dan1107669
Newbie
This afternoon Android Studio updated to version 3.0. Now I have a few warnings in this activity where there were none before. One that stands out refers to this class:
The warning says: "this AsyncTask class should be static or leaks might occur"
Can anyone help me fix this? I'm hoping it will fix my Broken pipe Exception error
Code:
private class ConnectBT extends AsyncTask<Void, Void, Void> // UI threadThe warning says: "this AsyncTask class should be static or leaks might occur"
Can anyone help me fix this? I'm hoping it will fix my Broken pipe Exception error
Code:
package com.example.shiel.sonicartrc;
import android.app.Activity;
import android.app.ProgressDialog;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Context;
import android.content.Intent;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import java.io.IOException;
import java.util.UUID;
public class SendData extends Activity implements SensorEventListener {
Button btnOn, btnOff, btnDis;
String address = null;
private ProgressDialog progress;
BluetoothAdapter myBluetooth = null;
BluetoothSocket btSocket = null;
private boolean isBtConnected = false;
static final UUID myUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
//MOTION STARTS
//private static final String TAG = ledControl.class.getSimpleName();
private SensorManager mSensorManager;
private Sensor mAccelerometer;
TextView tv,tv1;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
Intent newint = getIntent();
address = newint.getStringExtra(BTdevices.EXTRA_ADDRESS); //receive the address of the bluetooth device
//view of the ledControl
setContentView(R.layout.activity_send_data);
//call the widgtes
btnOn = (Button)findViewById(R.id.button2);
btnOff = (Button)findViewById(R.id.button3);
btnDis = (Button)findViewById(R.id.button4);
//MOTION START
//get the sensor service
mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
//get the accelerometer sensor
mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
//get layout
tv=(TextView)findViewById(R.id.xval);
tv1=(TextView)findViewById(R.id.yval);
Log.d("TAG", "My debug-message4");
//MOTION ENDS
new ConnectBT().execute(); //Call the class to connect
//commands to be sent to bluetooth
btnOn.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
turnOnLed(); //method to turn on
}
});
btnOff.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
turnOffLed(); //method to turn off
}
});
btnDis.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
Disconnect(); //close connection
}
});
}
private void Disconnect()
{
if (btSocket!=null) //If the btSocket is busy
{
try
{
btSocket.close(); //close connection
}
catch (IOException e)
{ msg("E-Disconnect");}
}
finish(); //return to the first layout
}
private void turnOffLed()
{
if (btSocket!=null)
{
try
{
btSocket.getOutputStream().write("<a>".getBytes());
}
catch (IOException e)
{
msg("Error-offled");
}
}
}
private void turnOnLed()
{
if (btSocket!=null)
{
try
{
btSocket.getOutputStream().write("<b>".getBytes());
}
catch (IOException e)
{
msg(e.toString());
}
}
}
private void sendMotor(String cmdSendLR)
{
if (btSocket!=null)
try {
btSocket.getOutputStream().write(cmdSendLR.getBytes());
} catch (IOException e) {
Log.e("sendData", e.toString());
}
}
// fast way to call Toast
private void msg(String s)
{
Toast.makeText(getApplicationContext(),s,Toast.LENGTH_LONG).show();
}
private class ConnectBT extends AsyncTask<Void, Void, Void> // UI thread
{
private boolean ConnectSuccess = true; //if it's here, it's almost connected
@Override
protected void onPreExecute()
{
progress = ProgressDialog.show(SendData.this, "Connecting", "Please wait"); //show a progress dialog
}
@Override
protected Void doInBackground(Void... devices) //while the progress dialog is shown, the connection is done in background
{
try
{
if (btSocket == null || !isBtConnected)
{
myBluetooth = BluetoothAdapter.getDefaultAdapter();//get the mobile bluetooth device
BluetoothDevice dispositive = myBluetooth.getRemoteDevice(address);//connects to the device's address and checks if it's available
btSocket = dispositive.createInsecureRfcommSocketToServiceRecord(myUUID);//create a RFCOMM (SPP) connection
BluetoothAdapter.getDefaultAdapter().cancelDiscovery();
btSocket.connect();//start connection
}
}
catch (IOException e)
{
ConnectSuccess = false;//if the try failed, you can check the exception here
}
return null;
}
@Override
protected void onPostExecute(Void result) //after the doInBackground, it checks if everything went fine
{
super.onPostExecute(result);
if (!ConnectSuccess)
{
msg("Connection Failed");
finish();
}
else
{
msg("Connected");
isBtConnected = true;
}
progress.dismiss();
}
}
//MOTION STARTS
@Override
public final void onAccuracyChanged(Sensor sensor, int accuracy)
{
// Do something here if sensor accuracy changes.
}
@Override
public final void onSensorChanged(SensorEvent event)
{
float x, y;
WindowManager windowMgr = (WindowManager)this.getSystemService(WINDOW_SERVICE);
int rotationIndex = windowMgr.getDefaultDisplay().getRotation();
if (rotationIndex == 1 || rotationIndex == 3){ // detect 90 or 270 degree rotation
x = -event.values[1];
y = event.values[0];
}
else{
x = event.values[0]; //Force x axis in m s-2
y = event.values[1]; //Force y axis in m s-2
}
tv.setText("X axis" +"\t\t"+x);
tv1.setText("Y axis" + "\t\t" +y);
// tv2.setText("Z axis" +"\t\t" +z);
if (isBtConnected) {
int xx = Math.round(x);
int yy = Math.round(y);
sendMotor("<" + xx + "," + yy + ">");
try {
Thread.sleep(50);
} catch (InterruptedException ex) {
Thread.currentThread().interrupt();
}
}
}
protected void onResume() {
super.onResume();
mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_NORMAL);
}
protected void onPause() {
super.onPause();
mSensorManager.unregisterListener(this);
}
//MOTION ENDS
}