如何在预建的应用程序上添加导航抽屉？

Question

I am new to android development. I have already built my app without navigation drawer. Now, I want to add navigation drawer which will be same across all activities in my app. Help me on this issue.

Answer 1

Assuming your original activities are extending 'AppCompatActivity', make base activity like following and extend your all other activities to 'BaseActivity'. BaseActivity layout will content DrawaerLayout and one framelayout. Inside BaseActivity ovveride setcontentview method and inflat your activity layout inside framelayout.

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>

Add drawer.xml in "menu" folder in your resources.

<?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>