-1
android studio 2.2에서 작업 중이며 탐색 서랍 작업을 사용했습니다. 코드에서 nav_header_layout의 텍스트를 변경하고 싶습니다만, 코드에서 findViewById를 사용하여 nav_header_layout에있는 TextView를 인덱싱하면 null이 반환됩니다. 그것을 고칠 방법이 있습니까?텍스트보기 return null
여기
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="@dimen/nav_header_height"
xmlns:tools="http://schemas.android.com/tools"
android:background="@drawable/side_nav_bar"
android:gravity="bottom"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.nexmo.sdk.sample.verifysample.Dashboard"
android:theme="@style/ThemeOverlay.AppCompat.Dark">
<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="@dimen/nav_header_vertical_spacing"
app:srcCompat="@android:drawable/sym_def_app_icon" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="@dimen/nav_header_vertical_spacing"
android:text="Android"
android:textAppearance="@style/TextAppearance.AppCompat.Body1" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/nav_number"/>
</LinearLayout>
자바 코드
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dashboard);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
TextView textv=(TextView)findViewById (R.id.nav_number);
textv.setText("new string");
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
위의 XML이 'activity_dashboard.xml'입니까? – codeMagic
코드 문제가 보이지 않습니다 ... 올바른 레이아웃인지 아닌지 확인하십시오. setContentView (R.layout.activity_dashboard –
) ViewPager, tablayout은 어디입니까? –