demo空指针

[xzhixian]

2020-07-23 10:24:56.092 8730-8730/com.huruwo.serialporthelper E/AndroidRuntime: FATAL EXCEPTION: main Process: com.huruwo.serialporthelper, PID: 8730 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.huruwo.serialporthelper/com.huruwo.serialporthelper.SerialPortHelperActivity}: java.lang.NullPointerException: Attempt to get length of null array at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2804) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2875) at android.app.ActivityThread.-wrap12(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1578) at android.os.Handler.dispatchMessage(Handler.java:105) at android.os.Looper.loop(Looper.java:156) at android.app.ActivityThread.main(ActivityThread.java:6623) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:942) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:832) Caused by: java.lang.NullPointerException: Attempt to get length of null array at android_serialport_api.SerialPortFinder$Driver.getDevices(SerialPortFinder.java:44) at android_serialport_api.SerialPortFinder.getAllDevicesPath(SerialPortFinder.java:111) at com.huruwo.serialporthelper.SerialPortHelperActivity.iniview(SerialPortHelperActivity.java:91) at com.huruwo.serialporthelper.SerialPortHelperActivity.onCreate(SerialPortHelperActivity.java:63) at android.app.Activity.performCreate(Activity.java:6910) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2757) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2875)  at android.app.ActivityThread.-wrap12(ActivityThread.java)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1578)  at android.os.Handler.dispatchMessage(Handler.java:105)  at android.os.Looper.loop(Looper.java:156)  at android.app.ActivityThread.main(ActivityThread.java:6623)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:942)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:832)  2020-07-23 10:24:56.102 8730-8730/com.huruwo.serialporthelper I/Process: Sending signal. PID: 8730 SIG: 9