关于在三星Galaxy S上调度'Down'键的"Window Manager Crash"

Question

我正在使用Instrumentation在各种Android设备上运行我的单元测试.测试用例在仿真器和除三星Galaxy S之外的所有设备上都能正常工作.在三星Galaxy S上,使用检测注入大约30个关键事件后,它会显示一个Window Manager崩溃,这是完整的崩溃日志:

D/dalvikvm(11862): GC_EXPLICIT freed 6800 objects / 374040 bytes in 54ms
D/dalvikvm(11862): GC_EXPLICIT freed 780 objects / 71856 bytes in 39ms
W/dalvikvm(11862): threadid=9: thread exiting with uncaught exception (group=0x4001d7d0)
E/WindowManager( 2472): Window Manager Crash
E/WindowManager( 2472): java.lang.NullPointerException
E/WindowManager( 2472):         at com.android.server.WindowManagerService$KeyWaiter.waitForNextEventTarget(WindowManagerService.java:5844)
E/WindowManager( 2472):         at com.android.server.WindowManagerService.injectKeyEvent(WindowManagerService.java:5565)
E/WindowManager( 2472):         at android.view.IWindowManager$Stub.onTransact(IWindowManager.java:110)
E/WindowManager( 2472):         at com.android.server.WindowManagerService.onTransact(WindowManagerService.java:692)
E/WindowManager( 2472):         at android.os.Binder.execTransact(Binder.java:288)
E/WindowManager( 2472):         at dalvik.system.NativeStart.run(Native Method)
E/AndroidRuntime(11862): FATAL EXCEPTION: Instr: com.myapp.test.ImpInstrumentation
E/AndroidRuntime(11862): java.lang.NullPointerException
E/AndroidRuntime(11862):        at android.os.Parcel.readException(Parcel.java:1266)
E/AndroidRuntime(11862):        at android.os.Parcel.readException(Parcel.java:1248)
E/AndroidRuntime(11862):        at android.view.IWindowManager$Stub$Proxy.injectKeyEvent(IWindowManager.java:830)
E/AndroidRuntime(11862):        at android.app.Instrumentation.sendKeySync(Instrumentation.java:859)
E/AndroidRuntime(11862):        at android.app.Instrumentation.sendKeyDownUpSync(Instrumentation.java:872)
E/AndroidRuntime(11862):        at com.myapp.test.util.ListUtil.<b>arrowDownToPosition</b>(ListUtil.java:69)

这是一段代码,它通常会崩溃:

    private void arrowDownToPosition(int position) {
          int maxDowns = 50;
        while(mListView.getSelectedItemPosition() < position && --maxDowns > 0) {
             mInstrumentation.sendKeyDownUpSync(KeyEvent.KEYCODE_DPAD_DOWN);
        }

//Crashes on below line dispatching enter key
      mInstrumentation.sendKeyDownUpSync(KeyEvent.KEYCODE_ENTER);
    }

欢迎所有解决方案/建议.

Answer 1

根据你的堆栈跟踪，你的变量似乎mInstrumentation为空。你是不是忘记初始化了？

尝试这个：

while(mInstrumentation!=null && mListView.getSelectedItemPosition()>-1) {
    mInstrumentation.sendKeyDownUpSync(KeyEvent.KEYCODE_DPAD_DOWN);
}