R無法在聲明後解析爲變量

Question

我已經將R聲明爲變量。但是，錯誤仍然存​​在。我清理了這個項目並重啓了它，但沒有任何改變。我是一個初學者，以消除android編碼。有人可以幫助我與R變量？

Main.java

package com.example.smsmessaging; 
import com.example.smsmessaging.R; 
import android.app.Activity; 
import android.app.PendingIntent; 
import android.content.BroadcastReceiver; 
import android.content.Context; 
import android.content.Intent; 
import android.content.IntentFilter; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.Toast; 
import android.telephony.gsm.SmsManager; 


public class SMS extends Activity 
{ 

Button btnSendSMS; 
EditText txtPhoneNo; 
EditText txtMessage; 


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

    btnSendSMS = (Button) findViewById(R.id.btnSendSMS); 
    txtPhoneNo = (EditText) findViewById(R.id.txtPhoneNo); 
    txtMessage = (EditText) findViewById(R.id.txtMessage); 

    btnSendSMS.setOnClickListener(new View.OnClickListener() 
    { 
     public void onClick(View v) 
     {     
      String phoneNo = txtPhoneNo.getText().toString(); 
      String message = txtMessage.getText().toString();     
      if (phoneNo.length()>0 && message.length()>0)     
       sendSMS(phoneNo, message);     
      else 
       Toast.makeText(getBaseContext(), 
        "Please enter both phone number and message.", 
        Toast.LENGTH_SHORT).show(); 
     } 
    });   
}  
public class SMS extends Activity 
{ 
    //... 

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

    //---sends an SMS message to another device--- 
    private void sendSMS(String phoneNumber, String message) 
    {   
     PendingIntent pi = PendingIntent.getActivity(this, 0, 
      new Intent(this, SMS.class), 0);     
     SmsManager sms = SmsManager.getDefault(); 
     sms.sendTextMessage(phoneNumber, null, message, pi, null);   
    }  
    } 
    //---sends an SMS message to another device--- 
    private void sendSMS(String phoneNumber, String message) 
    {   
    String SENT = "SMS_SENT"; 
    String DELIVERED = "SMS_DELIVERED"; 

    PendingIntent sentPI = PendingIntent.getBroadcast(this, 0, 
     new Intent(SENT), 0); 

    PendingIntent deliveredPI = PendingIntent.getBroadcast(this, 0, 
     new Intent(DELIVERED), 0); 

    //---when the SMS has been sent--- 
    registerReceiver(new BroadcastReceiver(){ 
     @Override 
     public void onReceive(Context arg0, Intent arg1) { 
      switch (getResultCode()) 
      { 
       case Activity.RESULT_OK: 
        Toast.makeText(getBaseContext(), "SMS sent", 
          Toast.LENGTH_SHORT).show(); 
        break; 
       case SmsManager.RESULT_ERROR_GENERIC_FAILURE: 
        Toast.makeText(getBaseContext(), "Generic failure", 
          Toast.LENGTH_SHORT).show(); 
        break; 
       case SmsManager.RESULT_ERROR_NO_SERVICE: 
        Toast.makeText(getBaseContext(), "No service", 
          Toast.LENGTH_SHORT).show(); 
        break; 
       case SmsManager.RESULT_ERROR_NULL_PDU: 
        Toast.makeText(getBaseContext(), "Null PDU", 
          Toast.LENGTH_SHORT).show(); 
        break; 
       case SmsManager.RESULT_ERROR_RADIO_OFF: 
        Toast.makeText(getBaseContext(), "Radio off", 
          Toast.LENGTH_SHORT).show(); 
        break; 
      } 
     } 
    }, new IntentFilter(SENT)); 

    //---when the SMS has been delivered--- 
    registerReceiver(new BroadcastReceiver(){ 
     @Override 
     public void onReceive(Context arg0, Intent arg1) { 
      switch (getResultCode()) 
      { 
       case Activity.RESULT_OK: 
        Toast.makeText(getBaseContext(), "SMS delivered", 
          Toast.LENGTH_SHORT).show(); 
        break; 
       case Activity.RESULT_CANCELED: 
        Toast.makeText(getBaseContext(), "SMS not delivered", 
          Toast.LENGTH_SHORT).show(); 
        break;       
      } 
     } 
    }, new IntentFilter(DELIVERED));   

    SmsManager sms = SmsManager.getDefault(); 
    sms.sendTextMessage(phoneNumber, null, message, sentPI, deliveredPI);   
    } 

XML：

<receiver android:name=".SmsReceiver"> 
     <intent-filter> 
      <action android:name= 
       "android.provider.Telephony.SMS_RECEIVED" /> 
     </intent-filter> 
    </receiver> 

</application> 
<uses-permission android:name="android.permission.SEND_SMS"> 
</uses-permission> 
<uses-permission android:name="android.permission.RECEIVE_SMS"> 
</uses-permission> 
</manifest> 

Answer 1

一旦檢查進口並在代碼中刪除未使用的導入：
此行：import com.example.smsmessaging.R;
再組織進口 - >按Ctrl +移+Ø

完蛋了......

Answer 2

刪除線進口com.example.smsmessaging.R;我們不應該在我們的.java中導入它。

Answer 3

首先刪除遊覽R.java文件格式gen文件夾。現在清理你的項目並導入android.R;

替代進口可以通過按Ctrl + Shift + O

Answer 4

你不應該導入R或將它定義爲一個變量來實現。 從http://source.android.com/source/using-eclipse.html報價：

注：Eclipse中有時喜歡在你的文件的頂部添加一個導入android.R聲明>是利用資源，尤其是當你問蝕進行排序或管理進口。 >這會導致你的製造中斷。注意這些錯誤的導入語句並刪除它們。

如果您的資源xml文件中沒有錯誤，則R應自動可用。 XML問題通常在Eclipse中報告。如果您無法找出錯誤，請在此處發佈您的xml文件。