java - setOnItemClickListener 不起作用

Question

我的Listview应用程序从自定义适配器ListAdapter.class获取itemview的数据和背景颜色。我还需要在下面的textview中设置当前选定的列表项值listview，但是MAinActivity中的setOnItemClickListener没有执行。请帮忙。

这是我的 ListView 应用程序:

Layout image

MainActivity.java

public class MainActivity extends Activity {
private static ListAdapterclass adapter;
    ListView lv;
    TextView tv2;
    private  final String android_versions[]={
            "Donut",
            "Eclair",
            "Froyo",
            "Gingerbread",
            "Honeycomb",
            "Ice Cream Sandwich",
            "Jelly Bean",
            "KitKat",
            "Lollipop",
            "Marshmallow"
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initViews();
    }
    private  void initViews() {
        lv = (ListView) findViewById(R.id.listView1);
        tv2 = (TextView) findViewById(R.id.selected);

        adapter = new ListAdapterclass(getApplicationContext(), android_versions);
        lv.setAdapter(adapter);
        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                Toast.makeText(getApplicationContext(), "hiiiiiiiii", Toast.LENGTH_SHORT).show();
                System.out.println("********************** INSIDE  ONITEMCLICKLISTNER IN MAIN ACTIVITY ******************");
                String ver_name = (lv.getItemAtPosition(i)).toString();


                tv2 = (TextView) findViewById(R.id.selected);
                tv2.setText(ver_name);
            }
        });
    }
}

ListAdapter.class

public class ListAdapterclass extends ArrayAdapter implements AdapterView.OnItemClickListener{

    private String android_versionNames[];
    Context mContext;
    public int row_index=-1;

    @Override
    public void onItemClick(AdapterView<?> adapterView, View v, int i, long l) {
        int position=(Integer)v.getTag();
        String ver_name=getItem(position).toString();
    }

    private static class ViewHolder{
        TextView tv;
       LinearLayout LL;
        TextView tv2;
    }



    public ListAdapterclass(Context context,String android_versionnames[]) {
        super(context, R.layout.list_item,android_versionnames);
        this.android_versionNames=android_versionnames;
        this.mContext=context;

        System.out.println(" ????????????????????????  Inside dataadapter,Android names :  ?????????????????????????????\n  ");
        for(int i=0;i<android_versionnames.length;i++){
            System.out.println("\n"+android_versionnames[i]);
        }

    }
    private int lastPosition=-1;

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

        String ver_name=getItem(position).toString();

        final ViewHolder viewHolder;
        final View result;

        if(convertView==null){
            viewHolder=new ViewHolder();
            LayoutInflater inflater=LayoutInflater.from(getContext());
            convertView=inflater.inflate(R.layout.list_item,parent,false);
            viewHolder.tv=(TextView)convertView.findViewById(R.id.label);
            viewHolder.LL=(LinearLayout) convertView.findViewById(R.id.linearLayout_1);
            viewHolder.tv2=(TextView)convertView.findViewById(R.id.selected);
            result=convertView;
            convertView.setTag(viewHolder);
        }else{
            viewHolder=(ViewHolder) convertView.getTag();
            result=convertView;
        }
        lastPosition=position;

        viewHolder.tv.setText(ver_name);

        viewHolder.LL.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                row_index=position;
                notifyDataSetChanged();
            }
        });
        if(row_index==position){
            viewHolder.LL.setBackgroundColor(Color.parseColor("#409de1"));
            viewHolder.tv.setTextColor(Color.parseColor("#ffffff"));
        }
        else
        {
            viewHolder.LL.setBackgroundColor(Color.parseColor("#ffffff"));
            viewHolder.tv.setTextColor(Color.parseColor("#000000"));

        }
        return convertView;
    }
}

ActivityMain.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
android:orientation="vertical"
    tools:context="com.cybraum.test.listviewcolorchange.MainActivity"
    >
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="0dp"
android:clickable="true"
    android:layout_weight="1"
    >
 <ListView
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:id="@+id/listView1"
     >
 </ListView>


</LinearLayout>

 <LinearLayout
     android:layout_width="match_parent"
     android:layout_height="0dp"
     android:layout_weight=".2"
     android:id="@+id/linearLayout_2"
     android:orientation="horizontal"

     >
  <TextView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Selected : "
      android:textStyle="bold"
      android:layout_gravity="center"/>
  <TextView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:textStyle="bold"
      android:text="text"
      android:id="@+id/selected"
      android:layout_gravity="center"/>

 </LinearLayout>

</LinearLayout>

listitem.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="wrap_content"
    android:layout_width="fill_parent"
    android:id="@+id/linearLayout_1"
    android:padding="10dp">
<TextView
    android:id="@+id/label"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:padding="10dip"
    android:textSize="16dip"
    android:textStyle="bold"
    android:textColor="#000000"
    android:gravity="center">
</TextView>
</LinearLayout>

问题是什么？

Answer 1

从适配器中删除 viewHolder.LL.setOnClickListener 监听器并在您的适配器中添加一个方法来更新 row_index:

public void changeIndex(int rowIndex){
this.row_index = rowIndex;
notifyDataSetChanged();
}

从 onItemClickListener 事件调用此方法:

lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
adapter.changeIndex(i);//This will give you the same result of viewHolder.LL.setOnClickListener as you are doing
                //Do whatever you are doing previously
            }
        });