Environment Info：
APK Version :10.9.993 (223)
AndroidOS Version = 6.0.1
Description information：
When the XXX. db database content is empty, APP crashes directly.
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Integer org.liberty.android.fantastischmemo.entity.Card.getId()' on a null object reference
at org.liberty.android.fantastischmemo.ui.CardPlayerActivity.bindCardPlayerService(CardPlayerActivity.java:213)
at org.liberty.android.fantastischmemo.ui.CardPlayerActivity.onPostInit(CardPlayerActivity.java:111)
at org.liberty.android.fantastischmemo.ui.QACardActivity$2.run(QACardActivity.java:648)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5539)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:745)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:635)
Reproduce Step：
1597633937200.zip
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Environment Info： APK Version :10.9.993 (223) AndroidOS Version = 6.0.1 Description information： When the XXX. db database content is empty, APP crashes directly.
Crash Info: crashActivity=org.liberty.android.fantastischmemo.ui.CardPlayerActivity
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Integer org.liberty.android.fantastischmemo.entity.Card.getId()' on a null object reference at org.liberty.android.fantastischmemo.ui.CardPlayerActivity.bindCardPlayerService(CardPlayerActivity.java:213) at org.liberty.android.fantastischmemo.ui.CardPlayerActivity.onPostInit(CardPlayerActivity.java:111) at org.liberty.android.fantastischmemo.ui.QACardActivity$2.run(QACardActivity.java:648) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:148)