클릭 메서드에서 내 코드에서 Null Pointer Exception이 발생합니다. 어떻게 제거 할 수 있는지 제안 해주십시오.nullPointerException을 제거하려면 어떻게해야합니까
package co.sds.iitr.bullsandcows;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener
{
EditText Num;
Button done;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Num = (EditText) findViewById(R.id.etNum);
done = (Button) findViewById(R.id.btDone);
done.setOnClickListener(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public void onClick(View v)
{
// TODO Auto-generated method stub
if(v.getId()== R.id.btDone)
{
String num = Num.getText().toString();
int n = Integer.getInteger(num);
Toast.makeText(getApplicationContext(),"Your number is saved",
Toast.LENGTH_LONG).show();
Intent i = new Intent(getApplicationContext(),GuessActivtiy.class);
i.putExtra("num", n);
startActivity(i);
}
else
Toast.makeText(getApplicationContext(),"Not Found",
Toast.LENGTH_LONG).show();
}
}
GussActivity는 내 값을 의도를 통해 전달하려고 시도하는 다른 활동 클래스입니다. 로그 고양이가 이렇게 생겼습니다.
03-02 02:01:22.080: D/gralloc_goldfish(901): Emulator without GPU emulation detected.
03-02 02:01:27.570: D/AndroidRuntime(901): Shutting down VM
03-02 02:01:27.570: W/dalvikvm(901): threadid=1: thread exiting with uncaught exception (group=0xb3aaeba8)
03-02 02:01:27.650: E/AndroidRuntime(901): FATAL EXCEPTION: main
03-02 02:01:27.650: E/AndroidRuntime(901): Process: co.sds.iitr.bullsandcows, PID: 901
03-02 02:01:27.650: E/AndroidRuntime(901): java.lang.NullPointerException
03-02 02:01:27.650: E/AndroidRuntime(901): at co.sds.iitr.bullsandcows.MainActivity.onClick(MainActivity.java:45)
03-02 02:01:27.650: E/AndroidRuntime(901): at android.view.View.performClick(View.java:4438)
03-02 02:01:27.650: E/AndroidRuntime(901): at android.view.View$PerformClick.run(View.java:18422)
03-02 02:01:27.650: E/AndroidRuntime(901): at android.os.Handler.handleCallback(Handler.java:733)
03-02 02:01:27.650: E/AndroidRuntime(901): at android.os.Handler.dispatchMessage(Handler.java:95)
03-02 02:01:27.650: E/AndroidRuntime(901): at android.os.Looper.loop(Looper.java:136)
03-02 02:01:27.650: E/AndroidRuntime(901): at android.app.ActivityThread.main(ActivityThread.java:5017)
03-02 02:01:27.650: E/AndroidRuntime(901): at java.lang.reflect.Method.invokeNative(Native Method)
03-02 02:01:27.650: E/AndroidRuntime(901): at java.lang.reflect.Method.invoke(Method.java:515)
03-02 02:01:27.650: E/AndroidRuntime(901): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
03-02 02:01:27.650: E/AndroidRuntime(901): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
03-02 02:01:27.650: E/AndroidRuntime(901): at dalvik.system.NativeStart.main(Native Method)
이 문제를 해결하는 데 도움을주십시오.
로보기는'INT N =있는 Integer.parseInt (NUM)를 사용하는 경우는 null – archie
시도이다. 45 번 라인에서 NPE를 얻는 곳. –
45 번 라인은 어느 것입니까? – home