I am trying to make a fairly simple test app that prints the accelerometer's values on the only activity screen. But when I run it, it gives a Fatal Error: NetworkOnMainThreadException in main.
I have tried to follow what might be the cause of it and followed this question to remove the problem which is to put all the simulator calls in respective AsyncTask classes. But, I am still getting the error.
My MainActivity.java:
Import statements:
package com.example.chillii;
import org.openintents.sensorsimulator.hardware.Sensor;
import org.openintents.sensorsimulator.hardware.SensorEvent;
import org.openintents.sensorsimulator.hardware.SensorEventListener;
import org.openintents.sensorsimulator.hardware.SensorManagerSimulator;
import android.hardware.SensorManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
The 3 AsyncTask classes that are supposed to remove the aforementioned error:
class ConnectToSimulator extends AsyncTask<SensorManagerSimulator, Void, Void>
{
@Override
protected Void doInBackground(SensorManagerSimulator ... arg0) {
try{
arg0[0].connectSimulator();
}
catch(Exception E)
{
Log.i("ConnectTaskError: ", E.getMessage());
}
return null;
}
}
class RegisterToSimulator extends AsyncTask<Object, Void, Void> {
@Override
protected Void doInBackground(Object... sm) {
try{
((SensorManagerSimulator) sm[0]).registerListener((SensorEventListener) sm[1], ((SensorManagerSimulator) sm[0]).getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_FASTEST);
}catch(Exception e)
{
Log.i("error", e.getMessage());
}
return null;
}
}
class UnregisterFromSimulator extends AsyncTask<Object, Void, Void> {
@Override
protected Void doInBackground(Object... sm) {
try{
((SensorManagerSimulator) sm[0]).unregisterListener((SensorEventListener) sm[1]);
}catch(Exception e)
{
Log.i("error : ", e.getMessage());
}
return null;
}
}
My MainActivity class. The three AsyncTask classes are called in onCreate(). onResume() and onPause() (follows documentation on SensorSimulator's wiki page). Also, implements onSensorChanged() where it prints the three values in respective TextViews:
public class MainActivity extends ActionBarActivity implements SensorEventListener {
private SensorManagerSimulator mSensorManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
mSensorManager = SensorManagerSimulator.getSystemService(this, SENSOR_SERVICE);
new ConnectToSimulator().execute(mSensorManager);
//mSensorManager.connectSimulator();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}
@Override
protected void onResume() {
super.onResume();
new RegisterToSimulator().execute(mSensorManager, this);
}
@Override
protected void onPause() {
new UnregisterFromSimulator().execute(mSensorManager, this);
super.onPause();
}
@Override
public void onAccuracyChanged(Sensor arg0, int arg1) {
// Auto-generated method stub
}
@Override
public void onSensorChanged(SensorEvent E) {
TextView tv;
tv = (TextView) findViewById(R.id.xbox);
tv.setText(Double.toString(E.values[0]));
tv = (TextView) findViewById(R.id.ybox);
tv.setText(Double.toString(E.values[1]));
tv = (TextView) findViewById(R.id.zbox);
tv.setText(Double.toString(E.values[2]));
}
}
This is fragment_main.xml. Mostly boilerplate + 3 TextViews that by default print X, Y and Z:
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView android:id="@+id/xbox"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="X" />
<TextView android:id="@+id/ybox"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Y" />
<TextView android:id="@+id/zbox"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Z" />
</LinearLayout>
</LinearLayout>
EDIT:
The stack trace in logcat is as follows:
05-29 05:30:23.239: E/AndroidRuntime(2231): FATAL EXCEPTION: main
05-29 05:30:23.239: E/AndroidRuntime(2231): android.os.NetworkOnMainThreadException
05-29 05:30:23.239: E/AndroidRuntime(2231): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1133)
05-29 05:30:23.239: E/AndroidRuntime(2231): at libcore.io.BlockGuardOs.recvfrom(BlockGuardOs.java:163)
05-29 05:30:23.239: E/AndroidRuntime(2231): at libcore.io.IoBridge.recvfrom(IoBridge.java:506)
05-29 05:30:23.239: E/AndroidRuntime(2231): at java.net.PlainSocketImpl.read(PlainSocketImpl.java:488)
05-29 05:30:23.239: E/AndroidRuntime(2231): at java.net.PlainSocketImpl.access$000(PlainSocketImpl.java:46)
05-29 05:30:23.239: E/AndroidRuntime(2231): at java.net.PlainSocketImpl$PlainSocketInputStream.read(PlainSocketImpl.java:240)
05-29 05:30:23.239: E/AndroidRuntime(2231): at java.io.InputStreamReader.read(InputStreamReader.java:244)
05-29 05:30:23.239: E/AndroidRuntime(2231): at java.io.BufferedReader.fillBuf(BufferedReader.java:130)
05-29 05:30:23.239: E/AndroidRuntime(2231): at java.io.BufferedReader.readLine(BufferedReader.java:354)
05-29 05:30:23.239: E/AndroidRuntime(2231): at org.openintents.sensorsimulator.hardware.SensorSimulatorClient.readSensor(SensorSimulatorClient.java:654)
05-29 05:30:23.239: E/AndroidRuntime(2231): at org.openintents.sensorsimulator.hardware.SensorSimulatorClient.readSensor(SensorSimulatorClient.java:571)
05-29 05:30:23.239: E/AndroidRuntime(2231): at org.openintents.sensorsimulator.hardware.SensorSimulatorClient.access$1000(SensorSimulatorClient.java:53)
05-29 05:30:23.239: E/AndroidRuntime(2231): at org.openintents.sensorsimulator.hardware.SensorSimulatorClient$1.handleMessage(SensorSimulatorClient.java:505)
05-29 05:30:23.239: E/AndroidRuntime(2231): at android.os.Handler.dispatchMessage(Handler.java:99)
05-29 05:30:23.239: E/AndroidRuntime(2231): at android.os.Looper.loop(Looper.java:137)
05-29 05:30:23.239: E/AndroidRuntime(2231): at android.app.ActivityThread.main(ActivityThread.java:5103)
05-29 05:30:23.239: E/AndroidRuntime(2231): at java.lang.reflect.Method.invokeNative(Native Method)
05-29 05:30:23.239: E/AndroidRuntime(2231): at java.lang.reflect.Method.invoke(Method.java:525)
05-29 05:30:23.239: E/AndroidRuntime(2231): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
05-29 05:30:23.239: E/AndroidRuntime(2231): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
05-29 05:30:23.239: E/AndroidRuntime(2231): at dalvik.system.NativeStart.main(Native Method)
