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POAndroid ClassNotFound exception when changing view background
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copied!<p>For my activity, I created a new view and saved it in a public static field. I then set the view with setContentView in the activity. However, whenever I try to change the color of the view from another class, I get a exception as follows: </p> <pre><code>java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.TwinBlade.PicturePassword/com.TwinBlade.PicturePassword.LockActivity}: java.lang.ClassNotFoundException: com.TwinBlade.PicturePassword.LockActivity at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2110) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2229) at android.app.ActivityThread.access$600(ActivityThread.java:139) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1261) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:4945) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.ClassNotFoundException: com.TwinBlade.PicturePassword.LockActivity at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61) at java.lang.ClassLoader.loadClass(ClassLoader.java:501) at java.lang.ClassLoader.loadClass(ClassLoader.java:461) at android.app.Instrumentation.newActivity(Instrumentation.java:1039) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2101) ... 11 more java.lang.ClassNotFoundException: com.TwinBlade.PicturePassword.LockActivity at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61) at java.lang.ClassLoader.loadClass(ClassLoader.java:501) at java.lang.ClassLoader.loadClass(ClassLoader.java:461) at android.app.Instrumentation.newActivity(Instrumentation.java:1039) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2101) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2229) at android.app.ActivityThread.access$600(ActivityThread.java:139) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1261) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:4945) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>UPDATE: </p> <p>Here is what i did in my activity</p> <pre><code>public static View mView; public void onCreate(Bundle savedInstanceState) { mView = new LinearLayout(this); mView.setBackgroundColor(Color.argb(0, 0, 0, 0)); setContentView(mView); } </code></pre> <p>And to change the color of the view from another class:</p> <pre><code>LockActivity.mView.setBackgroundColor(Color.argb(255, 0, 0, 0)); </code></pre> <p>The activity is added in the manifest and can be launched. </p> <p>Any help would be appreciated</p>

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