办法从其他类更新主要活动的gui？任何形式的帮助或示例或参考都非常感谢。谢谢！

Answer 1

这是一个很好的方法：

在 MainActivity.java 中添加：

public onClickListener mListener = new OnClickListener(){
        @Override
            public void onClick(final View view) {
                count++;
                view.setBackgroundColor(color.list_row_bg);
                //
                //Some changes has to be made for the main activity's layout
                //

               // Here you can delete add or do anything to your views
            }

  };

并在创建新的CustomListAdapter对象时：

CustomListAdapter adapter = new .....;
adapter.setActivity(this);

并在 CustomListAdapter.java 中添加：

 private MainActivity mActivity;


 public void setActivity(MainActivity activity){
          mActivity = activity;
 }

并在你的getView方法中：

public View getView（int position，View convertView，ViewGroup parent）{ holder = null; DataFields rowItems =（DataFields）getItem（position）; LayoutInflater inflater =（LayoutInflater）context .getSystemService（Activity.LAYOUT_INFLATER_SERVICE）;

    if (convertView == null) {
        convertView = inflater.inflate(R.layout.home_field_row, null);

             ....  Same Code

        holder.mDeleteImage.setTag(position);
        final View clickView = convertView;
// use this code
        holder.mDeleteImage.setOnClickListener(mActivity.mListener);
    }

    else {
        holder = (ViewHolder) convertView.getTag();
    }

}

Answer 2

在定义图像/按钮是先隐藏还是不隐藏之前，在另一个活动上

。

on on OnClick put setContentView(yourmainActivity)然后定义了您看不见的ImageView。然后做你的方法让可见的回来。 P.S将代码放在startActivity之后。希望对你有所帮助。

另一个类的访问布局？

2 个答案: