我只想将非活动类的数据更新为Mainactivty布局组件。在我的下面的场景中,当我尝试访问Mainactivity组件(settext)时,我总是得到nullpointer异常
我的MainActivty代码:
public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
(对于上面的类我有布局,包括一些textview和EditText组件)
我的非活动课(JFYI,当我收到任何新短信时,将触发以下课程)
public class IncomingSms extends BroadcastReceiver {
String Orgi_Phonenumber;
String Orgi_MessageText;
Activity activity;
@Override
public void onReceive(Context context, Intent intent) {
final Bundle bundle = intent.getExtras();
if (bundle != null) {
Log.i("MyMessage", "start reading message information");
Object[] smsobject = (Object[]) bundle.get("pdus");
for (int i = 0; i < smsobject.length; i++) {
SmsMessage CurrentMessage = SmsMessage.createFromPdu((byte[]) smsobject[i]);
Orgi_Phonenumber += CurrentMessage.getOriginatingAddress();
Orgi_MessageText += CurrentMessage.getDisplayMessageBody();
}
}
Log.i("MyMessage","start updating message info " );
changemessage();
}
public void changemessage()
{
TextView tv = (TextView) activity.findViewById(R.id.EtextPhone);
tv.setText(Orgi_Phonenumber);
}
}
来自上面的非活动类(IncomingSms),同时调用mainactivty布局组件
TextView tv = (TextView) activity.findViewById(R.id.EtextPhone);
我正在获得nullpointer异常。请帮助我只知道android上的基础知识