Android广播接收电量信息源码分析

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资源摘要信息:"该资源是一个关于Android系统的广播接收器(Broadcast Receiver)用于电池电量显示的源码Demo,是专为学生在进行毕业设计时学习和参考而准备的。源码中包含了Android开发中的核心知识点,包括但不限于广播接收器的创建和使用、电池状态信息的获取、以及UI界面的展示等。" 知识点详细说明: 1. Android开发基础:Android是一种基于Linux内核的开源操作系统,广泛用于智能手机和平板电脑等移动设备。在Android应用开发中,广播接收器是处理设备全局广播消息的组件,例如电池电量变化、来电、短信等事件。 2. 广播接收器(Broadcast Receiver):广播接收器是Android四大组件之一,用于接收并响应广播通知。当应用注册了一个广播接收器后,系统在有相应的广播发出时会回调该接收器的onReceive()方法。 3. 电池电量监控:在Android中,可以通过注册一个电池状态的广播接收器来监控电池电量信息。系统会发送一个带有电量状态的Intent,包含电池电量、充电状态、电量变化等信息。 4. Android源码学习:该项目是一个源码级别的Demo,学生可以通过源码学习Android开发中的各种组件和API的使用。通过阅读和修改源码,可以深入理解Android应用的工作机制。 5. 毕业设计参考:作为计算机相关专业学生的毕业设计项目,该源码可以作为参考,帮助学生完成以Android平台为主的编程项目。学生可以通过修改和增强该Demo,达到毕业设计的要求和目的。 6. 用户界面(UI)设计:在该项目中,如何展示电池电量信息给用户是关键之一。学生需要学习和实践Android中的UI设计,包括布局文件的编写、控件的使用和自定义等。 7. 编程实践:通过实践该项目,学生可以学习到如何将理论知识转化为实际的应用程序。这不仅涉及编程语言(如Java或Kotlin)的应用,还包括对Android SDK的理解和运用。 8. 调试和测试:在开发过程中,调试和测试是必不可少的环节。学生需要掌握如何使用Android Studio提供的调试工具进行代码调试,以及对应用进行单元测试和UI测试,确保程序的稳定性和可用性。 9. 案例学习:案例研究是学习软件开发的一个重要方面。通过对这个案例的深入分析,学生可以了解一个完整的Android应用开发流程,从需求分析、设计、编码到测试和部署。 10. 持续更新和维护:在移动应用开发中,随着Android系统和设备的不断更新,应用也需要相应地进行更新和维护。学生可以通过这个项目了解如何对软件进行持续集成和版本控制。 以上就是对于给定文件信息的知识点说明,涵盖了Android开发的基础知识、具体技术实现、毕业设计参考、以及项目开发过程中的关键实践。通过研究和实践这些知识点,学生不仅能够完成一个具体的毕业设计项目,还能够为将来的专业工作打下坚实的基础。

06-08 10:58:36.121 1815 1815 E AndroidRuntime: Process: com.android.settings, PID: 1815 06-08 10:58:36.121 1815 1815 E AndroidRuntime: java.lang.RuntimeException: Error receiving broadcast Intent { act=android.net.wifi.supplicant.STATE_CHANGE flg=0x10 (has extras) } in com.android.settings.m8settings.receiver.WifiReceiver@41c8a5c 06-08 10:58:36.121 1815 1815 E AndroidRuntime: at android.app.LoadedApk$ReceiverDispatcher$Args.lambda$getRunnable$0$android-app-LoadedApk$ReceiverDispatcher$Args(LoadedApk.java:1830) 06-08 10:58:36.121 1815 1815 E AndroidRuntime: at android.app.LoadedApk$ReceiverDispatcher$Args$$ExternalSyntheticLambda0.run(Unknown Source:2) 06-08 10:58:36.121 1815 1815 E AndroidRuntime: at android.os.Handler.handleCallback(Handler.java:942) 06-08 10:58:36.121 1815 1815 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:99) 06-08 10:58:36.121 1815 1815 E AndroidRuntime: at android.os.Looper.loopOnce(Looper.java:201) 06-08 10:58:36.121 1815 1815 E AndroidRuntime: at android.os.Looper.loop(Looper.java:288) 06-08 10:58:36.121 1815 1815 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:8061) 06-08 10:58:36.121 1815 1815 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method) 06-08 10:58:36.121 1815 1815 E AndroidRuntime: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:703) 06-08 10:58:36.121 1815 1815 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:911) 06-08 10:58:36.121 1815 1815 E AndroidRuntime: Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.net.wifi.SupplicantState.name()' on a null object reference 06-08 10:58:36.121 1815 1815 E AndroidRuntime: at com.android.settings.m8settings.receiver.WifiReceiver.onReceive(WifiReceiver.java:46) 06-08 10:58:36.121 1815 1815 E AndroidRuntime: at android.app.LoadedApk$ReceiverDispatcher$Args.lambda$getRunnable$0$android-app-LoadedApk$ReceiverDispatcher$Args(LoadedApk.java:1820) 06-08 10:58:36.121 1815 1815 E AndroidRuntime: ... 9 more

2023-06-09 上传

Process: com.android.systemui, PID: 12501 C1C4B8B 06-09 16:11:31.132 12501 12501 E AndroidRuntime: java.lang.RuntimeException: Error receiving broadcast Intent { act=android.net.conn.CONNECTIVITY_CHANGE flg=0x4200010 (has extras) } in com.android.systemui.qsview.signal.SignalUtils$1@dbb3275 C1C4B8B 06-09 16:11:31.132 12501 12501 E AndroidRuntime: at android.app.LoadedApk$ReceiverDispatcher$Args.lambda$getRunnable$0$android-app-LoadedApk$ReceiverDispatcher$Args(LoadedApk.java:1830) C1C4B8B 06-09 16:11:31.132 12501 12501 E AndroidRuntime: at android.app.LoadedApk$ReceiverDispatcher$Args$$ExternalSyntheticLambda0.run(Unknown Source:2) C1C4B8B 06-09 16:11:31.132 12501 12501 E AndroidRuntime: at android.os.Handler.handleCallback(Handler.java:942) C1C4B8B 06-09 16:11:31.132 12501 12501 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:99) C1C4B8B 06-09 16:11:31.132 12501 12501 E AndroidRuntime: at android.os.Looper.loopOnce(Looper.java:201) C1C4B8B 06-09 16:11:31.132 12501 12501 E AndroidRuntime: at android.os.Looper.loop(Looper.java:288) C1C4B8B 06-09 16:11:31.132 12501 12501 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:8061) C1C4B8B 06-09 16:11:31.132 12501 12501 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method) C1C4B8B 06-09 16:11:31.132 12501 12501 E AndroidRuntime: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:703) C1C4B8B 06-09 16:11:31.132 12501 12501 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:911) C1C4B8B 06-09 16:11:31.132 12501 12501 E AndroidRuntime: Caused by: java.lang.IllegalStateException: Pid 12501 has exceeded the number of permissible registered listeners. Ignoring request to add.

2023-06-13 上传
2023-02-08 上传

分析蓝牙打印”05-22 20:55:15.340 3861 3861 W ActivityThread: handleWindowVisibility: no activity for token android.os.BinderProxy@1702c5f 05-22 20:55:15.405 3861 3861 W ContextImpl: Calling a method in the system process without a qualified user: android.app.ContextImpl.sendBroadcast:1005 android.content.ContextWrapper.sendBroadcast:444 com.zhiying.bluetoothmodelservice.MainActivity.sendBroadcast:643 com.zhiying.bluetoothmodelservice.MainActivity.onCreate:84 android.app.Activity.performCreate:7136 05-22 20:55:15.409 1936 5786 E ActivityManager: Sending non-protected broadcast android.newlink.exit.bluetoothSpeaker from system 3861:com.zhiying.bluetoothmodelservice/1000 pkg com.zhiying.bluetoothmodelservice 05-22 20:55:15.419 1936 5786 E ActivityManager: Sending non-protected broadcast android.newlink.exit.bluetoothSpeaker from system 3861:com.zhiying.bluetoothmodelservice/1000 pkg com.zhiying.bluetoothmodelservice 05-22 20:55:15.491 1797 1797 I MediaPlayerFactory: [getNameByPid:285] pid(3861), cmdline task_name(com.zhiying.bluetoothmodelservice). 05-22 20:55:15.561 3861 5918 W MediaPlayerNative: info/warning (710, 20) 05-22 20:55:15.562 3861 5918 W MediaPlayerNative: info/warning (710, 40) 05-22 20:55:15.610 3861 5918 W MediaPlayerNative: info/warning (710, 80) 05-22 20:55:15.628 3861 5918 W MediaPlayerNative: info/warning (710, 90) 05-22 20:55:15.628 3861 3861 I bt.sink.btconAc: true-------service-------- 05-22 20:55:15.628 3861 5918 W MediaPlayerNative: info/warning (710, 100) 05-22 20:55:15.629 3861 3861 W ContextImpl: Calling a method in the system process without a qualified user: android.app.ContextImpl.startService:1531 android.content.ContextWrapper.startService:664 com.zhiying.bluetoothmodelservice.MainActivity.setBluetoothServiceStatus:354 com.zhiying.bluetoothmodelservice.MainActivity.initData:187 com.zhiying.bluetoothmodelservice.MainActivity.onCreate:89 05-22 20:55:15.649 3861 3861 I UartUtils: setState: true 05-22 20:55:15.649 3861 3861 I HiMW_TVClient: [invoke:53] =============invoke cmd = 0xf10a=======begin============= 05-22 20:55:15.653 3861 3861 I HiMW_TVClient: [invoke:65] =============invoke cmd = 0xf10a=======end=============== 05-22 20:55:15.654 3861 3861 W AudioManager: Use of stream types is deprecated for operations other than volume control 05-22 20:55:15.654 3861 3861 W AudioManager: See the documentation of requestAudioFocus() for what to use instead with android.media.AudioAttributes to qualify your playback use case 05-22 20:55:15.655 1936 5786 I MediaFocusControl: requestAudioFocus() from uid/pid 1000/3861 clientId=android.media.AudioManager@3140a29 callingPack=com.zhiying.bluetoothmodelservice req=2 flags=0x0 sdk=29 05-22 20:55:15.658 3861 3861 D bt.sink.btconAc: onResume: 05-22 20:55:15.658 3861 3861 D bt.sink.btconAc: getBreathingScreenDatas: Could not find remote control icon properties 05-22 20:55:15.702 3861 3861 I bt.sink.btsevice: blueToothChange:关闭 05-22 20:55:15.706 3861 3861 D BluetoothAdapter: enable(): BT already enabled! 05-22 20:55:15.738 3861 3894 I ConfigStore: android::hardware::configstore::V1_0::ISurfaceFlingerConfigs::hasWideColorDisplay retrieved: 0 05-22 20:55:15.738 3861 3894 I ConfigStore: android::hardware::configstore::V1_0::ISurfaceFlingerConfigs::hasHDRDisplay retriev

2023-05-23 上传