从列表视图错误的项目被选中 [英] Wrong item from the listview is selected

问题描述

最初，它显示所选择正确的项目......但是重新填充列表则显示错误的项目被选中后......请帮我找到错误

Intially列表中填充的onCreate（）
和重新填充在onOptionsItemSelected（菜单项项目）

 公共类MainActivity延伸活动{    MyListActivity适配器;
    ListView控件列表;    的String [] =网站{
            杰里
            沃尔特斯
    };
    整数[] = imageId {
            R.drawable.ic_launcher，
            R.drawable.ic_launcher
    };    @覆盖
    保护无效的onCreate（捆绑savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.activity_main）;
        适配器=新MyListActivity（MainActivity.this，网络，imageId）;
        名单=（ListView控件）findViewById（R.id.listView1）;
        list.setAdapter（适配器）;
        list.setOnItemClickListener（新AdapterView.OnItemClickListener（）{
            @覆盖
            公共无效onItemClick（适配器视图＆LT;＆GT;母公司，观景，INT位置，长的id）{
                Toast.makeText .show（）（MainActivity.this，+网站[+位置]，Toast.LENGTH_SHORT你在点击了）;
            }
        }）;
    }    @覆盖
    公共布尔onCreateOptionsMenu（菜单菜单）{
        //充气菜单;如果是present这增加了项目操作栏。
        。getMenuInflater（）膨胀（R.menu.main，菜单）;
        返回true;
    }    @覆盖
    公共布尔onOptionsItemSelected（菜单项项）{        开关（item.getItemId（））{            案例R.id.action_settings：
                的String [] = WEB2 {
                        沃尔特斯
                        杰里
                };
                适配器=新MyListActivity（MainActivity.this，web2上，imageId）;
                list.setAdapter（适配器）;
                返回true;
        }
        返回false;
    }}
 

解决方案

您有这

 网​​站[位置]
 //基于位置的web2上获得的Web字符串数组字符串不
 

位置是该指数。

 网​​站[0] =杰里
网站[1] =沃尔特斯
 

您重新填充的ListView你用不同的阵列。

网​​站和 web2的是两个不同的阵列。

如果要更新，更新Web数组并调用 notifyDataSetChanged 适配器刷新列表视图上

Initially it shows the correct item selected...but after re-populating the list it shows the wrong item being selected...please help me find the mistake

Intially the list is populated in onCreate() and is re-populated in onOptionsItemSelected(MenuItem item)

public class MainActivity extends Activity {

    MyListActivity adapter;
    ListView list;

    String[] web = {
            "jerry",
            "walters"
    } ;
    Integer[] imageId = {
            R.drawable.ic_launcher,
            R.drawable.ic_launcher      
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        adapter = new MyListActivity(MainActivity.this, web, imageId);
        list=(ListView)findViewById(R.id.listView1);
        list.setAdapter(adapter);
        list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view,int position, long id) {
                Toast.makeText(MainActivity.this, "You Clicked at " +web[+ position], Toast.LENGTH_SHORT).show();
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        switch (item.getItemId()) {

            case R.id.action_settings:
                String[] web2 = {
                        "walters",
                        "jerry"
                } ;
                adapter = new MyListActivity(MainActivity.this, web2, imageId);
                list.setAdapter(adapter);
                return true;
        }
        return false;
    }

}

解决方案

You have this

 web[position]
 // get string from  web string array not from web2 based on position

Position is the index.

web[0] = "jerry"
web[1] ="walters"

You are re-populating your listview with a different array.

web and web2 are two different arrays.

If you want to update , update the web array and call notifyDataSetChanged on your adapter to refresh listview

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