我目前正在創建一個不使用片段的導航菜單。我似乎創建了一個工作系統,它打開類,並通過使用BaseActivity
並將它繼承到需要抽屜的類中,從而使導航欄保持在每個階段。然而,在加載應用程序時,看起來3杆'漢堡'圖標不存在,頂部的工具欄也不存在(見圖)。導航欄似乎有用,因爲我可以從左側滑動並點擊加載其他課程。我覺得我的onCreate()
在我的BaseActivity
是缺少的東西,但用谷歌搜索我似乎無法找到解決方案。抽屜佈局漢堡包和工具欄不可見,儘管工作導航抽屜?
圖片當前問題:導航欄的
圖像的問題,在後臺工作:
這是我的基本活動:
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.NavigationView;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.MenuItem;
public class BaseActivity extends AppCompatActivity {
DrawerLayout drawerLayout;
ActionBarDrawerToggle actionBarDrawerToggle;
Toolbar toolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
NavigationView navigationView = (NavigationView) findViewById(R.id.navigation_view);
drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
actionBarDrawerToggle = new ActionBarDrawerToggle(this, drawerLayout, toolbar, R.string.drawer_open, R.string.drawer_closed);
drawerLayout.addDrawerListener(actionBarDrawerToggle);
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(MenuItem item) {
Intent anIntent;
switch (item.getItemId()) {
case R.id.nav_homepage:
anIntent = new Intent(getApplicationContext(), homepage.class);
startActivity(anIntent);
drawerLayout.closeDrawers();
break;
case R.id.nav_add_roster:
anIntent = new Intent(getApplicationContext(), add_roster.class);
startActivity(anIntent);
drawerLayout.closeDrawers();
break;
case R.id.nav_check_schedule:
anIntent = new Intent(getApplicationContext(), schedule.class);
startActivity(anIntent);
drawerLayout.closeDrawers();
break;
}
return false;
}
});
}
}
這是我的homepag Ë這就是最初加載:
import android.os.Bundle;
import android.widget.FrameLayout;
public class homepage extends BaseActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FrameLayout contentFrameLayout = (FrameLayout) findViewById(R.id.content_frame); //Remember this is the FrameLayout area within your content_main.xml
getLayoutInflater().inflate(R.layout.homepage, contentFrameLayout);
}
}
這裏是我的活動主:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/content_frame"/>
</LinearLayout>
<android.support.design.widget.NavigationView
android:id="@+id/navigation_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:headerLayout="@layout/nav_header_main"
app:menu="@menu/activity_main_drawer" />
</android.support.v4.widget.DrawerLayout>
試過這個在我的谷歌搜索,沒有運氣恐怕 –
看看我的編輯是否幫助你。 – Cochi
Nada,強制關閉空指針。我正在使用NoActionBar主題,所以這可能是原因... java.lang.NullPointerException:嘗試調用虛擬方法'void android.support.v7.app.ActionBar.setHomeButtonEnabled(boolean)'on a null對象引用 –