所以我为ListView中的每个项目声明了一个按钮，但它发生的是它响应更多的项目，然后只响应被点击的项目。例如，如果我按下第一个按钮的按钮，第9和第18项也会被更改。如果你可以帮我解决这个问题，那将是非常棒的:)提前感谢
This is the CusomtListAdapter which fills the ListView
public class CustomListAdapter extends BaseAdapter {
private ArrayList<Task> tasks;
private LayoutInflater inflater = null;
private Application application;
public CustomListAdapter(Activity activity, Application application,
ArrayList<Task> tasks) {
this.application = application;
this.tasks = tasks;
inflater = (LayoutInflater) application.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public static class ViewHolder {
TextView lv_tv_description;
TextView lv_tv_period;
Button lv_bt_done;
TextView lv_gone_pk;
TextView lv_gone_group_pk;
TextView lv_gone_description;
TextView lv_gone_period;
TextView lv_gone_period_kind;
TextView lv_gone_time;
TextView lv_gone_done;
}
@Override
public int getCount() {
return tasks.size();
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(final int position, View vi, ViewGroup parent) {
final ViewHolder viewHolder;
if (vi == null) {
vi = inflater.inflate(R.layout.listview, parent, false);
viewHolder = new ViewHolder();
viewHolder.lv_tv_description = (TextView) vi.findViewById(R.id.lv_tv_description);
viewHolder.lv_tv_period = (TextView) vi.findViewById(R.id.lv_tv_period);
viewHolder.lv_bt_done = (Button) vi.findViewById(R.id.lv_bt_done);
viewHolder.lv_gone_pk = (TextView) vi.findViewById(R.id.lv_gone_pk);
viewHolder.lv_gone_group_pk = (TextView) vi.findViewById(R.id.lv_gone_group_pk);
viewHolder.lv_gone_description = (TextView) vi.findViewById(R.id.lv_gone_description);
viewHolder.lv_gone_period = (TextView) vi.findViewById(R.id.lv_gone_period);
viewHolder.lv_gone_period_kind = (TextView) vi.findViewById(R.id.lv_gone_period_kind);
viewHolder.lv_gone_time = (TextView) vi.findViewById(R.id.lv_gone_time);
viewHolder.lv_gone_done = (TextView) vi.findViewById(R.id.lv_gone_done);
vi.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) vi.getTag();
}
viewHolder.lv_tv_description.setText(tasks.get(position).getDescription());
viewHolder.lv_tv_period.setText(tasks.get(position).getPeriod_kind());
viewHolder.lv_bt_done.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
DatabaseHandler dbhandler = new DatabaseHandler(application);
View pk_view = (View) v.getParent().getParent().getParent();
TextView textview_pk = ((TextView) pk_view.findViewById(R.id.lv_gone_pk));
View parentView = (View) v.getParent().getParent();
TextView textview1 = ((TextView) parentView.findViewById(R.id.lv_tv_description));
TextView textview2 = ((TextView) parentView.findViewById(R.id.lv_tv_period));
Button button = ((Button) parentView.findViewById(R.id.lv_bt_done));
if (viewHolder.lv_bt_done.getText().toString().equalsIgnoreCase("done")) {
viewHolder.lv_tv_description.setPaintFlags(viewHolder.lv_tv_description.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
viewHolder.lv_gone_description.setPaintFlags(viewHolder.lv_gone_description.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
viewHolder.lv_bt_done.setText("UNDO");
viewHolder.lv_bt_done.setBackgroundResource(R.drawable.layout_rounded_background_accent);
notifyDataSetChanged();
dbhandler.updateDone(Integer.valueOf(textview_pk.getText().toString()), "true");
} else if (viewHolder.lv_bt_done.getText().toString().equalsIgnoreCase("undo")) {
viewHolder.lv_tv_description.setPaintFlags(viewHolder.lv_tv_description.getPaintFlags() & (~Paint.STRIKE_THRU_TEXT_FLAG));
viewHolder.lv_gone_description.setPaintFlags(viewHolder.lv_gone_description.getPaintFlags() & (~Paint.STRIKE_THRU_TEXT_FLAG));
viewHolder.lv_bt_done.setText("DONE");
viewHolder.lv_bt_done.setBackgroundResource(R.drawable.layout_rounded_background);
notifyDataSetChanged();
dbhandler.updateDone(Integer.valueOf(textview_pk.getText().toString()), "false");
}
dbhandler.close();
}
});
viewHolder.lv_gone_pk.setText(String.valueOf(tasks.get(position).getPk()));
if (tasks.get(position).getDone().equalsIgnoreCase("true")) {
viewHolder.lv_tv_description.setPaintFlags(viewHolder.lv_tv_description.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
viewHolder.lv_tv_period.setPaintFlags(viewHolder.lv_tv_description.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
viewHolder.lv_bt_done.setText("UNDO");
viewHolder.lv_bt_done.setBackgroundResource(R.drawable.layout_rounded_background_accent);
}
return vi;
}}
这是所有项目的匹配布局文件
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:focusable="false"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="70dp">
<LinearLayout
android:focusable="false"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:focusable="false"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1">
<RelativeLayout
android:focusable="false"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1">
<TextView
android:focusable="false"
android:id="@+id/lv_tv_description"
android:textSize="20dp"
android:textColor="@android:color/black"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginTop="7dp"/>
</RelativeLayout>
<RelativeLayout
android:focusable="false"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="2">
<TextView
android:focusable="false"
android:id="@+id/lv_tv_period"
android:textColor="@android:color/black"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"/>
</RelativeLayout>
</LinearLayout>
<RelativeLayout
android:focusable="false"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="4">
<Button
android:id="@+id/lv_bt_done"
android:text="DONE"
android:focusable="false"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:layout_marginTop="10dp"
android:background="@drawable/layout_rounded_background"/>
</RelativeLayout>
</LinearLayout>
<!-- invisible TextViews -->
<TextView
android:focusable="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/lv_gone_pk"
android:visibility="visible"
android:layout_alignParentRight="true"/>
<TextView
android:focusable="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/lv_gone_group_pk"
android:visibility="visible"
android:layout_alignParentRight="true"/>
<TextView
android:focusable="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/lv_gone_description"
android:visibility="gone"
android:layout_alignParentRight="true"/>
<TextView
android:focusable="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/lv_gone_period"
android:visibility="gone"
android:layout_alignParentRight="true"/>
<TextView
android:focusable="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/lv_gone_period_kind"
android:visibility="gone"
android:layout_alignParentRight="true"/>
<TextView
android:focusable="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/lv_gone_time"
android:visibility="gone"
android:layout_alignParentRight="true"/>
<TextView
android:focusable="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/lv_gone_done"
android:visibility="gone"
android:layout_alignParentRight="true"/>
</RelativeLayout>
如果您还有其他需要，请在评论中告诉我们：）
答案 0 :(得分：1)
View通过ListView方法的第二个参数（convertView）在getView()中重复使用。
从文档中
convertView - 如果可能，重用旧视图。注意：你应该 检查此视图是否为非null且之前是否为适当的类型 使用。如果无法转换此视图以显示 正确的数据，这种方法可以创建一个新的视图。
因此，在任何时候，只有设备屏幕上可见的视图数量（加上几个）才能在内存中使用。当您滚动列表时，屏幕上的视图将重新用于进入屏幕的项目。
在您的情况下，第1项，第9项和第18项与重复使用的View相同。这就是为什么当您仅在第一项上按下按钮时，第9项和第18项的更改View。
解决方案：
按下按钮时，在某些数据结构中添加该状态信息。例如，在array booleans中，对于按钮处于按下状态的项目保存为true，对其他按钮保存为false。
在getView()方法中，检查该布尔数组中的按钮状态并分别更改视图。