Develop Reference

How to choose a Phone Call in Android

When I click phone call button, how to choose skype, viber, sim1 or sim2, ect. Now, it is called by sim2. I want to choose. I search on Google, no found my problem.
Intent intent = new Intent(Intent.ACTION_CALL);
intent.setData(Uri.parse("tel:" + "123456789"));
try {
startActivity(intent);
} catch (Exception e) {
e.printStackTrace();
}
Permissions in Manifest
<uses-permission android:name="android.permission.CALL_PHONE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>

Reset App preferences before starting intent
Settings->Apps/Application Manager -> Default/Downloaded Apps -> Click on overflow icon (i.e. three dots icon on top right of the screen) -> Reset App Preferences.
Your code looks fine.
Intent intent = new Intent(Intent.ACTION_DIAL);
intent.setData(Uri.parse("tel:" + "123456789"));
try {
startActivity(intent);
} catch (Exception e) {
e.printStackTrace();
}

You need to create a sim chooser dialog and set sim 1 and sim 2 options and set simNumber variable according to the choosen sim number(0 for sim1 and 1 for sim2)
Here is the code that I have implemented for calling from specific sim i.e. SIM 1 or SIM 2.
code:
private final static String simSlotName[] = {
"extra_asus_dial_use_dualsim",
"com.android.phone.extra.slot",
"slot",
"simslot",
"sim_slot",
"subscription",
"Subscription",
"phone",
"com.android.phone.DialingMode",
"simSlot",
"slot_id",
"simId",
"simnum",
"phone_type",
"slotId",
"slotIdx"
};
int simNumber = 0 or 1; //0 for sim1 and 1 for sim2
Intent callIntent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:"
+ phoneNumber));
callIntent.setFlags(Intent.FLAG_ACTIVITY_MULTIPLE_TASK);
callIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//Add slots here since different device needs different key so put all together
for (String s : simSlotName)
intent.putExtra(s, simNumber);
//This will only work on API 22 or up
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
intent.putExtra("android.telecom.extra.PHONE_ACCOUNT_HANDLE", (Parcelable) SimSlotHelper.getAccountHandles(context).get(simNumber))
context.startActivity(intent);
Here is a class for sim slot helper which will get phone account handle list by using telecom manager for both sims
code:
public class SimSlotHelper {
public static List getAccountHandles(Context context) {
Class c;
Method m;
TelecomManager telecomManager;
List<PhoneAccountHandle> accountHandles;
TelephonyManager telephony;
telephony = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
try {
c = Class.forName("android.telecom.TelecomManager");
Method m1 = c.getMethod("from", Context.class);
telecomManager = (TelecomManager) m1.invoke(null, context);
m = c.getMethod("getCallCapablePhoneAccounts");
accountHandles = (List<PhoneAccountHandle>) m.invoke(telecomManager);
return accountHandles;
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
return null;
}
}

Try using .ACTION_DIAL instead of .ACTION_CALL . This opens a Dialog chooser with apps installed in the device with capability of calling.
Intent intent = new Intent(Intent.ACTION_DIAL);
intent.setData(Uri.parse("tel:" + "123456789"));
try {
startActivity(intent);
} catch (Exception e) {
e.printStackTrace();
}

How to wait until user enables mobile data and send mail?

I have a task in which I have to send E-Mail each day once.
I used Service triggered by AlarmManager to achieve this. It's working properly. But the problem is the mail gets send only if the mobile data is available. So I tried to turn on the data connection and send mail. Mobile data is enabled but, Mail not sending. I have posted here what I've tried. Someone please suggest a method to wait until the user turn on mobile data and send mail. Thank you.
cm=(ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
ni=cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
isConnected=ni!=null&&ni.isConnected();
Mail m=new Mail("xxxxxxxxx#gmail.com","xxxxxxx");
String[] strTo={"xxxxxxxxx#gmail.com"};
m.setTo(strTo);
m.setFrom("xxxxxxxxxx#gmail.com");
m.setSubject("Subject");
m.setBody("Please find the attachment");
try{
m.addAttachment(Environment.getExternalStorageDirectory() + "/xxxxx/xxxxxx.xx");
if (isConnected){
m.send();
}else {
ConnectivityManager dataManager;
dataManager = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
Method dataMtd = null;
try {
dataMtd = ConnectivityManager.class.getDeclaredMethod("setMobileDataEnabled", boolean.class);
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
dataMtd.setAccessible(true);
try {
dataMtd.invoke(dataManager, true);
} catch (IllegalArgumentException | IllegalAccessException | InvocationTargetException e) {
e.printStackTrace();
}
NetworkInfo netInfo=dataManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
boolean isOnline=netInfo!=null&&netInfo.isConnected();
if(isOnline){
if (m.send()){
ConnectivityManager dataManager1;
dataManager1 = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
Method dataMtd1 = null;
try {
dataMtd1 = ConnectivityManager.class.getDeclaredMethod("setMobileDataEnabled", boolean.class);
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
dataMtd1.setAccessible(false);
try {
dataMtd1.invoke(dataManager1, false);
} catch (IllegalArgumentException | IllegalAccessException | InvocationTargetException e) {
e.printStackTrace();
}
}
}
}
}catch (final Exception e){
e.printStackTrace();
Log.v("My_Service",e.toString());
}

You need to have BroadcastReceiver listening to change in data connectivity. Refer to - http://developer.android.com/reference/android/content/BroadcastReceiver.html
Check this for reference specific to network connectivity - Check INTENT internet connection

Don't relay on Google shit api... Info to the user to enable data + post delayed eg time task :) u can not handle all problems by enabling data.. But u can check for most : There could by a firewall issue , DNS issue, TTL issue when theter etc

You can register a BroadcastReceiver to be notified when a Mobile data is enabled.
Register the BroadcastReceiver:
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION));
registerReceiver(broadcastReceiver, intentFilter);
And then in your BroadcastReceiver do something like this:
#Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if (action.equals(ConnectivityManager.CONNECTIVITY_ACTION))) {
if (intent.getBooleanExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, false)){
// data connection was lost
} else {
// do your stuff
}
}
}
For more info, see the documentation for BroadcastReceiver
You can use below link to send mail :
How to send mail without user interaction from another application

Pairing two android bluetooth devices without any passkey popup

I want to pair two android bluetooth devices (Kitkat) without any popup for passkey exchange. I tried setpin() and cancelPairingUserInput() methods inside the broadcast receiver for PAIRING_REQUEST intent using reflection, but got no results. Can anyone help me with that ?
if(BluetoothDevice.ACTION_PAIRING_REQUEST.equals(action)){
BluetoothDevice localBluetoothDevice = (BluetoothDevice)intent.getParcelableExtra("android.bluetooth.device.extra.DEVICE");
try {
Log.d("setPin()", "Try to set the PIN");
Method m = localBluetoothDevice.getClass().getMethod("setPin", byte[].class);
m.invoke(localBluetoothDevice, ByteBuffer.allocate(4).putInt(1234).array());
Log.d("setPin()", "Success to add the PIN.");
} catch (Exception e) {
Log.e("setPin()", e.getMessage());
}
Class localClass = localBluetoothDevice.getClass();
Class[] arrayOfClass = new Class[0];
try {
localClass.getMethod("setPairingConfirmation", boolean.class).invoke(localBluetoothDevice, true);
localClass.getMethod("cancelPairingUserInput", arrayOfClass).invoke(localBluetoothDevice, null);
} catch (IllegalAccessException | IllegalArgumentException
| InvocationTargetException | NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

Did you try calling createBond() through reflection?
This works for me, with device being a BluetoothDevice:
Method m = device.getClass().getMethod("createBond", (Class[]) null);
m.invoke(device, (Object[]) null);

Get the device and the PIN (or the pairing key) from the given Intent
if the given PIN is not -1, set it in the device
invoke the device's .setPairingConfirmation() method
My code (which achieves this) in the .bluetoothEventReceived() callback method, looks something like this:
private void bluetoothEventRecieved(Context context, Intent intent)
{
if (BluetoothDevice.ACTION_PAIRING_REQUEST.equals(action)) {
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
int pin = intent.getIntExtra(BluetoothDevice.EXTRA_PAIRING_KEY, -1);
if (pin != -1) {
byte[] pinBytes = String.format(Locale.US, "%04d", pin).getBytes();
device.setPin(pinBytes);
}
device.setPairingConfirmation(true);
}
}

Android Bluetooth Printing

I am writing an application which sends data to bluetooth printer. Can anyone help me ? how can I use android Bluetooth Stack for printing? or is there any external api or sdk to use?
Here is my code for searching bluetooth...
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
registerReceiver(ActionFoundReceiver,
new IntentFilter(BluetoothDevice.ACTION_FOUND));
private final BroadcastReceiver ActionFoundReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device = intent
.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
btArrayAdapter.add(device.getName() + "\n"
+ device.getAddress());
btArrayAdapter.notifyDataSetChanged();
}
}
};
and here is my code for sending data to printer..
BluetoothDevice mDevice = bluetoothAdapter.getRemoteDevice("00:15:FF:F2:56:A4");
Method m = mDevice.getClass().getMethod("createRfcommSocket",
new Class[] { int.class });
mBTsocket = (BluetoothSocket) m.invoke(mDevice, 1);
System.out.println("Connecting.....");
mBTsocket.connect();
System.out.println("Connected");
OutputStream os = mBTsocket.getOutputStream();
os.flush();
os.write(Receipt.getBytes());
// mBTsocket.close();
When I write socket.close() , data is not getting print to printer as socket connection getting closed before printing data..and if I didn't write socket.close() then data is getting printed only once.. I would not be able to print data second time until I restart bluetooth of my phone.
can any one have solution for it??? or is there any other way to get rid of this printing??

I got the solution of my problem...
if i want to print data more than one time then you dont need to create new Socket Connection with the device... instead call outputstream.write(bytes) method.
and in the end if you want to disconnect device then call mBTScoket.close() method to disconnect device.

You can use printooth library for any printer, printooth is simple and well documented,
https://github.com/mazenrashed/Printooth
var printables = ArrayList<Printable>()
var printable = Printable.PrintableBuilder()
.setText("Hello World") //The text you want to print
.setAlignment(DefaultPrinter.ALLIGMENT_CENTER)
.setEmphasizedMode(DefaultPrinter.EMPHASISED_MODE_BOLD) //Bold or normal
.setFontSize(DefaultPrinter.FONT_SIZE_NORMAL)
.setUnderlined(DefaultPrinter.UNDELINED_MODE_ON) // Underline on/off
.setCharacterCode(DefaultPrinter.CHARACTER_CODE_USA_CP437) // Character code to support languages
.setLineSpacing(DefaultPrinter.LINE_SPACING_60)
.setNewLinesAfter(1) // To provide n lines after sentence
.build()
printables.add(printable)
BluetoothPrinter.printer().print(printables)

If you have made connection to the devices and paired it.
So for printing, printer wants the byte. SO I have createed a mothod.
Simply call this method and pass the String inside it to get printed.
String str = new String("This is the text sending to the printer");
private void printData() {
// TODO Auto-generated method stub
String newline = "\n";
try {
out.write(str.getBytes(),0,str.getBytes().length);
Log.i("Log", "One line printed");
} catch (IOException e) {
Toast.makeText(BluetoothDemo.this, "catch 1", Toast.LENGTH_LONG).show();
e.printStackTrace();
Log.i("Log", "unable to write ");
flagCheck = false;
}
try {
out.write(newline.getBytes(),0,newline.getBytes().length);
} catch (IOException e) {
Log.i("Log", "Unable to write the new line::");
e.printStackTrace();
flagCheck = false;
}
flagCheck = true;
}

Finding UUIDs in Android 2.0

I am writing a program which needs to be run in Android 2.0. I am currently trying to connect my android device to an embedded bluetooth chip. I have been given information as to use fetchuidsWithSDP(), or getUuids(), but the page I read explained that these methods are hidden in the 2.0 SDK, and must be called using reflection. I have no idea what that means and there is no explanation. There is example code given, but very little explanation behind it. I was hoping someone could help me understand what is actually going on here, as I am very new to Android development.
String action = "android.bleutooth.device.action.UUID";
IntentFilter filter = new IntentFilter( action );
registerReceiver( mReceiver, filter );
The page I read also says that in the first line bluetooth is spelled "bleutooth" on purpose. If anyone can explain that, I would appreciate that as well as it makes no sense to me, unless the developers made a typo.
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
#Override
public void onReceive( Context context, Intent intent ) {
BluetoothDevice deviceExtra = intent.getParcelableExtra("android.bluetooth.device.extra.Device");
Parcelable[] uuidExtra = intent.getParcelableArrayExtra("android.bluetooth.device.extra.UUID");
}
};
I am having trouble grasping how exactly I find the correct UUID for my embedded bluetooth chip. If anyone could help it'd be greatly appreciated.
EDIT: I am going to add the rest of my onCreate() method so you can see what I'm working with.
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Set up window View
setContentView(R.layout.main);
// Initialize the button to scan for other devices.
btnScanDevice = (Button) findViewById( R.id.scandevice );
// Initialize the TextView which displays the current state of the bluetooth
stateBluetooth = (TextView) findViewById( R.id.bluetoothstate );
startBluetooth();
// Initialize the ListView of the nearby bluetooth devices which are found.
listDevicesFound = (ListView) findViewById( R.id.devicesfound );
btArrayAdapter = new ArrayAdapter<String>( AndroidBluetooth.this,
android.R.layout.simple_list_item_1 );
listDevicesFound.setAdapter( btArrayAdapter );
CheckBlueToothState();
// Add an OnClickListener to the scan button.
btnScanDevice.setOnClickListener( btnScanDeviceOnClickListener );
// Register an ActionFound Receiver to the bluetooth device for ACTION_FOUND
registerReceiver( ActionFoundReceiver, new IntentFilter( BluetoothDevice.ACTION_FOUND ) );
// Add an item click listener to the ListView
listDevicesFound.setOnItemClickListener( new OnItemClickListener()
{
public void onItemClick(AdapterView<?> arg0, View arg1,int arg2, long arg3)
{
// Save the device the user chose.
myBtDevice = btDevicesFound.get( arg2 );
// Open a socket to connect to the device chosen.
try {
btSocket = myBtDevice.createRfcommSocketToServiceRecord( MY_UUID );
} catch ( IOException e ) {
Log.e( "Bluetooth Socket", "Bluetooth not available, or insufficient permissions" );
} catch ( NullPointerException e ) {
Log.e( "Bluetooth Socket", "Null Pointer One" );
}
// Cancel the discovery process to save battery.
myBtAdapter.cancelDiscovery();
// Update the current state of the Bluetooth.
CheckBlueToothState();
// Attempt to connect the socket to the bluetooth device.
try {
btSocket.connect();
// Open I/O streams so the device can send/receive data.
iStream = btSocket.getInputStream();
oStream = btSocket.getOutputStream();
} catch ( IOException e ) {
Log.e( "Bluetooth Socket", "IO Exception" );
} catch ( NullPointerException e ) {
Log.e( "Bluetooth Socket", "Null Pointer Two" );
}
}
});
}

You're probably better off using the synchronous version so you don't have to deal with all the moving parts of setting up the BroadcastReceiver. Since you are always doing this on the heels of discovery, the cached data will always be fresh.
Here the functionality of getting the UUID data encapsulated up into a method. This code was in one of the comments of the blog post you linked:
//In SDK15 (4.0.3) this method is now public as
//Bluetooth.fetchUuisWithSdp() and BluetoothDevice.getUuids()
public ParcelUuid[] servicesFromDevice(BluetoothDevice device) {
try {
Class cl = Class.forName("android.bluetooth.BluetoothDevice");
Class[] par = {};
Method method = cl.getMethod("getUuids", par);
Object[] args = {};
ParcelUuid[] retval = (ParcelUuid[]) method.invoke(device, args);
return retval;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
You can then call this method anywhere in your code, passing it a BluetoothDevice and getting back an array of UUIDs for that device's services (typically for small embedded stacks the array is only 1 item); something like:
// Save the device the user chose.
myBtDevice = btDevicesFound.get( arg2 );
//Query the device's services
ParcelUuid[] uuids = servicesFromDevice(myBtDevice);
// Open a socket to connect to the device chosen.
try {
btSocket = myBtDevice.createRfcommSocketToServiceRecord(uuids[0].getUuid());
} catch ( IOException e ) {
Log.e( "Bluetooth Socket", "Bluetooth not available, or insufficient permissions" );
} catch ( NullPointerException e ) {
Log.e( "Bluetooth Socket", "Null Pointer One" );
}
in the block you posted above.
As a side note, calling all this code in the manner you have will make your application sad later. The block of code calling connect() and obtaining the streams should be done on a background thread because that method will block for a period of time and calling this code on the main thread will freeze your UI temporarily. You should move that code into an AsyncTask or a Thread like the BluetoothChat sample in the SDK does.
HTH

I also faced the same issue and this is how I solved it for Android 2.3.3. I think the same solution will work for android 2.2 also.
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
#SuppressLint("NewApi")
#Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
// When discovery finds a device
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Get the BluetoothDevice object from the Intent
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
Toast.makeText(getApplicationContext(),"Device: "+device.getName(),Toast.LENGTH_SHORT).show();
devices.add(device.getName() + "\n" + device.getAddress());
list.add(device);
}
else if(BluetoothDevice.ACTION_UUID.equals(action)){
Toast.makeText(getApplicationContext(),"I am Here",Toast.LENGTH_SHORT).show();
}
else {
if(BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
Toast.makeText(getApplicationContext(),"Done Scanning..",Toast.LENGTH_SHORT).show();
Iterator<BluetoothDevice> itr = list.iterator();
while(itr.hasNext())
{
BluetoothDevice dev=itr.next();
if(dev.fetchUuidsWithSdp())
{
Parcelable a[]=dev.getUuids();
Toast.makeText(getApplicationContext(),dev.getName()+":"+a[0],Toast.LENGTH_SHORT).show();
}
}
}
}
}
};