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package com.example.android.bluetoothadvertisements;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.le.AdvertiseCallback;
import android.bluetooth.le.AdvertiseData;
import android.bluetooth.le.AdvertiseSettings;
import android.bluetooth.le.BluetoothLeAdvertiser;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Switch;
import android.widget.Toast;
/**
* Allows user to start & stop Bluetooth LE Advertising of their device.
*/
public class AdvertiserFragment extends Fragment {
private BluetoothAdapter mBluetoothAdapter;
private BluetoothLeAdvertiser mBluetoothLeAdvertiser;
private AdvertiseCallback mAdvertiseCallback;
private Switch mSwitch;
/**
* Must be called after object creation by MainActivity.
*
* @param btAdapter the local BluetoothAdapter
*/
public void setBluetoothAdapter(BluetoothAdapter btAdapter) {
this.mBluetoothAdapter = btAdapter;
mBluetoothLeAdvertiser = mBluetoothAdapter.getBluetoothLeAdvertiser();
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_advertiser, container, false);
mSwitch = (Switch) view.findViewById(R.id.advertise_switch);
mSwitch.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
onSwitchClicked(v);
}
});
return view;
}
@Override
public void onStop() {
super.onStop();
if(mAdvertiseCallback != null){
stopAdvertising();
}
}
/**
* Called when switch is toggled - starts or stops advertising.
*
* @param view is the Switch View object
*/
public void onSwitchClicked(View view) {
// Is the toggle on?
boolean on = ((Switch) view).isChecked();
if (on) {
startAdvertising();
} else {
stopAdvertising();
}
}
/**
* Starts BLE Advertising.
*/
private void startAdvertising() {
mAdvertiseCallback = new SampleAdvertiseCallback();
if (mBluetoothLeAdvertiser != null) {
mBluetoothLeAdvertiser.startAdvertising(buildAdvertiseSettings(), buildAdvertiseData(),
mAdvertiseCallback);
} else {
mSwitch.setChecked(false);
Toast.makeText(getActivity(), getString(R.string.bt_null), Toast.LENGTH_LONG).show();
}
}
/**
* Stops BLE Advertising.
*/
private void stopAdvertising() {
if (mBluetoothLeAdvertiser != null) {
mBluetoothLeAdvertiser.stopAdvertising(mAdvertiseCallback);
mAdvertiseCallback = null;
} else {
mSwitch.setChecked(false);
Toast.makeText(getActivity(), getString(R.string.bt_null), Toast.LENGTH_LONG).show();
}
}
/**
* Returns an AdvertiseData object which includes the Service UUID and Device Name.
*/
private AdvertiseData buildAdvertiseData() {
// Note: There is a strict limit of 31 Bytes on packets sent over BLE Advertisements.
// This includes everything put into AdvertiseData including UUIDs, device info, &
// arbitrary service or manufacturer data.
// Attempting to send packets over this limit will result in a failure with error code
// AdvertiseCallback.ADVERTISE_FAILED_DATA_TOO_LARGE. Catch this error in the
// onStartFailure() method of an AdvertiseCallback implementation.
AdvertiseData.Builder dataBuilder = new AdvertiseData.Builder();
dataBuilder.addServiceUuid(Constants.Service_UUID);
dataBuilder.setIncludeDeviceName(true);
return dataBuilder.build();
}
/**
* Returns an AdvertiseSettings object set to use low power (to help preserve battery life).
*/
private AdvertiseSettings buildAdvertiseSettings() {
AdvertiseSettings.Builder settingsBuilder = new AdvertiseSettings.Builder();
settingsBuilder.setAdvertiseMode(AdvertiseSettings.ADVERTISE_MODE_LOW_POWER);
return settingsBuilder.build();
}
/**
* Custom callback after Advertising succeeds or fails to start.
*/
private class SampleAdvertiseCallback extends AdvertiseCallback {
@Override
public void onStartFailure(int errorCode) {
super.onStartFailure(errorCode);
mSwitch.setChecked(false);
String errorMessage = getString(R.string.start_error_prefix);
switch (errorCode) {
case AdvertiseCallback.ADVERTISE_FAILED_ALREADY_STARTED:
errorMessage += " " + getString(R.string.start_error_already_started);
break;
case AdvertiseCallback.ADVERTISE_FAILED_DATA_TOO_LARGE:
errorMessage += " " + getString(R.string.start_error_too_large);
break;
case AdvertiseCallback.ADVERTISE_FAILED_FEATURE_UNSUPPORTED:
errorMessage += " " + getString(R.string.start_error_unsupported);
break;
case AdvertiseCallback.ADVERTISE_FAILED_INTERNAL_ERROR:
errorMessage += " " + getString(R.string.start_error_internal);
break;
case AdvertiseCallback.ADVERTISE_FAILED_TOO_MANY_ADVERTISERS:
errorMessage += " " + getString(R.string.start_error_too_many);
break;
}
Toast.makeText(getActivity(), errorMessage, Toast.LENGTH_LONG).show();
}
@Override
public void onStartSuccess(AdvertiseSettings settingsInEffect) {
super.onStartSuccess(settingsInEffect);
// Don't need to do anything here, advertising successfully started.
}
}
}
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