带有 Checkbox、RadioButton、Textview 和按钮的 Listview 在 android 中无法正常工作

Question

我正在创建一个 android 应用程序，我的应用程序的 UI 如下所示。

点击提交按钮时，我需要选中的复选框和单选按钮的值。

示例 Linux 未选中，cc（单选按钮）已选中。

记录在列表视图中动态填充，但我无法使其工作。很多 有问题。

1. 当我滚动列表视图时，单选按钮会被自动选中或取消选中，无法保持单选按钮的状态。
2. 单击按钮时未获得选定的单选按钮和复选框。

下面是我的布局以及java程序。建议我获取正确的值。

Main.xml

<ListView
    android:id="@+id/my_list"
    android:layout_width="fill_parent"
    android:layout_height="199dp" />

<Button
    android:id="@+id/submit"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Submit"
    />

row.xml

<TextView
    android:id="@+id/label"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@+id/label"
    android:layout_toRightOf="@+id/check"
    android:textSize="20sp" >
</TextView>

<CheckBox
    android:id="@+id/check"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_marginLeft="4dip"
    android:layout_marginRight="10dip"
    android:focusable="false"

    android:focusableInTouchMode="false" >
</CheckBox>

 <RadioGroup
     android:id="@+id/radioSex"
     android:layout_width="wrap_content"
     android:layout_height="fill_parent"
     android:layout_alignParentRight="true"
     android:layout_alignParentTop="true"
     android:orientation="horizontal" >

     <RadioButton
         android:id="@+id/to"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginLeft="10dip"
         android:checked="true"
         android:text="To" />

     <RadioButton
         android:id="@+id/cc"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginLeft="10dip"
         android:text="CC" />
 </RadioGroup>

MyAdaptor.java

public class MyAdapter extends ArrayAdapter<Model> {

    private final List<Model> list;
    private final Activity context;
    boolean checkAll_flag = false;
    boolean checkItem_flag = false;

    public MyAdapter(Activity context, List<Model> list) {
        super(context, R.layout.row, list);
        this.context = context;
        this.list = list;
    }

    static class ViewHolder {
        protected TextView text;
        protected CheckBox checkbox;

    }

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

        ViewHolder viewHolder = null;
        if (convertView == null) {
            LayoutInflater inflator = context.getLayoutInflater();
            convertView = inflator.inflate(R.layout.row, null);
            viewHolder = new ViewHolder();
            viewHolder.text = (TextView) convertView.findViewById(R.id.label);
            viewHolder.checkbox = (CheckBox) convertView
                    .findViewById(R.id.check);

            viewHolder.checkbox
                    .setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

                        @Override
                        public void onCheckedChanged(CompoundButton buttonView,
                                boolean isChecked) {
                            int getPosition = (Integer) buttonView.getTag();
                            list.get(getPosition).setSelected(
                                    buttonView.isChecked());
                        }
                    });
            convertView.setTag(viewHolder);
            convertView.setTag(R.id.label, viewHolder.text);
            convertView.setTag(R.id.check, viewHolder.checkbox);

        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }
        viewHolder.checkbox.setTag(position);

        viewHolder.text.setText(list.get(position).getName());
        viewHolder.checkbox.setChecked(list.get(position).isSelected());

        return convertView;
    }

MainActivity.java

public class MainActivity extends Activity implements OnItemClickListener {

    ListView listView;
    ArrayAdapter<Model> adapter;
    List<Model> list = new ArrayList<Model>();

    private RadioGroup radioCcToGroup;
    private RadioButton radioTypeButton;
    private Button btn;

    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);

        listView = (ListView) findViewById(R.id.my_list);

        btn = (Button) findViewById(R.id.submit);

        btn.setOnClickListener(new View.OnClickListener() {
            int count = 0;

            @Override
            public void onClick(View view) {


                count = listView.getAdapter().getCount();
                for (int i = 0; i < count; i++) {
                    // here i am not able to get the records as getting on onItemClick of the listview
                }
            }
        });

        adapter = new MyAdapter(this, getModel());
        listView.setAdapter(adapter);
        listView.setOnItemClickListener(this);
    }

    @Override
    public void onItemClick(AdapterView<?> arg0, View v, int position, long arg3) {
        TextView label = (TextView) v.getTag(R.id.label);
        CheckBox checkbox = (CheckBox) v.getTag(R.id.check);
        Toast.makeText(v.getContext(),
                label.getText().toString() + " " + isCheckedOrNot(checkbox),
                Toast.LENGTH_LONG).show();

    }

    private String isCheckedOrNot(CheckBox checkbox) {
        if (checkbox.isChecked())
            return "is checked";
        else
            return "is not checked";
    }

    private List<Model> getModel() {
        list.add(new Model("Linux"));
        list.add(new Model("Windows7"));
        list.add(new Model("Suse"));
        list.add(new Model("Eclipse"));
        list.add(new Model("Ubuntu"));
        list.add(new Model("Solaris"));
        list.add(new Model("Android"));
        list.add(new Model("iPhone"));
        list.add(new Model("Java"));
        list.add(new Model(".Net"));
        list.add(new Model("PHP"));
        return list;
    }

Model.java

private String name;
    private boolean selected;

    public Model(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public boolean isSelected() {
        return selected;
    }

    public void setSelected(boolean selected) {
        this.selected = selected;
    }

Answer 1

您的 MyAdaptor.java 上都有 2 个错误：

1. 当您附加onCheckedChangeListener 时，您只会在需要创建新视图并且您忘记列表视图重用视图的情况下才这样做。你应该在if (convertView == null)之外setOnCheckedChangeListener。

2. 似乎在滚动完成时也会调用 onCheckedChangeListener（因为viewHolder.checkbox.setChecked(list.get(position).isSelected());）。您可以通过使用OnClickListener 而不是viewHolder.checkbox 或不调用viewHolder.checkbox.setChecked() 来避免这种情况。

这是我的代码：

private class ViewHolder {
    protected TextView text;
    protected CheckBox checkbox;
    protected RadioGroup radioGroup;
}

public class MyAdapter extends ArrayAdapter<Model> {

    private final List<Model> list;
    private final Activity context;
    boolean checkAll_flag = false;
    boolean checkItem_flag = false;

    public MyAdapter(Activity context, List<Model> list) {
        super(context, R.layout.row, list);
        this.context = context;
        this.list = list;
    }

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

        ViewHolder viewHolder = null;
        if (convertView == null) {
            LayoutInflater inflator = context.getLayoutInflater();
            convertView = inflator.inflate(R.layout.row, null);

            viewHolder = new ViewHolder();
            viewHolder.text = (TextView) convertView.findViewById(R.id.label);
            viewHolder.checkbox = (CheckBox) convertView.findViewById(R.id.check);
            viewHolder.checkbox.setTag(position);
            viewHolder.radioGroup = (RadioGroup) convertView.findViewById(R.id.radioSex);
            viewHolder.radioGroup.setTag(position);

            convertView.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }

        viewHolder.text.setText(list.get(position).getName());
        viewHolder.checkbox.setChecked(list.get(position).isSelected());
        viewHolder.checkbox.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                CheckBox checkbox = (CheckBox) v;
                int getPosition = (Integer) checkbox.getTag();
                list.get(getPosition).setSelected(checkbox.isChecked());
            }
        });

        viewHolder.radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                boolean isCcOrIsTo = (checkedId == R.id.cc);
                int getPosition = (Integer) group.getTag();
                list.get(getPosition).setCcOrIsTo(isCcOrIsTo);
            }
        });

        return convertView;
    }
}

请注意，我也添加了对无线电组的一些控制，因此 Model.java 已更改：

public class Model {

    private String name;
    private boolean selected;
    private boolean isCcOrIsTo;

    public Model(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public boolean isSelected() {
        return selected;
    }

    public void setSelected(boolean selected) {
        this.selected = selected;
    }

    public boolean isCcOrIsTo() {
        return isCcOrIsTo;
    }

    public void setCcOrIsTo(boolean isCcOrIsTo) {
        this.isCcOrIsTo = isCcOrIsTo;
    }

    @Override
    public String toString() {
        String selectedString = selected ? "selected" : "not selected";
        String value = isCcOrIsTo ? "CC" : "To";
        return name+" -> "+selectedString+ " with value "+value;
    }
}

最后，您不需要在 MainActivity.java 上使用onItemClick，以在单击峰会按钮时检查值是否正确：

public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.activity_main);

    listView = (ListView) findViewById(R.id.my_list);

    btn = (Button) findViewById(R.id.submit);

    btn.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View view) {
            for (Model m : list) {
                Log.i("Stack1", m.toString());
            }
        }
    });

    ArrayAdapter<Model> adapter = new MyAdapter(this, getModel());
    listView.setAdapter(adapter);
}

希望对你有帮助；）