java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String u.a.h.c.d()' on a null object reference

[jhwsx]

大神，这个报错能帮忙看一下吗？

Process Name: 'com.abc'
Thread Name: 'main'
Back traces starts.
java.lang.ExceptionInInitializerError
    at skin.support.content.res.SkinCompatUserThemeManager.get(SkinCompatUserThemeManager.java:124)
    at skin.support.content.res.SkinCompatResources.getSkinColor(SkinCompatResources.java:129)
    at skin.support.content.res.SkinCompatResources.getColor(SkinCompatResources.java:233)
    at com.abc.base.BaseAppCompatActivity.j0(BaseAppCompatActivity.java:3)
    at com.abc.base.BaseAppCompatActivity.onCreate(BaseAppCompatActivity.java:6)
    at com.abc.ui.call.AnswerCallActivity.onCreate(AnswerCallActivity.java)
    at android.app.Activity.performCreate(Activity.java:7142)
    at android.app.Activity.performCreate(Activity.java:7133)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1219)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2999)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3124)
    at android.app.ActivityThread.-wrap11(ActivityThread.java:0)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1821)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loop(Looper.java:192)
    at android.app.ActivityThread.main(ActivityThread.java:6890)
    at java.lang.reflect.Method.invoke(Method.java)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:556)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:875)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String u.a.h.c.d()' on a null object reference
    at skin.support.content.res.SkinCompatUserThemeManager.startLoadFromSharedPreferences(SkinCompatUserThemeManager.java:64)
    at skin.support.content.res.SkinCompatUserThemeManager.<init>(SkinCompatUserThemeManager.java:53)
    at skin.support.content.res.SkinCompatUserThemeManager.<clinit>(SkinCompatUserThemeManager.java:39)
    ... 19 more
Back traces ends.

在 mapping.txt 中，没有找到 'java.lang.String u.a.h.c.d() 对应的代码。 使用的版本是 4.0.5

[ximsfei]

反编译apk，看下这个java.lang.String u.a.h.c.d()是啥呢

[jhwsx]

定位到是在这里， 对应的源码是在，

public class SkinPreference {
    private static final String FILE_NAME = "meta-data";

    private static final String KEY_SKIN_NAME = "skin-name";
    private static final String KEY_SKIN_STRATEGY = "skin-strategy";
    private static final String KEY_SKIN_USER_THEME = "skin-user-theme-json";
    private static SkinPreference sInstance;
    private final Context mApp;
    private final SharedPreferences mPref;
    private final SharedPreferences.Editor mEditor;

    public static void init(Context context) {
        if (sInstance == null) {
            synchronized (SkinPreference.class) {
                if (sInstance == null) {
                    sInstance = new SkinPreference(context.getApplicationContext());
                }
            }
        }
    }

    public static SkinPreference getInstance() {
        return sInstance;
    }

    private SkinPreference(Context applicationContext) {
        mApp = applicationContext;
        mPref = mApp.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
        mEditor = mPref.edit();
    }

    public SkinPreference setSkinName(String skinName) {
        mEditor.putString(KEY_SKIN_NAME, skinName);
        return this;
    }

    public String getSkinName() {
        return mPref.getString(KEY_SKIN_NAME, "");
    }

    public SkinPreference setSkinStrategy(int strategy) {
        mEditor.putInt(KEY_SKIN_STRATEGY, strategy);
        return this;
    }

    public int getSkinStrategy() {
        return mPref.getInt(KEY_SKIN_STRATEGY, SkinCompatManager.SKIN_LOADER_STRATEGY_NONE);
    }

    public SkinPreference setUserTheme(String themeJson) {
        mEditor.putString(KEY_SKIN_USER_THEME, themeJson);
        return this;
    }

    public String getUserTheme() {
        return mPref.getString(KEY_SKIN_USER_THEME, "");
    }

    public void commitEditor() {
        mEditor.apply();
    }
}

推测是由于某种原因 SkinPreference 没有完成初始化。另外说一下我们的场景，我们这个页面是从后台弹出的，是替换来电的页面，不知道跟这个有没有关系。

84% 集中的设备是 vivo 8.1.0。

现在的对策是：自己再调用一下 SkinPreference.init(this);，等线上之后看一下效果。