MYSQLにアンドロイドを接続する際にクラスを解決できない例外がありますか？

Question

私はWAMPサーバー上でアンドロイドとデータベースとの間の接続を試みています。アプリケーションを実行すると例外が発生するのはなぜですか？どのように私はそれを解決することができますか？ city.PHP私はネット上で多くのことを検索し、私は、コードを見直し回以上、私はPHPスクリプトを実行すると、それが正常に動作し、データを返しますが、例外がまだ

存在し、これは私のコード

です

<?php 
mysql_connect("localhost","username","pass"); 
mysql_select_db("Deal"); 
$sql=mysql_query("select * from City where Name like 'R%' "); 
while($row=mysql_fetch_assoc($sql)) 
$output[]=$row; 
print(json_encode($output)); 
mysql_close(); 
?> 

City.java

public class City extends Activity { 
/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) 
{ 

    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    parseJSON(); 

} 


void parseJSON() 
{ 
    String result = ""; 
    String x = ""; 
    InputStream is=null; 
//http post 
try{ 
ArrayList nameValuePairs = new ArrayList(); 
HttpClient httpclient = new DefaultHttpClient(); 
HttpPost httppost = new HttpPost("http://localhost/city.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); 
StringBuilder sb = new StringBuilder(); 
String line = null; 
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()); 
} 
//parse json data 
try{ 
JSONArray jArray = new JSONArray(result); 
JSONObject json_data=null; 
for(int i=0;i<jArray.length();i++) 
{ 
    json_data = jArray.getJSONObject(i); 
    Log.i("log_tag","id: "+json_data.getString("City_ID")+", name: "+json_data.getString("Name")); 
} 
} 
catch(JSONException e){ 
Log.e("log_tag", "Error parsing data "+e.toString()); 
} 
} 
} 

logcat

 
03-18 22:12:21.553: W/dalvikvm(491): threadid=1: thread exiting with uncaught exception (group=0x40014760) 
03-18 22:12:21.583: E/AndroidRuntime(491): FATAL EXCEPTION: main 
03-18 22:12:21.583: E/AndroidRuntime(491): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.JSON/com.JSON.JSONexActivity}: java.lang.ClassNotFoundException: com.JSON.JSONexActivity in loader dalvik.system.PathClassLoader[/data/app/com.JSON-2.apk] 
03-18 22:12:21.583: E/AndroidRuntime(491): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1739) 
03-18 22:12:21.583: E/AndroidRuntime(491): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1831) 
03-18 22:12:21.583: E/AndroidRuntime(491): at android.app.ActivityThread.access$500(ActivityThread.java:122) 
03-18 22:12:21.583: E/AndroidRuntime(491): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1024) 
03-18 22:12:21.583: E/AndroidRuntime(491): at android.os.Handler.dispatchMessage(Handler.java:99) 
03-18 22:12:21.583: E/AndroidRuntime(491): at android.os.Looper.loop(Looper.java:132) 
03-18 22:12:21.583: E/AndroidRuntime(491): at android.app.ActivityThread.main(ActivityThread.java:4123) 
03-18 22:12:21.583: E/AndroidRuntime(491): at java.lang.reflect.Method.invokeNative(Native Method) 
03-18 22:12:21.583: E/AndroidRuntime(491): at java.lang.reflect.Method.invoke(Method.java:491) 
03-18 22:12:21.583: E/AndroidRuntime(491): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841) 
03-18 22:12:21.583: E/AndroidRuntime(491): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 
03-18 22:12:21.583: E/AndroidRuntime(491): at dalvik.system.NativeStart.main(Native Method) 
03-18 22:12:21.583: E/AndroidRuntime(491): Caused by: java.lang.ClassNotFoundException: com.JSON.JSONexActivity in loader dalvik.system.PathClassLoader[/data/app/com.JSON-2.apk] 
03-18 22:12:21.583: E/AndroidRuntime(491): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:251) 
03-18 22:12:21.583: E/AndroidRuntime(491): at java.lang.ClassLoader.loadClass(ClassLoader.java:540) 
03-18 22:12:21.583: E/AndroidRuntime(491): at java.lang.ClassLoader.loadClass(ClassLoader.java:500) 
03-18 22:12:21.583: E/AndroidRuntime(491): at android.app.Instrumentation.newActivity(Instrumentation.java:1022) 
03-18 22:12:21.583: E/AndroidRuntime(491): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1730) 
03-18 22:12:21.583: E/AndroidRuntime(491): ... 11 more 

Answer 1

あなたは明らかに、あなたのプロジェクトでcom.JSON.JSONexActivityという名前のクラスを持っていない、と何かがその活動を開始しようとしています。