android sms空指针异常

Question

当发送一些字符串文本作为一个短信给其他模拟器时，Iam得到一个空指针异常。我有一个按钮，点击它会将textView中的文本作为一个短信发送给其他模拟器。

这里的TextView和Button类

public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.ticketprocess); 




     SecureMessagesActivity sma = new SecureMessagesActivity(); 

     message = sma.getMessageBody(); 
     tv= (TextView) findViewById(R.id.textView1); 
      tv.setText(message); 



     submit = (Button) findViewById(R.id.button1); 
     submit.setOnClickListener(new OnClickListener() { 
public void onClick(View v) { 

    SendSms sms = new SendSms(); 
    sms.sendSMS("15555215556", message); 

}}); 

    } 

的代码，这里是sendsms类上点击按钮设备代码

public class SendSms extends Activity { 

    public 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(){ 
      @SuppressWarnings("deprecation") 
      @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);   
    } 

} 

现在得到强制关闭的消息，在错误logcat是

06-14 17:47:47.249: ERROR/AndroidRuntime(8403): FATAL EXCEPTION: main 
06-14 17:47:47.249: ERROR/AndroidRuntime(8403): java.lang.NullPointerException 
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):  at android.content.ContextWrapper.getPackageName(ContextWrapper.java:120) 
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):  at android.app.PendingIntent.getBroadcast(PendingIntent.java:226) 
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):  at com.mypackage.ULWAFMS1.SendSms.sendSMS(SendSms.java:38) 
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):  at com.mypackage.ULWAFMS1.page1$1.onClick(page1.java:43) 
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):  at android.view.View.performClick(View.java:2408) 
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):  at android.view.View$PerformClick.run(View.java:8816) 
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):  at android.os.Handler.handleCallback(Handler.java:587) 
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):  at android.os.Handler.dispatchMessage(Handler.java:92) 
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):  at android.os.Looper.loop(Looper.java:123) 
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):  at android.app.ActivityThread.main(ActivityThread.java:4627) 
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):  at java.lang.reflect.Method.invokeNative(Native Method) 
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):  at java.lang.reflect.Method.invoke(Method.java:521) 
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
06-14 17:47:47.249: ERROR/AndroidRuntime(8403):  at dalvik.system.NativeStart.main(Native Method) 

Answer 1

问题发生在你正在创建你的地方sendSms方法开始时的对象。你正在实施SendSMS作为一项活动，但我认为它不是必须的，并且它没有被正确初始化为一个活动，所以你看到了这个失败。

拿出从sendsms类extends Activity，并改变你的sendSms方法来启动如下：

public class SendSms { 

    public void sendSMS(Context context, String phoneNumber, String message) 
    {   
     String SENT = "SMS_SENT"; 
     String DELIVERED = "SMS_DELIVERED"; 

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

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

现在，你需要把它从你的onClickListener调用为sendSms(this, "15555215556", message);;