Updated on 2026-08-14

app/src/main/java/com/tangem/data/fingerprint/FingerprintHelper.java

@@ -0,0 +1,62 @@
+package com.tangem.data.fingerprint;
+
+import android.annotation.TargetApi;
+import android.hardware.fingerprint.FingerprintManager;
+import android.os.Build;
+import android.os.CancellationSignal;
+
+/**
+ * Created by dtaka on 8/20/2016.
+ */
+@TargetApi(Build.VERSION_CODES.M)
+public class FingerprintHelper extends FingerprintManager.AuthenticationCallback {
+    private FingerprintHelperListener listener;
+
+    public FingerprintHelper(FingerprintHelperListener listener) {
+        this.listener = listener;
+    }
+
+    private CancellationSignal cancellationSignal;
+
+    public void startAuth(FingerprintManager manager, FingerprintManager.CryptoObject cryptoObject) {
+        cancellationSignal = new CancellationSignal();
+
+        try {
+            manager.authenticate(cryptoObject, cancellationSignal, 0, this, null);
+        } catch (SecurityException ex) {
+            listener.authenticationFailed("An error occurred:\n" + ex.getMessage());
+        } catch (Exception ex) {
+            listener.authenticationFailed("An error occurred\n" + ex.getMessage());
+        }
+    }
+
+    public void cancel() {
+        if (cancellationSignal != null)
+            cancellationSignal.cancel();
+    }
+
+    public interface FingerprintHelperListener {
+        public void authenticationFailed(String error);
+        public void authenticationSucceeded(FingerprintManager.AuthenticationResult result);
+    }
+
+    @Override
+    public void onAuthenticationError(int errMsgId, CharSequence errString) {
+        listener.authenticationFailed("Authentication error\n" + errString);
+    }
+
+    @Override
+    public void onAuthenticationHelp(int helpMsgId, CharSequence helpString) {
+        listener.authenticationFailed("Authentication help\n" + helpString);
+    }
+
+    @Override
+    public void onAuthenticationFailed() {
+        listener.authenticationFailed("Authentication failed.");
+    }
+
+    @Override
+    public void onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) {
+        listener.authenticationSucceeded(result);
+    }
+}