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public abstract class NfcDetectorActivity extends BaseActivity {
private static final String TAG = NfcDetectorActivity.class.getName();
protected NfcAdapter nfcAdapter;
protected IntentFilter[] writeTagFilters;
protected PendingIntent nfcPendingIntent;
protected boolean foreground = false;
protected boolean intentProcessed = false;
protected boolean detecting = true;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d(TAG, "onCreate");
// Check for available NFC Adapter
PackageManager pm = getPackageManager();
if (pm.hasSystemFeature(PackageManager.FEATURE_NFC)) {
initializeNfc();
}
}
/**
*
* Initialize Nfc fields
*
*/
protected void initializeNfc() {
nfcAdapter = NfcAdapter.getDefaultAdapter(this);
nfcPendingIntent = PendingIntent.getActivity(this, 0, new Intent(this,
this.getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
IntentFilter tagDetected = new IntentFilter(
NfcAdapter.ACTION_TAG_DISCOVERED);
IntentFilter ndefDetected = new IntentFilter(
NfcAdapter.ACTION_NDEF_DISCOVERED);
IntentFilter techDetected = new IntentFilter(
NfcAdapter.ACTION_TECH_DISCOVERED);
try {
techDetected.addDataType("*/*");
} catch (MalformedMimeTypeException e) {
e.printStackTrace();
}
writeTagFilters = new IntentFilter[] { ndefDetected, tagDetected,
techDetected };
}
@Override
protected void onResume() {
super.onResume();
if (nfcAdapter != null) {
// enable foreground mode if nfc is on and we have started detecting
boolean enabled = nfcAdapter.isEnabled();
if (enabled && detecting) {
enableForeground();
}
}
if (!intentProcessed) {
intentProcessed = true;
processIntent();
}
}
@Override
protected void onPause() {
super.onPause();
if (nfcAdapter != null) {
disableForeground();
}
}
@Override
public void onNewIntent(Intent intent) {
Log.d(TAG, "onNewIntent");
// onResume gets called after this to handle the intent
intentProcessed = false;
setIntent(intent);
}
protected void enableForeground() {
if (!foreground) {
Log.d(TAG, "Enable nfc forground mode");
nfcAdapter.enableForegroundDispatch(this, nfcPendingIntent,
writeTagFilters, new String[][] { new String[] {
MifareClassic.class.getName(),
NfcA.class.getName(), Ndef.class.getName() } });
foreground = true;
}
}
/**
*
* Start detecting NDEF messages
*
*/
protected void startDetecting() {
if (!detecting) {
enableForeground();
detecting = true;
}
}
/**
*
* Stop detecting NDEF messages
*
*/
protected void stopDetecting() {
if (detecting) {
disableForeground();
detecting = false;
}
}
protected void disableForeground() {
if (foreground) {
Log.d(TAG, "Disable nfc forground mode");
nfcAdapter.disableForegroundDispatch(this);
foreground = false;
}
}
/**
*
* Process the current intent, looking for NFC-related actions
*
*/
public void processIntent() {
Intent intent = getIntent();
// Check to see that the Activity started due to an Android Beam
if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(intent.getAction())) {
Log.d(TAG, "Process NDEF discovered action");
nfcIntentDetected(intent, NfcAdapter.ACTION_NDEF_DISCOVERED);
} else if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(intent.getAction())) {
Log.d(TAG, "Process TAG discovered action");
nfcIntentDetected(intent, NfcAdapter.ACTION_TAG_DISCOVERED);
} else if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(intent.getAction())) {
Log.d(TAG, "Process TECH discovered action");
nfcIntentDetected(intent, NfcAdapter.ACTION_TECH_DISCOVERED);
} else {
Log.d(TAG, "Ignore action " + intent.getAction());
}
}
/**
*
* Launch an activity for nfc (or wireless) settings, so that the user might
* enable or disable nfc
*
*/
@SuppressLint("InlinedApi")
protected void startNfcSettingsActivity() {
if (android.os.Build.VERSION.SDK_INT >= 16) {
startActivity(new Intent(
android.provider.Settings.ACTION_NFC_SETTINGS));
} else {
startActivity(new Intent(
android.provider.Settings.ACTION_WIRELESS_SETTINGS));
}
}
/**
*
* Incoming NFC communication (in form of tag or beam) detected
*
*/
protected abstract void nfcIntentDetected(Intent intent, String action);
} |
