如何将导航抽屉添加到多个活动

Question

我有一个应用程序，通过查看 android studio 为您提供的示例，我在其中添加了Navigation Drawer 。 但是现在我想将抽屉添加到其他活动中。 为了尝试这样做，我使用 Android Studio 为您提供的Navigation Drawer Activity了一个新项目。 我发现实现这一点的最简单方法是创建一个BaseActivity并扩展我所有需要来自BaseActivity的Navigation Drawer其他活动 这是我的一些代码。

基本活动.java

package com.example.eddie.drawerapp2;
//I did not include the imports to make this shorter

public class BaseActivity extends AppCompatActivity implements
    NavigationView.OnNavigationItemSelectedListener
{
protected FrameLayout frameLayout;
private DrawerLayout drawer;
private NavigationView navView;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.base_activity);


    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    android.support.v7.app.ActionBarDrawerToggle toggle = new android.support.v7.app.ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
    drawer.addDrawerListener(toggle);
    toggle.syncState();

    frameLayout = (FrameLayout)findViewById(R.id.content_frame);
    drawer = (DrawerLayout)findViewById(R.id.drawer_layout);
    navView = (NavigationView)findViewById(R.id.nav_view);

    navView.setNavigationItemSelectedListener(this);


}

@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
// Handle navigation view item clicks here.
    int id = item.getItemId();

    if (id == R.id.nav_camera) {
        // Handle the camera action
    } else if (id == R.id.nav_gallery) {

    } else if (id == R.id.nav_slideshow) {

    } else if (id == R.id.nav_manage) {

    } else if (id == R.id.nav_share) {

    } else if (id == R.id.nav_send) {

    }

    drawer.closeDrawer(GravityCompat.START);
    return true;
}
}

activity_base.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">

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

<android.support.design.widget.NavigationView
     android:id="@+id/nav_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>

当我转到activity_base.xml并将其更改为设计视图时，它看起来不错。

主活动.java

package com.example.eddie.drawerapp2;

//skip imports

public class MainActivity extends BaseActivity{

    private DrawerLayout drawer;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        LayoutInflater inflater = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        //inflate your activity layout here!
        drawer = (findViewById(R.id.drawer_layout));
        View contentView = inflater.inflate(R.layout.activity_main, null, false);
        drawer.addView(contentView, 0);

    }
}

活动_main.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">

        <include
            layout="@layout/app_bar_main"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

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

    </android.support.v4.widget.DrawerLayout>

app_bar_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.eddie.drawerapp2.MainActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

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

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

    <include layout="@layout/content_main" />

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

content_main.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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="com.example.eddie.drawerapp2.MainActivity"
    tools:showIn="@layout/app_bar_main">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

activity_main.xml和MainActivity.java有逻辑错误。 它只显示内容和一个空白的工具栏。 滑动打开NavigationDrawer也没有任何作用。 我真的不知道该怎么办，这只是我的尝试。 请帮助我，我真的被困住了。 我需要做什么才能将NavigationDrawer添加到MainActivity而不是其他活动？

Answer 1

我以前做过这个，我认为你的 BaseActivity.java 代码中缺少的是覆盖 setContentView 方法，以便内容视图可以设置到框架布局中，从而创建其他活动的行为，例如子类。

1.BaseActivity.java

package com.example.eddie.drawerapp2;
//I did not include the imports to make this shorter

public class BaseActivity extends AppCompatActivity implements
    NavigationView.OnNavigationItemSelectedListener
{
protected FrameLayout frameLayout;
private DrawerLayout drawer;
private NavigationView navView;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.base_activity);


    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    android.support.v7.app.ActionBarDrawerToggle toggle = new android.support.v7.app.ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
    drawer.addDrawerListener(toggle);
    toggle.syncState();

    frameLayout = (FrameLayout)findViewById(R.id.content_frame);
    drawer = (DrawerLayout)findViewById(R.id.drawer_layout);
    navView = (NavigationView)findViewById(R.id.nav_view);

    navView.setNavigationItemSelectedListener(this);


}

     /* Overriding all setContentView methods to put the content view to the FrameLayout frameLayout
  * so that, we can make other activity implementations looks like normal activity subclasses.
  */

@Override
public void setContentView(int layoutResID) {
    if (frameLayout != null) {
        LayoutInflater inflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
        ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT);
        View stubView = inflater.inflate(layoutResID, frameLayout, false);
        frameLayout.addView(stubView, lp);
    }
}

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

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



@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
// Handle navigation view item clicks here.
    int id = item.getItemId();

    if (id == R.id.nav_camera) {
        // Handle the camera action
    } else if (id == R.id.nav_gallery) {

    } else if (id == R.id.nav_slideshow) {

    } else if (id == R.id.nav_manage) {

    } else if (id == R.id.nav_share) {

    } else if (id == R.id.nav_send) {

    }

    drawer.closeDrawer(GravityCompat.START);
    return true;
}
}

2. 你的 MainActivity.java 应该看起来像这个MainActivity.java

    package com.example.eddie.drawerapp2; //skip imports public class MainActivity extends BaseActivity{ private DrawerLayout drawer; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } }

3.activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout 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">

        <include
            layout="@layout/app_bar_main"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />


    </RelativeLayout>