你好,我是一个新手,正在学习安卓开发并且已经创建了两个项目。
现在,我希望在第一个项目中点击一个按钮后可以调用第二个项目中的活动。
第一个项目仅处理登录界面,当我点击登录按钮时,需要调用第二个项目中存在的一个活动。
我在网上搜索了一下,但没有找到任何我理解得很好的教程。
你好,我遇到了以下错误。
01-30 08:36:47.230: E/dalvikvm(3408): Could not find class 'com.androidhive.googleplacesandmaps.MainActivity', referenced from method org.fluturasymphony.recommendation.LoginActivity$DownloadWebPageTask.doInBackground
01-30 08:36:52.587: E/AndroidRuntime(3408): FATAL EXCEPTION: AsyncTask #1
01-30 08:36:52.587: E/AndroidRuntime(3408): java.lang.RuntimeException: An error occured while executing doInBackground()
01-30 08:36:52.587: E/AndroidRuntime(3408): at android.os.AsyncTask$3.done(AsyncTask.java:299)
01-30 08:36:52.587: E/AndroidRuntime(3408): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
01-30 08:36:52.587: E/AndroidRuntime(3408): at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
01-30 08:36:52.587: E/AndroidRuntime(3408): at java.util.concurrent.FutureTask.run(FutureTask.java:239)
01-30 08:36:52.587: E/AndroidRuntime(3408): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
01-30 08:36:52.587: E/AndroidRuntime(3408): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
01-30 08:36:52.587: E/AndroidRuntime(3408): at java.lang.Thread.run(Thread.java:856)
01-30 08:36:52.587: E/AndroidRuntime(3408): Caused by: java.lang.NoClassDefFoundError: com.androidhive.googleplacesandmaps.MainActivity
01-30 08:36:52.587: E/AndroidRuntime(3408): at org.fluturasymphony.recommendation.LoginActivity$DownloadWebPageTask.doInBackground(LoginActivity.java:69)
01-30 08:36:52.587: E/AndroidRuntime(3408): at org.fluturasymphony.recommendation.LoginActivity$DownloadWebPageTask.doInBackground(LoginActivity.java:1)
01-30 08:36:52.587: E/AndroidRuntime(3408): at android.os.AsyncTask$2.call(AsyncTask.java:287)
01-30 08:36:52.587: E/AndroidRuntime(3408): at java.util.concurrent.FutureTask.run(FutureTask.java:234)
01-30 08:36:52.587: E/AndroidRuntime(3408): ... 3 more
我已将清单声明为以下内容。
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="org.fluturasymphony.recommendation"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="9"
android:targetSdkVersion="11" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<application android:icon="@drawable/ic_launcher" android:label="@string/app_name">
<activity android:label="@string/app_name" android:name=".LoginActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="org.achartengine.GraphicalActivity" />
<activity android:name=".CategoryWiseSalesChartActivity" />
<activity android:name=".ProductWiseSalesChartActivity" />
<activity android:name="com.androidhive.googleplacesandmaps.MainActivity"/>
<activity android:label="@string/home_screen" android:name=".HomeActivity" android:configChanges="orientation">
</activity>
<activity android:label="@string/store_screen" android:name=".StoreActivity" android:configChanges="orientation">
</activity>
<activity android:label="@string/store_list_screen" android:name=".StoreListActivity" android:configChanges="orientation">
</activity>
<activity android:label="@string/location_screen" android:name=".StoreMapActivity" android:configChanges="orientation">
</activity>
<activity android:label="@string/recommended_products_list_screen" android:name=".RecommendedProductsListActivity" android:configChanges="orientation">
</activity>
<activity android:label="@string/category_wise_sales_screen" android:name=".CategoryWiseSalesActivity" android:configChanges="orientation">
</activity>
<activity android:label="@string/product_wise_sales_screen" android:name=".ProductWiseSalesActivity" android:configChanges="orientation">
</activity>
<uses-library android:name="com.google.android.maps" />
</application>
</manifest>
我正在第二个类中这样调用活动。
Intent loginintent = new Intent("com.androidhive.googleplacesandmaps.MainActivity");
startActivity(loginintent);
这个对吗?