如何在预建应用程序上添加导航抽屉？

Question

我是android开发新手。我已经建立了我的应用程序，无需导航抽屉。现在，我想添加导航抽屉，它将在我的应用中的所有活动中保持一致。在这个问题上帮助我。

Answer 1

假设您的原始活动扩展了'AppCompatActivity'，请将基本活动设置为如下并将其他所有活动扩展到'BaseActivity'。 BaseActivity布局将内容DrawaerLayout和一个framelayout。在BaseActivity中，使用setContentview方法，并在framelayout中填充活动布局。

BaseActivity.Java

public class BaseActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener { 


    private FrameLayout baseLayout; 
    public ActionBarDrawerToggle drawerToggle; 
    public Toolbar toolbar; 

    @Override 
    protected void onCreate(@Nullable Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     super.setContentView(R.layout.base_layout); 
     toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 
     baseLayout = (FrameLayout) findViewById(R.id.base_view); 
     NavigationView navigationView = (NavigationView) findViewById(R.id.navigation_view); 
     DrawerLayout drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); 
     navigationView.setNavigationItemSelectedListener(this); 
     drawerToggle = new ActionBarDrawerToggle(this, drawerLayout, toolbar, 0, 0); 
     drawerLayout.addDrawerListener(drawerToggle); 
    } 

    @Override 
    public void setContentView(View view) { 
     if (baseLayout != null) { 
      ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(
        ViewGroup.LayoutParams.MATCH_PARENT, 
        ViewGroup.LayoutParams.MATCH_PARENT); 
      baseLayout.addView(view, params); 
     } 
    } 

    @Override 
    public void setContentView(View view, ViewGroup.LayoutParams params) { 
     if (baseLayout != null) { 
      baseLayout.addView(view, params); 
     } 
    } 

    @Override 
    public boolean onNavigationItemSelected(@NonNull MenuItem item) { 
     //TODO 
     return false; 
    } 
} 

base_layout.xml

<?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"> 

     <android.support.design.widget.AppBarLayout 
      style="@style/Widget.MyApp.Toolbar.Solid" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
    > 

      <android.support.v7.widget.Toolbar 
       android:id="@+id/toolbar" 
       android:layout_width="match_parent" 
       android:layout_height="?attr/actionBarSize" 
       android:background="?attr/colorPrimary"> 


      </android.support.v7.widget.Toolbar> 



     </android.support.design.widget.AppBarLayout> 

     <FrameLayout 
      android:id="@+id/base_view" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" /> 
    </LinearLayout> 

    <android.support.design.widget.NavigationView 
     android:id="@+id/navigation_view" 
     android:layout_width="280sp" 
     android:layout_height="match_parent" 
     android:layout_gravity="start" 
     android:fitsSystemWindows="true" 
     app:headerLayout="@layout/base_header" 
     app:menu="@menu/drawer" /> 
</android.support.v4.widget.DrawerLayout> 

base_header.xml

<?xml version="1.0" encoding="utf-8"?> 
<android.support.constraint.ConstraintLayout 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" 
    android:background="@drawable/blank" 
    android:orientation="vertical"> 

    <ImageView 
     android:id="@+id/nav_header_icon" 
     android:layout_width="50sp" 
     android:layout_height="50sp" 
     android:layout_marginBottom="8dp" 
     android:layout_marginStart="16sp" 
     android:contentDescription="@null" 
     android:src="@mipmap/ic_launcher" 
     app:layout_constraintBottom_toTopOf="@+id/nav_header_title" 
     app:layout_constraintStart_toStartOf="parent" /> 

    <TextView 
     android:id="@+id/nav_header_title" 
     android:layout_width="0dp" 
     android:layout_height="wrap_content" 
     android:layout_marginEnd="16sp" 
     android:layout_marginStart="16sp" 
     android:fontFamily="sans-serif-medium" 
     android:text="@string/app_name" 
     app:layout_constraintBottom_toTopOf="@+id/nav_header_subtitle" 
     app:layout_constraintEnd_toEndOf="parent" 
     app:layout_constraintStart_toStartOf="parent" /> 

    <TextView 
     android:id="@+id/nav_header_subtitle" 
     android:layout_width="0dp" 
     android:layout_height="wrap_content" 
     android:layout_marginBottom="8dp" 
     android:layout_marginEnd="16sp" 
     android:layout_marginStart="16sp" 
     android:fontFamily="sans-serif" 
     android:text="@string/app_name" 
     app:layout_constraintBottom_toBottomOf="parent" 
     app:layout_constraintEnd_toEndOf="parent" 
     app:layout_constraintStart_toStartOf="parent" /> 
</android.support.constraint.ConstraintLayout> 

在 “菜单中的” 添加文件夹drawer.xml在你的资源。

<?xml version="1.0" encoding="utf-8"?> 
<menu xmlns:android="http://schemas.android.com/apk/res/android" 
    android:checkableBehavior="single"> 
    <item 
     android:id="@+id/nav_home" 
     android:icon="@drawable/icon_home" 
     android:title="Home" /> 


</menu>