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我有4个按钮，通过点击每个按钮它发送它的ID到PHP和检查匹配ID，如果存在意味着它从JSON获取内容并显示在主activity.For我我点击每个按钮时可以传递id，但无法从json中获取id匹配的内容。如何检索更新的JSON在Android
我的Android的代码是在这里..
public class MainActivity extends Activity {
public GridView grid;
public ArrayList arr = new ArrayList();
public Map home = new HashMap();
public Long str_id;
String url = "http://10.0.2.2:80/android_connect/menu.php";
@Override
protected void onCreate(Bundle savedInstanceState) {
home.put("id",new Integer(1));
home.put("name",new String("home"));
home.put("pos",new Integer(1));
arr.add(home);
home = new HashMap();
home.put("id",new Integer(2));
home.put("name",new String("About Us"));
home.put("pos",new Integer(2));
arr.add(home);
home = new HashMap();
home.put("id",new Integer(3));
home.put("name",new String("Services"));
home.put("pos",new Integer(3));
arr.add(home);
home = new HashMap();
home.put("id",new Integer(4));
home.put("name",new String("Products"));
home.put("pos",new Integer(4));
arr.add(home);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
grid = (GridView) findViewById(R.id.gridView1);
grid.setAdapter(new ButtonAdapter(this));
grid.setOnItemClickListener(new OnItemClickListener(){
// private String ct_name;
public void onItemClick(AdapterView<?> parent,View v, int position, long id)
{
str_id = id;
Toast.makeText(getBaseContext(),
"button" + (id) + " selected",
Toast.LENGTH_LONG).show();
new CallLogin().execute(url);
new LongOperation().execute(url);
}
});
}
public class ButtonAdapter extends BaseAdapter {
private Context context;
public ButtonAdapter(Context c){
context = c;
}
public int getCount() {
//return filenames.length;
return arr.size();
}
public Object getItem(int position) {
Map p = (Map) arr.get(position);
return Integer.parseInt(p.get("pos").toString());
//return position;
}
public long getItemId(int position) {
//return position;
Map p = (Map) arr.get(position);
return Integer.parseInt(p.get("id").toString());
}
public View getView(int position, View convertView, ViewGroup parent){
Button btn;
if (convertView == null) {
btn = new Button(context);
btn.setLayoutParams(new GridView.LayoutParams(100, 100));
btn.setPadding(8, 8, 8, 8);
btn.setFocusable(false);
btn.setClickable(false);
}else {
btn = (Button) convertView;
}
Map m = (Map) arr.get(position);
{
btn.setText(m.get("name").toString()+":"+position);
btn.setTextColor(Color.WHITE);
btn.setId(Integer.parseInt(m.get("id").toString()));
}
return btn;
}
}
/************onclick button passes its id to php ***********/
class CallLogin extends AsyncTask<String, String, String>{
//private int position;
protected String doInBackground(String... params) {
List<NameValuePair> parms = new ArrayList<NameValuePair>();
parms.add(new BasicNameValuePair("pid",str_id.toString()));
try{
URL httpUrl = new URL(url);
HttpURLConnection connection = (HttpURLConnection) httpUrl.openConnection();
connection.setRequestMethod("POST");
connection.setDoInput(true);
connection.setDoOutput(true);
DataOutputStream wr = new DataOutputStream(connection.getOutputStream());
wr.writeBytes(URLEncodedUtils.format(parms, "utf-8"));
wr.flush();
wr.close();
int responseCode = connection.getResponseCode();
}catch (IOException e) {
e.printStackTrace();
}finally{
}
return null;
}
}
/************ fetching datas from json ***********/
private class LongOperation extends AsyncTask<String, Void, Void> {
// Required initialization
private final HttpClient Client = new DefaultHttpClient();
private String Content;
private String Error = null;
private ProgressDialog Dialog = new ProgressDialog(MainActivity.this);
String data ="";
TextView jsonParsed = (TextView) findViewById(R.id.jsonParsed);
int sizeData = 0;
protected void onPreExecute() {
Dialog.setMessage("Please wait..");
Dialog.show();
}
protected Void doInBackground(String... urls) {
/************ Make Post Call To Web Server ***********/
BufferedReader reader=null;
// Send data
try
{
// Defined URL where to send data
URL url = new URL(urls[0]);
// Send POST data request
URLConnection conn = url.openConnection();
conn.setDoOutput(true);
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
wr.write(data);
wr.flush();
// Get the server response
reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuilder sb = new StringBuilder();
String line = null;
// Read Server Response
while((line = reader.readLine()) != null)
{
// Append server response in string
sb.append(line + "");
}
// Append Server Response To Content String
Content = sb.toString();
}
catch(Exception ex)
{
Error = ex.getMessage();
}
finally
{
try
{
reader.close();
}
catch(Exception ex) {}
}
return null;
}
protected void onPostExecute(Void unused) {
Dialog.dismiss();
if (Error != null) {
jsonParsed.setText("Output : "+Error);
} else {
// Show Response Json On Screen (activity)
jsonParsed.setText(Content);
/****************** Start Parse Response JSON Data *************/
String OutputData = "";
JSONObject jsonResponse;
try {
/****** Creates a new JSONObject with name/value mappings from the JSON string. ********/
jsonResponse = new JSONObject(Content);
/***** Returns the value mapped by name if it exists and is a JSONArray. ***/
/******* Returns null otherwise. *******/
JSONArray jsonMainNode = jsonResponse.optJSONArray("menu");
/*********** Process each JSON Node ************/
int lengthJsonArr = jsonMainNode.length();
for(int i=0; i < lengthJsonArr; i++)
{
/****** Get Object for each JSON node.***********/
JSONObject jsonChildNode = jsonMainNode.getJSONObject(i);
//getIntent().getData();
/******* Fetch node values **********/
String Pid = jsonChildNode.optString("pid").toString();
String Content = jsonChildNode.optString("name").toString();
OutputData += "pid : "+ Pid +" "+ "content : "+ Content +" ";
}
// Show Parsed Output on screen (activity)
jsonParsed.setText(OutputData);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
在我的4个按钮，服务按键只有chidelement，所以如果上午点击服务按钮其ID将被通过，检查并取入该子elements.Here我的问题是，我无法检索相同的ID内容。这里是我的PHP代码。 ？
<?php
$con=mysql_connect("localhost","root","")or die("cannot connect");
$db=mysql_select_db("and_dynamicview",$con) or die("cannot select");
if(!isset($_REQUEST['pid']))
{
$sql = "select pid,name,refid,ord_field from menu where pid = 0 and stat != 'R'";
}
else
{
$sql = "select pid,name,refid,ord_field from menu where pid = ".$_REQUEST['pid']." and stat != 'R'";
}
$fp = fopen("./log.txt","a");
fwrite($fp,$sql."\n");
fclose($fp);
$result = mysql_query($sql);
$json = array();
$i = 0;
if(mysql_num_rows($result))
{
$json['page_menu']['flag'] = 'M';
while($row=mysql_fetch_assoc($result))
{
$json['menu'][$i]['pid']=ucwords($row['pid']);
$json['menu'][$i]['name']=$row['name'];
$json['menu'][$i]['refid']=$row['refid'];
$json['menu'][$i++]['ord_field']=$row['ord_field'];
}
}
else
{
$sql = "select * from page where pid=3";
$result = mysql_query($sql);
$json = array();
if(mysql_num_rows($result))
{
while($row=mysql_fetch_assoc($result))
$json ['page_menu']['flag'] = 'P';
{ $json['page'][]=$row;
}
}
}
mysql_close($con);
echo json_encode($json);
?>
我的菜单JSON是..
{"page_menu":{"flag":"M"},"menu":[{"pid":"0","name":"Home","refid":"1","ord_field":"1"},{"pid":"0","name":"About Us","refid":"2","ord_field":"2"},{"pid":"0","name":"Services","refid":"3","ord_field":"3"},{"pid":"0","name":"Products","refid":"4","ord_field":"4"}]}
menu.php PID = 3是
{"page_menu":{"flag":"M"},"menu":[{"pid":"3","name":"24X7","refid":"5","ord_field":"2"},{"pid":"3","name":"8X5","refid":"6","ord_field":"1"}]}
你的意思是说，在PHP中没有收到yopu从android应用程序传递给PHP的ID？ – Vaibs
你可以请你的JSON响应。 –
id我通过但检索相应的id内容不正确.ie菜单？pid = 3 json是这样的.. {“flag”：“M”，“menu”：[{“pid”：“3”，“命名 “：” 24X7" ， “REFID”： “5”， “ord_field”： “2”}，{ “PID”： “3”， “名称”： “8X5”， “REFID”： “6”，” ord_field“：”1“}]}。 – ammu