我希望在我的NavigationDrawer和ListView下方包含导航项目的图片。因此，我为LinearLayout设置NavigationDrawer，其中包含ImageView和ListView。不幸的是它不起作用，我得到错误：
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: FATAL EXCEPTION: main
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.pymdev.pym_app/com.example.pymdev.pym_app.MenuActivity}: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2114)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2139)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.app.ActivityThread.access$700(ActivityThread.java:143)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1241)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:99)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.os.Looper.loop(Looper.java:137)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:4960)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at java.lang.reflect.Method.invokeNative(Native Method)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:511)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at dalvik.system.NativeStart.main(Native Method)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: Caused by: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.view.ViewGroup.addViewInner(ViewGroup.java:3439)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.view.ViewGroup.addView(ViewGroup.java:3310)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.support.v4.widget.DrawerLayout.addView(DrawerLayout.java:1730)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.view.ViewGroup.addView(ViewGroup.java:3286)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.view.LayoutInflater.rInflate(LayoutInflater.java:761)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.view.LayoutInflater.inflate(LayoutInflater.java:495)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:255)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:109)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at com.example.pymdev.pym_app.MenuActivity.onCreate(MenuActivity.java:51)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.app.Activity.performCreate(Activity.java:5203)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2078)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2139)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.app.ActivityThread.access$700(ActivityThread.java:143)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1241)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:99)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.os.Looper.loop(Looper.java:137)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:4960)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at java.lang.reflect.Method.invokeNative(Native Method)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:511)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
10-22 16:39:00.609 6555-6555/com.example.pymdev.pym_app E/AndroidRuntime: at dalvik.system.NativeStart.main(Native Method)
我的fragment_navigation_drawer.xml：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.example.pymdev.pym_app.NavigationDrawerFragment"
android:id="@+id/navDrawerLinearLayout"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="match_parent"
>
<ImageView
android:id="@+id/navDrawerImageView"
android:layout_width="match_parent"
android:layout_height="50dp"
android:src="@drawable/pym_cooler_drawer"/>
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:id="@+id/navDrawerListView"
android:layout_height="match_parent" android:choiceMode="singleChoice"
android:divider="@color/dark_divider" android:dividerHeight="1dp"
android:background="@android:color/black"
android:listSelector="@drawable/drawer_selection"
tools:context="com.example.pymdev.pym_app.NavigationDrawerFragment" />
</LinearLayout>
我的activity_menu.xml：
<!-- A DrawerLayout is intended to be used as the top-level content view using match_parent for both width and height to consume the full space available. -->
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:id="@+id/drawer_layout"
android:layout_width="match_parent" android:layout_height="match_parent"
tools:context="com.example.pymdev.pym_app.MenuActivity">
<!-- As the main content view, the view below consumes the entire
space available using match_parent in both dimensions. -->
<FrameLayout android:id="@+id/container" android:layout_width="match_parent"
android:layout_height="match_parent" />
<!-- android:layout_gravity="start" tells DrawerLayout to treat
this as a sliding drawer on the left side for left-to-right
languages and on the right side for right-to-left languages.
If you're not building against API 17 or higher, use
android:layout_gravity="left" instead. -->
<!-- The drawer is given a fixed width in dp and extends the full height of
the container. -->
<fragment android:id="@+id/navigation_drawer"
android:layout_width="@dimen/navigation_drawer_width" android:layout_height="match_parent"
android:layout_gravity="start"
android:name="com.example.pymdev.pym_app.NavigationDrawerFragment"
tools:layout="@layout/fragment_navigation_drawer" />
</android.support.v4.widget.DrawerLayout>
NavigationDrawerFragment类：
public class NavigationDrawerFragment extends Fragment {
/**
* Remember the position of the selected item.
*/
private static final String STATE_SELECTED_POSITION = "selected_navigation_drawer_position";
/**
* Per the design guidelines, you should show the drawer on launch until the user manually
* expands it. This shared preference tracks this.
*/
private static final String PREF_USER_LEARNED_DRAWER = "navigation_drawer_learned";
/**
* A pointer to the current callbacks instance (the Activity).
*/
private NavigationDrawerCallbacks mCallbacks;
/**
* Helper component that ties the action bar to the navigation drawer.
*/
private ActionBarDrawerToggle mDrawerToggle;
private DrawerLayout mDrawerLayout;
private ListView mDrawerListView;
/* For top pic we need a linear layout wrapper */
private LinearLayout mDrawerLinearLayout;
private View mFragmentContainerView;
private int mCurrentSelectedPosition = 0;
private boolean mFromSavedInstanceState;
private boolean mUserLearnedDrawer;
public NavigationDrawerFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Read in the flag indicating whether or not the user has demonstrated awareness of the
// drawer. See PREF_USER_LEARNED_DRAWER for details.
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity());
mUserLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false);
if (savedInstanceState != null) {
mCurrentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION);
mFromSavedInstanceState = true;
}
// Select either the default item (0) or the last selected item.
selectItem(mCurrentSelectedPosition);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
// Indicate that this fragment would like to influence the set of actions in the action bar.
setHasOptionsMenu(true);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
/* Inflate the whole Linear Layout for the drawer */
mDrawerLinearLayout = (LinearLayout) inflater.inflate(
R.layout.fragment_navigation_drawer, container, false);
/* Find the encapsulated listView */
mDrawerListView = (ListView) mDrawerLinearLayout.findViewById(R.id.navDrawerListView);
/*
mDrawerListView = (ListView) inflater.inflate(
R.layout.fragment_navigation_drawer, container, false);
*/
mDrawerListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
selectItem(position);
}
});
//Use Custom Adapter instead:
mDrawerListView.setAdapter(new CustomNavAdapter(
NavigationDrawerFragment.this.getActivity(),
getResources().getStringArray(R.array.section_titles),
new Integer[]{
R.mipmap.ic_launcher,
R.mipmap.ic_launcher,
R.mipmap.ic_launcher,
R.mipmap.ic_launcher,
R.mipmap.ic_launcher,
R.mipmap.ic_launcher,
}));
mDrawerListView.setItemChecked(mCurrentSelectedPosition, true);
return mDrawerListView;
}
/* Custom array adapter tu support Images and Pictures combined */
public class CustomNavAdapter extends ArrayAdapter<String> {
private final Activity _context;
private final String[] _text;
private final Integer[] _imageId;
public CustomNavAdapter(Activity context, String[] text, Integer[] imageId) {
super(context, R.layout.navigation_drawer_textview, text);
this._context = context;
this._text = text;
this._imageId = imageId;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = _context.getLayoutInflater();
View rowView = inflater.inflate(R.layout.navigation_drawer_textview, null, true);
TextView txtTitle = (TextView) rowView.findViewById(R.id.text);
ImageView imageView = (ImageView) rowView.findViewById(R.id.icon);
txtTitle.setText(_text[position]);
imageView.setImageResource(_imageId[position]);
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
int selectedPosition = sharedPreferences.getInt("SELECTED_POSITION_KEY", -1);
/*
if (selectedPosition == position) {
reviewImageView.setImageResource(yourSelectedImageResource);
}
*/
return rowView;
}
}
public boolean isDrawerOpen() {
return mDrawerLayout != null && mDrawerLayout.isDrawerOpen(mFragmentContainerView);
}
/**
* Users of this fragment must call this method to set up the navigation drawer interactions.
*
* @param fragmentId The android:id of this fragment in its activity's layout.
* @param drawerLayout The DrawerLayout containing this fragment's UI.
*/
public void setUp(int fragmentId, DrawerLayout drawerLayout) {
mFragmentContainerView = getActivity().findViewById(fragmentId);
mDrawerLayout = drawerLayout;
// set a custom shadow that overlays the main content when the drawer opens
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
// set up the drawer's list view with items and click listener
ActionBar actionBar = getActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setHomeButtonEnabled(true);
// ActionBarDrawerToggle ties together the the proper interactions
// between the navigation drawer and the action bar app icon.
mDrawerToggle = new ActionBarDrawerToggle(
getActivity(), /* host Activity */
mDrawerLayout, /* DrawerLayout object */
R.string.navigation_drawer_open, /* "open drawer" description for accessibility */
R.string.navigation_drawer_close /* "close drawer" description for accessibility */
) {
@Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
if (!isAdded()) {
return;
}
getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu()
}
@Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
if (!isAdded()) {
return;
}
if (!mUserLearnedDrawer) {
// The user manually opened the drawer; store this flag to prevent auto-showing
// the navigation drawer automatically in the future.
mUserLearnedDrawer = true;
SharedPreferences sp = PreferenceManager
.getDefaultSharedPreferences(getActivity());
sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true).apply();
}
getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu()
}
};
// If the user hasn't 'learned' about the drawer, open it to introduce them to the drawer,
// per the navigation drawer design guidelines.
if (!mUserLearnedDrawer && !mFromSavedInstanceState) {
mDrawerLayout.openDrawer(mFragmentContainerView);
}
// Defer code dependent on restoration of previous instance state.
mDrawerLayout.post(new Runnable() {
@Override
public void run() {
mDrawerToggle.syncState();
}
});
mDrawerLayout.setDrawerListener(mDrawerToggle);
}
private void selectItem(int position) {
mCurrentSelectedPosition = position;
if (mDrawerListView != null) {
mDrawerListView.setItemChecked(position, true);
}
if (mDrawerLayout != null) {
mDrawerLayout.closeDrawer(mFragmentContainerView);
}
if (mCallbacks != null) {
mCallbacks.onNavigationDrawerItemSelected(position);
}
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mCallbacks = (NavigationDrawerCallbacks) activity;
} catch (ClassCastException e) {
throw new ClassCastException("Activity must implement NavigationDrawerCallbacks.");
}
}
@Override
public void onDetach() {
super.onDetach();
mCallbacks = null;
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt(STATE_SELECTED_POSITION, mCurrentSelectedPosition);
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Forward the new configuration the drawer toggle component.
mDrawerToggle.onConfigurationChanged(newConfig);
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
// If the drawer is open, show the global app actions in the action bar. See also
// showGlobalContextActionBar, which controls the top-left area of the action bar.
if (mDrawerLayout != null && isDrawerOpen()) {
inflater.inflate(R.menu.global, menu);
showGlobalContextActionBar();
}
super.onCreateOptionsMenu(menu, inflater);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
if (item.getItemId() == R.id.action_logout) {
/* Logout from facebook */
LoginManager.getInstance().logOut();
/* Switch back to login screen */
Intent intent = new Intent(getActivity(), LoginActivity.class);
startActivity(intent);
Toast.makeText(getActivity(), "Logout!", Toast.LENGTH_SHORT).show();
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* Per the navigation drawer design guidelines, updates the action bar to show the global app
* 'context', rather than just what's in the current screen.
*/
private void showGlobalContextActionBar() {
ActionBar actionBar = getActionBar();
actionBar.setDisplayShowTitleEnabled(true);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
actionBar.setTitle(R.string.app_name);
}
private ActionBar getActionBar() {
return ((AppCompatActivity) getActivity()).getSupportActionBar();
}
/**
* Callbacks interface that all activities using this fragment must implement.
*/
public static interface NavigationDrawerCallbacks {
/**
* Called when an item in the navigation drawer is selected.
*/
void onNavigationDrawerItemSelected(int position);
}
}
答案 0 :(得分：0)
在黑暗中完全是一个镜头，在这里，因为有许多Java代码我不想透视，但看起来你的片段xml配置错误。也许你开始使用ListView，然后将其包装在LinearLayout中？试试这个。
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.example.pymdev.pym_app.NavigationDrawerFragment"
android:id="@+id/navDrawerLinearLayout"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<ImageView
android:id="@+id/navDrawerImageView"
android:layout_width="match_parent"
android:layout_height="50dp"
android:src="@drawable/pym_cooler_drawer"/>
<ListView
android:layout_width="match_parent"
android:id="@+id/navDrawerListView"
android:layout_height="match_parent"
android:choiceMode="singleChoice"
android:divider="@color/dark_divider"
android:dividerHeight="1dp"
android:background="@android:color/black"
android:listSelector="@drawable/drawer_selection" />
</LinearLayout>
答案 1 :(得分：0)
嗨，实际上我使用本教程让它工作得非常好：
https://guides.codepath.com/android/Fragment-Navigation-Drawer
我完全遵循了一切，现在我的项目结构也更加清晰。