java.lang.RuntimeException

Unable to start activity ComponentInfo{com.example.mihaianca.helloword/com.example.mihaianca.helloword.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.bluetooth.BluetoothAdapter.isEnabled()' on a null object reference

Solutions on the web45837

  • Unable to start activity ComponentInfo{com.example.mihaianca.helloword/com.example.mihaianca.helloword.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.bluetooth.BluetoothAdapter.isEnabled()' on a null object reference
  • Unable to start activity ComponentInfo{com.example.beatrizgomes.eddystonebeacon/com.example.beatrizgomes.eddystonebeacon.EddistoneBeaconActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.bluetooth.BluetoothAdapter.isEnabled()' on a null object reference
  • via Stack Overflow by About_Blank
    , 1 year ago
    Unable to start activity ComponentInfo{com.example.caroline.colorfinder/com.example.caroline.colorfinder.ColorFinderActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.bluetooth.BluetoothAdapter.isEnabled()' on a null object reference
  • Stack trace

    • java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mihaianca.helloword/com.example.mihaianca.helloword.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.bluetooth.BluetoothAdapter.isEnabled()' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)

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