Androidアプリの例外

Question

私はこのコードを持っている：

@Override 
    protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_log_reg); 

    pw=(ProgressBar) findViewById(R.id.wait); 
    pw.setVisibility(View.GONE); 


    SharedPreferences settings = getSharedPreferences(info.PREFS_NAME, 0); 
    boolean current_status = settings.getBoolean("status",false); 

    String saved_phone; 
    String saved_password; 
    if(current_status){ 
     saved_phone = settings.getString("phone",""); 
     saved_password = settings.getString("password",""); 
     SyncTask syncTask = new SyncTask(this,"L"); 
     syncTask.execute("LOGIN", "", "", "", "", saved_phone,saved_password); 
    } 

アプリが常にcrushs、私は

SharedPreferences settings = getSharedPreferences(info.PREFS_NAME, 0); 
     boolean current_status = settings.getBoolean("status",false); 

     String saved_phone; 
     String saved_password; 
     if(current_status){ 
      saved_phone = settings.getString("phone",""); 
      saved_password = settings.getString("password",""); 
      SyncTask syncTask = new SyncTask(this,"L"); 
      syncTask.execute("LOGIN", "", "", "", "", saved_phone,saved_password); 

を削除すると、それはcrushsなぜSyncTaskクラスが動作するので、私はそれを呼び出すときに、私は、理解することができますが他のクラスから。私はデバッガの問題を解決しようとしましたが、それは私を助けることはできません。 それは私のログです：

06-24 10:28:13.226 8479-8479/com.myapp E/AndroidRuntime: FATAL EXCEPTION: main 
                 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.myapp/com.myapp.LogReg}: java.lang.NullPointerException 
                  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059) 
                  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 
                  at android.app.ActivityThread.access$600(ActivityThread.java:130) 
                  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 
                  at android.os.Handler.dispatchMessage(Handler.java:99) 
                  at android.os.Looper.loop(Looper.java:137) 
                  at android.app.ActivityThread.main(ActivityThread.java:4745) 
                  at java.lang.reflect.Method.invokeNative(Native Method) 
                  at java.lang.reflect.Method.invoke(Method.java:511) 
                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
                  at dalvik.system.NativeStart.main(Native Method) 
                  Caused by: java.lang.NullPointerException 
                  at com.myapp.SyncTask.onPreExecute(SyncTask.java:38) 
                  at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586) 
                  at android.os.AsyncTask.execute(AsyncTask.java:534) 
                  at com.myapp.LogReg.onCreate(LogReg.java:41) 
                  at android.app.Activity.performCreate(Activity.java:5008) 
                  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 
                  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) 
                  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)  
                  at android.app.ActivityThread.access$600(ActivityThread.java:130)  
                  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)  
                  at android.os.Handler.dispatchMessage(Handler.java:99)  
                  at android.os.Looper.loop(Looper.java:137)  
                  at android.app.ActivityThread.main(ActivityThread.java:4745)  
                  at java.lang.reflect.Method.invokeNative(Native Method)  
                  at java.lang.reflect.Method.invoke(Method.java:511)  
                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)  
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)  
                  at dalvik.system.NativeStart.main(Native Method)  

これは私のSyncTaskです：

public class SyncTask extends AsyncTask<String,Void,String> { 
    Context ctx; 
    String type; 
    AlertDialog alertDialog; 
    static String info="",name="",surname=""; 
    private static final String TAG = "myLogs"; 
    SyncTask(Context ctx, String type) { 
     this.ctx = ctx; 
     this.type = type; 
    } 

    @Override 
    protected void onPreExecute() { 
     if (type.equals("L")) { 
      Login.pw.setVisibility(View.VISIBLE); 
      Login.ent.setClickable(false); 

     } 

    } 


    @Override 
    protected String doInBackground(String... params) { 

     String URL_REG = "http://androidsqltest.netau.net/reg.php"; 
     String URL_LOGIN = "http://androidsqltest.netau.net/login.php"; 
     if (params[0].equals("REGISTRATION")) { 
      try { 

       URL url = new URL(URL_REG); 
       HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection(); 
       httpURLConnection.setRequestMethod("POST"); 
       httpURLConnection.setDoOutput(true); 
       OutputStream OS = httpURLConnection.getOutputStream(); 
       BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(OS, "UTF-8")); 
       String data = URLEncoder.encode("name", "UTF-8") + "=" + URLEncoder.encode(params[1], "UTF-8") + "&" + 
         URLEncoder.encode("surname", "UTF-8") + "=" + URLEncoder.encode(params[2], "UTF-8") + "&" + 
         URLEncoder.encode("phone", "UTF-8") + "=" + URLEncoder.encode(params[3], "UTF-8") + "&" + 
         URLEncoder.encode("password", "UTF-8") + "=" + URLEncoder.encode(params[4], "UTF-8"); 
       bufferedWriter.write(data); 
       bufferedWriter.flush(); 
       bufferedWriter.close(); 
       OS.close(); 
       InputStream IS = httpURLConnection.getInputStream(); 
       IS.close(); 
       return "Գրանցումը հաջողությամբ ավարտվել է"; 

      } catch (MalformedURLException e) { 
       e.printStackTrace(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 
     } 
     if (params[0].equals("LOGIN")) { 
      try { 

       URL url = new URL(URL_LOGIN); 
       HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection(); 
       httpURLConnection.setRequestMethod("POST"); 
       httpURLConnection.setDoInput(true); 
       httpURLConnection.setDoOutput(true); 
       OutputStream OS = httpURLConnection.getOutputStream(); 
       BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(OS, "UTF-8")); 
       String data = URLEncoder.encode("cphone", "UTF-8") + "=" + URLEncoder.encode(params[5], "UTF-8") + "&" + 
         URLEncoder.encode("cpassword", "UTF-8") + "=" + URLEncoder.encode(params[6], "UTF-8"); 
       bufferedWriter.write(data); 
       bufferedWriter.flush(); 
       bufferedWriter.close(); 
       OS.close(); 
       InputStream IS = httpURLConnection.getInputStream(); 
       BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(IS, "UTF-8")); 
       String response = ""; 
       String line = ""; 
       while ((line = bufferedReader.readLine()) != null) { 
        response += line; 

       } 
       bufferedReader.close(); 
       IS.close(); 
       info = response; 
       return info; 


      } catch (MalformedURLException e) { 
       e.printStackTrace(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 


     } 
     return "Ստուգեք ինտերնետ կապի առկայությունը"; 
    } 


    @Override 
    protected void onProgressUpdate(Void... values) { 

     super.onProgressUpdate(values); 
    } 

    @Override 
    protected void onPostExecute(String result) { 


     if (result.equals("Գրանցումը հաջողությամբ ավարտվել է")) { 
      Toast.makeText(ctx, result, Toast.LENGTH_LONG).show(); 
      LogReg.pw.setVisibility(View.GONE); 
     } else { 

      Login.ent.setClickable(true); 
      if (info.equals("Համակարգում այդպիսի տվյալներով գրանցում չկա, փորձեք կրկին ")) { 

        alertDialog = new AlertDialog.Builder(ctx).create(); 
        alertDialog.setTitle("Մուտք համակարգ"); 
        Login.pw.setVisibility(View.GONE); 
        alertDialog.setMessage(info); 
        alertDialog.show(); 

      } else { 
        String temp = info; 
       int s; 
         for(int i =0;;i++){ 
          if (temp.charAt(i)==' '){ 

           s=i; 
           break; 

          } 
          name+=temp.charAt(i); 

         } 
       for(int i = s+1;i<(temp.length()-1);i++) 
       { 
       surname+=temp.charAt(i); 

       } 

       Log.d(TAG, info); 
       ctx.startActivity(new Intent(ctx, info.class)); 
      } 
     } 
    } 
} 

Answer 1

あなたはSyncTaskインスタンスがアプリがあれば（CURRENT_STATUS）{}ブロックの外に出た後に削除されるローカル変数であり、そのよう参照はnullです。 活動のメンバ変数