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networkInfo.isConnected() error

I'm receiving an error when executing this code.
When connected to wifi, the function should display MAC address, otherwise "---"
private void DisplayWifiStatus() {
ConnectivityManager conMgr = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = conMgr.getActiveNetworkInfo();
wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
WifiInfo info = wifi.getConnectionInfo();
if (networkInfo.isConnected()) {
textMac.setText(info.getMacAddress());
}else {
textMac.setText("-----");
}
}
Logcat/Stacktrace:
03-11 21:32:07.532 3348-3348/com.light87sakurahimegmail.wifiscanner E/dalvikvm﹕ >>>>> Normal User
03-11 21:32:07.532 3348-3348/com.light87sakurahimegmail.wifiscanner E/dalvikvm﹕ >>>>> com.light87sakurahimegmail.wifiscanner [ userId:0 | appId:10337 ]
03-11 21:32:07.782 3348-3348/com.light87sakurahimegmail.wifiscanner E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.light87sakurahimegmail.wifiscanner, PID: 3348
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.light87sakurahimegmail.wifiscanner/com.light87sakurahimegmail.wifiscanner.MainActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2292)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2350)
at android.app.ActivityThread.access$800(ActivityThread.java:163)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1257)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:157)
at android.app.ActivityThread.main(ActivityThread.java:5335)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.light87sakurahimegmail.wifiscanner.MainActivity.DisplayWifiStatus(MainActivity.java:79)
at com.light87sakurahimegmail.wifiscanner.MainActivity.onCreate(MainActivity.java:43)
at android.app.Activity.performCreate(Activity.java:5389)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2256)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2350)
            at android.app.ActivityThread.access$800(ActivityThread.java:163)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1257)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:157)
            at android.app.ActivityThread.main(ActivityThread.java:5335)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
            at dalvik.system.NativeStart.main(Native Method)

NullPointerException on OutputStream using BluetoothSocket?

I'm trying to send data to an HC-05 bluetooth module but am not sure what I'm doing wrong. My main code where the problem lies is below.
I'm trying to just grab some specific text and send it off in bytes.
I've already paired my module before starting the app, and loop through all the paired devices using getBondedDevices() on my BluetoothAdapter and can confirm it is paired.
public void send(View view) {
try {
Log.d("TAG", "Sending!!!");
OutputStream os = mConnectionSocket.getOutputStream();
Log.d("TAG", "Text is: " + mSendText.getText().toString().getBytes());
// This lines under produces the error
os.write(mSendText.getText().toString().getBytes());
os.close();
Log.d("TAG", "Written...");
} catch (IOException e) {
e.printStackTrace();
}
}
Here is the code I use to get a BluetoothSocket after confirming the device is connected. mModule is the BluetoothDevice object I want to send data to.
if(isAlreadyConnected) {
try {
mConnectionSocket = mModule.createRfcommSocketToServiceRecord(mUUID);
new Thread(new Runnable() {
#Override
public void run() {
try {
mConnectionSocket.connect();
} catch (IOException e ) {e.printStackTrace();}
}
});
} catch (IOException e) {
e.printStackTrace();
}
} else {
Log.d("TAG", "Not connected!");
}
This is the stack trace of the error.
java.lang.IllegalStateException: Could not execute method of the activity
at android.view.View$1.onClick(View.java:3969)
at android.view.View.performClick(View.java:4640)
at android.view.View$PerformClick.run(View.java:19421)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5479)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at android.view.View$1.onClick(View.java:3964)
            at android.view.View.performClick(View.java:4640)
            at android.view.View$PerformClick.run(View.java:19421)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5479)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
            at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at android.bluetooth.BluetoothSocket.write(BluetoothSocket.java:510)
at android.bluetooth.BluetoothOutputStream.write(BluetoothOutputStream.java:85)
at java.io.OutputStream.write(OutputStream.java:82)
at **com.test.arduinobluetoothdatasender.MainActivity.send(MainActivity.java:133)**
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at android.view.View$1.onClick(View.java:3964)
            at android.view.View.performClick(View.java:4640)
            at android.view.View$PerformClick.run(View.java:19421)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5479)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
            at dalvik.system.NativeStart.main(Native Method)
The error goes away when I comment out this:
os.write(mSendText.getText().toString().getBytes());
Not really sure what I am doing wrong, but it is probably something obvious.

How to store a single row data into a string array of sqlite database in android

I have called a function returnCurrentNameById() by passing the id of the particular row. But it gives an error.
String[] s1;
public String[] returnCurrentNameById(int k) throws SQLException{
String[] columns = new String[]{ KEY_ID1, KEY_NAME, Key_DOB, KEY_AGE, KEY_PHONE_NO, Key_EXPERIENCE, KEY_EMAIL, KEY_STATUS, KEY_STATUS};
SQLiteDatabase db3 = this.getReadableDatabase();
Cursor c = db3.query(DATA_BASE_TABLE_NAME1, columns, KEY_ID1 + "=" + k, null, null, null, null);
if (c != null){
c.moveToFirst();
for(int i = 0; i<=8; i++){
s1[i] = c.getString(i);
}
return s1;
}
return null;
}
The Log cat error report is:
02-15 16:38:13.424 1545-1545/world.com.my`enter code here`progect09 D/AndroidRuntime﹕ Shutting down VM
02-15 16:38:13.464 1545-1545/world.com.myprogect09 W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x2bc9a300)
02-15 16:38:13.533 1545-1545/world.com.myprogect09 E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.IllegalStateException: Could not execute method of the activity
at android.view.View$1.onClick(View.java:3591)
at android.view.View.performClick(View.java:4084)
at android.view.View$PerformClick.run(View.java:16966)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at android.view.View$1.onClick(View.java:3586)
            at android.view.View.performClick(View.java:4084)
            at android.view.View$PerformClick.run(View.java:16966)
            at android.os.Handler.handleCallback(Handler.java:615)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4745)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
            at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at world.com.myprogect09.DataBaseSQL.returnCurrentNameById1(DataBaseSQL.java:209)
at world.com.myprogect09.ThirdActivity.isClicked(ThirdActivity.java:74)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at android.view.View$1.onClick(View.java:3586)
            at android.view.View.performClick(View.java:4084)
            at android.view.View$PerformClick.run(View.java:16966)
            at android.os.Handler.handleCallback(Handler.java:615)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4745)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
            at dalvik.system.NativeStart.main(Native Method)
02-15 16:38:34.491 1545-1545/world.com.myprogect09 I/Process﹕ Sending signal. PID: 1545 SIG: 9

You have not initialized your s1 array.
Use
s1 = new String[9];
to allocate an array of 9 elements.
Also check the return value of moveToFirst() so you don't get an exception in case the query returns no rows.

Replace
Cursor c = db3.query(DATA_BASE_TABLE_NAME1, columns, KEY_ID1 + "=" + k, null, null, null, null);
with
Cursor c = db3.query(DATA_BASE_TABLE_NAME1, columns, KEY_ID1 + " = ?", new String[]{String.valueOf(k)}, null, null, null);

Async task freezes

At no time que instantiate my object EmailTask the error occurs.
public void send(View view){
EditText text = (EditText) findViewById(R.id.editText);
Switch iluminacao = (Switch) findViewById(R.id.switch1);
Switch wifi = (Switch) findViewById(R.id.switch2);
RatingBar mBar = (RatingBar) findViewById(R.id.ratingBar);
try {
EmailTask asyncTask = new EmailTask(text.getText().toString(), iluminacao.isChecked(), wifi.isChecked(), mBar.getNumStars());
asyncTask.execute();
}catch(Exception e){
e.printStackTrace();
}
}
My AsyncTask
package com.morais.daniela.conectasp;
import android.os.AsyncTask;
import android.os.Build;
import org.apache.commons.mail.DefaultAuthenticator;
import org.apache.commons.mail.EmailException;
import org.apache.commons.mail.SimpleEmail;
/**
* Created by daniela.morais on 24/03/15.
*/
public class EmailTask extends AsyncTask<Void, Void, Void> {
private String comments;
private boolean getIluminacao;
private boolean getWifi;
private float getStars;
private SimpleEmail email = new SimpleEmail();
/**
* Recebe feedbacks enviados pelo usuario e inicializa configuracoes do email
* #param comments
* #param getIluminacao
* #param getWifi
* #param getStars
*/
public EmailTask(String comments, boolean getIluminacao, boolean getWifi, float getStars) {
this.comments = comments;
this.getIluminacao = getIluminacao;
this.getWifi = getWifi;
this.getStars = getStars;
email.setSSLOnConnect(true);
email.setHostName("smtp.gmail.com");
email.setSslSmtpPort("465");
email.setAuthenticator(new DefaultAuthenticator("conectasaopaulo#gmail.com.br","senha"));
}
/**
* Encaminhar email
* #param params
* #return
*/
#Override
protected Void doInBackground(Void... params) {
String iluminacao = "Não.";
String wifi = "Não.";
if(getIluminacao==true){
iluminacao = "Sim.";
}
if(getWifi==true){
wifi = "Sim.";
}
try {
email.setFrom("conectasaopaulo#gmail.com.br");
email.setDebug(true);
email.setSubject("Feedback - ConectaSP");
email.setMsg("Houve problemas com a iluminação? " + iluminacao + "\n\n"
+ "Houve problemas com o wifi? " + wifi + "\n\n"
+ "Avaliação geral " + getStars + "\n\n"
+ "Comentários:\n" + comments + "\n\n"
+ "Informações gerais do aparelho\n" + Build.DEVICE + "\t" + Build.HARDWARE + "\t" + Build.MODEL);
email.addTo("dani.m#hotmail.co.uk");
email.send();
} catch (EmailException e) {
System.err.println("Erro ao enviar email.");
}
return null;
}
}
Error
03-24 16:10:13.790 7215-7215/com.morais.daniela.conectasp E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.IllegalStateException: Could not execute method of the activity
at android.view.View$1.onClick(View.java:3103)
at android.view.View.performClick(View.java:3574)
at android.view.View$PerformClick.run(View.java:14293)
at android.os.Handler.handleCallback(Handler.java:605)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4448)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at android.view.View$1.onClick(View.java:3098)
            at android.view.View.performClick(View.java:3574)
            at android.view.View$PerformClick.run(View.java:14293)
            at android.os.Handler.handleCallback(Handler.java:605)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4448)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
            at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.VerifyError: com/morais/daniela/conectasp/EmailTask
at com.morais.daniela.conectasp.FeedbackActivity.send(FeedbackActivity.java:50)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at android.view.View$1.onClick(View.java:3098)
            at android.view.View.performClick(View.java:3574)
            at android.view.View$PerformClick.run(View.java:14293)
            at android.os.Handler.handleCallback(Handler.java:605)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4448)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
            at dalvik.system.NativeStart.main(Native Method)

Looks like maybe you either require a permission you don't have, or you require a newer version of the OS to run on.
Please check FeedbackActivity and make sure you aren't using any SDK calls that won't run on the device with which you are testing.

Android socket client doesn't work

I try to create a socket client connection to a python server like this, but it throwss me an error. This is triggered via a button, which works. The server is running on a RPi, but that's not the problem since a Python client works on my PC.
try {
Socket s = new Socket("192.168.178.43", 24069);
InputStreamReader streamReader = new InputStreamReader(s.getInputStream());
BufferedReader reader = new BufferedReader(streamReader);
String advice = reader.readLine();
reader.close();
} catch (UnknownHostException e) {
System.err.println("Unknown Host.");
// System.exit(1);
} catch (IOException e) {
System.err.println("Couldn't get I/O for "
+ "the connection.");
System.err.println(e);
// System.exit(1);
}
Stacktrace:
java.lang.IllegalStateException: Could not execute method of the activity
at android.view.View$1.onClick(View.java:3823)
at android.view.View.performClick(View.java:4438)
at android.view.View$PerformClick.run(View.java:18422)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at android.view.View$1.onClick(View.java:3818)
            at android.view.View.performClick(View.java:4438)
            at android.view.View$PerformClick.run(View.java:18422)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            at dalvik.system.NativeStart.main(Native Method)
Caused by: android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1145)
at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
at libcore.io.IoBridge.connect(IoBridge.java:112)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.Socket.startupSocket(Socket.java:567)
at java.net.Socket.tryAllAddresses(Socket.java:128)
at java.net.Socket.<init>(Socket.java:178)
at java.net.Socket.<init>(Socket.java:150)
at com.example.app.MainActivity.sendMessage(MainActivity.java:65)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at android.view.View$1.onClick(View.java:3818)
            at android.view.View.performClick(View.java:4438)
at android.view.View$PerformClick.run(View.java:18422)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            at dalvik.system.NativeStart.main(Native Method)

you can't do any long time process on the Main UI thread the reason for that to avoid the crash of your App if your operation failed
try to create new thread and do your work inside of it and if u want to pass any result to the UI u cant use
View.Post()
or
context.runOnUiThread()
this is an example of what you can do or you can use asynctask instead
new Thread(new Runnable() {
public void run() {
try {
Socket s = new Socket("192.168.178.43", 24069);
InputStreamReader streamReader = new InputStreamReader(s.getInputStream());
BufferedReader reader = new BufferedReader(streamReader);
String advice = reader.readLine();
reader.close();
} catch (UnknownHostException e) {
System.err.println("Unknown Host.");
// System.exit(1);
} catch (IOException e) {
System.err.println("Couldn't get I/O for "
+ "the connection.");
System.err.println(e);
// System.exit(1);
}
}
}).start();