바텀 내비게이션바에 프레그먼트로 화면전환 만들었습니다.
그런데 리스트뷰를 넣어서 세팅해봤는데 에러가 발생합니다.
어떻게 해야하나요?
밑에 코드랑 로그캣 첨부했습니다.
package com.example.hs.meet;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
public class BottomNavigation extends AppCompatActivity {
private BottomNavigationView navigation;
private ViewPager viewPager;
private ViewPagerAdapter adapter;
private MenuItem prevMenuItem;
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.navigation_home:
viewPager.setCurrentItem(0);
return true;
case R.id.navigation_dashboard:
viewPager.setCurrentItem(1);
return true;
case R.id.navigation_notifications:
viewPager.setCurrentItem(2);
return true;
case R.id.navigation_mypage:
viewPager.setCurrentItem(3);
return true;
}
return false;
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (ViewPager) findViewById(R.id.viewpager_id);
navigation = (BottomNavigationView) findViewById(R.id.bottom_navigation);
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.AddFragment(new Fragment1(), "frag1");
adapter.AddFragment(new Fragment2(),"frag2");
adapter.AddFragment(new Fragment3(), "frag3");
adapter.AddFragment(new Fragment4(), "frag3");
viewPager.setAdapter(adapter);
String[] fillterListItem = getResources().getStringArray(R.array.fillterListItem);
ArrayAdapter fillterAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1,fillterListItem);
ListView fillterList = findViewById(R.id.fillter_List);
fillterList.setAdapter(fillterAdapter);
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
if (prevMenuItem != null) {
prevMenuItem.setChecked(false);
}
else
{
navigation.getMenu().getItem(0).setChecked(false);
}
navigation.getMenu().getItem(position).setChecked(true);
prevMenuItem = navigation.getMenu().getItem(position);
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
}
09-09 04:26:28.802 31491-31491/? E/Zygote: v2
09-09 04:26:28.812 31491-31491/? E/SELinux: [DEBUG] get_category: variable seinfo: default sensitivity: NULL, cateogry: NULL
09-09 04:26:29.792 31491-31491/com.example.hs.meet E/com.example.hs.meet: listview is null!
09-09 04:26:29.792 31491-31491/com.example.hs.meet E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.hs.meet, PID: 31491
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.hs.meet/com.example.hs.meet.BottomNavigation}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2699)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2773)
at android.app.ActivityThread.access$900(ActivityThread.java:177)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1434)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5930)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference
at com.example.hs.meet.BottomNavigation.onCreate(BottomNavigation.java:77)
at android.app.Activity.performCreate(Activity.java:6178)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2652)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2773)
at android.app.ActivityThread.access$900(ActivityThread.java:177)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1434)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5930)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200)
