Android 指纹登录

public class MainActivity extends AppCompatActivity {

    @RequiresApi(api = Build.VERSION_CODES.M)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if (isFingerprintAuthAvailable()){
            fingerPrintCheck();
        }
    }

    /**
     * 判断是否具有指纹识别功能和是否已经设置指纹
     * */
    @SuppressLint("NewApi")
    public boolean isFingerprintAuthAvailable() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {//判断当前手机版本
            KeyguardManager mKeyguardManager = (KeyguardManager) getSystemService(Activity.KEYGUARD_SERVICE);//获得密码管理器
            if (!mKeyguardManager.isKeyguardSecure()) {//判断是否具有锁屏密码
                return false;
            }
            if (checkSelfPermission(Manifest.permission.USE_FINGERPRINT) == PackageManager.PERMISSION_GRANTED) {//判断APP是否具有指纹识别权限
                FingerprintManager manager = (FingerprintManager) getSystemService(Activity.FINGERPRINT_SERVICE); //获得指纹识别管理器对象
                CancellationSignal mCancellationSignal = new CancellationSignal();
                //判断是否具有指纹识别的硬件设施和是否已经录好指纹
                return manager.isHardwareDetected() && manager.hasEnrolledFingerprints();
            }else{
                return false;
            }
        }else{
            return false;
        }
    }

    /**
     * 开始指纹校验
     */
    @SuppressLint("NewApi")
    private void startFingerPrintListener() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (checkSelfPermission(Manifest.permission.USE_FINGERPRINT) == PackageManager.PERMISSION_GRANTED) {
                FingerprintManager manager = (FingerprintManager) getSystemService(Activity.FINGERPRINT_SERVICE);
                CancellationSignal mCancellationSignal = new CancellationSignal();
                //指纹检验
                manager.authenticate(null, mCancellationSignal, 0, new MyAuthenticationCallback(),null);
            }
        }
    }

    @RequiresApi(api = Build.VERSION_CODES.M)
    public class MyAuthenticationCallback extends FingerprintManager.AuthenticationCallback{
        private static final String TAG = "MainActivity";

        @Override
        public void onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) {
            super.onAuthenticationSucceeded(result);
            Log.e(TAG, "onAuthenticationSucceeded: " + "校验成功");
        }

        @Override
        public void onAuthenticationFailed() {
            super.onAuthenticationFailed();
            Log.e(TAG, "onAuthenticationFailed: " + "校验失败");
        }

        @Override
        public void onAuthenticationHelp(int helpCode, CharSequence helpString) {
            super.onAuthenticationHelp(helpCode, helpString);
            Log.e(TAG, "onAuthenticationHelp: " + helpString);
        }

        @Override
        public void onAuthenticationError(int errorCode, CharSequence errString) {
            super.onAuthenticationError(errorCode, errString);
            Log.e(TAG, "onAuthenticationError: " + errString);
        }
    }

    /**
     * 检验指纹功能
     */
    private void fingerPrintCheck() {
        // 判断是否具有指纹识别功能
        if (!isFingerprintAuthAvailable()) {
            return;
        }else{
            startFingerPrintListener();
        }
    }

}