Help Send byte to Bluetooth device Output Stream

[rwlakin]

Android Studio 3.1
I have a RN42 bluetooth device (BT) and my Android program connects to the BT. When I write to the device I get an exception error and my app shuts down. This is a code snippet:
public void sendData() throws IOException
{
Toast.makeText(this, "sending:"+charValue, Toast.LENGTH_SHORT).show();
OutputStreamWriter outWriter = new OutputStreamWriter(mmOutputStream);
mmOutputStream.write(charValue);
myLabel.setText("Data Sent");
}
Using debug it fails at :
OutputStreamWriter outWriter = new OutputStreamWriter(mmOutputStream);
carValue is byte. Enclosed file Plow5_8.txt is complete Java code.
Thanks

 

[Deleted User]

What's the exception you're getting?

 

[rwlakin]

I get lots of errors. This is the first: at java.io.Writer.<init>(Writer.java:88)
This is the second: at java.iutputStreamWriter.<init>(OutputStreamWriter.java:109)

I'm not experienced enough to understand the code required to correct the errors.
This is the code where it fails:
public void sendData() throws IOException
{
Toast.makeText(this, "sending:"+charValue, Toast.LENGTH_SHORT).show();
int sso = 0; // used for debug
try (final OutputStreamWriter outWriter = new OutputStreamWriter(mmOutputStream)) {
myLabel.setText("Data Sent");
outWriter.write(charValue);
mmOutputStream.write(charValue);
Log.d(TAG, " at sendata() bombs out");
}
}
Program file listing enclosed: Plow5_8.txt

 

[Deleted User]

Can you post the output from your Logcat view?

 

[rwlakin]

at java.io.Writer.<init>(Writer.java:88)
at java.iutputStreamWriter.<init>(OutputStreamWriter.java:109)
at com.rogerlakin.snowplowcontrol.MainActivity.sendData(MainActivity.java:300)
at com.rogerlakin.snowplowcontrol.MainActivity$2.onTouch(MainActivity.java:127)
at android.view.View.dispatchTouchEvent(View.java:10721)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2865)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2492)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2865)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2492)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2865)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2492)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2865)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2492)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2865)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2492)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2865)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2492)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2865)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2492)
at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:505)
at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1863)
at android.app.Activity.dispatchTouchEvent(Activity.java:3226)
at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:68)
at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:68)
at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:467)
at android.view.View.dispatchPointerEvent(View.java:10954)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:5051)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4908)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4439)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4492)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4458)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4591)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4466)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4648)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4439)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4492)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4458)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4466)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4439)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6936)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6875)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6836)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:7046)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:323)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:6688)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358)

Also:
import java.io.Writer;
import java.io.IOException;
import java.iutputStream;
import java.iutputStreamWriter;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Set;
import java.util.UUID;


public class MainActivity extends AppCompatActivity {
int MY_PERMISSIONS_REQUEST_ACCESS_COARSE_LOCATION = 1;
String TAG;
TextView myLabel;
BluetoothAdapter mBluetoothAdapter;
BluetoothSocket mmSocket;
BluetoothDevice mmDevice;
OutputStream mmOutputStream;
Writer mmWriter;
volatile boolean stopWorker;
char charValue;