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Detecting incoming call [duplicate]

This question already has answers here:
How to detect incoming calls, in an Android device?
(13 answers)
Closed 6 years ago.
Here, I'm creating a application to start flash when an sms is recieved and an incoming call is recieved. The flash is working on recieving sms but not on call, why? Can anyone help? I'm stuck on this since many days. Thanks in advance, my code is given below. Flash only performs on recieving sms but not on recieving calls. Expecting your guidence. When I searched regarding this I am getting only the Classes and methods to create my own app. Requesting for the explanation
public class SMSReceiver extends BroadcastReceiver {
Boolean call;
private Camera camera;
int count;
long delaytime;
Editor editor;
String flashtype;
private boolean hasFlash;
private boolean isFlashOn;
private boolean isFlashblinking;
private boolean mActive;
private Handler mHander;
private final Runnable mRunnable;
private boolean mSwap;
private Context mcontext;
AudioManager myAudioManager;
String noofblinks;
int numbofblink;
Parameters params;
SharedPreferences pref;
StringBuilder result;
Boolean ring;
Boolean silent;
Boolean sms;
String timetoblink;
Boolean vibrate;
public class PhoneListener extends PhoneStateListener {
private Context context;
public PhoneListener(Context c) {
Log.i("CallRecorder", "PhoneListener constructor");
this.context = c;
}
public void onCallStateChanged(int state, String incomingNumber) {
switch (state) {
case 0:
try {
SMSReceiver.this.mHander
.removeCallbacks(SMSReceiver.this.mRunnable);
if (SMSReceiver.this.camera != null) {
SMSReceiver.this.camera.release();
}
} catch (Exception e) {
try {
SMSReceiver.this.camera.release();
} catch (Exception e2) {
}
}
case 1:
try {
if (SMSReceiver.this.call.booleanValue()) {
if (SMSReceiver.this.myAudioManager.getRingerMode() == 0
&& SMSReceiver.this.silent.booleanValue()) {
SMSReceiver.this.flash();
}
if (SMSReceiver.this.myAudioManager.getRingerMode() == 1
&& SMSReceiver.this.vibrate.booleanValue()) {
SMSReceiver.this.flash();
}
if (SMSReceiver.this.myAudioManager.getRingerMode() == 2
&& SMSReceiver.this.ring.booleanValue()) {
SMSReceiver.this.flash();
}
}
} catch (Exception e3) {
}
case 2:
try {
SMSReceiver.this.mHander
.removeCallbacks(SMSReceiver.this.mRunnable);
if (SMSReceiver.this.camera != null) {
SMSReceiver.this.camera.release();
}
} catch (Exception e4) {
try {
SMSReceiver.this.camera.release();
} catch (Exception e5) {
}
}
default:
}
}
}
public SMSReceiver() {
this.mHander = new Handler();
this.mActive = false;
this.mSwap = true;
this.isFlashblinking = true;
this.count = 0;
this.mRunnable = new Runnable() {
#Override
// TODO Auto-generated method stub
public void run() {
try {
SMSReceiver sMSReceiver = SMSReceiver.this;
sMSReceiver.count++;
} catch (Exception e) {
}
if (SMSReceiver.this.mActive) {
if (SMSReceiver.this.count >= SMSReceiver.this.numbofblink * 2) {
try {
SMSReceiver.this.mHander
.removeCallbacks(SMSReceiver.this.mRunnable);
SMSReceiver.this.camera.release();
} catch (Exception e2) {
}
}
if (SMSReceiver.this.isFlashOn) {
SMSReceiver.this.turnOffFlash();
} else {
SMSReceiver.this.turnOnFlash();
}
try {
SMSReceiver.this.mHander.postDelayed(
SMSReceiver.this.mRunnable,
SMSReceiver.this.delaytime);
} catch (Exception e3) {
}
}
}
};
}
public void onReceive(Context context, Intent intent) {
try {
this.mcontext = context;
this.count = 0;
try {
this.pref = PreferenceManager
.getDefaultSharedPreferences(this.mcontext);
this.editor = this.pref.edit();
this.call = Boolean.valueOf(this.pref.getBoolean("call", true));
this.sms = Boolean.valueOf(this.pref.getBoolean("sms", true));
this.timetoblink = this.pref.getString("blinktime", "200");
this.noofblinks = this.pref.getString("noofblinks", "5");
this.ring = Boolean.valueOf(this.pref.getBoolean("ring", true));
this.vibrate = Boolean.valueOf(this.pref.getBoolean("vibrate",
true));
this.silent = Boolean.valueOf(this.pref.getBoolean("silent",
true));
this.flashtype = this.pref.getString("flashtype", "1");
this.delaytime = Long.parseLong(this.timetoblink);
this.numbofblink = Integer.parseInt(this.noofblinks);
this.myAudioManager = (AudioManager) this.mcontext
.getSystemService("audio");
} catch (Exception e) {
}
((TelephonyManager) this.mcontext.getSystemService("phone"))
.listen(new PhoneListener(context), 32);
} catch (Exception e2) {
}
}
public void flash() {
try {
this.hasFlash = this.mcontext.getPackageManager().hasSystemFeature(
"android.hardware.camera.flash");
if (this.hasFlash) {
getCamera();
startStrobe();
return;
}
AlertDialog alert = new Builder(this.mcontext).create();
alert.setTitle("Error");
alert.setMessage("Sorry, your device doesn't support flash light!");
alert.setButton("OK", new OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
});
alert.show();
} catch (Exception e) {
}
}
private void getCamera() {
if (this.camera == null) {
try {
this.camera = Camera.open();
this.params = this.camera.getParameters();
} catch (Exception e) {
Log.e("Camera Error. Failed to Open. Error: ", e.getMessage());
}
}
}
private void turnOnFlash() {
try {
if (!this.isFlashOn && this.camera != null && this.params != null) {
this.params = this.camera.getParameters();
if (this.flashtype.equals("2")) {
this.params.setFlashMode("torch");
} else if (this.flashtype.equals("3")) {
this.params.setFlashMode("torch");
} else {
this.params.setFlashMode("torch");
}
this.camera.setParameters(this.params);
this.camera.startPreview();
this.isFlashOn = true;
}
} catch (Exception e) {
}
}
private void turnOffFlash() {
try {
if (this.isFlashOn && this.camera != null && this.params != null) {
this.params = this.camera.getParameters();
this.params.setFlashMode("off");
this.camera.setParameters(this.params);
this.camera.stopPreview();
this.isFlashOn = false;
}
} catch (Exception e) {
}
}
private void startStrobe() {
try {
this.mActive = true;
this.mHander.post(this.mRunnable);
} catch (Exception e) {
}
}
}

This is doable
follow this link for the same
http://androidexample.com/Incomming_Phone_Call_Broadcast_Receiver__-_Android_Example/index.php?view=article_discription&aid=61

Make a broadcast receiver to know about incoming call
write that code in AndroidManifes.xml
<receiver android:name=".ServiceReceiver" >
<intent-filter>
<action android:name="android.intent.action.PHONE_STATE" />
</intent-filter>
</receiver>
and make a new a class like that.
public class ServiceReceiver extends BroadcastReceiver {
#Override
public void onReceive(final Context context, Intent intent) {
TelephonyManager telephony = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
telephony.listen(new PhoneStateListener(){
#Override
public void onCallStateChanged(int state, String incomingNumber) {
if(state.equals(TelephonyManager.EXTRA_STATE_RINGING)){
// Run the flash in that line
}
}
},PhoneStateListener.LISTEN_CALL_STATE);
}
}

Android screen freezes while sending data to usb device

I have following problem - I need to send data to my usb device and read tag of the device. First I need to turn on device - that's what table pal does. Next, when response from device equals DAAD0674016F6B26 I need to start scan - table readId. After that depends if response is DAAD046F62ADA900 - that means that in 3 sec device didn't found tag to scan and device turned off. My task is to send again command to turn it on ... and again, and again and so on (I know it's quite expensive - command every 3 sec - it wasn't my idea). But , when the response is different than DAAD046F62ADA900 - that's my tag :)To sum up - if response is DAAD046F62ADA900 I need to send command to scan again I try to do it with while loop :
while(shouldReceive) {
sendCommand
}
but the screen freezes so I tried to do it in thread , and right now it looks like this :
final Thread receive= new Thread(new Runnable() {
public UsbDevice device;
#Override
public void run() {
usbManager = (UsbManager) getActivity().getSystemService(Context.USB_SERVICE);
PendingIntent mPermissionIntent = PendingIntent.getBroadcast(getContext(), 0, new Intent(ACTION_USB_PERMISSION), 0);
IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
getActivity().registerReceiver(usbReceiver, filter);
shouldReceaive = true;
HashMap<String, UsbDevice> deviceList = usbManager.getDeviceList();
Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
while (deviceIterator.hasNext()) {
final UsbDevice device = deviceIterator.next();
if (device.getVendorId() == 1659 && device.getProductId() == 8963) {
this.device = device;
usbManager.requestPermission(device, mPermissionIntent);
break;
}
}
final UsbConnector.CallbackListener listener = new UsbConnector.CallbackListener() {
#Override
public void onStatusChanged(UsbConnector.Status newStatus) {
Toast.makeText(getContext(), "Status" + newStatus, Toast.LENGTH_SHORT).show();
}
#Override
public void onScanCompleted(String result) {
Toast.makeText(getContext(), "Result" + result, Toast.LENGTH_SHORT).show();
}
};
shouldReceaive = true;
UsbConnector connector = new UsbConnector(getContext(), device, listener);
connector.run();
connector.send(pal);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
byte[] received = connector.receive(36);
if (received == null) {
Toast.makeText(getContext(), "Błąd inicjalizacji skanera", Toast.LENGTH_SHORT).show();
}
if (received != null) {
String response = null;
long longValue = ByteBuffer.wrap(received).getLong();
response = Long.toHexString(longValue).toUpperCase();
Toast.makeText(getContext(), "RESPONSE: " + response, Toast.LENGTH_SHORT).show();
if (response.contentEquals("DAAD0674016F6B26")) {
Toast.makeText(getContext(), "Rozpoczynam skanowanie ...", Toast.LENGTH_SHORT).show();
connector.send(readId);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
byte[] receivedTag = connector.receive(36);
if (receivedTag != null) {
String tag = null;
long tagValue = ByteBuffer.wrap(receivedTag).getLong();
tag = Long.toHexString(tagValue).toUpperCase();
while (tag.contentEquals("DAAD046F62ADA900")) {
Toast.makeText(getContext(), "PING, SKANUJE DALEJ!", Toast.LENGTH_SHORT).show();
connector.send(readId);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
String tag2 = null;
long tagValue2 = ByteBuffer.wrap(receivedTag).getLong();
tag2 = Long.toHexString(tagValue2).toUpperCase();
Toast.makeText(getContext(), "ZESKANOWANY TAG!: " + tag2, Toast.LENGTH_SHORT).show();
for (Car cary : carList) {
if (tag2.contentEquals(cary.getmNumber())) {
Log.e(TAG, "setCars: JEST");
} else {
Log.e(TAG, "setCars: NIE MA");
}
}
}
} else {
Toast.makeText(getContext(), "Błąd przy inicjalziacji skanera", Toast.LENGTH_SHORT).show();
}
}
}
});
mScan.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
receive.run();
}
});
but problem still exists. Screen freezes and user can do nothing. Any idea how to solve this problem ?

When you invoke run() method, it's executed on the calling thread (in your case on UI thread).
#Override
public void onClick(View v) {
receive.run();
}
Try this:
#Override
public void onClick(View v) {
receive.start();
}

Android bluetooth connection throwing read failed, socket might closed or timeout, read ret android

I am trying to communicate from android to a microprocessor controlled device, which uses HC-05, I have tried every possible solution, but btSocket.connect() is throwing
read failed, socket might closed or timeout, read ret android
Relevant code snippet is provided below:-
/**
* Sends the data Over BlueTooth
* #param data
* bytes which is to be send to the bibox.
*
* */
private void sendDataToBlueTooth(byte[] data){
SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
String mMacChecking = pref.getString("BL", "bl");
if (!mMacChecking.equals("bl")) {
// Intent in = new Intent(getApplicationContext(), DataSendReceive.class);
// in.putExtra("isBtRemoteData", true);
// in.putExtra("bData", data);
// startActivity(in);
final SharedPreferences pre = PreferenceManager.getDefaultSharedPreferences(this.getApplicationContext());
this.mDeviceMACAddress = pre.getString("BL", "");
this.mSendArray = data;
this.mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (this.mBluetoothAdapter == null) {
Toast.makeText(this, R.string.no_bt_device, Toast.LENGTH_LONG).show();
this.finish();
return;
}
this.connectTOdevice();
this.mHandler = new Handler() {
#SuppressLint("ShowToast")
#Override
public void handleMessage(final android.os.Message msg) {
if (msg.what == 1) {
mConnectStatus = true;
for (int i = 0; i < mSendArray.length; i++) {
write(mSendArray[i]);
}
String str = Arrays.toString(mSendArray);
Log.d("", str);
//Added an alert dialog to show the data..
// To activate the alert, put the below 3 lines inside the on click of the OK button...
onBackPressed();
try {
Thread.sleep(1000);
} catch (final InterruptedException e) {
e.printStackTrace();
}
} else if (msg.what == 2) {
// Set button to display current status
// connectStat = true;
final byte[] readBuf = (byte[]) msg.obj;
System.out.println("InHandler - ");
String receivedString = "";
for (final byte b : readBuf) {
// `byte` to `Byte`
final int temp = b;
final String tempString = String.valueOf(temp);
receivedString = receivedString.concat("," + tempString);
}
Log.d("received string", receivedString);
for (final byte element : readBuf) {
System.out.print(element + ",");
}
// System.out.println("" + readBuf);
} else if (mBluetoothAdapter.isEnabled()) {
final Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
} else {
// Connection failed
mFailToast.show();
/* Intent scan = new Intent(getApplicationContext(), BluetoothDeviceDiscover.class); */
finish();
// startActivity(scan);
}
}
};
mFailToast = Toast.makeText(this, "Failed to connect please on " + this.mDeviceMACAddress + " or scan for new device", Toast.LENGTH_SHORT);
this.mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (this.mBluetoothAdapter == null) {
Toast.makeText(this, R.string.no_bt_device, Toast.LENGTH_LONG).show();
this.finish();
return;
}
this.connectTOdevice();
}
}
#Override
protected void onDestroy() {
super.onDestroy();
try {
if (this.mBtSocket != null) {
this.mBtSocket.close();
}
} catch (final IOException e2) {}
}
public void write(final byte arr2) {
if (this.mConnectStatus == true) if (this.mOutStream != null) {
try {
this.mOutStream.write(arr2);
} catch (final IOException e) {
showToast(getString(R.string.dataNotSendMessage), false);
}
} else {
showToast(getString(R.string.switchOnBlueToothDevice), false);
}
}
public void connectTOdevice() {
this.mConnectThread = new ConnectThread(this.mDeviceMACAddress);
this.mConnectThread.start();
}
private final BroadcastReceiver mPairReceiver = new BroadcastReceiver() {
boolean isUnpairToastToBeDisplayed = true;
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
String DEVICE_PIN = getString(R.string.device_pin);
final BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if (action.equals("android.bluetooth.device.action.BOND_STATE_CHANGED")) {
byte[] pin;
try {
pin = (byte[]) BluetoothDevice.class.getMethod("convertPinToBytes", String.class).invoke(BluetoothDevice.class, DEVICE_PIN);
BluetoothDevice.class.getMethod("setPin", byte[].class).invoke(device, pin);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
}
if (BluetoothDevice.ACTION_BOND_STATE_CHANGED.equals(action)) {
final int state = intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE, BluetoothDevice.ERROR);
final int prevState = intent.getIntExtra(BluetoothDevice.EXTRA_PREVIOUS_BOND_STATE, BluetoothDevice.ERROR);
if (state == BluetoothDevice.BOND_BONDED && prevState == BluetoothDevice.BOND_BONDING) {
//Continue work here....
//If the number of paired devices greater than 3, unpair everything except the current one...
//Causing problem in lenovo tablet...
//Problem :- Tablet hang for more than 4 paired devices...
BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();
Set<BluetoothDevice> mPairedDevices;
mPairedDevices = btAdapter.getBondedDevices();
final SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
String deviceAddress = pref.getString("BL", "NoDevice");
if (mPairedDevices.size() > MAX_ALLOWED_PAIRED_DEVICES) {
// findViewById(R.id.title_paired_devices).setVisibility(View.VISIBLE);
for (final BluetoothDevice deviceForLoop : mPairedDevices) {
//if the device for loop doesn't match the latest saved address...
//unpair the device...
if(!deviceAddress.equals(deviceForLoop.getAddress())){
isUnpairToastToBeDisplayed = false;
unpairDevice(deviceForLoop);
isUnpairToastToBeDisplayed = true;
}
}
}
showToast(getString(R.string.pairedToastMessage),false);
} else if (state == BluetoothDevice.BOND_NONE && prevState == BluetoothDevice.BOND_BONDED){
if(!isUnpairToastToBeDisplayed)
showToast(getString(R.string.unpairedToastMessage),false);
}
}
try {
device.getClass().getMethod("setPairingConfirmation", boolean.class).invoke(device, true);
Intent i = new Intent(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
sendBroadcast(i);
} catch (IllegalArgumentException e1) {
e1.printStackTrace();
} catch (IllegalAccessException e1) {
e1.printStackTrace();
} catch (InvocationTargetException e1) {
e1.printStackTrace();
} catch (NoSuchMethodException e1) {
e1.printStackTrace();
}
}
};
private void unpairDevice(final BluetoothDevice device) {
try {
final Method m = device.getClass().getMethod("removeBond", (Class[]) null);
m.invoke(device, (Object[]) null);
} catch (final Exception e) {
// Log.e(TAG, e.getMessage());
}
}
public class ConnectThread extends Thread {
private final String address;
private boolean connectionStatus;
ConnectThread(final String MACaddress) {
this.address = MACaddress;
this.connectionStatus = false;
}
#Override
public void run() {
mBluetoothAdapter.cancelDiscovery();
try {
final BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(this.address);
IntentFilter intent = new IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
registerReceiver(mPairReceiver, intent);
try {
SPP_UUID = device.getUuids()[0].getUuid();
BluetoothSocket tmp = device.createInsecureRfcommSocketToServiceRecord(SPP_UUID);
Class<?> clazz = tmp.getRemoteDevice().getClass();
Class<?>[] paramTypes = new Class<?>[] {Integer.TYPE};
Method m = clazz.getMethod("createRfcommSocket", paramTypes);
Object[] params = new Object[] {Integer.valueOf(1)};
mBtSocket = (BluetoothSocket) m.invoke(tmp.getRemoteDevice(), params);
} catch (final IOException e) {
this.connectionStatus = false;
} catch (Exception e) {
}
} catch (final IllegalArgumentException e) {
this.connectionStatus = false;
}
try {
mBtSocket.connect();
this.connectionStatus = true;
} catch (final IOException e1) {
try {
mBtSocket.close();
Log.d("check", "check");
} catch (final IOException e2) {}
}
// Create a data stream so we can talk to server.
try {
mOutStream = mBtSocket.getOutputStream();
} catch (final IOException e2) {
this.connectionStatus = false;
}
// Send final result
if (this.connectionStatus) {
mHandler.sendEmptyMessage(1);
} else {
mHandler.sendEmptyMessage(0);
}
}
}
}

I found the answer in the following question:-
IOException: read failed, socket might closed - Bluetooth on Android 4.3
Actually I had to use reflection only on the fall back, ie, inside the catch when the connect fails.

android multithreading: thread.join() does not work as expected

I have trouble using thread.join in my code below. It should wait for the thread to finish before executing the codes after it, right? It was behaving differently on different occasions.
I have three cases to check if my code goes well
App is used for the first time - works as expected but the loading page don't appear while downloading
App is used the second time (db is up to date) - works okay
App is used the third time (db is outdated, must update) - won't update, screen blacks out, then crashes
I think I have problems with this code on onCreate method:
dropOldSchedule();
dropThread.join();
triggerDownload();
Based on the logs, the code works until before this part... What can be the problem?
MainActivity.java
public class MainActivity extends Activity {
final static int INDEX_ACCTTYPE = 0;
final static int INDEX_ECN = 1;
final static int INDEX_TLN = 2;
final static int INDEX_SIN = 3;
final static int INDEX_MOBILE = 4;
final static int INDEX_CITY = 5;
final static int INDEX_START_DATE = 6;
final static int INDEX_START_TIME = 7;
final static int INDEX_END_DATE = 8;
final static int INDEX_END_TIME = 9;
final static int INDEX_REASON = 10;
final static int INDEX_DETAILS = 11;
DatabaseHandler db;
String str;
ProgressDialog pd;
TextView homeText1, homeText2, homeText3, homeText4;
final private String csvFile = "http://www.meralco.com.ph/pdf/pms/pms_test.csv";
final private String uploadDateFile = "http://www.meralco.com.ph/pdf/pms/UploadDate_test.txt";
Thread dropThread = new Thread(new Runnable() {
public void run() {
db = new DatabaseHandler(MainActivity.this);
db.dropOldSchedule();
runOnUiThread(new Runnable() {
public void run() {
while (!pd.isShowing());
db.close();
pd.dismiss();
}
});
}
});
Thread getUploadDateThread = new Thread(new Runnable() {
public void run() {
try {
URL myURL = new URL(uploadDateFile);
BufferedReader so = new BufferedReader(new InputStreamReader(myURL.openStream()));
while (true) {
String output = so.readLine();
if (output != null) {
str = output;
}
else {
break;
}
}
so.close();
}
catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
runOnUiThread(new Runnable() {
public void run() {
while (!pd.isShowing());
pd.dismiss();
}
});
}
});
Thread downloadThread = new Thread(new Runnable() {
public void run() {
db = new DatabaseHandler(MainActivity.this);
db.beginTransaction();
try {
URL url = new URL(csvFile);
Log.i("dl", "start");
InputStream input = url.openStream();
CSVReader reader = new CSVReader(new InputStreamReader(input));
Log.i("dl", "after reading");
String [] sched;
while ((sched = reader.readNext()) != null) {
if(sched[INDEX_CITY].equals("")) sched[INDEX_CITY]="OTHERS";
try {
db.addRow(sched[INDEX_SIN], sched[INDEX_CITY],
sched[INDEX_START_DATE], sched[INDEX_START_TIME],
sched[INDEX_END_DATE], sched[INDEX_END_TIME],
sched[INDEX_DETAILS], sched[INDEX_REASON]);
} catch (IndexOutOfBoundsException e) {
db.addRow(sched[INDEX_SIN], sched[INDEX_CITY],
sched[INDEX_START_DATE], sched[INDEX_START_TIME],
sched[INDEX_END_DATE], sched[INDEX_END_TIME],
"", sched[INDEX_REASON]);
//e.printStackTrace();
}
}
input.close();
Log.i("dl", "finished");
} catch (MalformedURLException e) {
e.printStackTrace();
db.endTransaction();
} catch (IOException e) {
e.printStackTrace();
db.endTransaction();
}
Log.d("Count", ""+db.count());
db.setTransactionSuccessful();
db.endTransaction();
writeUploadDateInTextFile();
}
});
#SuppressWarnings("unqualified-field-access")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.pms_main);
Button home = (Button) findViewById(R.id.home);
home.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, MeralcoSuite_TabletActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
finish();
}
});
homeText1 = (TextView) findViewById(R.id.home_text1);
homeText2 = (TextView) findViewById(R.id.home_text2);
homeText3 = (TextView) findViewById(R.id.home_text3);
homeText4 = (TextView) findViewById(R.id.home_text4);
homeText1.setVisibility(View.INVISIBLE);
homeText2.setVisibility(View.INVISIBLE);
homeText3.setVisibility(View.INVISIBLE);
homeText4.setVisibility(View.INVISIBLE);
getUploadDate();
try {
getUploadDateThread.join(); //wait for upload date
Log.d("getUploadDate","thread died, upload date=" + str);
if(dbExists()){
db = new DatabaseHandler(MainActivity.this);
Log.d("Count", "" + db.count());
db.close();
if(!uploadDateEqualsDateInFile()){
dropOldSchedule();
dropThread.join();
triggerDownload();
}
showDisclaimer();
Log.i("oncreate", "finished!");
return;
}
triggerDownload();
showDisclaimer();
Log.i("oncreate", "finished!");
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void dropOldSchedule(){
if(pd!=null && pd.isShowing())
pd.setTitle("Getting upload date...");
else
pd = ProgressDialog.show(this, "Getting upload date",
"This may take a few minutes...", true, false);
dropThread.start();
}
public void triggerDownload() {
if (!checkInternet()) {
showAlert("An internet connection is required to perform an update, please check that you are connected to the internet");
return;
}
if(pd!=null && pd.isShowing())
pd.setTitle("Getting upload date...");
else
pd = ProgressDialog.show(this, "Getting upload date",
"This may take a few minutes...", true, false);
downloadThread.start();
}
public void getUploadDate() {
Log.d("getUploadDate", "getting upload date of schedule");
if(pd!=null && pd.isShowing())
pd.setTitle("Getting upload date...");
else
pd = ProgressDialog.show(this, "Getting upload date",
"This may take a few minutes...", true, false);
getUploadDateThread.start();
}
public void writeUploadDateInTextFile() {
Log.d("writeUploadDateTextFile", "writing:"+str);
try {
OutputStreamWriter out = new OutputStreamWriter(openFileOutput(
"update.txt", 0));
out.write(str);
out.close();
} catch (java.io.IOException e) {
e.printStackTrace();
}
}
public void showDisclaimer() {
Log.d("ShowDisclaimer", "showing disclaimer");
homeText3
.setText("..." + str
+ "...");
homeText1.setVisibility(View.VISIBLE);
homeText2.setVisibility(View.VISIBLE);
homeText3.setVisibility(View.VISIBLE);
homeText4.setVisibility(View.VISIBLE);
Log.d("showDisclaimer", "finished showing disclaimer");
}
public boolean uploadDateEqualsDateInFile() {
Log.d("uploadDateEqualsDateInFile","comparing schedule upload dates");
try {
String recordedDate = "";
InputStream instream = openFileInput("update.txt");
if (instream != null) { // if file the available for reading
Log.d("uploadDateEqualsDateInFile","update.txt found!");
InputStreamReader inputreader = new InputStreamReader(instream);
BufferedReader buffreader = new BufferedReader(inputreader);
String line = null;
while ((line = buffreader.readLine()) != null) {
recordedDate = line;
Log.d("uploadDateEqualsDateInFile","recorded:"+recordedDate);
}
Log.d("uploadDateEqualsDateInFile","last upload date: " + str + ", recorded:" +recordedDate);
if(str.equals(recordedDate)) return true;
return false;
}
Log.d("uploadDateEqualsDateInFile","update.txt is null!");
return false;
} catch (FileNotFoundException e) {
e.printStackTrace();
return false;
} catch (IOException e) {
e.printStackTrace();
return false;
}
}
public boolean checkInternet() {
ConnectivityManager cm = (ConnectivityManager) this
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo infos[] = cm.getAllNetworkInfo();
for (NetworkInfo info : infos)
if (info.getState() == NetworkInfo.State.CONNECTED
|| info.getState() == NetworkInfo.State.CONNECTING) {
return true;
}
return false;
}
public boolean dbExists() {
File database=getApplicationContext().getDatabasePath(DatabaseHandler.DATABASE_NAME);
if (!database.exists()) {
Log.i("Database", "Not Found");
return false;
}
Log.i("Database", "Found");
return true;
}
#Override
protected void onDestroy() {
super.onDestroy();
if (db != null) {
db.close();
}
}
#Override
protected void onPause() {
super.onPause();
if (db != null) {
db.close();
}
}
}

Sorry but I couldn't find mistakes or problems in your code. But I would strongly recommend you to use AsyncTask for doing something in different thread. AsyncTask is very easy to use and I would say that it is one of the biggest advantages of java. I really miss it in obj-c.
http://labs.makemachine.net/2010/05/android-asynctask-example/
http://marakana.com/s/video_tutorial_android_application_development_asynctask_preferences_and_options_menu,257/index.html
check those links hope that will help you.

It was already mentioned that AsyncTask is the better alternative. However, it may be the case, that your call to join will throw InterruptedException. Try to use it like this:
while(getUploadDateThread.isRunning()){
try{
getUploadDateThread.join();
} catch (InterruptedException ie){}
}
// code after join

I think the problem that your facing is that you are blocking the UI thread when you call join in the onCreate() method. You should move this code into another thread which should execute in the background and once its done you can update the UI.
Here is a sample code:
final Thread t1 = new Thread();
final Thread t2 = new Thread();
t1.start();
t2.start();
new Thread(new Runnable() {
#Override
public void run() {
// Perform all your thread joins here.
try {
t1.join();
t2.join();
} catch (Exception e) {
// TODO: handle exception
}
// This thread wont move forward unless all your threads
// mentioned above are executed or timed out.
// ------ Update UI using this method
runOnUiThread(new Runnable() {
#Override
public void run() {
// Update UI code goes here
}
});
}
}).start();

java.lang.NullPointerException at android.content.ContextWrapper.getPackageManager

I am getting this error
java.lang.NullPointerException at android.content.ContextWrapper.getPackageManager
when am trying to get list of all installed applications on the device.
I have a server that starts when my application is started, and the client pings the server and asks to get a list of installed applications. The Server then asks the getPackageManager() and gets all the installed applications.
But the getPackageManager throws a NullPointerException.
The Server is written in a java and is started from my android application.
Could someone please tell me what am missing and why I am getting this error?
Please find the code below
public class ApplicationRecognition extends Activity {
// android.os.Debug.waitForDebugger();
Button buttonStart, buttonStop;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
buttonStart = (Button) findViewById(R.id.buttonStart);
buttonStop = (Button) findViewById(R.id.buttonStop);
final SecurityModuleServer server = new SecurityModuleServer(5902);
server.start();
Toast.makeText(this, "Application Server is started", Toast.LENGTH_SHORT).show();
buttonStart.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
startService(new Intent(getBaseContext(), AppReconService.class));
}});
buttonStop.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
stopService(new Intent(getBaseContext(), AppReconService.class));
}});
}
public String[] getInstalledApplications()
{
String[] appname =new String[10];
Intent mainIntent = new Intent(Intent.ACTION_MAIN,null);
mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
PackageManager manager = getPackageManager();
List<ResolveInfo> pkgAppsList = manager.queryIntentActivities(mainIntent, 0);
appname = new String[pkgAppsList.size()];
for(int i=0;i<pkgAppsList.size();i++)
{
appname[i]=pkgAppsList.get(i).activityInfo.packageName;
}
return appname;
}
}
the server side code
public class SecurityModuleServer implements Observer,Runnable
{
private int numberOfConnectedClient;
private Thread serverThread;
private ServerSocket serverSocket;
private volatile boolean isServerRunning;
public SecurityModuleServer(final int port)
{
numberOfConnectedClient = 0;
try
{
serverSocket = new ServerSocket(port);
} catch (IOException e) {
e.printStackTrace();
}
}
public void run()
{
System.out.println("SecurityModuleServer>> server thread started."); //$NON-NLS-1$
while(isServerRunning)
{
numberOfConnectedClient++;
try
{
SecurityModuleClientThread client = new SecurityModuleClientThread(serverSocket.accept(), numberOfConnectedClient);
client.addObserver(this);
client.start();
}
catch (IOException e)
{
e.printStackTrace();
}
}
System.out.println("SecurityModuleServer>> server thread stopped."); //$NON-NLS-1$
}
synchronized public void start()
{
serverThread = new Thread(this);
isServerRunning = true;
serverThread.start();
}
synchronized public void stop()
{
isServerRunning = false;
}
public boolean isRunning()
{
return isServerRunning;
}
public static void main(String[] args)
{
SecurityModuleServer server = new SecurityModuleServer(5903);
server.start();
}
public void update(Observable o, Object arg)
{
numberOfConnectedClient--;
}
}
the client side code
public SecurityModuleClientThread(Socket socket, int numberOfClient)
{
clientSocket = socket;
numberOfConnectedClient = numberOfClient;
try
{
printOut = new PrintStream(clientSocket.getOutputStream());
readerIn = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
clientThread = new Thread(this);
}
catch (IOException e)
{
e.printStackTrace();
}
}
public void run()
{
Looper.prepare();
String input = ""; //$NON-NLS-1$
System.out.println("SecurityModuleClientThread>> thread started for client."); //$NON-NLS-1$
if (numberOfConnectedClient <= MAX_ALLOWED_CLIENTS)
{
printOut.println(CMD+Answer_Open_Connection+SEPARATOR+M002);
while(isClientRunning)
{
try
{
input = readerIn.readLine();
System.out.println("Message received>> "+input); //$NON-NLS-1$
parseInputMessage(input);
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
else
{
printOut.println(CMD+Error+SEPARATOR+M003);
stop();
}
System.out.println("SecurityModuleClientThread>> thread stopped for client."); //$NON-NLS-1$
}
private void parseInputMessage(final String input)
{
if (input.equalsIgnoreCase(CMD+Request_Close_Connection))
{
printOut.println(CMD+Answer_Close_Connection+SEPARATOR+M007);
stop();
}
else
{
String messages[] = input.split(SEPARATOR);
// Parse the command
switch(parseCommand(messages[0]))
{
case Request_Start_Application:
if(parseApplicationName(input) != null)
{
if(startAndroidApplication(parseApplicationName(input)))
{
// TODO
printOut.println(CMD+Answer_Start_Application);
startAndroidApplication(parseApplicationName(input));
}
else
{
printOut.println(CMD+Error+SEPARATOR+M004);
}
}
else
{
printOut.println(CMD+Error+SEPARATOR+M004);
}
break;
case Request_Stop_Application:
if(parseApplicationName(input) != null)
{
if (stopAndroidApplication(parseApplicationName(input)))
{
// TODO
printOut.println(CMD+Answer_Stop_Application);
}
else
{
printOut.println(CMD+Error+SEPARATOR+M004);
}
}
else
{
printOut.println(CMD+Error+SEPARATOR+M004);
}
break;
case Request_Application_Installed:
String[] appnames = new String[provideInstalledApplication().length];
appnames = provideInstalledApplication();
for(int i=0;i<appnames.length;i++)
{
printOut.println(appnames[i]);
}
break;
case Request_Application_Running:
//TODO
break;
default:
printOut.println(CMD+Error+SEPARATOR+M008);
break;
}
}
}
private int parseCommand(String cmd)
{
if (cmd.length() == 6)
{
return Integer.parseInt(cmd.substring(3, 6));
}
else
{
return 0;
}
}
private String parseApplicationName(String message)
{
if (message.length() > 6)
{
// TODO
return message.substring(6, message.length());
}
else
{
return null;
}
}
public synchronized void start()
{
isClientRunning = true;
clientThread = new Thread(this);
clientThread.start();
}
public synchronized void stop()
{
printOut.close();
try
{
readerIn.close();
clientSocket.close();
}
catch (IOException e)
{
e.printStackTrace();
}
finally
{
isClientRunning = false;
setChanged();
notifyObservers();
}
}
public boolean isRunning()
{
return isClientRunning;
}
public String[] provideInstalledApplication()
{
String[] appnames = null;
ApplicationRecognition apprecon = new ApplicationRecognition();
appnames=new String[apprecon.getInstalledApplications().length];
appnames = apprecon.getInstalledApplications();
return appnames;
}
public String[] provideRunningApplication()
{
// TODO Auto-generated method stub
return null;
}
public boolean startAndroidApplication(String applicationName)
{
// TODO Auto-generated method stub
ApplicationRecognition apprecon = new ApplicationRecognition();
apprecon.startApplication(applicationName);
return false;
}
public boolean stopAndroidApplication(String applicationName)
{
// TODO Auto-generated method stub
return false;
}
}
The main part that is giving me trouble is in ApplicationRecognition class under method getInstalledApplications() in getPackageManager is null.
This method is called from the client side SecurityModuleClientThread class, provideInstalledApplication method.
Can someone please tell me where am I going wrong.