java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.bluetooth.BluetoothGatt.discoverServices()' on a null object reference

Stack Overflow | dipali pawar | 5 months ago
  1. 0

    BluetoothGatt not discoverservices() onConnectionStateChange in android

    Stack Overflow | 5 months ago | dipali pawar
    java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.bluetooth.BluetoothGatt.discoverServices()' on a null object reference
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    Why aren't my objects instantiating under certain resume conditions?

    Stack Overflow | 7 months ago | Travis Dewitt
    java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.drawable.BitmapDrawable.setVisible(boolean, boolean)' on a null object reference
  3. 0

    Runtime error

    GitHub | 2 years ago | johnamcruz
    java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.util.concurrent.atomic.AtomicBoolean.compareAndSet(boolean, boolean)' on a null object reference
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  5. 0

    我的Android进阶之旅------>android中service的onStartCommand()方法中intent为null的问题

    mamicode.com | 1 year ago
    java.lang.RuntimeException: Unable to start service com.tintele.sos.SosService@36087165 with null: java.lang.NullPointerException: Attempt to invoke virtual method ‘boolean android.content.Intent.getBooleanExtra(java.lang.String, boolean)‘ on a null object reference

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    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'boolean android.bluetooth.BluetoothGatt.discoverServices()' on a null object reference

      at com.actofit.wear.Home.LifeLogStopService$1.onConnectionStateChange()
    2. com.actofit.wear
      LifeLogStopService$1.onConnectionStateChange
      1. com.actofit.wear.Home.LifeLogStopService$1.onConnectionStateChange(LifeLogStopService.java:103)
      1 frame
    3. Android Platform
      Binder.execTransact
      1. android.bluetooth.BluetoothGatt$1.onClientConnectionState(BluetoothGatt.java:181)
      2. android.bluetooth.IBluetoothGattCallback$Stub.onTransact(IBluetoothGattCallback.java:70)
      3. android.os.Binder.execTransact(Binder.java:453)
      3 frames