Android处理ListView中的许多EditText字段

Question

只是一个基本问题:如果我有几十个属于ListAdapter的EditText字段,那么各个EditText字段如何知道它们属于哪一行？

目前我正在使用TextWatcher来监听文本输入.我已经尝试扩展TextWatcher,以便我可以将EditText的位置传递给TextWatcher的构造函数.

但是,当弹出软键盘时,与各种EditText字段对应的位置会随机播放.

如何跟踪EditText字段到正确的位置？

我正在使用GridView来解决问题.每个项目的布局都是一个ImageView,其下方有TextView和EditText字段.

每个EditText的文本都保存在一个名为strings的全局String数组中.它最初是空的,并由我的TextWatcher类更新.

public void initList()
    {
        ArrayAdapter<String> listAdapter = new ArrayAdapter<String>(this, R.layout.shape, strings)
        {
            @Override
            public View getView(final int position, View convertView, ViewGroup parent)  {
                if (convertView == null)  {
                    convertView = LayoutInflater.from(getContext()).inflate(R.layout.shape, null);
                }
                final String theData = getItem(position);
                final EditText editText = (EditText) convertView.findViewById(R.id.shape_edittext);
                editText.setText(theData);
                editText.addTextChangedListener(
                        new MyTextWatcher(position, editText)
                );

                ImageView image = (ImageView) convertView.findViewById(R.id.shape_image);
                image.setBackgroundResource(images[position]);

                TextView text = (TextView) convertView.findViewById(R.id.shape_text);
                if (gameType == SHAPES_ABSTRACT)
                    text.setText("Seq:");
                else
                    text.setVisibility(View.GONE);  

                return convertView;
            }

            @Override
            public String getItem(int position) {        return strings[position];       }
        };

        grid.setAdapter(listAdapter);
    }


private class MyTextWatcher implements TextWatcher {
    private int index;
    private EditText edittext;
    public MyTextWatcher(int index, EditText edittext) { 
               this.index = index; 
               this.edittext = edittext;    
        }
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
    public void onTextChanged(CharSequence s, int start, int before, int count) {}
    public void afterTextChanged(Editable s) {  strings[index] = s.toString();      }
    public void setIndex(int newindex) {  index = newindex;    }
}

当我点击第一个EditText(见图片)时,EditText转移到笑脸下的那个.

Answer 1

如果这是一个很好的用户界面设计,请不要考虑以下内容:

public class TestList
{
    public void blah()
    {
        ArrayAdapter<DataBucket> listAdapter = new ArrayAdapter<DataBucket>()
        {

            @Override
            public View getView(int position, View convertView, ViewGroup parent)
            {
                if (convertView == null)
                {
                    convertView = LayoutInflater.from(getContext()).inflate(R.layout.testlayout, null);
                }

                final DataBucket dataBucket = getItem(position);
                final EditText editText = (EditText) convertView.findViewById(R.id.theText);
                editText.setText(dataBucket.getSomeData());
                editText.addTextChangedListener(new TextWatcher()
                {
                    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2)
                    {

                    }

                    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2)
                    {

                    }

                    public void afterTextChanged(Editable editable)
                    {
                        dataBucket.setSomeData(editable.toString());
                    }
                });

                return convertView;
            }
        };
    }

    public static class DataBucket
    {
        private String someData;

        public String getSomeData()
        {
            return someData;
        }

        public void setSomeData(String someData)
        {
            this.someData = someData;
        }
    }
}

'DataBucket'是一个占位符.您需要使用您创建的任何类来存储在编辑文本中放入和编辑的数据.TextWatcher将引用引用的数据对象.滚动时,编辑文本框应使用当前数据更新,并应保存文本更改.您可能希望跟踪用户更改了哪些对象,以使数据/网络更新更有效.

*编辑*

要使用int位置而不是直接引用对象:

ArrayAdapter<DataBucket> listAdapter = new ArrayAdapter<DataBucket>()
{

    @Override
    public View getView(final int position, View convertView, ViewGroup parent)
    {
        if (convertView == null)
        {
            convertView = LayoutInflater.from(getContext()).inflate(R.layout.testlayout, null);
        }

        final DataBucket dataBucket = getItem(position);
        final EditText editText = (EditText) convertView.findViewById(R.id.theText);
        editText.setText(dataBucket.getSomeData());
        editText.addTextChangedListener(new TextWatcher()
        {
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2)
            {

            }

            public void onTextChanged(CharSequence charSequence, int i, int i1, int i2)
            {

            }

            public void afterTextChanged(Editable editable)
            {
                getItem(position).setSomeData(editable.toString());
            }
        });

        return convertView;
    }
};

*再次编辑*

我觉得有必要为后代说,我实际上不会这样编码.我猜你想要一个比String数组更结构化的数据,并且你在外面维护String数组,以及一个ArrayAdapter,所以它是一种奇怪的并行情况.但是,这样可以正常工作.

我将数据放在单个String数组中而不是多维数组中.原因是支持GridView的数据模型只是一个简单的列表.这可能违反直觉,但事实就是如此.GridView应该自行进行布局,如果留给自己的设备,将使用可变数量的单元格填充行,具体取决于您拥有的数据量和屏幕的宽度(AFAIK).

够聊天了.代码:

public class TestList extends Activity
{
    private String[] guess;

    //Other methods in here, onCreate, etc

    //Call me from somewhere else. Probably onCreate.
    public void initList()
    {
        ArrayAdapter<String> listAdapter = new ArrayAdapter<String>(this, /*some resourse id*/, guess)
        {

            @Override
            public View getView(final int position, View convertView, ViewGroup parent)
            {
                if (convertView == null)
                {
                    convertView = LayoutInflater.from(getContext()).inflate(R.layout.testlayout, null);
                }

                final String theData = getItem(position);
                final EditText editText = (EditText) convertView.findViewById(R.id.theText);
                editText.setText(theData);
                editText.addTextChangedListener(
                        new MyTextWatcher(position)
                );

                return convertView;
            }
        };

        gridView.setAdapter(listAdapter);
    }

    class MyTextWatcher extends TextWatcher {
         private int position;

         public MyTextWatcher(int position) {
                 this.position = position;
         }

         public void afterTextChanged(Editable s) {
                 guess[position] = s.toString();
         }

     // other methods are created, but empty
    }
}