android.content.ActivityNotFoundException,无法启动活动

时间:2013-05-24 16:09:50

标签: android android-activity android-manifest activitynotfoundexception

我的应用程序清单有问题。 单击主要活动上的按钮我想启动另一个活动,所以我使用了这个功能:

public void startDatacenters() {
    Intent intent = new Intent(context, Datacenters.class);
    activity.startActivity(intent);}

Datacenters.class包是com.eco4cloud.activities.Datacenters

所以我的表现就是这样:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.eco4cloud"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

        <activity
            android:name=".activities.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>

        <activity
            android:name=".activities.Datacenters"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="com.eco4cloud.activities.DATACENTERS" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
</application>

</manifest>

Android给了我这个错误,我不知道为什么:(

  

05-24 18:01:32.622:D / AndroidRuntime(15404):关闭VM   05-24 18:01:32.622:W / dalvikvm(15404):threadid = 1:线程退出,未捕获异常(group = 0x40a441f8)   05-24 18:01:32.632:E / AndroidRuntime(15404):致命异常:主要   05-24 18:01:32.632:E / AndroidRuntime(15404):java.lang.RuntimeException:无法启动活动ComponentInfo {com.eco4cloud / com.eco4cloud.activities.Main}:android.content.ActivityNotFoundException:无法找到显式活动类{com.eco4cloud / com.eco4cloud.activities.Datacenters};你有没有在AndroidManifest.xml中声明这个活动?   05-24 18:01:32.632:E / AndroidRuntime(15404):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2079)   05-24 18:01:32.632:E / AndroidRuntime(15404):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2104)   05-24 18:01:32.632:E / AndroidRuntime(15404):在android.app.ActivityThread.access $ 600(ActivityThread.java:132)   05-24 18:01:32.632:E / AndroidRuntime(15404):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1157)   05-24 18:01:32.632:E / AndroidRuntime(15404):在android.os.Handler.dispatchMessage(Handler.java:99)   05-24 18:01:32.632:E / AndroidRuntime(15404):在android.os.Looper.loop(Looper.java:137)   05-24 18:01:32.632:E / AndroidRuntime(15404):在android.app.ActivityThread.main(ActivityThread.java:4575)   05-24 18:01:32.632:E / AndroidRuntime(15404):at java.lang.reflect.Method.invokeNative(Native Method)   05-24 18:01:32.632:E / AndroidRuntime(15404):at java.lang.reflect.Method.invoke(Method.java:511)   05-24 18:01:32.632:E / AndroidRuntime(15404):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:789)   05-24 18:01:32.632:E / AndroidRuntime(15404):at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)   05-24 18:01:32.632:E / AndroidRuntime(15404):at dalvik.system.NativeStart.main(Native Method)   05-24 18:01:32.632:E / AndroidRuntime(15404):引起:android.content.ActivityNotFoundException:无法找到显式活动类{com.eco4cloud / com.eco4cloud.activities.Datacenters};你有没有在AndroidManifest.xml中声明这个活动?   05-24 18:01:32.632:E / AndroidRuntime(15404):在android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1508)   05-24 18:01:32.632:E / AndroidRuntime(15404):在android.app.Instrumentation.execStartActivity(Instrumentation.java:1384)   05-24 18:01:32.632:E / AndroidRuntime(15404):在android.app.Activity.startActivityForResult(Activity.java:3190)   05-24 18:01:32.632:E / AndroidRuntime(15404):在android.app.Activity.startActivity(Activity.java:3297)   05-24 18:01:32.632:E / AndroidRuntime(15404):at com.eco4cloud.controllers.MainController.startDatacenters(MainController.java:46)   05-24 18:01:32.632:E / AndroidRuntime(15404):at com.eco4cloud.activities.Main.verifyAndSignIn(Main.java:117)   05-24 18:01:32.632:E / AndroidRuntime(15404):at com.eco4cloud.activities.Main.onCreate(Main.java:53)   05-24 18:01:32.632:E / AndroidRuntime(15404):在android.app.Activity.performCreate(Activity.java:4465)   05-24 18:01:32.632:E / AndroidRuntime(15404):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)   05-24 18:01:32.632:E / AndroidRuntime(15404):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2033)   05-24 18:01:32.632:E / AndroidRuntime(15404):... 11 more

有人可以帮帮我吗? 我不知道问题是关于包名还是其他东西:(

3 个答案:

答案 0 :(得分:3)

我不确定你要做什么。

但要提出几点建议。

    package="com.eco4cloud.activities" 
    // make sure package name is right.
    // probably it should be as above. 

如上所述提及包名称

由于您有明确的意图,因此不需要使用intent-filter

      // use this assuming Datacenters is in package com.eco4cloud.activities
      // also assuming package="com.eco4cloud.activities"
      <activity
        android:name=".Datacenters" 
        android:label="@string/app_name" >
    </activity>

如果package =“com.eco4cloud”,请尝试以下

       <activity
        android:name="com.eco4cloud.activities.Datacenters" 
        android:label="@string/app_name" >
    </activity> 

如果您要在非活动类中开始活动

     public void startDatacenters() {
     Intent intent = new Intent(context, Datacenters.class);
     // assuming context is the activity content  
     context.startActivity(intent);
     //in your case you have activity.startActivity(intent)
     // not sure what activity is 
    }

答案 1 :(得分:0)

尝试在应用清单“com.eco4cloud.activities.Datacenters”中提供活动的完全限定名称,而不仅仅是“.activities.Datacenters”

答案 2 :(得分:0)

你可以这样使用

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.eco4cloud"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

        <activity
            android:name="com.eco4cloud.activities.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>

        <activity
            android:name="com.eco4cloud.activities.Datacenters"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="com.eco4cloud.activities.DATACENTERS" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
</application>

</manifest>