java - Android短信空指针异常

我在将一些字符串文本作为短信发送给其他模拟器时遇到了空指针异常。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, 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，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)

最佳答案

当您在PendingIntent方法开始时创建sendSms对象时，就会出现问题。您正在将SendSMS实施为活动，但是我认为它不是必需的，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extends Activity，然后将sendSms方法更改为以如下方式启动：

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);

现在您需要在sendSms( this, "15555215556", message );中将其称为onClickListener；