我已经阅读了其他人的问题和答案，我似乎无法找到我的答案，所以我要发布我的main.java活动页面和我的android清单文件，如果你看到的东西我我做错了请告诉我。请记住，日食没有错误;当我尝试通过模拟器运行它时它是不通过的，并且无法在主活动上实例化活动组件的错误显示在我的日志cat上。谢谢！
1）main.java：
package com.arthur.sos;
import android.support.v4.app.Fragment;
import java.util.HashMap;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
import android.widget.TabHost;
import android.widget.TabHost.TabContentFactory;
import com.arthur.sos.R;
public class Main extends FragmentActivity implements TabHost.OnTabChangeListener {
private TabHost mTabHost;
private HashMap<String,Object> mapTabInfo = new HashMap<String,Object>();
private TabInfo mLastTab = null;
private class TabInfo {
private String tag;
@SuppressWarnings("rawtypes")
private Class clss;
private Bundle args;
private android.support.v4.app.Fragment fragment;
TabInfo(String tag, @SuppressWarnings("rawtypes") Class clazz, Bundle args) {
this.tag = tag;
this.clss = clazz;
this.args = args;
}
}
class TabFactory implements TabContentFactory {
private final Context mContext;
/**
* @param context
*/
public TabFactory(Context context) {
mContext = context;
}
/**
* @see android.widget.TabHost.TabContentFactory#createTabContent(java.lang.String)
*/
public View createTabContent(String tag) {
View v = new View(mContext);
v.setMinimumWidth(0);
v.setMinimumHeight(0);
return v;
}
}
/**
* @see android.support.v4.app.FragmentActivity#onCreate(android.os.Bundle)
*/
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Step 1: Inflate layout
setContentView(R.layout.tabs_layout);
// Step 2: Setup TabHost
initialiseTabHost(savedInstanceState);
if (savedInstanceState != null) {
mTabHost.setCurrentTabByTag(savedInstanceState.getString("tab")); //set the tab as per the saved state
}
}
/**
* @see android.support.v4.app.FragmentActivity#onSaveInstanceState(android.os.Bundle)
*/
protected void onSaveInstanceState(Bundle outState) {
outState.putString("tab", mTabHost.getCurrentTabTag()); //save the tab selected
super.onSaveInstanceState(outState);
}
/**
* Step 2: Setup TabHost
*/
private void initialiseTabHost(Bundle args) {
mTabHost = (TabHost)findViewById(android.R.id.tabhost);
mTabHost.setup();
TabInfo tabInfo = null;
//This tab is for Vendor Maps, please note .setIndicator is purposely left blank.
Main.addTab(this, this.mTabHost, this.mTabHost.newTabSpec("Tab1").setIndicator("",getResources().getDrawable(R.drawable.map)), ( tabInfo = new TabInfo("Tab1", vendormaps.class, args)));
this.mapTabInfo.put(tabInfo.tag, tabInfo);
//This tab is for Reviews, please note .setIndicator is purposely left blank.
Main.addTab(this, this.mTabHost, this.mTabHost.newTabSpec("Tab2").setIndicator("",getResources().getDrawable(R.drawable.reviews)), ( tabInfo = new TabInfo("Tab2", reviews.class, args)));
this.mapTabInfo.put(tabInfo.tag, tabInfo);
//This tab is for Settings, please note .setIndicator is purposely left blank.
Main.addTab(this, this.mTabHost, this.mTabHost.newTabSpec("Tab3").setIndicator("",getResources().getDrawable(R.drawable.settings)), ( tabInfo = new TabInfo("Tab3", settings.class, args)));
this.mapTabInfo.put(tabInfo.tag, tabInfo);
//This tab is for My Account, please note .setIndicator is purposely left blank.
Main.addTab(this, this.mTabHost, this.mTabHost.newTabSpec("Tab4").setIndicator("",getResources().getDrawable(R.drawable.myaccount)), ( tabInfo = new TabInfo("Tab4", myaccount.class, args)));
this.mapTabInfo.put(tabInfo.tag, tabInfo);
// Default to first tab
this.onTabChanged("Tab1");
//
mTabHost.setOnTabChangedListener(this);
}
/**
* @param activity
* @param tabHost
* @param tabSpec
* @param clss
* @param args
*/
private static void addTab(Main activity, TabHost tabHost, TabHost.TabSpec tabSpec, TabInfo tabInfo) {
// Attach a Tab view factory to the spec
tabSpec.setContent(activity.new TabFactory(activity));
String tag = tabSpec.getTag();
// Check to see if we already have a fragment for this tab, probably
// from a previously saved state. If so, deactivate it, because our
// initial state is that a tab isn't shown.
tabInfo.fragment = activity.getSupportFragmentManager().findFragmentByTag(tag);
if (tabInfo.fragment != null && !tabInfo.fragment.isDetached()) {
FragmentTransaction ft = activity.getSupportFragmentManager().beginTransaction();
ft.detach(tabInfo.fragment);
ft.commit();
activity.getSupportFragmentManager().executePendingTransactions();
}
tabHost.addTab(tabSpec);
}
/** (non-Javadoc)
* @see android.widget.TabHost.OnTabChangeListener#onTabChanged(java.lang.String)
*/
public void onTabChanged(String tag) {
TabInfo newTab = (TabInfo) this.mapTabInfo.get(tag);
if (mLastTab != newTab) {
FragmentTransaction ft = this.getSupportFragmentManager().beginTransaction();
if (mLastTab != null) {
if (mLastTab.fragment != null) {
ft.detach(mLastTab.fragment);
}
}
if (newTab != null) {
if (newTab.fragment == null) {
newTab.fragment = Fragment.instantiate(this,
newTab.clss.getName(), newTab.args);
ft.add(R.id.realtabcontent, newTab.fragment, newTab.tag);
} else {
ft.attach(newTab.fragment);
}
}
mLastTab = newTab;
ft.commit();
this.getSupportFragmentManager().executePendingTransactions();
}
}
}
2）Android Manifest.xml：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.arthur.sos"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="17"/>
<permission
android:name="com.arthur.sos.permission.MAPS_RECEIVE"
android:protectionLevel="signature" />
<uses-permission android:name="com.arthur.sos.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />
<application
android:allowBackup="true"
android:icon="@drawable/rmcsos"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.arthur.sos.Main"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="certificate area" />
</application>
</manifest>
3）Activity_Main.xml：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".Main" >
</RelativeLayout>
4）google地图首先位于XML文件vendormaps.xml：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<selector>
<!-- When selected -->
<item android:drawable="@drawable/map"
android:state_selected="true" />
<!-- When not selected -->
<item android:drawable="@drawable/map_inactive"/>
</selector>
<fragment
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.MapFragment" />
</RelativeLayout>
5）现在活动，vendormaps.java：
package com.arthur.sos;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
//import android.app.Activity;
import android.view.Menu;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.arthur.sos.R;
public class vendormaps extends FragmentActivity {
static final LatLng Whittier = new LatLng(33.9417909, -117.9861795);
// static final LatLng KIEL = new LatLng(53.551, 9.993);
private GoogleMap map;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
.getMap();
@SuppressWarnings("unused")
Marker W1 = map.addMarker(new MarkerOptions().position(Whittier).title("Whittier").snippet("Re/Max").icon(BitmapDescriptorFactory.
fromResource(R.drawable.rmcsos)));
// Marker kiel = map.addMarker(new MarkerOptions()
//.title("Kiel")
//.snippet("Kiel is cool")
// .icon(BitmapDescriptorFactory
// .fromResource(R.drawable.ic_launcher)));
// Move the camera instantly to hamburg with a zoom of 15.
map.moveCamera(CameraUpdateFactory.newLatLngZoom(Whittier, 15));
// Zoom in, animating the camera.
map.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (container == null) {
return null;
}
return (LinearLayout)inflater.inflate(R.layout.vendormaps, container, false);
}
}
6）现在logcat错误：
05-16 06:43:15.068: E/AndroidRuntime(2064): FATAL EXCEPTION: main
05-16 06:43:15.068: E/AndroidRuntime(2064): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.arthur.sos/com.arthur.sos.Main}: java.lang.ClassNotFoundException: com.arthur.sos.Main
05-16 06:43:15.068: E/AndroidRuntime(2064): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1879)
05-16 06:43:15.068: E/AndroidRuntime(2064): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)
05-16 06:43:15.068: E/AndroidRuntime(2064): at android.app.ActivityThread.access$600(ActivityThread.java:122)
05-16 06:43:15.068: E/AndroidRuntime(2064): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146)
05-16 06:43:15.068: E/AndroidRuntime(2064): at android.os.Handler.dispatchMessage(Handler.java:99)
05-16 06:43:15.068: E/AndroidRuntime(2064): at android.os.Looper.loop(Looper.java:137)
05-16 06:43:15.068: E/AndroidRuntime(2064): at android.app.ActivityThread.main(ActivityThread.java:4340)
05-16 06:43:15.068: E/AndroidRuntime(2064): at java.lang.reflect.Method.invokeNative(Native Method)
05-16 06:43:15.068: E/AndroidRuntime(2064): at java.lang.reflect.Method.invoke(Method.java:511)
05-16 06:43:15.068: E/AndroidRuntime(2064): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
05-16 06:43:15.068: E/AndroidRuntime(2064): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
05-16 06:43:15.068: E/AndroidRuntime(2064): at dalvik.system.NativeStart.main(Native Method)
05-16 06:43:15.068: E/AndroidRuntime(2064): Caused by: java.lang.ClassNotFoundException: com.arthur.sos.Main
05-16 06:43:15.068: E/AndroidRuntime(2064): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
05-16 06:43:15.068: E/AndroidRuntime(2064): at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
05-16 06:43:15.068: E/AndroidRuntime(2064): at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
05-16 06:43:15.068: E/AndroidRuntime(2064): at android.app.Instrumentation.newActivity(Instrumentation.java:1023)
05-16 06:43:15.068: E/AndroidRuntime(2064): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1870)
05-16 06:43:15.068: E/AndroidRuntime(2064): ... 11 more
答案 0 :(得分：0)
您的错误是：
Caused by: java.lang.ClassNotFoundException: com.arthur.sos.Main
因此，在项目中找到Main类时会出现问题。
尝试从以下位置更改清单文件中的活动：
<activity
android:name="com.arthur.sos.Main"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
对此：
<activity
android:name=".Main"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
答案 1 :(得分：0)
由于您在应用中使用Gmaps，请确保您的模拟器支持 Google Api ... thr是一个单独的平台，您必须下载以支持Google Apis。所以请确保您拥有该功能。使用支持Google Api作为目标os的平台运行模拟器