不同活动中的同一导航抽屉

Question

public class NavigationDrawer extends Activity {
public DrawerLayout drawerLayout;
public ListView drawerList;
private ActionBarDrawerToggle drawerToggle;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    drawerToggle = new ActionBarDrawerToggle((Activity) this, drawerLayout, R.drawable.ic_drawer, 0, 0) {

        public void onDrawerClosed(View view) {
            getActionBar().setTitle(R.string.app_name);
        }

        public void onDrawerOpened(View drawerView) {
            getActionBar().setTitle(R.string.menu);
        }
    };
    drawerLayout.setDrawerListener(drawerToggle);

    getActionBar().setDisplayHomeAsUpEnabled(true);
    getActionBar().setHomeButtonEnabled(true);

    listItems = getResources().getStringArray(R.array.layers_array);
    drawerList = (ListView) findViewById(R.id.left_drawer);
    drawerList.setAdapter(new ArrayAdapter<String>(this, R.layout.drawer_list_item, android.R.id.text,
            listItems));
    
    drawerList.setOnItemClickListener(new OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int pos, long arg3) {
            drawerClickEvent(pos);
        }
    });
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {

    if (drawerToggle.onOptionsItemSelected(item)) {
        return true;
    }
    return super.onOptionsItemSelected(item);

}

@Override
protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);
    drawerToggle.syncState();
}

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    drawerToggle.onConfigurationChanged(newConfig);
}
}

在本活动中，我希望拥有导航抽屉，因此我扩展了'NavigationDrawer'，在其他一些活动中，我希望使用相同的导航抽屉

  public class SampleActivity extends NavigationDrawer {...}

Answer 1

如果你想要一个导航抽屉，你应该使用碎片。上周我学习了这篇教程,它很管用：

http://developer.android.com/training/implementation-navigation/nav-drawer.html

您还可以从本教程下载示例代码，了解如何执行此操作。

public class BaseActivity extends Activity
{
    public DrawerLayout drawerLayout;
    public ListView drawerList;
    public String[] layers;
    private ActionBarDrawerToggle drawerToggle;
    private Map map;

    protected void onCreate(Bundle savedInstanceState)
    {
        // R.id.drawer_layout should be in every activity with exactly the same id.
        drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);

        drawerToggle = new ActionBarDrawerToggle((Activity) this, drawerLayout, R.drawable.ic_drawer, 0, 0) 
        {
            public void onDrawerClosed(View view) 
            {
                getActionBar().setTitle(R.string.app_name);
            }

            public void onDrawerOpened(View drawerView) 
            {
                getActionBar().setTitle(R.string.menu);
            }
        };
        drawerLayout.setDrawerListener(drawerToggle);

        getActionBar().setDisplayHomeAsUpEnabled(true);
        getActionBar().setHomeButtonEnabled(true);

        layers = getResources().getStringArray(R.array.layers_array);
        drawerList = (ListView) findViewById(R.id.left_drawer);
        View header = getLayoutInflater().inflate(R.layout.drawer_list_header, null);
        drawerList.addHeaderView(header, null, false);
        drawerList.setAdapter(new ArrayAdapter<String>(this, R.layout.drawer_list_item, android.R.id.text1,
                layers));
        View footerView = ((LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(
                R.layout.drawer_list_footer, null, false);
        drawerList.addFooterView(footerView);

        drawerList.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int pos, long arg3) {
                map.drawerClickEvent(pos);
            }
        });
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        if (drawerToggle.onOptionsItemSelected(item)) {
            return true;
        }
        return super.onOptionsItemSelected(item);

    }

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        drawerToggle.syncState();
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        drawerToggle.onConfigurationChanged(newConfig);
    }
}

public class AnyActivity extends BaseActivity
{
    //Because this activity extends BaseActivity it automatically has the navigation drawer
    //You can just write your normal Activity code and you don't need to add anything for the navigation drawer
}

<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <!-- The main content view -->
    <FrameLayout
        android:id="@+id/content_frame"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
        <!-- Put what you want as your normal screen in here, you can also choose for a linear layout or any other layout, whatever you prefer -->
    </FrameLayout>
    <!-- The navigation drawer -->
    <ListView android:id="@+id/left_drawer"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:choiceMode="singleChoice"
        android:divider="@android:color/transparent"
        android:dividerHeight="0dp"
        android:background="#111"/>
</android.support.v4.widget.DrawerLayout>

我自己也经历了一些困难，所以如果您得到NullPointerExceptions，这里有一个解决方案。在BaseActivity中，将onCreate函数更改为protected void onCreateDrawer()。其余的可以保持不变。在扩展BaseActivity的活动中，按以下顺序排列代码：

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity);
    super.onCreateDrawer();

这帮助我解决了我的问题，希望它有帮助！

这就是您如何创建一个具有多个活动的导航抽屉，如果您有任何问题，请随时询问。

编辑2：

正如@gregdan所说，您的baseActivity还可以重写setContentView()并在此处调用onCreateDrawer：

@Override 
public void setContentView(@LayoutRes int layoutResID) 
{ 
    super.setContentView(layoutResID); 
    onCreateDrawer() ;
}