java - 广播接收器使程序崩溃

Question

我正在尝试将一个对象传递给Broadcastreceiver。该机制在不传递任何数据的情况下运行良好，但是当我尝试传递对象时，程序崩溃了。

这是代码:

public void SetFutureStartTime(int startHour, int startMin)
{
    Context context = this;

    m_alarmMgr = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
    Intent intent = new Intent(context, AlarmReceiver_BoilerOn.class);

    Bundle args = new Bundle();
    args.putSerializable("tcpClientObj",(Serializable)m_TcpClient);
    intent.putExtra("DATA",args);

    m_alarmIntent = PendingIntent.getBroadcast(context, 0, intent, 0); // --------------> The code crushes here

    // Set the alarm to start at 21:32 PM
    Calendar calendar = Calendar.getInstance();
    calendar.setTimeInMillis(System.currentTimeMillis());
    calendar.set(Calendar.HOUR_OF_DAY, startHour);
    calendar.set(Calendar.MINUTE, startMin);

    m_alarmMgr.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), m_alarmIntent);
}

这是Broadcastreceiver实现:

public class AlarmReceiver_BoilerOn extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {

    Bundle args = intent.getBundleExtra("DATA");
    final TcpClient tcpClient = (TcpClient) args.getSerializable("tcpClientObj");  
}
}

这是错误日志:

11-19 19:35:59.553: D/AndroidRuntime(2389): Shutting down VM
11-19 19:35:59.553: D/AndroidRuntime(2389): --------- beginning of crash
11-19 19:35:59.571: E/AndroidRuntime(2389): FATAL EXCEPTION: main
11-19 19:35:59.571: E/AndroidRuntime(2389): Process: boiler.boiler, PID: 2389
11-19 19:35:59.571: E/AndroidRuntime(2389): java.lang.RuntimeException: Parcelable encountered IOException writing

serializable object (name = boiler.boiler.TcpClient) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.os.Parcel.writeSerializable(Parcel.java:1526) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.os.Parcel.writeValue(Parcel.java:1474) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.os.Parcel.writeArrayMapInternal(Parcel.java:723) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.os.BaseBundle.writeToParcelInner(BaseBundle.java:1408) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.os.Bundle.writeToParcel(Bundle.java:1133) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.os.Parcel.writeBundle(Parcel.java:763) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.os.Parcel.writeValue(Parcel.java:1392) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.os.Parcel.writeArrayMapInternal(Parcel.java:723) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.os.BaseBundle.writeToParcelInner(BaseBundle.java:1408) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.os.Bundle.writeToParcel(Bundle.java:1133) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.os.Parcel.writeBundle(Parcel.java:763) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.content.Intent.writeToParcel(Intent.java:8655) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:3052) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1518) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.app.Activity.startActivityForResult(Activity.java:4224) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.support.v4.app.BaseFragmentActivityJB.startActivityForResult(BaseFragmentActivityJB.java:50) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:79) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.app.Activity.startActivityForResult(Activity.java:4183) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:859) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.app.Activity.startActivity(Activity.java:4507) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.app.Activity.startActivity(Activity.java:4475) 11-19 19:35:59.571: E/AndroidRuntime(2389): at boiler.boiler.MainActivity.SetFutureStartTime(MainActivity.java:414) 11-19 19:35:59.571: E/AndroidRuntime(2389): at boiler.boiler.MainActivity$2$3.onClick(MainActivity.java:185) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.view.View.performClick(View.java:5610) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.view.View$PerformClick.run(View.java:22265) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.os.Handler.handleCallback(Handler.java:751) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.os.Handler.dispatchMessage(Handler.java:95) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.os.Looper.loop(Looper.java:154) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.app.ActivityThread.main(ActivityThread.java:6077) 11-19 19:35:59.571: E/AndroidRuntime(2389): at java.lang.reflect.Method.invoke(Native Method) 11-19 19:35:59.571: E/AndroidRuntime(2389): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866) 11-19 19:35:59.571: E/AndroidRuntime(2389): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756) 11-19 19:35:59.571: E/AndroidRuntime(2389): Caused by: java.io.NotSerializableException: boiler.boiler.MainActivity$ConnectTask$1 11-19 19:35:59.571: E/AndroidRuntime(2389): at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1224) 11-19 19:35:59.571: E/AndroidRuntime(2389): at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1584) 11-19 19:35:59.571: E/AndroidRuntime(2389): at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1549) 11-19 19:35:59.571: E/AndroidRuntime(2389): at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1472) 11-19 19:35:59.571: E/AndroidRuntime(2389): at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1218) 11-19 19:35:59.571: E/AndroidRuntime(2389): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346) 11-19 19:35:59.571: E/AndroidRuntime(2389): at android.os.Parcel.writeSerializable(Parcel.java:1521) 11-19 19:35:59.571: E/AndroidRuntime(2389): ... 31 more 11-19 19:35:59.590: W/ActivityManager(1590): Force finishing activity boiler.boiler/.MainActivity

我错过了什么？

谢谢。

Answer 1

如果 m_TcpClient 实现 Parcelable 接口(interface)，则最好的选择是通过 Intent Extras 将其实例作为 Parcelable 传递。您不必将其显式转换为可序列化或可打包。但是，请记住，AlarmManager 存在一个众所周知的错误。它丢失了可打包的额外内容，因此您必须首先对数据进行编码，而不是直接传递它。以下是一些基本方法:

fun Parcelable.marshall() : ByteArray {
    val parcel = Parcel.obtain()
    writeToParcel(parcel, 0)
    val bytes = parcel.marshall()
    parcel.recycle()
    return bytes
}

fun <T> ByteArray.unmarshall(creator: Parcelable.Creator<T>): T {
    val parcel = unmarshall()
    val result = creator.createFromParcel(parcel)
    parcel.recycle()
    return result
}

private fun ByteArray.unmarshall(): Parcel {
    val parcel = Parcel.obtain()
    parcel.unmarshall(this, 0, size)
    parcel.setDataPosition(0)
    return parcel
}

使用此方法，您可以将 ByteArray 作为 Intent 额外

intent.putExtra(Receiver.EXTRA, m_TcpClient.marshall())

然后将其放入 BroadcastReceiver 中，如下所示:

intent.getByteArrayExtra(EXTRA)?.run {
    val m_TcpClient = unmarshall(TcpClient.CREATOR)
}