Android 导航抽屉列表视图为空

我有一个应用程序，第一个活动是登录页面。当用户成功登录时，他会看到他的项目。我正在使用

ListFragment

来显示这个列表（因为我还有一些公共项目，用户可以在登录页面的一半看到）。在他登录后，我将在活动中添加一个导航抽屉。在经历了很多混乱之后，我能够在活动中添加导航抽屉，但是它有一个空列表

DrawerActivity.java:

public class DrawerActivity extends Activity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;

private CharSequence mDrawerTitle;
private CharSequence mTitle;
private String[] mScreenTitles;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.private_project_list);
    mTitle = mDrawerTitle = getTitle();
    mScreenTitles = getResources().getStringArray(R.array.screen_titles);
    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    mDrawerList = (ListView) findViewById(R.id.left_drawer);

    mDrawerList.setAdapter(new ArrayAdapter<String>(this,
            R.layout.drawer_list_item, mScreenTitles));
    //mDrawerList.setOnItemClickListener(new DrawerItemClickListener());

    // enable ActionBar app icon to behave as action to toggle nav drawer
    getActionBar().setDisplayHomeAsUpEnabled(true);
    getActionBar().setHomeButtonEnabled(true);

    // ActionBarDrawerToggle ties together the the proper interactions
    // between the sliding drawer and the action bar app icon
    mDrawerToggle = new ActionBarDrawerToggle(
            this,                  /* host Activity */
            mDrawerLayout,         /* DrawerLayout object */
            R.drawable.ic_navigation_drawer,  /* nav drawer image to replace 'Up' caret */
            R.string.drawer_open,  /* "open drawer" description for accessibility */
            R.string.drawer_close  /* "close drawer" description for accessibility */
    ) {
        public void onDrawerClosed(View view) {
            getActionBar().setTitle(mTitle);
            invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
        }

        public void onDrawerOpened(View drawerView) {
            getActionBar().setTitle(mDrawerTitle);
            invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
        }
    };
    mDrawerLayout.setDrawerListener(mDrawerToggle);

    if (savedInstanceState == null) {
        selectItem(0);
    }
}

/* Called whenever we call invalidateOptionsMenu() */
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
    // If the nav drawer is open, hide action items related to the content view
    return super.onPrepareOptionsMenu(menu);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // The action bar home/up action should open or close the drawer.
    // ActionBarDrawerToggle will take care of this.
    if (mDrawerToggle.onOptionsItemSelected(item)) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

/* The click listner for ListView in the navigation drawer */
private class DrawerItemClickListener implements ListView.OnItemClickListener {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        selectItem(position);
    }
}

private void selectItem(int position) {

    }
}

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
android:id="@+id/drawer_layout"
xmlns:android="http://schemas.android.com/apk/res/android">

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:id="@+id/privateProjectsContainer"
android:background="#eeeeee">


</FrameLayout>

<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>

公共类活动扩展活动{
私人抽屉布局mDrawerLayout；
私有列表视图mDrawerList；
私有操作bardrawertoggle mDrawerToggle；
私有字符序列mDrawerTitle；
私有字符序列mTitle；
私有字符串[]mScreenTitles；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.private项目列表）；
mTitle=mDrawerTitle=getTitle（）；
mscreentTitles=getResources（）.getStringArray（R.array.screen_titles）；
mDrawerLayout=（抽屉布局）findViewById（R.id.抽屉布局）；
mDrawerList=（ListView）findViewById（R.id.left\u抽屉）；
mDrawerList.setAdapter（新阵列适配器，
R.layout.drawer_list_item，mscreen titles）；
//setOnItemClickListener（新的DrawerItemClickListener（））；
//启用ActionBar应用程序图标作为切换导航抽屉的操作
getActionBar（）.setDisplayHomeAsUpEnabled（true）；
getActionBar（）.setHomeButtonEnabled（true）；
//ActionBarDrawerToggle将适当的交互连接在一起
//在滑动抽屉和操作栏应用程序图标之间
mDrawerToggle=新操作bardrawertoggle(
此，/*主机活动*/
mDrawerLayout，/*抽屉布局对象*/
R.drawable.ic\u导航\u抽屉，/*导航抽屉图像替换“向上”插入符号*/
R.string.drawer\u open，/*“open drawer”描述，用于辅助功能*/
R.string.drawer\u close/*“close drawer”可访问性说明*/
) {
公共无效onDrawerClosed（视图）{
getActionBar（）.setTitle（mTitle）；
InvalidateOptions SMenu（）；//创建对OnPrepareOptions SMenu（）的调用
}
打开图纸上的公共空白（视图抽屉视图）{
getActionBar（）.setTitle（mDrawerTitle）；
InvalidateOptions SMenu（）；//创建对OnPrepareOptions SMenu（）的调用
}
};
mDrawerLayout.setDrawerListener（mDrawerToggle）；
如果（savedInstanceState==null）{
选择项目（0）；
}
}
/*调用InvalidateOptions菜单（）时调用*/
@凌驾
公共布尔值OnPrepareOptions菜单（菜单）{
//如果导航抽屉打开，则隐藏与内容视图相关的操作项
返回super.onPrepareOptions菜单（菜单）；
}
@凌驾
公共布尔值onOptionsItemSelected（菜单项项）{
//操作栏home/up操作应打开或关闭抽屉。
//ActionBarDrawerToggle会处理好的。
如果（MDRAWERTOGLE.onOptionsItemSelected（项目））{
返回true；
}
返回super.onOptionsItemSelected（项目）；
}
/*在导航抽屉中单击ListView的listner*/
私有类DrawerItemClickListener实现ListView.OnItemClickListener{
@凌驾
public void onItemClick（AdapterView父对象、视图、整型位置、长id）{
选择项目（位置）；
}
}
私有void selectItem（内部位置）{
}
}

PrivateProjectListActivity.java:（扩展了抽屉的实用性）

公共类PrivateProjectListActivity扩展了实用性{
私有最终静态字符串标记_TITLE=“TITLE”；
私有最终静态字符串标记\u ANIM\u ARRAY\u ID=“animation\u ARRAY”；
私有最终静态字符串TAG_PROJECTS=“PROJECTS”；
私有最终静态字符串标记\u ID=“ID”；
JSONArray projects=null；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.private项目列表）；
新的HttpGetHandler（）.execute（）；
}
私有类HttpGetHandler扩展异步任务{
@凌驾
受保护的Void doInBackground（字符串…参数）{
字符串jsonUrl=”http://canvasflip.com/protected/actions/user.php?action=get-项目和网络=护送和索引=0和计数=100”；
HttpGet HttpGet=新的HttpGet（jsonUrl）；
试一试{
HttpResponse HttpResponse=MainActivity.httpClient.execute（httpGet）；
HttpEntity HttpEntity=httpResponse.getEntity（）；
InputStream content=httpEntity.getContent（）；
字符串结果=convertToString（内容）；
JSONObject JSONObject=新JSONObject（结果）；
projects=jsonObject.getJSONArray（TAG_项目）；
PrivateProjectListActivity.this.runOnUiThread（新的Runnable（）文件）{
@凌驾
公开募捐{
试一试{
ArrayList projectTitle=新建ArrayList（）；
ArrayList imageId=新的ArrayList（）；
ArrayList playId=新的ArrayList（）；
对于（int i=0；i我建议您按照以下方式进行操作：

在
DrawerActivity
中，只创建导航抽屉，不使用
onCreate（）
，而是使用
onStart（）
。将在扩展
DrawerActivity
的活动中调用
onCreate（）
，在那里您将调用
setContentView

你的班级看起来是这样的：

public class DrawerActivity extends Activity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;

private CharSequence mDrawerTitle;
private CharSequence mTitle;
private String[] mScreenTitles;

@Override
    protected void onStart(){
        super.onStart();
        mTitle = mDrawerTitle = getTitle();
        mScreenTitles = getResources().getStringArray(R.array.screen_titles);
        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerList = (ListView) findViewById(R.id.left_drawer);

        mDrawerList.setAdapter(new ArrayAdapter<String>(this,
                R.layout.drawer_list_item, mScreenTitles));
        //mDrawerList.setOnItemClickListener(new DrawerItemClickListener());

        // enable ActionBar app icon to behave as action to toggle nav drawer
        getActionBar().setDisplayHomeAsUpEnabled(true);
        getActionBar().setHomeButtonEnabled(true);

        // ActionBarDrawerToggle ties together the the proper interactions
        // between the sliding drawer and the action bar app icon
        mDrawerToggle = new ActionBarDrawerToggle(
                this,                  /* host Activity */
                mDrawerLayout,         /* DrawerLayout object */
                R.drawable.ic_navigation_drawer,  /* nav drawer image to replace 'Up' caret */
                R.string.drawer_open,  /* "open drawer" description for accessibility */
                R.string.drawer_close  /* "close drawer" description for accessibility */
        ) {
            public void onDrawerClosed(View view) {
                getActionBar().setTitle(mTitle);
                invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
            }

            public void onDrawerOpened(View drawerView) {
                getActionBar().setTitle(mDrawerTitle);
                invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
            }
        };
        mDrawerLayout.setDrawerListener(mDrawerToggle);

        if (savedInstanceState == null) {
            selectItem(0);
        }
}

/* Called whenever we call invalidateOptionsMenu() */
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
    // If the nav drawer is open, hide action items related to the content view
    return super.onPrepareOptionsMenu(menu);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // The action bar home/up action should open or close the drawer.
    // ActionBarDrawerToggle will take care of this.
    if (mDrawerToggle.onOptionsItemSelected(item)) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

/* The click listner for ListView in the navigation drawer */
private class DrawerItemClickListener implements ListView.OnItemClickListener {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        selectItem(position);
    }
}

private void selectItem(int position) {

    }
}

我想当您扩展活动时，第一个私有项目列表布局将被第二个布局所取代。@user2217535那么我应该怎么做？我想您可以放置新的HttpGetHandler（）.execute（）；在DrawerActivity本身中，不需要两个类，我正在这样做，因为将来如果我有两个以上的活动要显示导航抽屉，那么我必须遵循这种扩展DrawerActivity的方法，因此我无法编写
public class DrawerActivity extends Activity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;

private CharSequence mDrawerTitle;
private CharSequence mTitle;
private String[] mScreenTitles;

@Override
    protected void onStart(){
        super.onStart();
        mTitle = mDrawerTitle = getTitle();
        mScreenTitles = getResources().getStringArray(R.array.screen_titles);
        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerList = (ListView) findViewById(R.id.left_drawer);

        mDrawerList.setAdapter(new ArrayAdapter<String>(this,
                R.layout.drawer_list_item, mScreenTitles));
        //mDrawerList.setOnItemClickListener(new DrawerItemClickListener());

        // enable ActionBar app icon to behave as action to toggle nav drawer
        getActionBar().setDisplayHomeAsUpEnabled(true);
        getActionBar().setHomeButtonEnabled(true);

        // ActionBarDrawerToggle ties together the the proper interactions
        // between the sliding drawer and the action bar app icon
        mDrawerToggle = new ActionBarDrawerToggle(
                this,                  /* host Activity */
                mDrawerLayout,         /* DrawerLayout object */
                R.drawable.ic_navigation_drawer,  /* nav drawer image to replace 'Up' caret */
                R.string.drawer_open,  /* "open drawer" description for accessibility */
                R.string.drawer_close  /* "close drawer" description for accessibility */
        ) {
            public void onDrawerClosed(View view) {
                getActionBar().setTitle(mTitle);
                invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
            }

            public void onDrawerOpened(View drawerView) {
                getActionBar().setTitle(mDrawerTitle);
                invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
            }
        };
        mDrawerLayout.setDrawerListener(mDrawerToggle);

        if (savedInstanceState == null) {
            selectItem(0);
        }
}

/* Called whenever we call invalidateOptionsMenu() */
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
    // If the nav drawer is open, hide action items related to the content view
    return super.onPrepareOptionsMenu(menu);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // The action bar home/up action should open or close the drawer.
    // ActionBarDrawerToggle will take care of this.
    if (mDrawerToggle.onOptionsItemSelected(item)) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

/* The click listner for ListView in the navigation drawer */
private class DrawerItemClickListener implements ListView.OnItemClickListener {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        selectItem(position);
    }
}

private void selectItem(int position) {

    }
}

@Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        // Sync the toggle state after onRestoreInstanceState has occurred.
        mDrawerToggle.syncState();
    }

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