当我运行下面的代码时,我得到了: Caused by: java.lang.NullPointerException: Attempt to invokevirtualmethod 'android.view.Window$Callback android.view.Window.getCallback()' on a null object reference
Unable to start activity ComponentInfocom.ali.dagg
ComponentInfo{com.blindnavi.navirecog2/com.blindnavi.navirecog2.NaviVoice}: java.lang.NullPointerException: Attemptto invokevirtualmethod 'android.view.Window$Callback android.view.Window.getCallback()' on a null)
at andr
我把这种方法从单例中调用如下:但我收到了一个错误:
java.lang.NullPointerException: Attemptto invokevirtualmethod 'android.view.Window$Callback android.view.Window.getCallback()' on a null object
com.chest.chestbrasil.chest/com.chest.chestbrasil.chest.LoginScreen}: java.lang.NullPointerException: Attemptto invokevirtualmethod 'android.view.Window$Callback android.view.Window.getCallback()' on a null)
activity ComponentInfo{com.example.test/com.example.test.ThrowActivity}: java.lang.NullPointerException: Attemptto invokevirtualmethod 'android.view.Window$Callback android.view.Window.getCallback()' on a null(Looper.java:154)
at
当时的日志就是这样写的: java.lang.NullPointerException: Attempt to invokevirtualmethod'android.view.Window$Callback android.view.Window.getCallback()' on a null object reference at android.support.v7
ComponentInfo{kuehl.leon.tictactoe/kuehl.leon.tictactoe.MainActivity}: java.lang.NullPointerException: Attemptto invokevirtualmethod 'android.view.Window$Callback android.view.Window.getCallback()' on a null)
at android.a
ComponentInfo{com.hfad.appmovienav/com.hfad.appmovienav.MainActivity}: java.lang.NullPointerException: Attemptto invokevirtualmethod 'android.view.Window$Callback android.view.Window.getCallback()' on a nullandroid.app.ActivityTh
com.example.usuario.firebase/com.example.usuario.firebase.MainActivity}: java.lang.NullPointerException: Attemptto invokevirtualmethod 'android.view.Window$Callback android.view.Window.getCallback()' on a nullLooper.java:163)