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我正在開發一個應該在後臺工作的指紋手勢應用程序，並不斷偵聽用戶輸入的指紋以執行所需的操作。到目前爲止，我已嘗試使用IntentService使指紋掃描儀在後臺工作，但只要關閉活動或將其最小化，指紋掃描儀就會停止工作。即使在我的活動結束之後，有什麼方法可以在後臺使用指紋掃描儀？ 這裏是我的代碼在後臺連續收聽Android設備上的指紋
MainActivity.java
public class MainActivity extends AppCompatActivity {
private static final String KEY_NAME = "secretkey";
private Cipher cipher;
private KeyStore keyStore;
private KeyGenerator keyGenerator;
private FingerprintManager.CryptoObject cryptoObject;
private TextView textView;
private Button auth_button,stop_button;
private FingerprintManager fingerprintManager;
private KeyguardManager keyguardManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
keyguardManager = (KeyguardManager) getSystemService(KEYGUARD_SERVICE);
fingerprintManager = (FingerprintManager) getSystemService(FINGERPRINT_SERVICE);
textView=(TextView)findViewById(R.id.authStatus);
auth_button=(Button)findViewById(R.id.auth_button);
stop_button=(Button)findViewById(R.id.stop_button);
if (!fingerprintManager.isHardwareDetected()) {
textView.setText("Your device doesn't support fingerprint authentication");
}
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) {
textView.setText("Please enable the fingerprint permission");
}
if (!fingerprintManager.hasEnrolledFingerprints()) {
textView.setText("No fingerprint configured. Please register at least one fingerprint in your device's Settings");
}
if (!keyguardManager.isKeyguardSecure()) {
textView.setText("Please enable lockscreen security in your device's Settings");
}
else {
auth_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(MainActivity.this, "Starting service", Toast.LENGTH_SHORT).show();
try
{
generateKey();
}
catch(Exception e)
{
e.printStackTrace();
}
if(initCipher())
{
Provider provider=new Provider(fingerprintManager,cryptoObject,MainActivity.this);
Intent intent=new Intent(MainActivity.this,AsyncService.class);
startService(intent);
}
}
});
stop_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
stopService(new Intent(MainActivity.this,AsyncService.class));
Toast.makeText(MainActivity.this, "Service stopped", Toast.LENGTH_SHORT).show();
}
});
}
}
}
private void generateKey() {
try
{
keyStore = KeyStore.getInstance("AndroidKeyStore");
keyGenerator = KeyGenerator.getInstance(KeyProperties.KEY_ALGORITHM_AES, "AndroidKeyStore");
keyStore.load(null);
keyGenerator.init(new
KeyGenParameterSpec.Builder(KEY_NAME,
KeyProperties.PURPOSE_ENCRYPT |
KeyProperties.PURPOSE_DECRYPT)
.setBlockModes(KeyProperties.BLOCK_MODE_CBC)
.setUserAuthenticationRequired(true)
.setEncryptionPaddings(
KeyProperties.ENCRYPTION_PADDING_PKCS7)
.build());
keyGenerator.generateKey();
}
catch (Exception e)
{
e.printStackTrace();
}
}
public boolean initCipher() {
try
{
cipher = Cipher.getInstance(KeyProperties.KEY_ALGORITHM_AES + "/" + KeyProperties.BLOCK_MODE_CBC + "/" + KeyProperties.ENCRYPTION_PADDING_PKCS7);
}
catch (Exception e)
{
throw new RuntimeException("Failed to get Cipher", e);
}
try
{
keyStore.load(null);
SecretKey key = (SecretKey) keyStore.getKey(KEY_NAME, null);
cipher.init(Cipher.ENCRYPT_MODE, key);
return true;
}
catch (KeyPermanentlyInvalidatedException e)
{
return false;
}
catch (Exception e)
{
throw new RuntimeException("Failed to init Cipher", e);
}
}
}
AsyncService.java
public class AsyncService extends IntentService {
private int ONGOING_NOTIFICATION_ID=2346712;
public AsyncService() {
super(AsyncService.class.getName());
}
@Override
protected void onHandleIntent(Intent intent) {
showNotification();
new FingerprintHandler().startAuth(Provider.fpManager,Provider.cryptoObj);
}
public void showNotification() {
Intent notificationIntent = new Intent(this, MainActivity.class);
PendingIntent pendingIntent =
PendingIntent.getActivity(this, 0, notificationIntent, 0);
Notification notification =
new Notification.Builder(this)
.setContentTitle(getText(R.string.notification_title))
.setContentText(getText(R.string.notification_message))
.setSmallIcon(R.drawable.launcher)
.setContentIntent(pendingIntent)
.build();
startForeground(ONGOING_NOTIFICATION_ID, notification);
}
public class FingerprintHandler extends FingerprintManager.AuthenticationCallback {
private CancellationSignal cancellationSignal;
public void startAuth(FingerprintManager manager, FingerprintManager.CryptoObject cryptoObject)
{
cancellationSignal = new CancellationSignal();
if (ActivityCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED)
{
return;
}
manager.authenticate(cryptoObject, cancellationSignal, 0, this, null);
}
@Override
public void onAuthenticationError(int errMsgId, CharSequence errString)
{
}
@Override
public void onAuthenticationFailed()
{
//some action to perform
}
@Override
public void onAuthenticationHelp(int helpMsgId, CharSequence helpString)
{
}
@Override
public void onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result)
{
//some action to perform
}
}
}
Provider.java
public class Provider {
public static FingerprintManager fpManager;
public static FingerprintManager.CryptoObject cryptoObj;
public static Context mContext;
public Provider(FingerprintManager fingerprintManager, FingerprintManager.CryptoObject cryptoObject, Context context) {
fpManager=fingerprintManager;
cryptoObj=cryptoObject;
mContext=context;
}
}