Android 实现面容登录demo源码

以下是一个基本的 Android 实现面容登录的示例代码：

1. 在布局文件中添加一个按钮和一个文本视图：

<Button
    android:id="@+id/btn_face_login"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Face Login" />

<TextView
    android:id="@+id/tv_status"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Status: " />

2. 在 Activity 中初始化 Face ID 检测器，并在按钮点击事件中调用检测器：

public class MainActivity extends AppCompatActivity {

    private static final int REQUEST_CODE_FACEID = 100;

    private FaceManager faceManager;
    private TextView tvStatus;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tvStatus = findViewById(R.id.tv_status);

        faceManager = new FaceManager(this);
        faceManager.initFaceDetector();

        Button btnFaceLogin = findViewById(R.id.btn_face_login);
        btnFaceLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                faceManager.authenticate(REQUEST_CODE_FACEID);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_CODE_FACEID) {
            if (resultCode == RESULT_OK) {
                tvStatus.setText("Status: Face authentication successful");
            } else {
                tvStatus.setText("Status: Face authentication failed");
            }
        }
    }
}

3. 在 FaceManager 类中实现 Face ID 检测器的初始化和身份验证方法：

public class FaceManager {

    private Context context;
    private BiometricPrompt biometricPrompt;
    private Executor executor;

    public FaceManager(Context context) {
        this.context = context;
        this.executor = ContextCompat.getMainExecutor(context);
    }

    public void initFaceDetector() {
        biometricPrompt = new BiometricPrompt((Activity) context, executor, new BiometricPrompt.AuthenticationCallback() {
            @Override
            public void onAuthenticationSucceeded(@NonNull BiometricPrompt.AuthenticationResult result) {
                super.onAuthenticationSucceeded(result);
                ((Activity) context).setResult(Activity.RESULT_OK);
                ((Activity) context).finish();
            }

            @Override
            public void onAuthenticationFailed() {
                super.onAuthenticationFailed();
                ((Activity) context).setResult(Activity.RESULT_CANCELED);
                ((Activity) context).finish();
            }
        });
    }

    public void authenticate(int requestCode) {
        BiometricPrompt.PromptInfo promptInfo = new BiometricPrompt.PromptInfo.Builder()
                .setTitle("Face Login")
                .setSubtitle("Use your face to login")
                .setNegativeButtonText("Cancel")
                .build();
        biometricPrompt.authenticate(promptInfo);
        ((Activity) context).startActivityForResult(biometricPrompt.createPromptIntent(), requestCode);
    }
}

这样，当用户点击面容登录按钮时，将启动系统的面容识别界面，并在成功或失败后返回结果。