我正在使用导航抽屉为我的大学制作Android应用程序。它有两种类型的用户 - 学生和学院。因此，根据email-id / username，我想在抽屉/滑块中加载相应用户的组件。 我经历了这个问题，这表明我们可以在子布局中使用任何布局：Is it possible to use something other than a listview as sliding drawer in drawerlayout
因此，为了实现我的逻辑，我希望使用3个动态片段：login_fragment，student_fragment，faculty_fragment。然后使用用户名类型我将使用抽屉中的student / faculty_fragment替换login_fragment。 但是我在使用动态片段加载抽屉时遇到错误。
这是我用来在抽屉中加载动态片段的main_activity代码（抽屉我是指滑块）。主要的布局部分即content_frame已经使用相同的方法完成，没有错误。
导航抽屉布局文件：
//main_activity.xml layout file
<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">
<!-- As the main content view, the view below consumes the entire
space available using match_parent in both dimensions. -->
<FrameLayout
android:id="@+id/content_frame"
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.
The drawer is given a fixed width in dp and extends the full height of
the container. A solid background is used for contrast
with the content view. -->
<FrameLayout
android:id="@+id/left_drawer"
android:layout_width="320dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="#111" >
</FrameLayout>
这是相应布局的.java文件，我认为错误在于加载抽屉列表布局：
// Main_Activity
package com.kodevelop.gndec;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.app.SearchManager;
import android.content.Intent;
import android.content.res.Configuration;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class LaunchActivity extends FragmentActivity {
private DrawerLayout DrawerLayout;
private ListView DrawerList;
private ActionBarDrawerToggle DrawerToggle;
@SuppressWarnings("unused")
private CharSequence DrawerTitle;
private CharSequence Title;
private String[] ListTitles;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.drawerlist_test);
Title = DrawerTitle = getTitle();
ListTitles = getResources().getStringArray(R.array.list_array);
DrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
DrawerList = (ListView) findViewById(R.id.left_drawer);
// initialize drawer list
// Also set a custom shadow that overlays the main content when the drawer opens
DrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
// add fragments to drawer list
Fragment newFragment;
FragmentTransaction transaction = getFragmentManager().beginTransaction();
newFragment = new testfragment();
transaction.replace(R.id.left_drawer, newFragment);
transaction.addToBackStack(null);
transaction.commit();
System.out.println("check1........ + fragment created");
/*
// set up the drawer's list view with items and click listener
DrawerList.setAdapter(new ArrayAdapter<String>(this, R.layout.drawer_itemlist, ListTitles));
DrawerList.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
DrawerToggle = new ActionBarDrawerToggle(
this, /* host Activity */
DrawerLayout, /* DrawerLayout object */
R.drawable.ic_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(Title);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(Title); // same title for open/close drawer
//getActionBar().setTitle(DrawerTitle);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
};
DrawerLayout.setDrawerListener(DrawerToggle);
if (savedInstanceState == null) {
selectItem(0);
}
}
/**
* When using the ActionBarDrawerToggle, you must call it during
* onPostCreate() and onConfigurationChanged()...
*/
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
DrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggle
DrawerToggle.onConfigurationChanged(newConfig);
}
// option menu - action bar
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
return super.onCreateOptionsMenu(menu);
}
// 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
boolean drawerOpen = DrawerLayout.isDrawerOpen(DrawerList);
menu.findItem(R.id.action_websearch).setVisible(!drawerOpen);
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 (DrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle action buttons
switch(item.getItemId()) {
case R.id.action_websearch:
// create intent to perform web search for this planet
Intent intent = new Intent(Intent.ACTION_WEB_SEARCH);
intent.putExtra(SearchManager.QUERY, getActionBar().getTitle());
// catch event that there's no activity to handle intent
if (intent.resolveActivity(getPackageManager()) != null) {
startActivity(intent);
} else {
Toast.makeText(this, R.string.app_not_available, Toast.LENGTH_LONG).show();
}
return true;
default:
return super.onOptionsItemSelected(item);
}
}
// Nav Drawer List click
// The click listener 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) {
Fragment newFragment;
FragmentTransaction transaction = getFragmentManager().beginTransaction();
switch (position) {
case 0:
newFragment = new f1();
transaction.replace(R.id.content_frame, newFragment);
transaction.addToBackStack(null);
transaction.commit();
break;
case 1:
newFragment = new f2();
transaction.replace(R.id.content_frame, newFragment);
transaction.addToBackStack(null);
transaction.commit();
break;
case 2:
newFragment = new f3();
transaction.replace(R.id.content_frame, newFragment);
transaction.addToBackStack(null);
transaction.commit();
break;
case 3:
newFragment = new f4();
transaction.replace(R.id.content_frame, newFragment);
transaction.addToBackStack(null);
transaction.commit();
break;
}
DrawerList.setItemChecked(position, true);
setTitle(ListTitles[position]);
DrawerLayout.closeDrawer(DrawerList);
}
@Override
public void setTitle(CharSequence title) {
Title = title;
getActionBar().setTitle(Title);
}
}
这是logcat错误列表：
11-24 13:16:53.058: E/Trace(18812): error opening trace file: No such file or directory (2)
11-24 13:16:53.058: W/Trace(18812): Unexpected value from nativeGetEnabledTags: 0
11-24 13:16:53.058: W/Trace(18812): Unexpected value from nativeGetEnabledTags: 0
11-24 13:16:53.058: W/Trace(18812): Unexpected value from nativeGetEnabledTags: 0
11-24 13:16:53.068: W/Trace(18812): Unexpected value from nativeGetEnabledTags: 0
11-24 13:16:53.068: W/Trace(18812): Unexpected value from nativeGetEnabledTags: 0
11-24 13:16:53.108: D/AndroidRuntime(18812): Shutting down VM
11-24 13:16:53.108: W/dalvikvm(18812): threadid=1: thread exiting with uncaught exception (group=0xb2e17908)
11-24 13:16:53.108: E/AndroidRuntime(18812): FATAL EXCEPTION: main
11-24 13:16:53.108: E/AndroidRuntime(18812): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.kodevelop.gndec/com.kodevelop.gndec.LaunchActivity}: java.lang.ClassCastException: android.widget.FrameLayout cannot be cast to android.widget.ListView
11-24 13:16:53.108: E/AndroidRuntime(18812): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
11-24 13:16:53.108: E/AndroidRuntime(18812): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
11-24 13:16:53.108: E/AndroidRuntime(18812): at android.app.ActivityThread.access$600(ActivityThread.java:141)
11-24 13:16:53.108: E/AndroidRuntime(18812): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
11-24 13:16:53.108: E/AndroidRuntime(18812): at android.os.Handler.dispatchMessage(Handler.java:99)
11-24 13:16:53.108: E/AndroidRuntime(18812): at android.os.Looper.loop(Looper.java:137)
11-24 13:16:53.108: E/AndroidRuntime(18812): at android.app.ActivityThread.main(ActivityThread.java:5039)
11-24 13:16:53.108: E/AndroidRuntime(18812): at java.lang.reflect.Method.invokeNative(Native Method)
11-24 13:16:53.108: E/AndroidRuntime(18812): at java.lang.reflect.Method.invoke(Method.java:511)
11-24 13:16:53.108: E/AndroidRuntime(18812): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
11-24 13:16:53.108: E/AndroidRuntime(18812): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
11-24 13:16:53.108: E/AndroidRuntime(18812): at dalvik.system.NativeStart.main(Native Method)
11-24 13:16:53.108: E/AndroidRuntime(18812): Caused by: java.lang.ClassCastException: android.widget.FrameLayout cannot be cast to android.widget.ListView
11-24 13:16:53.108: E/AndroidRuntime(18812): at com.kodevelop.gndec.LaunchActivity.onCreate(LaunchActivity.java:42)
11-24 13:16:53.108: E/AndroidRuntime(18812): at android.app.Activity.performCreate(Activity.java:5104)
11-24 13:16:53.108: E/AndroidRuntime(18812): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
11-24 13:16:53.108: E/AndroidRuntime(18812): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
11-24 13:16:53.108: E/AndroidRuntime(18812): ... 11 more
我愿意以压缩格式共享整个代码，以便在需要时在系统中导入项目。
答案 0 :(得分：2)
您正在尝试获取framelayout的ID，但将其转换为listview
DrawerList = (ListView) findViewById(R.id.left_drawer);
实际应该是
DrawerList = (FrameLayout) findViewById(R.id.left_drawer);