当我单击应用程序抽屉按钮时，Android 启动器崩溃

Question

您好，我正在开发一个 android 启动器，一切都在我的 faea f2 上运行，但是当我尝试在我的 faea f1 和 moto atrix 4g 上运行它时，当我单击应用程序抽屉按钮时，启动器崩溃 LogCat 显示此错误：

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.d4a.tobiasuil2/com.guillaumecendre.android.launcher.Main}: java.lang.NullPointerException

这是完整的逻辑日志：

    01-01 18:18:30.778: E/PhonePolicy(4746): Could not preload class for phone policy: com.android.internal.policy.impl.PhoneWindow$ContextMenuCallback
01-01 18:18:37.237: E/Click event(4746): Home button tapped
01-01 18:18:37.837: E/AndroidRuntime(4746): FATAL EXCEPTION: main
01-01 18:18:37.837: E/AndroidRuntime(4746): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.d4a.tobiasuil2/com.guillaumecendre.android.launcher.Main}: java.lang.NullPointerException
01-01 18:18:37.837: E/AndroidRuntime(4746):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2077)
01-01 18:18:37.837: E/AndroidRuntime(4746):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2102)
01-01 18:18:37.837: E/AndroidRuntime(4746):     at android.app.ActivityThread.access$600(ActivityThread.java:133)
01-01 18:18:37.837: E/AndroidRuntime(4746):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1198)
01-01 18:18:37.837: E/AndroidRuntime(4746):     at android.os.Handler.dispatchMessage(Handler.java:99)
01-01 18:18:37.837: E/AndroidRuntime(4746):     at android.os.Looper.loop(Looper.java:137)
01-01 18:18:37.837: E/AndroidRuntime(4746):     at android.app.ActivityThread.main(ActivityThread.java:4765)
01-01 18:18:37.837: E/AndroidRuntime(4746):     at java.lang.reflect.Method.invokeNative(Native Method)
01-01 18:18:37.837: E/AndroidRuntime(4746):     at java.lang.reflect.Method.invoke(Method.java:511)
01-01 18:18:37.837: E/AndroidRuntime(4746):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
01-01 18:18:37.837: E/AndroidRuntime(4746):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
01-01 18:18:37.837: E/AndroidRuntime(4746):     at dalvik.system.NativeStart.main(Native Method)
01-01 18:18:37.837: E/AndroidRuntime(4746): Caused by: java.lang.NullPointerException
01-01 18:18:37.837: E/AndroidRuntime(4746):     at com.guillaumecendre.android.launcher.Main.doLayout(Main.java:1207)
01-01 18:18:37.837: E/AndroidRuntime(4746):     at com.guillaumecendre.android.launcher.Main.onCreate(Main.java:261)
01-01 18:18:37.837: E/AndroidRuntime(4746):     at android.app.Activity.performCreate(Activity.java:5024)
01-01 18:18:37.837: E/AndroidRuntime(4746):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
01-01 18:18:37.837: E/AndroidRuntime(4746):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2041)
01-01 18:18:37.837: E/AndroidRuntime(4746):     ... 11 more

Main.java //代码太大，无法发布，所以这里有一个通过 Drive 的链接：

https://docs.google.com/document/d/15xlQ3nZ0b1pBq82xopcq-htEWAmrRnqQDY5uX8gabqM/edit?usp=sharing

任何帮助都会很棒

提前感谢！

D3vs4apps

Answer 1

在您的代码中，您正在这样做：

View v = null;

cva = new CustomViewAdapter(this, 0, apps, Settings.font, Settings.font_color, Settings.font_size, Settings.icon_size, Settings.list_style, mode);

orientation = getResources().getConfiguration().orientation;
if (Settings.list_style == LIST_STYLE) {

    lv = (ListView) v;
    lv.setAdapter(cva);

您将v 设置为null，然后将其转换为ListView（什么都不做），然后您尝试访问空变量的setAdapter 方法，因此，您有您的NullPointerException上线1207，即lv.setAdapter(cva);