填充從MySQL數據庫中的兩個紗廠是依賴於彼此

Question

我有2個紗廠一個省和其他的城市，如果我在省選中豪登微調第二微調必須證明約翰內斯堡，比勒陀利亞，百夫長，如果我在選擇KZN省我想第二微調顯示Petermaritsburg，德班，烏倫迪

這裏是我的代碼，我曾嘗試使用，但在all.i不工作將你並欣賞幫助

int ct_id; 
    String[] ct_name = null; 

    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.extras); 

     provins = (Spinner) findViewById(R.id.spinprovince); 
     city = (Spinner) findViewById(R.id.spincity); 

     save = (Button) findViewById(R.id.btnsave); 

      String result = null; 
      InputStream is = null; 
      StringBuilder sb = null; 
      // http post 
      try { 
       HttpClient httpclient = new DefaultHttpClient(); 
       HttpPost httppost = new HttpPost("http://10.0.2.2/php/ttz.php"); 
       // httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); 
       HttpResponse response = httpclient.execute(httppost); 
       HttpEntity entity = response.getEntity(); 
       is = entity.getContent(); 
      } catch (Exception e) { 
       Log.e("log_tag", "Error in http connection" + e.toString()); 
      } 
      // convert response to string 
      try { 
       BufferedReader reader = new BufferedReader(new InputStreamReader(
         is, "iso-8859-1"), 8); 
       sb = new StringBuilder(); 
       sb.append(reader.readLine() + "\n"); 
       String line = "0"; 
       while ((line = reader.readLine()) != null) { 
        sb.append(line + "\n"); 
       } 
       is.close(); 
       result = sb.toString(); 
      } catch (Exception e) { 
       Log.e("log_tag", "Error converting result " + e.toString()); 
      } 
      // paring data 
      JSONArray jArray; 
      try { 
       jArray = new JSONArray(result); 
       JSONObject json_data = null; 
       ct_name = new String[jArray.length()]; 
       for (int i = 0; i < jArray.length(); i++) { 
        json_data = jArray.getJSONObject(i); 
        ct_id = json_data.getInt("idprovince"); 
        ct_name[i] = json_data.getString("provincename"); 


     ArrayAdapter aa = new ArrayAdapter(this,android.R.layout.simple_spinner_item,ct_name); 

     aa.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
        provins.setAdapter(aa); 


       } 
      } catch (JSONException e1) { 
       Toast.makeText(getBaseContext(), "No City Found", Toast.LENGTH_LONG) 
         .show(); 
      } catch (ParseException e1) { 
       e1.printStackTrace(); 
      } 
} 

} 

Answer 1

試試這個代碼。 ..

public class MainActivity extends Activity { 
InputStream is=null; 
String result=null; 
String line=null; 

String[] roll_no,name; 

Spinner spinner1,spinner2; 



@Override 
public void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_main); 

spinner1 = (Spinner) findViewById(R.id.spinner1); 
spinner2 = (Spinner) findViewById(R.id.spinner2); 
final List<String> list1 = new ArrayList<String>(); 
final List<String> list2 = new ArrayList<String>(); 

Button b=(Button) findViewById(R.id.button1); 

b.setOnClickListener(new View.OnClickListener() { 

@Override 
public void onClick(View v) 
{ 
       // TODO Auto-generated method stub 

try 
{ 
HttpClient httpclient = new DefaultHttpClient(); 
HttpPost httppost = new HttpPost("http://10.0.2.2/spinner.php"); 
HttpResponse response = httpclient.execute(httppost); 
Log.e("Fail 1", "3"); 

HttpEntity entity = response.getEntity(); 
Log.e("Fail 1", "4"); 

is = entity.getContent(); 
Log.e("Pass 1", "connection success "); 
} 
catch(Exception e) 
{ 
Log.e("Fail 1", e.toString()); 
Toast.makeText(getApplicationContext(), "Invalid IP Address",Toast.LENGTH_LONG).show(); 
finish(); 
}  


try 
{ 
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8); 
StringBuilder sb = new StringBuilder(); 
while ((line = reader.readLine()) != null) 
{ 
sb.append(line + "\n"); 
} 
is.close(); 
result = sb.toString(); 
} 
catch(Exception e) 
{ 
Log.e("Fail 2", e.toString()); 
}  


try 
{ 
JSONArray JA=new JSONArray(result); 
JSONObject json= null; 
roll_no = new String[JA.length()];  
name = new String[JA.length()]; 

for(int i=0;i<JA.length();i++) 
{ 
json=JA.getJSONObject(i); 
roll_no[i] = json.getString("roll_no"); 
name[i]=json.getString("name"); 
} 
Toast.makeText(getApplicationContext(), "sss",Toast.LENGTH_LONG).show(); 

for(int i=0;i<roll_no.length;i++) 
{ 
list1.add(roll_no[i]); 
list2.add(name[i]); 
} 

spinner_fn(); 

} 
catch(Exception e) 
{ 

Log.e("Fail 3", e.toString()); 
//login.this.finish(); 

} 
} 
}); 

} 


private void spinner_fn() { 
// TODO Auto-generated method stub 

ArrayAdapter<String> dataAdapter1 = new ArrayAdapter<String>(getApplicationContext(), 
           android.R.layout.simple_spinner_item, roll_no); 
dataAdapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
spinner1.setAdapter(dataAdapter1); 


ArrayAdapter<String> dataAdapter2 = new ArrayAdapter<String>(getApplicationContext(), 
           android.R.layout.simple_spinner_item, name); 
dataAdapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
spinner2.setAdapter(dataAdapter2); 


spinner1.setOnItemSelectedListener(new OnItemSelectedListener() 
{ 
@Override 
public void onItemSelected(AdapterView<?> arg0, View arg1,int position, long id) 
{ 
// TODO Auto-generated method stub 

spinner2.setSelection(position); 

} 

@Override 
public void onNothingSelected(AdapterView<?> arg0) 
{ 
// TODO Auto-generated method stub 
} 

}); 


spinner2.setOnItemSelectedListener(new OnItemSelectedListener() { 

@Override 
public void onItemSelected(AdapterView<?> arg0, View arg1,int position, long arg3) { 
// TODO Auto-generated method stub 

spinner1.setSelection(position); 

} 

@Override 
public void onNothingSelected(AdapterView<?> arg0) { 
// TODO Auto-generated method stub 
} 
}); 

} 

不要忘記給Androidmanifest權限：

<uses-permission android:name="android.permission.INTERNET"/> 

而且你spinner.php文件：

<?php 
$host='127.0.0.1'; 
$uname='root'_name; 
$pwd='password'; 
$db='android'; 
$con = mysql_connect($host,$uname,$pwd) or die("connection failed"); 
mysql_select_db($db,$con) or die("db selection failed"); 
$r=mysql_query("select * from class",$con); 
while($row=mysql_fetch_array($r)) 
{ 
$cls[]=$row; 
//echo $fin."<br>"; 
} 
print(json_encode($cls)); 
mysql_close($con); 
?> 

Answer 2

見this tutorial如何從MySQL在下拉菜單 [DropDownList的/ Android的微調獲取數據從PHP和MySQL使用JSON