Question

获取活动vTestSession无法启动的错误，可能是因为它不在AndroidManifest.xml中。但它就在那里。

LogCat错误

08-12 18:39:14.871: E/AndroidRuntime(987): FATAL EXCEPTION: main
08-12 18:39:14.871: E/AndroidRuntime(987): java.lang.IllegalStateException: Could not execute method of the activity
08-12 18:39:14.871: E/AndroidRuntime(987):  at android.view.View$1.onClick(View.java:3591)
08-12 18:39:14.871: E/AndroidRuntime(987):  at android.view.View.performClick(View.java:4084)
08-12 18:39:14.871: E/AndroidRuntime(987):  at android.view.View$PerformClick.run(View.java:16966)
08-12 18:39:14.871: E/AndroidRuntime(987):  at android.os.Handler.handleCallback(Handler.java:615)
08-12 18:39:14.871: E/AndroidRuntime(987):  at android.os.Handler.dispatchMessage(Handler.java:92)
08-12 18:39:14.871: E/AndroidRuntime(987):  at android.os.Looper.loop(Looper.java:137)
08-12 18:39:14.871: E/AndroidRuntime(987):  at android.app.ActivityThread.main(ActivityThread.java:4745)
08-12 18:39:14.871: E/AndroidRuntime(987):  at java.lang.reflect.Method.invokeNative(Native Method)
08-12 18:39:14.871: E/AndroidRuntime(987):  at java.lang.reflect.Method.invoke(Method.java:511)
08-12 18:39:14.871: E/AndroidRuntime(987):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
08-12 18:39:14.871: E/AndroidRuntime(987):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
08-12 18:39:14.871: E/AndroidRuntime(987):  at dalvik.system.NativeStart.main(Native Method)
08-12 18:39:14.871: E/AndroidRuntime(987): Caused by: java.lang.reflect.InvocationTargetException
08-12 18:39:14.871: E/AndroidRuntime(987):  at java.lang.reflect.Method.invokeNative(Native Method)
08-12 18:39:14.871: E/AndroidRuntime(987):  at java.lang.reflect.Method.invoke(Method.java:511)
08-12 18:39:14.871: E/AndroidRuntime(987):  at android.view.View$1.onClick(View.java:3586)
08-12 18:39:14.871: E/AndroidRuntime(987):  ... 11 more
08-12 18:39:14.871: E/AndroidRuntime(987): Caused by: java.lang.NullPointerException
08-12 18:39:14.871: E/AndroidRuntime(987):  at com.kids.playground.math.vTestSession.getcurrentquestion(vTestSession.java:312)
08-12 18:39:14.871: E/AndroidRuntime(987):  at com.kids.playground.math.vTestSession.setuparun(vTestSession.java:132)
08-12 18:39:14.871: E/AndroidRuntime(987):  at com.kids.playground.math.vTestSession.ans1clicked(vTestSession.java:342)
08-12 18:39:14.871: E/AndroidRuntime(987):  ... 14 more

我在com.kids.playground包中有一个带有按钮的类。单击该按钮时，它将在com.kids.playground.math包中运行

enter image description here

我的AndroidManifest.xml

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

    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="10" />

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

    <application 
        android:icon="@drawable/icon" 
        android:label="@string/app_name" >
         <activity
            android:label="@string/app_name"
            android:name=".AppActivity" >
            <intent-filter >
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>


           <activity android:name="com.kids.playground.math.DMG"
                  android:label="@string/app_name">
        </activity>

        <activity android:name="com.kids.playground.math.vSplash"
                  android:theme="@style/Theme.Transparent">
        </activity>

        <activity android:name="com.kids.playground.math.vTestSession"
                  android:label="@string/app_name">
        </activity>

        <activity android:name="com.kids.playground.math.vStats"
                  android:label="@string/app_name">
        </activity>

        <activity android:name="com.kids.playground.math.vHistoryStats"
                  android:label="@string/app_name">
        </activity>

        <activity android:name="com.kids.playground.math.vEasystats"
                  android:label="@string/app_name">
        </activity>

        <activity android:name="com.kids.playground.math.vNormalstats"
                  android:label="@string/app_name">
        </activity>

        <activity android:name="com.kids.playground.math.vHardstats"
                  android:label="@string/app_name">
        </activity>


        <receiver android:name="com.kids.playground.math.MyIntentReceiver" android:enabled="true">
            <intent-filter>
                <action android:name="com.kids.playground.math.PrepareOperationSet" />
            </intent-filter>
        </receiver>


        </application>

</manifest>

编辑 - 第306-317行

 @SuppressWarnings("unchecked")
    private ArrayList<String> getcurrentquestion() {
        ArrayList<String> retval = new ArrayList<String>();
        Random r = new Random();

        //Check if the current index is not over size of question set and maximum number of questions then return null
        if( vTestSession.currentindex > this.numquestions-1 || vTestSession.currentindex > this.questions.size()-1) { return null; }

        int qindex = r.nextInt(this.questions.size());
        retval = (ArrayList<String>) this.questions.get(qindex);
        return retval;
    }

第312行是注释下的if语句＆＃34; //检查当前索引是否...＆＃34;

Answer 1

您需要调试并且必须检查在if条件中使用的所有变量的值。在这里，您需要验证所有变量是否包含预期值而不是空值。你也可以按照以下方式进行操作。

将断点放在第312行
调试您的应用程序并让断点触发
只需在变量上获取鼠标指针即可获得变量
的值或者
右键单击变量名称并选择Inspect

我希望这会对你有帮助......

Answer 2

调试并告诉我们此行中所有变量的值。其中一个（或多个）将为空。如果你发现原因，你的问题就解决了。

很可能你没有在之前的代码中初始化它们。

即使它在那里，活动不在AndroidManifest.xml中也是错误的

2 个答案: