Php android:如何在从数据库填充的listview中插入按钮?

Php android:如何在从数据库填充的listview中插入按钮?,php,android,mysql,listview,Php,Android,Mysql,Listview,我是开发android的新手。我想在listview中由mysql填充的每一行中插入按钮。我一直在遵循这个教程从 我渴望学习 public class RollCall extends Activity { private String jsonResult; private String url = "http://rektitmate.com/webservices/student_details.php"; private ListView listView;

我是开发android的新手。我想在listview中由mysql填充的每一行中插入按钮。我一直在遵循这个教程从 我渴望学习

public class RollCall extends Activity {
    private String jsonResult;
    private String url =  "http://rektitmate.com/webservices/student_details.php";
    private ListView listView;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_roll_call);
        listView = (ListView) findViewById(R.id.listView1);
        listView.setItemsCanFocus(false);
         accessWebService();

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

    // Async Task to access the web
    private class JsonReadTask extends AsyncTask<String, Void, String> {
        @Override
        protected String doInBackground(String... params) {
            HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost(params[0]);
            try {
                HttpResponse response = httpclient.execute(httppost);
                jsonResult = inputStreamToString(
                        response.getEntity().getContent()).toString();
            }

            catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }

        private StringBuilder inputStreamToString(InputStream is) {
            String rLine = "";
            StringBuilder answer = new StringBuilder();
            BufferedReader rd = new BufferedReader(new InputStreamReader(is));

            try {
                while ((rLine = rd.readLine()) != null) {
                    answer.append(rLine);
                }
            }

            catch (IOException e) {
                // e.printStackTrace();
                Toast.makeText(getApplicationContext(),
                        "Error..." + e.toString(), Toast.LENGTH_LONG).show();
            }
            return answer;
        }
        @Override
        protected void onPostExecute(String result) {
            Listout();
        }
    }// end async task
    public void accessWebService() {
        JsonReadTask task = new JsonReadTask();
        // passes values for the urls string array
        task.execute(new String[] { url });
    }
    // build hash set for list view
    public void Listout() {
        List<Map<String, String>> StudentList = new ArrayList<Map<String, String>>();
        try {
            JSONObject jsonResponse = new JSONObject(jsonResult);
            JSONArray jsonMainNode = jsonResponse.optJSONArray("student");

            for (int i = 0; i < jsonMainNode.length(); i++) {
                JSONObject jsonChildNode = jsonMainNode.getJSONObject(i);
                String name = jsonChildNode.optString("student name");
                String number = jsonChildNode.optString("stuid");
                String outPut = number + "." + name;
                StudentList.add(createStudent("student", outPut));
            }
        } catch (JSONException e) {
            Toast.makeText(getApplicationContext(), "Error" + e.toString(),
                    Toast.LENGTH_SHORT).show();
        }
        SimpleAdapter simpleAdapter = new SimpleAdapter(this, StudentList,
                android.R.layout.simple_list_item_1,
                new String[] { "student" }, new int[] { android.R.id.text1 });

        listView.setAdapter(simpleAdapter);
    }
    private HashMap<String, String> createStudent(String name, String number) {
        HashMap<String, String> studentNameNo = new HashMap<String, String>();
        studentNameNo.put(name, number);
        return studentNameNo;
    }
}
公共类RollCall扩展活动{
私有字符串jsonResult;
专用字符串url=”http://rektitmate.com/webservices/student_details.php";
私有列表视图列表视图;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity\u roll\u call);
listView=(listView)findViewById(R.id.listView1);
setItemsCanFocus(false);
accessWebService();
}
@凌驾
公共布尔onCreateOptions菜单(菜单){
//为菜单充气;这会将项目添加到操作栏(如果存在)。
getMenuInflater().充气(R.menu.menu\u roll\u call,menu);
返回true;
}
//访问web的异步任务
私有类JsonReadTask扩展了AsyncTask{
@凌驾
受保护的字符串doInBackground(字符串…参数){
HttpClient HttpClient=新的DefaultHttpClient();
HttpPost HttpPost=新的HttpPost(参数[0]);
试一试{
HttpResponse response=httpclient.execute(httppost);
jsonResult=inputStreamToString(
response.getEntity().getContent()).toString();
}
捕获(客户端协议例外e){
e、 printStackTrace();
}捕获(IOE异常){
e、 printStackTrace();
}
返回null;
}
私有StringBuilder inputStreamToString(InputStream为){
字符串rLine=“”;
StringBuilder answer=新建StringBuilder();
BufferedReader rd=新的BufferedReader(新的InputStreamReader(is));
试一试{
而((rLine=rd.readLine())!=null){
答:追加(rLine);
}
}
捕获(IOE异常){
//e.printStackTrace();
Toast.makeText(getApplicationContext(),
“错误…”+e.toString(),Toast.LENGTH_LONG).show();
}
返回答案;
}
@凌驾
受保护的void onPostExecute(字符串结果){
Listout();
}
}//结束异步任务
public void accessWebService(){
JsonReadTask=新建JsonReadTask();
//传递URL字符串数组的值
执行(新字符串[]{url});
}
//为列表视图生成哈希集
公开作废列表(){
List StudentList=new ArrayList();
试一试{
JSONObject jsonResponse=新的JSONObject(jsonResult);
JSONArray jsonMainNode=jsonResponse.optJSONArray(“学生”);
for(int i=0;i
您希望在每个列表项布局中都有该按钮还是动态添加它?我希望在列表的每一行中都有该按钮,然后您必须构建一个自定义XML布局,而不是使用本机android布局。哦,好的,我想我知道了。我现在就试试。谢谢你,冠军。我会尽力的你还在做这个吗?我也这样做了,在ListView中添加按钮是很常见的。