覆盖 SherlockActivity 时活动崩溃答案

【问题标题】：Activity crashing when overriding SherlockActivity覆盖 SherlockActivity 时活动崩溃
【发布时间】：2013-06-03 15:02:51
【问题描述】：

为什么当我从 SherlockActivity 继承时我的应用程序会崩溃？这可能是一个愚蠢的错误，但我真的想不通！只是从 Activity 继承确实有效。这是代码、布局文件、清单和 logcat 日志：

package com.p4p.joinme;

import android.os.Bundle;

import com.actionbarsherlock.app.SherlockActivity;

public class MainActivity extends SherlockActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
}

布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="I'm a textview." />

</LinearLayout>

清单：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.p4p.joinme"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

错误日志：

06-07 12:03:22.613: E/ExternalAccountType(21992): Unsupported attribute readOnly

06-07 12:03:23.244: E/ExternalAccountType(21992): Unsupported attribute readOnly

06-07 12:03:25.316: E/AndroidRuntime(9285): FATAL EXCEPTION: main

06-07 12:03:25.316: E/AndroidRuntime(9285): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.p4p.joinme/com.p4p.joinme.MainActivity}: java.lang.ClassNotFoundException: com.p4p.joinme.MainActivity

06-07 12:03:25.316: E/AndroidRuntime(9285):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2110)

06-07 12:03:25.316: E/AndroidRuntime(9285):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2229)

06-07 12:03:25.316: E/AndroidRuntime(9285):     at android.app.ActivityThread.access$600(ActivityThread.java:139)

06-07 12:03:25.316: E/AndroidRuntime(9285):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1261)

06-07 12:03:25.316: E/AndroidRuntime(9285):     at android.os.Handler.dispatchMessage(Handler.java:99)

06-07 12:03:25.316: E/AndroidRuntime(9285):     at android.os.Looper.loop(Looper.java:154)

06-07 12:03:25.316: E/AndroidRuntime(9285):     at android.app.ActivityThread.main(ActivityThread.java:4945)

06-07 12:03:25.316: E/AndroidRuntime(9285):     at java.lang.reflect.Method.invokeNative(Native Method)

06-07 12:03:25.316: E/AndroidRuntime(9285):     at java.lang.reflect.Method.invoke(Method.java:511)

06-07 12:03:25.316: E/AndroidRuntime(9285):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)

06-07 12:03:25.316: E/AndroidRuntime(9285):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)

06-07 12:03:25.316: E/AndroidRuntime(9285):     at dalvik.system.NativeStart.main(Native Method)

06-07 12:03:25.316: E/AndroidRuntime(9285): Caused by: java.lang.ClassNotFoundException: com.p4p.joinme.MainActivity
06-07 12:03:25.316: E/AndroidRuntime(9285):     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)

06-07 12:03:25.316: E/AndroidRuntime(9285):     at java.lang.ClassLoader.loadClass(ClassLoader.java:501)

06-07 12:03:25.316: E/AndroidRuntime(9285):     at java.lang.ClassLoader.loadClass(ClassLoader.java:461)

06-07 12:03:25.316: E/AndroidRuntime(9285):     at android.app.Instrumentation.newActivity(Instrumentation.java:1039)

06-07 12:03:25.316: E/AndroidRuntime(9285):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2101)

06-07 12:03:25.316: E/AndroidRuntime(9285):     ... 11 more

06-07 12:03:25.326: E/EmbeddedLogger(239): App crashed! Process: com.p4p.joinme

06-07 12:03:25.326: E/EmbeddedLogger(239): App crashed! Package: com.p4p.joinme v1 (1.0)

06-07 12:03:25.326: E/EmbeddedLogger(239): Application Label: JoinMe!

06-07 12:07:33.959: E/ExternalAccountType(21992): Unsupported attribute readOnly

06-07 12:07:34.299: E/ExternalAccountType(21992): Unsupported attribute readOnly

06-07 12:07:37.452: E/EmbeddedLogger(239): App crashed! Process: com.p4p.joinme

06-07 12:07:37.452: E/EmbeddedLogger(239): App crashed! Package: com.p4p.joinme v1 (1.0)


06-07 12:07:37.452: E/AndroidRuntime(9610): FATAL EXCEPTION: main

06-07 12:07:37.452: E/AndroidRuntime(9610): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.p4p.joinme/com.p4p.joinme.MainActivity}: java.lang.ClassNotFoundException: com.p4p.joinme.MainActivity

06-07 12:07:37.452: E/AndroidRuntime(9610):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2110)

06-07 12:07:37.452: E/AndroidRuntime(9610):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2229)

06-07 12:07:37.452: E/AndroidRuntime(9610):     at android.app.ActivityThread.access$600(ActivityThread.java:139)

06-07 12:07:37.452: E/AndroidRuntime(9610):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1261)

06-07 12:07:37.452: E/AndroidRuntime(9610):     at android.os.Handler.dispatchMessage(Handler.java:99)

06-07 12:07:37.452: E/AndroidRuntime(9610):     at android.os.Looper.loop(Looper.java:154)

06-07 12:07:37.452: E/AndroidRuntime(9610):     at android.app.ActivityThread.main(ActivityThread.java:4945)

06-07 12:07:37.452: E/AndroidRuntime(9610):     at java.lang.reflect.Method.invokeNative(Native Method)

06-07 12:07:37.452: E/AndroidRuntime(9610):     at java.lang.reflect.Method.invoke(Method.java:511)

06-07 12:07:37.452: E/AndroidRuntime(9610):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)

06-07 12:07:37.452: E/AndroidRuntime(9610):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)

06-07 12:07:37.452: E/AndroidRuntime(9610):     at dalvik.system.NativeStart.main(Native Method)

06-07 12:07:37.452: E/AndroidRuntime(9610): Caused by: java.lang.ClassNotFoundException: com.p4p.joinme.MainActivity

06-07 12:07:37.452: E/AndroidRuntime(9610):     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)

06-07 12:07:37.452: E/AndroidRuntime(9610):     at java.lang.ClassLoader.loadClass(ClassLoader.java:501)

06-07 12:07:37.452: E/AndroidRuntime(9610):     at java.lang.ClassLoader.loadClass(ClassLoader.java:461)

06-07 12:07:37.452: E/AndroidRuntime(9610):     at android.app.Instrumentation.newActivity(Instrumentation.java:1039)

06-07 12:07:37.452: E/AndroidRuntime(9610):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2101)

06-07 12:07:37.452: E/AndroidRuntime(9610):     ... 11 more

06-07 12:07:37.472: E/EmbeddedLogger(239): Application Label: JoinMe!

06-07 12:07:38.933: E/ActivityManager(239): fail to set top app changed!

【问题讨论】：

你项目的 Target android 版本是什么？您必须将其设置为 4.0.3 或更高版本
Libraries do not get added to APK anymore after upgrade to ADT 22 的可能重复项

标签： android actionbarsherlock

【解决方案1】：

您可能没有正确链接库，请确保已将其添加到右键单击 -> 属性 -> Android 中的库部分。

【讨论】：

【解决方案2】：

您的代码没有问题。 Jst 与您的库交叉检查它是否已链接到您的项目中。交叉检查的步骤是右键单击项目 -> 属性 -> Android/java 构建路径

【讨论】：

【解决方案3】：

使用下面的代码：

<activity
            android:name="com.p4p.joinme.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

清理您的项目并运行..

【讨论】：

【解决方案4】：

关于外部库我也遇到了同样的问题，可能你的外部库没有导出到你的apk，我建议你看看这个：Could not find class

【讨论】：

谢谢！有一个 actionbarsherlock.jar 未选中，必须检查它。现在可以了！

【解决方案5】：

我不确定这是否与您的错误有关，但如果您想使用 Sherlock Action Bar，您需要使用他们的主题：

<application
    android:allowBackup="false"
    android:icon="@drawable/icon"
    android:label="@string/app_name"
    android:theme="@style/Theme.Sherlock" >

此外，如果您刚刚更新了 ADT 插件，您可能需要检查 Java 构建路径中的私有库。

右键项目->属性->Java Build Path->Order and Export(tab)->激活Andrid Private Libraries旁边的复选框

【讨论】：