Java 无法启动活动-组件信息错误

这是我在尝试启动应用程序时遇到的错误。 有人能看出我做错了什么吗

日志猫

11-19 14:01:39.993: E/AndroidRuntime(4046): FATAL EXCEPTION: main

11-19 14:01:39.993: E/AndroidRuntime(4046): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.zimzux.soundapprhk/com.zimzux.soundapprhk.Start}: java.lang.NullPointerException

11-19 14:01:39.993: E/AndroidRuntime(4046):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at android.app.ActivityThread.access$600(ActivityThread.java:123)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at android.os.Handler.dispatchMessage(Handler.java:99)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at android.os.Looper.loop(Looper.java:137)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at android.app.ActivityThread.main(ActivityThread.java:4424)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at java.lang.reflect.Method.invokeNative(Native Method)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at java.lang.reflect.Method.invoke(Method.java:511)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at dalvik.system.NativeStart.main(Native Method)

11-19 14:01:39.993: E/AndroidRuntime(4046): Caused by: java.lang.NullPointerException

11-19 14:01:39.993: E/AndroidRuntime(4046):     at com.zimzux.soundapprhk.Start.onCreate(Start.java:269)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at android.app.Activity.performCreate(Activity.java:4492)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)

11-19 14:01:39.993: E/AndroidRuntime(4046):     ... 11 more

11-19 14:01:40.213: I/dalvikvm(4046): threadid=3: reacting to signal 3

11-19 14:01:40.213: I/dalvikvm(4046): Wrote stack traces to '/data/anr/traces.txt'

11-19 14:01:40.503: I/dalvikvm(4046): threadid=3: reacting to signal 3

11-19 14:01:40.513: I/dalvikvm(4046): Wrote stack traces to '/data/anr/traces.txt'

11-19 14:02:38.883: I/Process(4046): Sending signal. PID: 4046 SIG: 9

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.zimzux.soundapprhk"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="11"
        android:targetSdkVersion="18" />

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

        <activity
            android:name=".Opstart"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="com.zimzux.soundapprhk.OPSTART" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".Start"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="com.zimzux.soundapprhk.MAIN" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>


    </application>
</manifest>

这是我的清单

11-19 14:01:39.993: E/AndroidRuntime(4046): FATAL EXCEPTION: main

11-19 14:01:39.993: E/AndroidRuntime(4046): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.zimzux.soundapprhk/com.zimzux.soundapprhk.Start}: java.lang.NullPointerException

11-19 14:01:39.993: E/AndroidRuntime(4046):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at android.app.ActivityThread.access$600(ActivityThread.java:123)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at android.os.Handler.dispatchMessage(Handler.java:99)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at android.os.Looper.loop(Looper.java:137)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at android.app.ActivityThread.main(ActivityThread.java:4424)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at java.lang.reflect.Method.invokeNative(Native Method)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at java.lang.reflect.Method.invoke(Method.java:511)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at dalvik.system.NativeStart.main(Native Method)

11-19 14:01:39.993: E/AndroidRuntime(4046): Caused by: java.lang.NullPointerException

11-19 14:01:39.993: E/AndroidRuntime(4046):     at com.zimzux.soundapprhk.Start.onCreate(Start.java:269)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at android.app.Activity.performCreate(Activity.java:4492)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)

11-19 14:01:39.993: E/AndroidRuntime(4046):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)

11-19 14:01:39.993: E/AndroidRuntime(4046):     ... 11 more

11-19 14:01:40.213: I/dalvikvm(4046): threadid=3: reacting to signal 3

11-19 14:01:40.213: I/dalvikvm(4046): Wrote stack traces to '/data/anr/traces.txt'

11-19 14:01:40.503: I/dalvikvm(4046): threadid=3: reacting to signal 3

11-19 14:01:40.513: I/dalvikvm(4046): Wrote stack traces to '/data/anr/traces.txt'

11-19 14:02:38.883: I/Process(4046): Sending signal. PID: 4046 SIG: 9

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.zimzux.soundapprhk"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="11"
        android:targetSdkVersion="18" />

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

        <activity
            android:name=".Opstart"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="com.zimzux.soundapprhk.OPSTART" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".Start"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="com.zimzux.soundapprhk.MAIN" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>


    </application>
</manifest>

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错误发生在第269行？ 我无法确定这是哪一行，因为您在开始活动中提供了135行

然而，我猜想您的findViewById方法正在寻找一个不存在的资源。检查xml fine是否包含活动中引用的所有按钮/线性布局/图像视图等

---

如果不是这样，那么您需要将按钮等声明为类变量，然后在oncreate方法中初始化它们，从而允许访问其他方法和内部类

我已经检查了代码，但是行num不正确，这个错误的原因非常清楚，findViewById没有找到id的视图，请重新检查您的代码在

Start.java

中的

行269

是什么，这就是为什么您在类的开头声明和初始化类变量。所以你的方法中永远不会出现空值。它提供了一个潜在的解决方案，不是吗？