Question

我有一个类似于Google蓝牙示例的代码，具有以下类别：

private class ConnectedThread extends Thread implements Serializable {
    private final BluetoothSocket mmSocket;
    private final InputStream mmInStream;
    private final OutputStream mmOutStream;

    public ConnectedThread(BluetoothSocket socket) {
        mmSocket = socket;
        InputStream tmpIn = null;
        OutputStream tmpOut = null;

        // Get the input and output streams, using temp objects because
        // member streams are final
        try {
            tmpIn = socket.getInputStream();
            tmpOut = socket.getOutputStream();
        } catch (IOException e) { }

        mmInStream = tmpIn;
        mmOutStream = tmpOut;
    }

    public void run() {
        byte[] buffer = new byte[1024];  // buffer store for the stream
        int bytes; // bytes returned from read()
        // Keep listening to the InputStream until an exception occurs
        while (true) {
            try {
                // Read from the InputStream
                bytes = mmInStream.available();
                if(bytes != 0) {
                    buffer = new byte[1024];
                    SystemClock.sleep(100); //pause and wait for rest of data. Adjust this depending on your sending speed.
                    bytes = mmInStream.available(); // how many bytes are ready to be read?
                    bytes = mmInStream.read(buffer, 0, bytes); // record how many bytes we actually read
                    mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer)
                            .sendToTarget(); // Send the obtained bytes to the UI activity
                }
            } catch (IOException e) {
                e.printStackTrace();

                break;
            }
        }
    }

    /* Call this from the main activity to send data to the remote device */
    public void write(String input) {
        byte[] bytes = input.getBytes();           //converts entered String into bytes
        try {
            mmOutStream.write(bytes);
        } catch (IOException e) { }
    }

    /* Call this from the main activity to shutdown the connection */
    public void cancel() {
        try {
            mmSocket.close();
        } catch (IOException e) { }
    }
}

我有一个ConnectedThread mConnectedThread，我想从MainActivity传递到另一个活动。两个活动中的变量名称相同。

我使用startController.putExtra("BLUETOOTH_CONNECTED_THREAD",mConnectedThread);

但是，我收到此错误，指出类型不兼容。

我尝试使用

将其强制转换为类

mConnectedThread = (ConnectedThread) getIntent().getSerializableExtra("BLUETOOTH_CONNECTED_THREAD");，并且至少可以编译。

这是我在发送对象的活动中的代码：

            Intent startController = new Intent(MainActivity.this,ControllerActivity.class);
            startController.putExtra("BLUETOOTH_CONNECTED_THREAD",mConnectedThread);
            startActivity(startController);

编辑-这是我的错误日志：

java.lang.RuntimeException: Parcelable encountered IOException writing serializable object (name = in.justrobotics.jrbluetoothcontrol.MainActivity$ConnectedThread)
    at android.os.Parcel.writeSerializable(Parcel.java:1527)
    at android.os.Parcel.writeValue(Parcel.java:1475)
    at android.os.Parcel.writeArrayMapInternal(Parcel.java:724)
    at android.os.BaseBundle.writeToParcelInner(BaseBundle.java:1423)
    at android.os.Bundle.writeToParcel(Bundle.java:1157)
    at android.os.Parcel.writeBundle(Parcel.java:764)
    at android.content.Intent.writeToParcel(Intent.java:8697)
    at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:3159)
    at android.app.Instrumentation.execStartActivity(Instrumentation.java:1520)
    at android.app.Activity.startActivityForResult(Activity.java:4402)
    at android.support.v4.app.BaseFragmentActivityApi16.startActivityForResult(BaseFragmentActivityApi16.java:54)
    at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:68)
    at android.app.Activity.startActivityForResult(Activity.java:4360)
    at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:751)
    at android.app.Activity.startActivity(Activity.java:4699)
    at android.app.Activity.startActivity(Activity.java:4667)
    at in.justrobotics.jrbluetoothcontrol.MainActivity$3.onClick(MainActivity.java:110)
    at android.view.View.performClick(View.java:5647)
    at android.view.View$PerformClick.run(View.java:22465)
    at android.os.Handler.handleCallback(Handler.java:754)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:163)
    at android.app.ActivityThread.main(ActivityThread.java:6239)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)
Caused by: java.io.NotSerializableException: android.bluetooth.BluetoothInputStream
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1224)
    at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1584)
    at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1549)
    at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1472)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1218)
    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)
    at android.os.Parcel.writeSerializable(Parcel.java:1522)
    ... 25 more

但这会导致运行时错误。

所以，现在，我有mConnectedThread = getIntent().getSerializableExtra("BLUETOOTH_CONNECTED_THREAD"); 在它下面有一条红色的波浪线。

该如何解决？相反，如何反序列化对象？另外，如果我可以使用Parcelable解决问题，那么我很乐意收到同样的解决方案。

This是我完整的源代码。

Answer 1

在我看来，您的线程必须位于活动之外。这意味着您需要使用Singleton，Manager或类似的工具来处理您的线程。

在活动之间传递对象时出错

1 个答案: