如何在edittext中获取列表选定项目？

Posted 2023-05-07

【中文标题】如何在edittext中获取列表选定项目？

【英文标题】：How to get list selected item in edittext?

【发布时间】：2015-01-23 00:15:19

【问题描述】：

我是android新手，我在右侧有一个带有imageicon的edittext，单击该图标后，下一个活动将打开，我正在使用带有复选框的listview，所以问题是我想在上一页上获取listview的所有选定项目编辑文本，任何机构都可以帮忙吗？谢谢

MyCustomAdapter dataAdapter = null;

@Override
public void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.list_view_religionlist);

    // Generate list View from ArrayList
    displayListView();

    checkButtonClick();



private void displayListView() 

    // Array list of countries
    ArrayList<MotherTongues> stateList = new ArrayList<MotherTongues>();

    MotherTongues _states = new MotherTongues("Sikh", false);
    stateList.add(_states);
    _states = new MotherTongues("Parsi", true);
    stateList.add(_states);
    _states = new MotherTongues("Brahmin", false);
    stateList.add(_states);
    _states = new MotherTongues("Patel", true);
    stateList.add(_states);
    _states = new MotherTongues("Baniya", true);
    stateList.add(_states);
    _states = new MotherTongues("Rajput", false);
    stateList.add(_states);
    _states = new MotherTongues("Christian", false);
    stateList.add(_states);
    _states = new MotherTongues("Darji", false);
    stateList.add(_states);
    _states = new MotherTongues("Muslim", false);
    stateList.add(_states);

    // create an ArrayAdaptar from the String Array
    dataAdapter = new MyCustomAdapter(this, R.layout.list_item_religionlist, stateList);
    ListView listView = (ListView) findViewById(R.id.listView1);
    // Assign adapter to ListView
    listView.setAdapter(dataAdapter);

    listView.setOnItemClickListener(new OnItemClickListener() 

        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) 
            // When clicked, show a toast with the TextView text
            MotherTongues state = (MotherTongues) parent.getItemAtPosition(position);
            Toast.makeText(getApplicationContext(),
                    "Clicked on : " + state.getName(), Toast.LENGTH_LONG)
                    .show();
        
    );


private class MyCustomAdapter extends ArrayAdapter<MotherTongues> 

    private ArrayList<MotherTongues> stateList;

    public MyCustomAdapter(Context context, int textViewResourceId,

    ArrayList<MotherTongues> stateList) 
        super(context, textViewResourceId, stateList);
        this.stateList = new ArrayList<MotherTongues>();
        this.stateList.addAll(stateList);
    

    private class ViewHolder 
        TextView code;
        CheckBox name;
    

    @Override
    public View getView(int position, View convertView, ViewGroup parent) 

        ViewHolder holder = null;

        Log.v("ConvertView", String.valueOf(position));

        if (convertView == null) 

            LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            convertView = vi.inflate(R.layout.list_item_mothertongue, null);

            holder = new ViewHolder();
            holder.code = (TextView) convertView.findViewById(R.id.code);
            holder.name = (CheckBox) convertView
                    .findViewById(R.id.checkBox1);

            convertView.setTag(holder);

            holder.name.setOnClickListener(new View.OnClickListener() 
                public void onClick(View v) 
                    CheckBox cb = (CheckBox) v;
                    MotherTongues _state = (MotherTongues) cb.getTag();

                    Toast.makeText(
                            getApplicationContext(),
                            "Checkbox: " + cb.getText() + " -> "
                                    + cb.isChecked(), Toast.LENGTH_LONG)
                            .show();

                    _state.setSelected(cb.isChecked());
                
            );

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

        MotherTongues state = stateList.get(position);

        //holder.code.setText(" (" + state.getCode() + ")");
        holder.name.setText(state.getName());
        holder.name.setChecked(state.isSelected());

        holder.name.setTag(state);

        return convertView;
    



private void checkButtonClick() 

    Button myButton = (Button) findViewById(R.id.findSelected);

    myButton.setOnClickListener(new OnClickListener() 

        @Override
        public void onClick(View v) 

            StringBuffer responseText = new StringBuffer();
            responseText.append("Selected Languages are...\n");

            ArrayList<MotherTongues> stateList = dataAdapter.stateList;

            for (int i = 0; i < stateList.size(); i++) 
                MotherTongues state = stateList.get(i);

                if (state.isSelected()) 
                    responseText.append("\n" + state.getName());
                    Intent intent=new Intent(ReligionList.this,PhotosFragment.class);
                    startActivity(intent);

                
            

            Toast.makeText(getApplicationContext(), responseText,
                    Toast.LENGTH_SHORT).show();
        
    );

【问题讨论】：

在该列表的 onClickLister 中做你的事情

我知道在哪里做，但不知道该怎么做

【参考方案1】：

您需要将该数据保存在数组或其他数据结构中。

例子：

List<String> selectionList =new ArrayList<String>();
listView.setOnItemClickListener(new OnItemClickListener() 

    public void onItemClick(AdapterView<?> parent, View view,
            int position, long id) 
        // When clicked, show a toast with the TextView text
        MotherTongues state = (MotherTongues) parent.getItemAtPosition(position);
        Toast.makeText(getApplicationContext(),
                "Clicked on : " + state.getName(), Toast.LENGTH_LONG)
                .show();

        //check if its checkbox is checked, and if so add from list else remove from list
        if(isChecked)
            selectionList.add(state.getName());
        else
            selectionList.remove(state.getName());
    
);

最后在你的按钮点击或任何你想发回数据的地方：

String [] selectionArray = selectionList.toArray(new String[selectionList.size()]);

您可以使用intent.putExtra() 将字符串数组传递给另一个活动

intent.putExtra("selectionArray", selectionArray );

希望这会有所帮助。

【讨论】：

它显示错误，而我按照你所说的设置 if 条件

isChecked 会显示错误。您需要编写代码来检查它。等等，给你看例子。

但为此我需要适配器类，我将在哪里拥有这个

你有你的适配器类。只需在其中进行更改

【参考方案2】：

在Activity1 中，当您单击编辑文本图标时，您可以使用 startActivityforResult 开始您的活动，这样您就可以像这样获取 onActivityResult 方法的结果..

Intent 意图 = new Intent(Activity1.this, Activity2.class); startActivityForResult(intent, 0);

在同一个Activity1中添加

         @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) 
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);




             if (requestCode==0&&resultCode == RESULT_OK) 

            //recieve the arraylist of mother tounges sent from Activity2 with values set to true       for checked and false for unchecked...like this 

          ` data.getExtras().getStringArray(key);`


           //refresh your list view using arraylist recieved here from Activit2..



            
     

在 activity2 更新ArrayList时，母亲宣传母亲检查/未选中...

然后单击确定按钮，以这种方式完成您的活动..

 Intent intent = new Intent();
            intent.putExtra(key, your_arraylist);
            setResult(RESULT_OK, intent);
            finish();

这将在您的 Activity1 的 onActivityResult() 方法中发回数据

【讨论】：

你能告诉如何检查和取消检查

以及我将edittext与片段一起扩展的地方