不明NullPointerException

Question

Hy！

私は、エラーを見つけることができません。 エラーがbtlogin.setOnClickListener

ログインクラス

package android.skiptvad; 

public class Login extends Activity{ 
ProgressDialog pd = null; 
//final SharedPreferences settings = getSharedPreferences("pref", 0); 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.login); 
    final SharedPreferences settings = getSharedPreferences("pref", 0); 
    final EditText user = (EditText)findViewById(R.id.login_etuser); 
    final EditText pw = (EditText)findViewById(R.id.login_etpw); 
    Button btlogin = (Button)findViewById(R.id.login_btlog); 
    Button btnew = (Button)findViewById(R.id.login_btnew); 
    final CheckBox cb = (CheckBox)findViewById(R.id.login_cb); 

    if (settings.getString("user", "") != "") 
    { 
    user.setText(settings.getString("user", "")); 
    pw.setText(settings.getString("pw", "")); 
    } 



    btlogin.setOnClickListener(new OnClickListener() { 

    @Override 
    public void onClick(View v) { 

    if (!user.getText().toString().equals("") && !pw.getText().toString().equals("")) 
    { 
    pd.setCancelable(true); 
    pd = ProgressDialog.show(Login.this,"","Loading. Please wait...", true); 
    List<NameValuePair> params = new ArrayList<NameValuePair>(); 
        params.add(new BasicNameValuePair("username", user.getText().toString())); 
        params.add(new BasicNameValuePair("password", pw.getText().toString())); 
        Handler handler = new Handler(){ 
        @Override 
        public void handleMessage(Message msg) { 
        pd.cancel(); 
         if (msg.obj.toString()!= null) 
         { 
        JSONParse json = null; 
        try { 
     json = new JSONParse(msg.obj.toString()); 
     } catch (JSONException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
     } 
     String session = json.getsessionid(); 
     SharedPreferences.Editor editor = settings.edit(); 
         editor.putString("session_id", session); 
         editor.commit(); 
         finish(); 

         } 
         else 
         { 

         runOnUiThread(new Runnable() { 
     public void run() { 
     Toast toast ; 
       toast = Toast.makeText(getApplicationContext(), "error", 500); 
      toast.show(); 
     } 
     }); 
         } 
        } 
        }; 
    HttpConnection con = new HttpConnection(params, "http://surfkid.redio.de/login", handler); 
    Log.e("xxxcon", "ok"); 
    con.start(); 
    } 
    if (cb.isChecked()) 
    { 
    SharedPreferences.Editor editor = settings.edit(); 
         editor.putString("user", user.getText().toString()); 
         editor.putString("pw", pw.getText().toString()); 
         editor.commit(); 
    } 

    } 
    }); 
    btnew.setOnClickListener(new OnClickListener() { 

    @Override 
    public void onClick(View v) { 
    startActivityForResult(new Intent(Login.this, NewAccount.class), 1); 

    } 
    }); 
} 


} 

LogCatにする必要があります：私はそれが見えます...あなたは、キャンセルとしてそれを設定しようとすると、 'PD' はヌルだと思う

01-28 14:11:03.180: ERROR/AndroidRuntime(12132): FATAL EXCEPTION: main 
01-28 14:11:03.180: ERROR/AndroidRuntime(12132): java.lang.NullPointerException 
01-28 14:11:03.180: ERROR/AndroidRuntime(12132):  at android.skiptvad.Login$1.onClick(Login.java:71) 
01-28 14:11:03.180: ERROR/AndroidRuntime(12132):  at android.view.View.performClick(View.java:2461) 
01-28 14:11:03.180: ERROR/AndroidRuntime(12132):  at android.view.View$PerformClick.run(View.java:8888) 
01-28 14:11:03.180: ERROR/AndroidRuntime(12132):  at android.os.Handler.handleCallback(Handler.java:587) 
01-28 14:11:03.180: ERROR/AndroidRuntime(12132):  at android.os.Handler.dispatchMessage(Handler.java:92) 
01-28 14:11:03.180: ERROR/AndroidRuntime(12132):  at android.os.Looper.loop(Looper.java:123) 
01-28 14:11:03.180: ERROR/AndroidRuntime(12132):  at android.app.ActivityThread.main(ActivityThread.java:4627) 
01-28 14:11:03.180: ERROR/AndroidRuntime(12132):  at java.lang.reflect.Method.invokeNative(Native Method) 
01-28 14:11:03.180: ERROR/AndroidRuntime(12132):  at java.lang.reflect.Method.invoke(Method.java:521) 
01-28 14:11:03.180: ERROR/AndroidRuntime(12132):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858) 
01-28 14:11:03.180: ERROR/AndroidRuntime(12132):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
01-28 14:11:03.180: ERROR/AndroidRuntime(12132):  at dalvik.system.NativeStart.main(Native Method) 

Answer 1

あなたは次の行までそれを作りません...

pd.setCancelable(true); 
pd = ProgressDialog.show(Login.this,"","Loading. Please wait...", true); 

Answer 2

私は@Maと思いますおそらく正しいでしょう。これは、入力としてboolean cancelableを受け取るメソッドを使用しています

pd = ProgressDialog.show(Login.this,"","Loading. Please wait...", true, true); 

：ラインpd.setCancelable(true);を削除し、で次の行を置き換えます。ここでuはウルのコードGET例外WHR正確なラインを得ることができるので、documentation