Question

我真的是新手android。现在我尝试使用Header部分创建一个简单的自定义列表视图。但是在我运行程序后，listview项目无法点击。这是我的代码：

MainActivity.java

String procName= "{call PSTATISTIC}";
CallableStatement cs = conn.prepareCall(procName);
cs.executeQuery();

CustomAdapter.java

package io.hidayat.headerlistview;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;


public class MainActivity extends Activity {


    private CustomAdapter mAdapter;
    ListView listView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);
        listView = (ListView)findViewById(R.id.list_header_detail);

        mAdapter = new CustomAdapter(this);
        mAdapter.addSectionHeaderItem("Section #1");
        for (int i = 1; i < 30; i++) {
            mAdapter.addItem("Row Item #" + i);
            if (i % 4 == 0) {
                mAdapter.addSectionHeaderItem("Section #" + i);
            }
        }

        listView.setAdapter(mAdapter);
    }
}

标题和行XML是类似的。

package io.hidayat.headerlistview;

import java.util.ArrayList;
import java.util.TreeSet;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

class CustomAdapter extends BaseAdapter {

    private static final int TYPE_ITEM = 0;
    private static final int TYPE_SEPARATOR = 1;

    private ArrayList<String> mData = new ArrayList<String>();
    private TreeSet<Integer> sectionHeader = new TreeSet<Integer>();

    private LayoutInflater mInflater;

    public CustomAdapter(Context context) {
        mInflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    public void addItem(final String item) {
        mData.add(item);
        notifyDataSetChanged();
    }

    public void addSectionHeaderItem(final String item) {
        mData.add(item);
        sectionHeader.add(mData.size() - 1);
        notifyDataSetChanged();
    }

    @Override
    public int getItemViewType(int position) {
        return sectionHeader.contains(position) ? TYPE_SEPARATOR : TYPE_ITEM;
    }

    @Override
    public int getViewTypeCount() {
        return 2;
    }

    @Override
    public int getCount() {
        return mData.size();
    }

    @Override
    public String getItem(int position) {
        return mData.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder = null;
        int rowType = getItemViewType(position);

        if (convertView == null) {
            holder = new ViewHolder();
            switch (rowType) {
            case TYPE_ITEM:
                convertView = mInflater.inflate(R.layout.row, parent, false);
                holder.textView = (TextView) convertView.findViewById(R.id.text);
                break;
            case TYPE_SEPARATOR:
                convertView = mInflater.inflate(R.layout.header, parent, false);
                holder.textView = (TextView) convertView.findViewById(R.id.textSeparator);
                break;
            }
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
        holder.textView.setText(mData.get(position));

        return convertView;
    }

    public static class ViewHolder {
        public TextView textView;
    }

}

activity_main.xml中

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center_vertical"
    android:descendantFocusability="blocksDescendants" >

    <TextView
        android:id="@+id/text"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="#FFF"
        android:gravity="center_vertical"
        android:padding="5dp"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:textColor="#FF000000" />

</LinearLayout>

我是sory，但这是我的应用程序的屏幕截图：Renaud Bompuis's blog

Answer 1

您尚未应用OnItemClickListener。那就是问题所在。别担心。您可以看到以下示例，根据需要更改代码。

首先使用Class

实施您的OnItemClickListener

public class MainActivity extends Activity implements OnItemClickListener

然后将OnItemClickListener附加到您的list

listView.setOnItemClickListener(YourClassName.this);

然后覆盖onItemClick方法，以便在点击position时实现您的功能。

@Override
    public void onItemClick(AdapterView<?> adapter, View arg1, int position, long arg3) {
        // TODO Auto-generated method stub
        String item = adapter.getItemAtPosition(position).toString();
        Toast.makeText(Test.this, "CLICK: " + item, Toast.LENGTH_SHORT).show();
    }

如果您遇到任何麻烦，请告诉我。感谢。

Answer 2

在listview上调用以下方法

 listView.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {

            Toast.makeText(MainActivity.this, "clicked", Toast.LENGTH_SHORT).show();

        }
    });

Answer 3

行项目必须有一个像android:descendantFocusability="blocksDescendants".这样的参数用于您的行项目父级..它适用于具有CustomAdapter的列表视图..

无法使用自定义适配器单击listview android

3 个答案: