android sms空指针异常

如何解决android sms空指针异常

| 我在将一些字符串文本作为短信发送到其他模拟器时收到空指针异常。我有一个按钮，单击该按钮会将文本视图中的文本作为短信发送给其他模拟器。 这是textview和button类的代码

    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);

}});

  }

这是sendsms类的代码

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,new Intent(SENT),0);

        PendingIntent deliveredPI = PendingIntent.getBroadcast(this,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,\"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，单击按钮后，设备将显示强制关闭消息，logcat中的错误为

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)

    

解决方法

        在您以

sendSms

方法开始时创建

PendingIntent

对象的地方发生了问题。您正在将SendSMS实施为活动，但我认为并不一定要这样做，并且未正确将其初始化为活动，因此您会看到此失败。 从sendms类中取出ѭ5，并更改sendSms方法以使其开始，如下所示：

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,new Intent(SENT),0);

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

现在，您需要从

onClickListener

中将其称为

sendSms( this,\"15555215556\",message );

；