Question

我将使用ActionBarSherlock开发Android NavigationDrawer。我的Manifest API级别是8.我使用了Sherlock的所有软件包，但我仍然面临一些恼人的错误。

JAVA代码 - ：

package com.example.android.navigationdrawerexample;

import java.util.Locale;

import com.actionbarsherlock.app.SherlockActivity;
import com.actionbarsherlock.app.SherlockFragment;
import com.actionbarsherlock.app.SherlockFragmentActivity;

import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
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.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.view.LayoutInflater;
import android.view.View;

import com.actionbarsherlock.view.Menu;
import com.actionbarsherlock.view.MenuItem;
import com.actionbarsherlock.view.MenuInflater;

import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends SherlockFragmentActivity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;

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

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mTitle = mDrawerTitle = getTitle();
    mPlanetTitles = getResources().getStringArray(R.array.planets_array);
    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    mDrawerList = (ListView) findViewById(R.id.left_drawer);

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

    // enable ActionBar app icon to behave as action to toggle nav drawer


      getSupportActionBar().setDisplayHomeAsUpEnabled(true);

      getSupportActionBar().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_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) {
            supportInvalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
        }

        public void onDrawerOpened(View drawerView) {
            supportInvalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
        }
    };
    mDrawerLayout.setDrawerListener(mDrawerToggle);

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

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getSupportMenuInflater();
    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 = mDrawerLayout.isDrawerOpen(mDrawerList);
    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.

    // 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, getSupportActionBar().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);
    }
}

/* 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) {
    // update the main content by replacing fragments
    SherlockFragment fragment = new PlanetFragment();
    Bundle args = new Bundle();
    args.putInt(PlanetFragment.ARG_PLANET_NUMBER, position);
    fragment.setArguments(args);

    android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
    android.support.v4.app.FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();


    fragmentTransaction.replace(R.id.content_frame, fragment).commit();

    // update selected item and title, then close the drawer
    mDrawerList.setItemChecked(position, true);
    setTitle(mPlanetTitles[position]);
    mDrawerLayout.closeDrawer(mDrawerList);
}

@Override
public void setTitle(CharSequence title) {
    mTitle = title;
    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);
}

/**
 * Fragment that appears in the "content_frame", shows a planet
 */
public static class PlanetFragment extends SherlockFragment {
    public static final String ARG_PLANET_NUMBER = "planet_number";


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_planet, container, false);
        int i = getArguments().getInt(ARG_PLANET_NUMBER);
        String planet = getResources().getStringArray(R.array.planets_array)[i];

        int imageId = getResources().getIdentifier(planet.toLowerCase(Locale.getDefault()),
                        "drawable", getActivity().getPackageName());
        ((ImageView) rootView.findViewById(R.id.image)).setImageResource(imageId);
        getActivity().setTitle(planet);
        return rootView;
    }
}}

清单文件 - ：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.android.navigationdrawerexample"
android:versionCode="1"
android:versionName="1.0">

<uses-sdk android:minSdkVersion="8" android:targetSdkVersion="16" />

<application
    android:label="@string/app_name"
    android:icon="@drawable/ic_launcher">

    <activity
        android:name=".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>

</application>

面临错误 - ：

03-05 22：56：52.289：E / AndroidRuntime（13066）：

FATAL EXCEPTION: main
03-05 22:56:52.289: E/AndroidRuntime(13066): java.lang.RuntimeException: Unable to     instantiate activity ComponentInfo{com.example.android.navigationdrawerexample/com.example.android.navigationdrawerexample.MainActivity}: java.lang.ClassNotFoundException: com.example.android.navigationdrawerexample.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.android.navigationdrawerexample-2.apk]
03-05 22:56:52.289: E/AndroidRuntime(13066):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1573)
03-05 22:56:52.289: E/AndroidRuntime(13066):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
03-05 22:56:52.289: E/AndroidRuntime(13066):    at android.app.ActivityThread.access$1500(ActivityThread.java:117)
03-05 22:56:52.289: E/AndroidRuntime(13066):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
03-05 22:56:52.289: E/AndroidRuntime(13066):    at android.os.Handler.dispatchMessage(Handler.java:99)
03-05 22:56:52.289: E/AndroidRuntime(13066):    at android.os.Looper.loop(Looper.java:130)
03-05 22:56:52.289: E/AndroidRuntime(13066):    at android.app.ActivityThread.main(ActivityThread.java:3687)
03-05 22:56:52.289: E/AndroidRuntime(13066):    at java.lang.reflect.Method.invokeNative(Native Method)
03-05 22:56:52.289: E/AndroidRuntime(13066):    at java.lang.reflect.Method.invoke(Method.java:507)
03-05 22:56:52.289: E/AndroidRuntime(13066):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
03-05 22:56:52.289: E/AndroidRuntime(13066):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
03-05 22:56:52.289: E/AndroidRuntime(13066):    at dalvik.system.NativeStart.main(Native Method)
03-05 22:56:52.289: E/AndroidRuntime(13066): 

Caused by: java.lang.ClassNotFoundException: com.example.android.navigationdrawerexample.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.android.navigationdrawerexample-2.apk]
03-05 22:56:52.289: E/AndroidRuntime(13066):    at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
03-05 22:56:52.289: E/AndroidRuntime(13066):    at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
03-05 22:56:52.289: E/AndroidRuntime(13066):    at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
03-05 22:56:52.289: E/AndroidRuntime(13066):    at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
03-05 22:56:52.289: E/AndroidRuntime(13066):    at     android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1565)
    03-05 22:56:52.289: E/AndroidRuntime(13066):    ... 11 more

这是我在错误中遇到的上述错误。 Logcat 中的错误也不清楚。请提供一些解决方案，以便我可以为API Level 8或较旧的Android版本开发NavigationDrawer。

Answer 1

Caused by: java.lang.ClassNotFoundException: com.example.android.navigationdrawerexample.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.android.navigationdrawerexample-2.apk]

这可能是你的清单问题。请将您的MainActivity添加到AndroidManifest.xml。检查包名称和其他属性（如果已添加）。

然后清理你的项目。转到Eclipse菜单中的Project选项卡，然后单击clean。

如何使用ActionBarSherlock为API Level 8开发Android导航抽屉？

1 个答案: