我正在尝试一个有滑动菜单的项目。但我想在api级别运行它8.因此我使用了支持库来获得结果。但是应用程序是强制关闭。主类的代码是：
package info.androidhive.slidingmenu;
import info.androidhive.slidingmenu.adapter.NavDrawerListAdapter;
import info.androidhive.slidingmenu.model.NavDrawerItem;
import java.util.ArrayList;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
public class MainActivity extends ActionBarActivity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
// nav drawer title
private CharSequence mDrawerTitle;
// used to store app title
private CharSequence mTitle;
// slide menu items
private String[] navMenuTitles;
private TypedArray navMenuIcons;
private ArrayList<NavDrawerItem> navDrawerItems;
private NavDrawerListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTitle = mDrawerTitle = getTitle();
// load slide menu items
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
// nav drawer icons from resources
navMenuIcons = getResources()
.obtainTypedArray(R.array.nav_drawer_icons);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.list_slidermenu);
navDrawerItems = new ArrayList<NavDrawerItem>();
// adding nav drawer items to array
// Home
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));
// Find People
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
// Photos
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1)));
// Communities, Will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1), true, "22"));
// Pages
navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1)));
// What's hot, We will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1), true, "50+"));
// Recycle the typed array
navMenuIcons.recycle();
mDrawerList.setOnItemClickListener(new SlideMenuClickListener());
// setting the nav drawer list adapter
adapter = new NavDrawerListAdapter(getApplicationContext(),
navDrawerItems);
mDrawerList.setAdapter(adapter);
// enabling action bar app icon and behaving it as toggle button
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_drawer, //nav menu toggle icon
R.string.app_name, // nav drawer open - description for accessibility
R.string.app_name // nav drawer close - description for accessibility
) {
public void onDrawerClosed(View view) {
getSupportActionBar().setTitle(mTitle);
// calling onPrepareOptionsMenu() to show action bar icons
//invalidateOptionsMenu();
supportInvalidateOptionsMenu();
}
public void onDrawerOpened(View drawerView) {
getSupportActionBar().setTitle(mDrawerTitle);
// calling onPrepareOptionsMenu() to hide action bar icons
//invalidateOptionsMenu();
supportInvalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
// on first time display view for first nav item
displayView(0);
}
}
/**
* Slide menu item click listener
* */
private class SlideMenuClickListener implements
ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// display view for selected nav drawer item
displayView(position);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// toggle nav drawer on selecting action bar app icon/title
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle action bar actions click
switch (item.getItemId()) {
case R.id.action_settings:
return true;
default:
return super.onOptionsItemSelected(item);
}
}
/* *
* Called when invalidateOptionsMenu() is triggered
*/
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// if nav drawer is opened, hide the action items
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
/**
* Diplaying fragment view for selected nav drawer list item
* */
private void displayView(int position) {
// update the main content by replacing fragments
android.support.v4.app.Fragment fragment = null;
switch (position) {
case 0:
fragment = new HomeFragment();
break;
case 1:
fragment = new FindPeopleFragment();
break;
case 2:
fragment = new PhotosFragment();
break;
case 3:
fragment = new CommunityFragment();
break;
case 4:
fragment = new PagesFragment();
break;
case 5:
fragment = new WhatsHotFragment();
break;
default:
break;
}
if (fragment != null) {
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
android.support.v4.app.FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.frame_container,fragment);
fragmentTransaction.commit();
// fragmentManager.beginTransaction()
// .replace(R.id.frame_container, fragment).commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(navMenuTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
} else {
// error in creating fragment
Log.e("MainActivity", "Error in creating fragment");
}
}
@Override
public void setTitle(CharSequence title) {
mTitle = title;
getSupportActionBar().setTitle(mTitle);
}
/**
* 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.
mDrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggls
mDrawerToggle.onConfigurationChanged(newConfig);
}
}
LOGCAT：
08-20 14:29:44.687: E/AndroidRuntime(13141): FATAL EXCEPTION: main
08-20 14:29:44.687: E/AndroidRuntime(13141): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{info.androidhive.slidingmenu/info.androidhive.slidingmenu.MainActivity}: java.lang.ClassNotFoundException: info.androidhive.slidingmenu.MainActivity in loader dalvik.system.PathClassLoader[/data/app/info.androidhive.slidingmenu-1.apk]
08-20 14:29:44.687: E/AndroidRuntime(13141): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1573)
08-20 14:29:44.687: E/AndroidRuntime(13141): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
08-20 14:29:44.687: E/AndroidRuntime(13141): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
08-20 14:29:44.687: E/AndroidRuntime(13141): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
08-20 14:29:44.687: E/AndroidRuntime(13141): at android.os.Handler.dispatchMessage(Handler.java:99)
08-20 14:29:44.687: E/AndroidRuntime(13141): at android.os.Looper.loop(Looper.java:130)
08-20 14:29:44.687: E/AndroidRuntime(13141): at android.app.ActivityThread.main(ActivityThread.java:3689)
08-20 14:29:44.687: E/AndroidRuntime(13141): at java.lang.reflect.Method.invokeNative(Native Method)
08-20 14:29:44.687: E/AndroidRuntime(13141): at java.lang.reflect.Method.invoke(Method.java:507)
08-20 14:29:44.687: E/AndroidRuntime(13141): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
08-20 14:29:44.687: E/AndroidRuntime(13141): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
08-20 14:29:44.687: E/AndroidRuntime(13141): at dalvik.system.NativeStart.main(Native Method)
08-20 14:29:44.687: E/AndroidRuntime(13141): Caused by: java.lang.ClassNotFoundException: info.androidhive.slidingmenu.MainActivity in loader dalvik.system.PathClassLoader[/data/app/info.androidhive.slidingmenu-1.apk]
08-20 14:29:44.687: E/AndroidRuntime(13141): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
08-20 14:29:44.687: E/AndroidRuntime(13141): at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
08-20 14:29:44.687: E/AndroidRuntime(13141): at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
08-20 14:29:44.687: E/AndroidRuntime(13141): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
08-20 14:29:44.687: E/AndroidRuntime(13141): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1565)
08-20 14:29:44.687: E/AndroidRuntime(13141): ... 11 more
请帮助!!
答案 0 :(得分：0)
不知道你在清单和菜单文件中声明了什么。但请检查您是否声明了这一点。
清单文件中的：
<application
android:theme="@style/Theme.AppCompat">
in menu file:
的xmlns：机器人=＆＃34; HTTP：//schemas.android.com/apk/res-auto
检查你是否提到过这个。
答案 1 :(得分：0)
你得到的是一个未找到类的例外，这可能是由于没有构建应用程序，尝试构建项目，如果仍然存在干净并再次构建。
答案 2 :(得分：0)
我猜你还没有在 AndroidManifest.xml
中添加 MainActivity在＆lt; application＆gt; 标记
中添加以下代码<activity
android:name="info.androidhive.slidingmenu.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>