局部变量可能尚未初始化

问题:

我有一个TimePicker,我想用它来保存long/string“minutes”的值,该值表示当前时间和时间选择器选择的时间之间的总分钟数。

例如:如果当前是7:30,用户选择8:30,则会将60分钟保存为分钟值。

我已经成功地实现了以下源代码(如下所示),但我遇到了一些错误:

"The local variable tp may not have been initialized"

使用下面评论中建议的方法——尽管我严格按照说明操作。

编译器问题:

Description Resource    Path    Location    Type
The local variable tp may not have been initialized AddEditDevice.java      line 119    Java Problem
The local variable tp may not have been initialized AddEditDevice.java      line 120    Java Problem

来源:

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.ViewGroup;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.FrameLayout;
import android.widget.TextView;
import android.widget.TimePicker;
import java.text.DecimalFormat;
import android.util.Log;
import java.util.Calendar;

public class AddEditDevice extends Activity {

     private long rowID; 
     private EditText nameEt;
     private EditText capEt;
     private EditText codeEt;
     private TimePicker timeEt;
     private TextView ssidTextView;
     Calendar cal = Calendar.getInstance();
     TimePicker tp;


      // @Override
       public void onCreate(Bundle savedInstanceState) 
       {
          super.onCreate(savedInstanceState); 
          setContentView(R.layout.add_country);
          WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
          WifiInfo info = wifi.getConnectionInfo();
          String ssidString = info.getSSID();

          if (ssidString.startsWith("\"") && ssidString.endsWith("\"")){
              ssidString = ssidString.substring(1, ssidString.length()-1);
 }

          //TextView ssidTextView = (TextView) findViewById(R.id.wifiSSID);
          ssidTextView = (TextView) findViewById(R.id.wifiSSID);
          ssidTextView.setText(ssidString); 

          nameEt = (EditText) findViewById(R.id.nameEdit);
          capEt = (EditText) findViewById(R.id.capEdit);
          codeEt = (EditText) findViewById(R.id.codeEdit);
          timeEt = (TimePicker) findViewById(R.id.timeEdit);






          Bundle extras = getIntent().getExtras(); 

          if (extras != null)
          {
             rowID = extras.getLong("row_id");
             nameEt.setText(extras.getString("name"));  
             capEt.setText(extras.getString("cap"));  
             codeEt.setText(extras.getString("code"));    
             String time = extras.getString("time");
             String[] parts = time.split(":");
             timeEt.setCurrentHour(Integer.valueOf(parts[0]));
             timeEt.setCurrentMinute(Integer.valueOf(parts[1]));
             timeEt.setIs24HourView(false);


          }

          Button saveButton =(Button) findViewById(R.id.saveBtn);
          saveButton.setOnClickListener(new OnClickListener() {

              public void onClick(View v) 
              {
                 if (nameEt.getText().length() != 0)
                 {
                    AsyncTask<Object, Object, Object> saveContactTask = 
                       new AsyncTask<Object, Object, Object>() 
                       {
                          @Override
                          protected Object doInBackground(Object... params) 
                          {
                             saveContact();
                             return null;
                          }

                          @Override
                          protected void onPostExecute(Object result) 
                          {
                             finish();
                          }
                       }; 

                    saveContactTask.execute((Object[]) null); 
                 }

                 else
                 {
                    AlertDialog.Builder alert = new AlertDialog.Builder(AddEditDevice.this);
                    alert.setTitle(R.string.errorTitle); 
                    alert.setMessage(R.string.errorMessage);
                    alert.setPositiveButton(R.string.errorButton, null); 
                    alert.show();
                 }
              } 
         });}


       public static void main(String[] args) {
           Calendar cal = Calendar.getInstance();
           TimePicker tp;
           cal.set(Calendar.HOUR_OF_DAY, tp.getCurrentHour());
           cal.set(Calendar.MINUTE, tp.getCurrentMinute());
           long minutes = (cal.getTimeInMillis() -
               Calendar.getInstance().getTimeInMillis()) / 1000 / 60;
       }



           private void saveContact() 
           {
              DatabaseConnector dbConnector = new DatabaseConnector(this);

              if (getIntent().getExtras() == null)
              {
//                Log.i("Test for Null", ""+dbConnector+" "+nameEt+" "+capEt+" "+timeEt+" "+codeEt+" "+ssidTextView);
                  dbConnector.insertContact(nameEt.getText().toString(),
                          capEt.getText().toString(),
                          timeEt.getCurrentHour().toString() + ":"
                              + timeEt.getCurrentMinute().toString(),
                          codeEt.getText().toString(),
                       ssidTextView.getText().toString());

              }
              else
              {
                 dbConnector.updateContact(rowID,
                         nameEt.getText().toString(),
                            capEt.getText().toString(),
                              timeEt.getCurrentHour().toString() + ":"
                                  + timeEt.getCurrentMinute().toString(),
                              codeEt.getText().toString(),
                              ssidTextView.getText().toString());
              }
           }
}