Android的ListActivity排点击 [英] Android ListActivity row click

问题描述

我有一个显示有关信息的玩家的活动。这部分工作正常。 （我用了一个适配器）。但我应该在哪里把code单击某一行，当检测？

PlayersActivity.java

 包com.democratandchronicle.billstrainingcamp;进口android.os.Bundle;公共类PlayersActivity扩展ListActivity
{    @覆盖
    保护无效的onCreate（捆绑savedInstanceState）
    {
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.activity_players）;
        PlayersAdapter适配器=新PlayersAdapter（本）;
        getListView（）setAdapter（适配器）。
        PlayersFetchTask loadPlayersTask =新PlayersFetchTask（适配器）;
        loadPlayersTask.execute（）;
    }
}
 

PlayersAdapter.java

 包com.democratandchronicle.billstrainingcamp;
进口org.json.JSONArray;
进口org.json.JSONException;
进口org.json.JSONObject;进口android.content.Context;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.ViewGroup;
进口android.widget.BaseAdapter;
进口android.widget.ImageView;
进口android.widget.RelativeLayout;
进口android.widget.TextView;公共类PlayersAdapter延伸BaseAdapter {    私人上下文的背景下;
    私人LayoutInflater layoutInflater;
    私人JSONArray项=新JSONArray（）;
    私人DrawableManager DM;
    公共PlayersAdapter（上下文的背景下）{
        超（）;
        this.context =背景;
        this.layoutInflater =（LayoutInflater）this.context
                .getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
        this.dm =新DrawableManager（）;
    }    @覆盖
    公众诠释的getCount（）{
        返回this.entries.length（）;
    }    @覆盖
    公共对象的getItem（INT位置）{
        尝试{
            返回this.entries.getJSONObject（位置）;
        }赶上（JSONException E）{
            // TODO自动生成catch块
            e.printStackTrace（）;
        }
        返回null;
    }    @覆盖
    众长getItemId（INT位置）{
        返回的位置;
    }    @覆盖
    公共查看getView（INT位置，查看convertView，父母的ViewGroup）{        RelativeLayout的playerRowView;        如果（convertView == NULL）
        {
            playerRowView =（RelativeLayout的）this.layoutInflater.inflate（R.layout.player_row，父母，假）;
        }
        其他
        {
            playerRowView =（RelativeLayout的）convertView;
        }        TextView的playerNameText =（TextView中）playerRowView.findViewById（R.id.playerName）;
        TextView的playerPositionText =（TextView中）playerRowView.findViewById（R.id.playerPosition）;
        ImageView的playerImageView =（ImageView的）playerRowView.findViewById（R.id.playerImage）;        尝试
        {
            JSONObject的数据行= this.entries.getJSONObject（位置）;
            playerNameText.setText（dataRow.getString（名字）++ dataRow.getString（姓氏））;
            playerPositionText.setText（dataRow.getString（位置））;
            如果（！dataRow.getString（照片）。等于（））
            {
                this.dm.fetchDrawableOnThread（dataRow.getString（照片），playerImageView）;
            }        }
        赶上（JSONException E）
        {
            // TODO自动生成catch块
            e.printStackTrace（）;
        }
        返回playerRowView;
    }    公共无效upDateEntries（JSONArray项）
    {
        this.entries =条目;
        this.notifyDataSetChanged（）;
    }}
 

解决方案

  

应该在哪里我把code单击某一行，当检测？

要随时随地检测一下就行，请使用 OnItemClickListener 在你的活动。

要检测每行不同区域点击，使用 OnClickListeners 内您的适配器 getView（）。

此外，如果您使用ViewHolder方法，你可以创建一个稍快适配器。该谷歌对话武装您的UI 讨论这和其他良好做法详细信息。

---

加入

  

我会怎么做这在我的活动？

ListActivities有OnListItemClick内置，回调有一个稍微不同的名称：<一href=\"https://developer.android.com/reference/android/app/ListActivity.html#onListItemClick%28android.widget.ListView,%20android.view.View,%20int,%20long%29\"相对=nofollow> onListItemClick（） 。使用它像这样：

  @覆盖
保护无效onListItemClick（ListView中升，视图V，INT位置，长的id）{
    Toast.makeText（这一点，点击了排+位置，Toast.LENGTH_SHORT）.show（）;
}
 

I have an activity that displays information about a player. This part works fine. (I used an adapter). But where should I put the code that detects when a row is clicked?

PlayersActivity.java

package com.democratandchronicle.billstrainingcamp;

import android.os.Bundle;

public class PlayersActivity extends ListActivity 
{

    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_players);
        PlayersAdapter adapter = new PlayersAdapter(this);
        getListView().setAdapter(adapter);
        PlayersFetchTask loadPlayersTask = new PlayersFetchTask(adapter);
        loadPlayersTask.execute(); 
    }
}

PlayersAdapter.java

package com.democratandchronicle.billstrainingcamp;


import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;

public class PlayersAdapter extends BaseAdapter {

    private Context context;
    private LayoutInflater layoutInflater;
    private JSONArray entries = new JSONArray();
    private DrawableManager dm;
    public PlayersAdapter(Context context) {
        super();
        this.context = context;
        this.layoutInflater = (LayoutInflater) this.context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        this.dm = new DrawableManager();
    }

    @Override
    public int getCount() {
        return this.entries.length();
    }

    @Override
    public Object getItem(int position) {
        try {
            return this.entries.getJSONObject(position);
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
    }

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

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

        RelativeLayout playerRowView;

        if (convertView == null)
        {
            playerRowView = (RelativeLayout) this.layoutInflater.inflate(R.layout.player_row, parent, false);
        }
        else
        {
            playerRowView = (RelativeLayout) convertView;
        }

        TextView playerNameText = (TextView) playerRowView.findViewById(R.id.playerName);
        TextView playerPositionText = (TextView) playerRowView.findViewById(R.id.playerPosition);
        ImageView playerImageView = (ImageView) playerRowView.findViewById(R.id.playerImage);

        try 
        {
            JSONObject dataRow = this.entries.getJSONObject(position);
            playerNameText.setText(dataRow.getString("firstName") + " "+ dataRow.getString("lastName"));
            playerPositionText.setText(dataRow.getString("position"));
            if (!dataRow.getString("photo").equals(""))
            {
                this.dm.fetchDrawableOnThread(dataRow.getString("photo"), playerImageView);
            }

        } 
        catch (JSONException e) 
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return playerRowView;
    }

    public void upDateEntries(JSONArray entries)
    {
        this.entries = entries;
        this.notifyDataSetChanged();
    }

}

解决方案

Where should I put the code that detects when a row is clicked?

To detect a click anywhere on the row, use an OnItemClickListener in your Activity.

To detect clicks in different regions on each row, use OnClickListeners inside your Adapter's getView().

Also you can create a slightly faster Adapter if you use the ViewHolder method. The Google Talk TurboCharge Your UI discussions this and other good practices in detail.

---

Addition

How would I do this in my activity?

ListActivities have an OnListItemClick built-in, the callback has a slightly different name: onListItemClick(). Use it like so:

@Override
protected void onListItemClick (ListView l, View v, int position, long id) {
    Toast.makeText(this, "Clicked row " + position, Toast.LENGTH_SHORT).show();
}

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