Bug: Koler[V, 0.3.1]The app crashed when I use the call icon to call out without imputing any number.

Project Information

• Repository:
  https://github.com/Chooloo/call_manage

• Project Name: Koler

• The issue submitted on GitHub:https://github.com/Chooloo/call_manage/issues/26

• My github link: https://github.com/darewealth

Describe the bug

The behavior is a bit strange because it affects two things. Sometimes when I just click the call function without adding any number, the app will crash. Other regular behavior is when I click the call function to dial out, which it will dial a certain unknown number. Then if I stop the call, and dial back after 10 secs, the app will crash.

To Reproduce

1. Open the app

2. Click on the dial pad

3. Click on the call button, let it dial and cut the call

4. Wait for some seconds. Maybe 10sec or more and re-click again.

Expected behavior

Crash causes hinderances and I don't expect to encounter one while performing such activity in the app.

Screenshots

Smartphone

• Device: [Gionee X1]

• OS: [7.0]

• Version [0.3.1]

Log

06-19 18:50:30.930 16342 16342 E AndroidRuntime: Process: com.chooloo.www.callmanager, PID: 16342
06-19 18:50:30.930 16342 16342 E AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.chooloo.www.callmanager/com.chooloo.www.callmanager.ui.activity.OngoingCallActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.isEmpty()' on a null object reference
06-19 18:50:30.930 16342 16342 E AndroidRuntime:    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2417)
06-19 18:50:30.930 16342 16342 E AndroidRuntime:    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2477)
06-19 18:50:30.930 16342 16342 E AndroidRuntime:    at android.app.ActivityThread.-wrap11(ActivityThread.java)
06-19 18:50:30.930 16342 16342 E AndroidRuntime:    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1345)
06-19 18:50:30.930 16342 16342 E AndroidRuntime:    at android.os.Handler.dispatchMessage(Handler.java:102)
06-19 18:50:30.930 16342 16342 E AndroidRuntime:    at android.os.Looper.loop(Looper.java:148)
06-19 18:50:30.930 16342 16342 E AndroidRuntime:    at android.app.ActivityThread.main(ActivityThread.java:5452)
06-19 18:50:30.930 16342 16342 E AndroidRuntime:    at java.lang.reflect.Method.invoke(Native Method)
06-19 18:50:30.930 16342 16342 E AndroidRuntime:    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:781)
06-19 18:50:30.930 16342 16342 E AndroidRuntime:    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:671)
06-19 18:50:30.930 16342 16342 E AndroidRuntime: Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.isEmpty()' on a null object reference
06-19 18:50:30.930 16342 16342 E AndroidRuntime:    at com.chooloo.www.callmanager.util.CallManager.getDisplayContact(CallManager.java:221)
06-19 18:50:30.930 16342 16342 E AndroidRuntime:    at com.chooloo.www.callmanager.ui.activity.OngoingCallActivity.displayInformation(OngoingCallActivity.java:522)
06-19 18:50:30.930 16342 16342 E AndroidRuntime:    at com.chooloo.www.callmanager.ui.activity.OngoingCallActivity.onCreate(OngoingCallActivity.java:199)
06-19 18:50:30.930 16342 16342 E AndroidRuntime:    at android.app.Activity.performCreate(Activity.java:6305)
06-19 18:50:30.930 16342 16342 E AndroidRuntime:    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1110)
06-19 18:50:30.930 16342 16342 E AndroidRuntime:    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2370)
06-19 18:50:```