无法初始化显示事件接收器

Question

我制作了一个应用程序，定期启动从服务器检索信息的服务。

我使用AlarmManager来安排服务 这很好用，应用程序每隔30分钟接收一次警报 该应用程序工作正常，但经过一整夜的不活动 - 我启动应用程序，它崩溃与错误：＆＃39;无法初始化显示事件接收器＆＃39;。

否则这完美无缺。

我长时间搜索这个问题并发现其他人有同样的问题，但还没有解决方案。

Process: it.unipi.iet.portolan.traceroute, PID: 13092
java.lang.RuntimeException: Failed to initialize display event receiver.  status=-2147483648
at android.view.DisplayEventReceiver.nativeInit(Native Method)
at android.view.DisplayEventReceiver.<init>(DisplayEventReceiver.java:61)
at android.view.Choreographer$FrameDisplayEventReceiver.<init>(Choreographer.java:695)
at android.view.Choreographer.<init>(Choreographer.java:169)
at android.view.Choreographer.<init>(Choreographer.java:72)
at android.view.Choreographer$1.initialValue(Choreographer.java:98)
at android.view.Choreographer$1.initialValue(Choreographer.java:91)
at java.lang.ThreadLocal$Values.getAfterMiss(ThreadLocal.java:430)
at java.lang.ThreadLocal.get(ThreadLocal.java:65)
at android.view.Choreographer.getInstance(Choreographer.java:194)
at android.view.ViewRootImpl.<init>(ViewRootImpl.java:370)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:248)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2871)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2271)
at android.app.ActivityThread.access$800(ActivityThread.java:145)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1206)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5141)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:611)
at dalvik.system.NativeStart.main(Native Method)

Answer 1

仅仅为了一些信息，我无法理解为什么， 消息来自：

frameworks/base/core/jni/android_view_DisplayEventReceiver.cpp:4239:        message.appendFormat("Failed to initialize display event receiver.  status=%d", status);

或者这个

frameworks/base/libs/androidfw/DisplayEventDispatcher.cpp:1427:        ALOGW("Failed to initialize display event receiver, status=%d", result);

status -2147483648 = 0x800000000

从DisplayEventReceiver返回：

  /* initCheck returns the state of DisplayEventReceiver after construction.*/

status_t initCheck() const;

并查看DisplayEventReceiver.cpp

status_t DisplayEventReceiver::initCheck() const {
if (mDataChannel != NULL)
    return NO_ERROR;
return NO_INIT;
}

看起来mDataChannel是NULL，

在构造函数

中初始化的mDataChannel

DisplayEventReceiver::DisplayEventReceiver() {
    sp<ISurfaceComposer> sf(ComposerService::getComposerService());
    if (sf != NULL) {
        mEventConnection = sf->createDisplayEventConnection();
        if (mEventConnection != NULL) {
            mDataChannel = mEventConnection->getDataChannel();
        }
    }
}

所以sf SurfaceComposer为NULL或sf-＆gt; createDisplayEventConnection返回NULL。

并在文件./system/core/include/utils/Errors.h

中

...
NO_ERROR            =0
UNKNOWN_ERROR       = (-2147483647-1), // INT32_MIN value

NO_MEMORY           = -ENOMEM,
INVALID_OPERATION   = -ENOSYS,
BAD_VALUE           = -EINVAL,
BAD_TYPE            = (UNKNOWN_ERROR + 1),
NO_INIT             = -ENODEV,
...

似乎状态必须NO_INIT ...