我有这个源代码:
package com.ciubotariu.stiaticav1;
/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.util.Random;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.actionbarsherlock.app.SherlockFragmentActivity;
import com.actionbarsherlock.app.SherlockListFragment;
public class MainActivity extends SherlockFragmentActivity {
static final int NUM_ITEMS = 550;
MyAdapter mAdapter;
ViewPager mPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//requestWindowFeature(Window.FEATURE_NO_TITLE);
// getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
// WindowManager.LayoutParams.FLAG_FULLSCREEN);
//getSupportActionBar().setDisplayShowTitleEnabled(false);
//getSupportActionBar().setDisplayShowHomeEnabled(false);
// setContentView(R.layout.fragment_pager);
mAdapter = new MyAdapter(getSupportFragmentManager());
mPager = (ViewPager)findViewById(R.id.pager);
mPager.setAdapter(mAdapter);
// Watch for button clicks.
Button button = (Button)findViewById(R.id.goto_first);
// button.getBackground().setColorFilter(0xFF0174DF, PorterDuff.Mode.MULTIPLY);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mPager.setCurrentItem(0);
}
});
button = (Button)findViewById(R.id.goto_last);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mPager.setCurrentItem(NUM_ITEMS-1);
}
});
button = (Button)findViewById(R.id.goto_random);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Random r = new Random();
int i1=r.nextInt(529)+20;
mPager.setCurrentItem(i1);
}
});
button = (Button)findViewById(R.id.goto_about);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Toast.makeText(MainActivity.this, "Ciuboariu Florin, Ianuarie 2013", Toast.LENGTH_SHORT).show();
}
});
}
public static class MyAdapter extends FragmentPagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
}
@Override
public int getCount() {
return NUM_ITEMS;
}
@Override
public Fragment getItem(int position) {
return ArrayListFragment.newInstance(position);
}
}
public static class ArrayListFragment extends SherlockListFragment {
int mNum;
/**
* Create a new instance of CountingFragment, providing "num"
* as an argument.
*/
static ArrayListFragment newInstance(int num) {
ArrayListFragment f = new ArrayListFragment();
// Supply num input as an argument.
Bundle args = new Bundle();
args.putInt("num", num);
f.setArguments(args);
return f;
}
/**
* When creating, retrieve this instance's number from its arguments.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Random r = new Random();
// int i1=r.nextInt(70-1)+1;
// mNum = i1;
mNum = getArguments() != null ? getArguments().getInt("num") : 1;
}
/**
* The Fragment's UI is just a simple text view showing its
* instance number.
*/
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//View v = inflater.inflate(R.layout.fragment_pager_list, container, false);
//View tv = v.findViewById(R.id.text2);
// switch(mNum){
//IMENSE HERE- deleted
//}
// return v;
View v = inflater.inflate(R.layout.fragment_pager_list, container, false);
View tv = v.findViewById(R.id.text2);
((TextView)tv).setText("Fragment #" + mNum);
return v;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
Log.i("FragmentList", "Item clicked: " + id);
}
}
}
我得到那些错误:
05-31 19:36:43.219: W/dalvikvm(11094): Unable to resolve superclass of Lcom/ciubotariu/stiaticav1/MainActivity; (537)
05-31 19:36:43.219: W/dalvikvm(11094): Link of class 'Lcom/ciubotariu/stiaticav1/MainActivity;' failed
05-31 19:36:43.219: W/dalvikvm(11094): threadid=1: thread exiting with uncaught exception (group=0x40018560)
05-31 19:36:43.229: E/AndroidRuntime(11094): FATAL EXCEPTION: main
05-31 19:36:43.229: E/AndroidRuntime(11094): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.ciubotariu.stiaticav1/com.ciubotariu.stiaticav1.MainActivity}: java.lang.ClassNotFoundException: com.ciubotariu.stiaticav1.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.ciubotariu.stiaticav1-1.apk]
05-31 19:36:43.229: E/AndroidRuntime(11094): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1575)
05-31 19:36:43.229: E/AndroidRuntime(11094): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1669)
05-31 19:36:43.229: E/AndroidRuntime(11094): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
05-31 19:36:43.229: E/AndroidRuntime(11094): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
05-31 19:36:43.229: E/AndroidRuntime(11094): at android.os.Handler.dispatchMessage(Handler.java:99)
05-31 19:36:43.229: E/AndroidRuntime(11094): at android.os.Looper.loop(Looper.java:130)
05-31 19:36:43.229: E/AndroidRuntime(11094): at android.app.ActivityThread.main(ActivityThread.java:3737)
05-31 19:36:43.229: E/AndroidRuntime(11094): at java.lang.reflect.Method.invokeNative(Native Method)
05-31 19:36:43.229: E/AndroidRuntime(11094): at java.lang.reflect.Method.invoke(Method.java:507)
05-31 19:36:43.229: E/AndroidRuntime(11094): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:894)
05-31 19:36:43.229: E/AndroidRuntime(11094): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:652)
05-31 19:36:43.229: E/AndroidRuntime(11094): at dalvik.system.NativeStart.main(Native Method)
05-31 19:36:43.229: E/AndroidRuntime(11094): Caused by: java.lang.ClassNotFoundException: com.ciubotariu.stiaticav1.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.ciubotariu.stiaticav1-1.apk]
05-31 19:36:43.229: E/AndroidRuntime(11094): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
05-31 19:36:43.229: E/AndroidRuntime(11094): at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
05-31 19:36:43.229: E/AndroidRuntime(11094): at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
05-31 19:36:43.229: E/AndroidRuntime(11094): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
05-31 19:36:43.229: E/AndroidRuntime(11094): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1567)
05-31 19:36:43.229: E/AndroidRuntime(11094): ... 11 more
05-31 19:36:43.239: E/AndroidRuntime(11094): [Blue Error Handler] Make Debugging Report file for main
05-31 19:36:43.239: E/AndroidRuntime(11094): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.ciubotariu.stiaticav1/com.ciubotariu.stiaticav1.MainActivity}: java.lang.ClassNotFoundException: com.ciubotariu.stiaticav1.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.ciubotariu.stiaticav1-1.apk]
05-31 19:36:43.239: E/AndroidRuntime(11094): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1575)
05-31 19:36:43.239: E/AndroidRuntime(11094): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1669)
05-31 19:36:43.239: E/AndroidRuntime(11094): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
05-31 19:36:43.239: E/AndroidRuntime(11094): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
05-31 19:36:43.239: E/AndroidRuntime(11094): at android.os.Handler.dispatchMessage(Handler.java:99)
05-31 19:36:43.239: E/AndroidRuntime(11094): at android.os.Looper.loop(Looper.java:130)
05-31 19:36:43.239: E/AndroidRuntime(11094): at android.app.ActivityThread.main(ActivityThread.java:3737)
05-31 19:36:43.239: E/AndroidRuntime(11094): at java.lang.reflect.Method.invokeNative(Native Method)
05-31 19:36:43.239: E/AndroidRuntime(11094): at java.lang.reflect.Method.invoke(Method.java:507)
05-31 19:36:43.239: E/AndroidRuntime(11094): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:894)
05-31 19:36:43.239: E/AndroidRuntime(11094): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:652)
05-31 19:36:43.239: E/AndroidRuntime(11094): at dalvik.system.NativeStart.main(Native Method)
05-31 19:36:43.239: E/AndroidRuntime(11094): Caused by: java.lang.ClassNotFoundException: com.ciubotariu.stiaticav1.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.ciubotariu.stiaticav1-1.apk]
05-31 19:36:43.239: E/AndroidRuntime(11094): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
05-31 19:36:43.239: E/AndroidRuntime(11094): at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
05-31 19:36:43.239: E/AndroidRuntime(11094): at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
05-31 19:36:43.239: E/AndroidRuntime(11094): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
05-31 19:36:43.239: E/AndroidRuntime(11094): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1567)
05-31 19:36:43.239: E/AndroidRuntime(11094): ... 11 more
它在启动时崩溃。
最佳答案
您可能忘记了在AndroidManifest.xml文件中声明MainActivity。