利用Android6.0怎么實(shí)現(xiàn)一個(gè)指紋識別功能

 public class FingerprintUtil{

 private FingerprintManagerCompat mFingerprintManager;
 private KeyguardManager mKeyManager;
 private CancellationSignal mCancellationSignal;
 private Activity mActivity;

 public FingerprintUtil(Context ctx) {
  mActivity = (Activity) ctx;
  mFingerprintManager = FingerprintManagerCompat.from(mActivity);
  mKeyManager = (KeyguardManager) mActivity.getSystemService(Context.KEYGUARD_SERVICE);

 }

 public void callFingerPrintVerify(final IFingerprintResultListener listener) {
  if (!isHardwareDetected()) {
   return;
  }
  if (!isHasEnrolledFingerprints()) {
   if (listener != null) {
    listener.onNoEnroll();
   }
   return;
  }
  if (!isKeyguardSecure()) {
   if (listener != null) {
    listener.onInSecurity();
   }
   return;
  }
  if (listener != null) {
   listener.onSupport();
  }

  if (listener != null) {
   listener.onAuthenticateStart();
  }
  if (mCancellationSignal == null) {
   mCancellationSignal = new CancellationSignal();
  }
  try {
   mFingerprintManager.authenticate(null, 0, mCancellationSignal, new FingerprintManagerCompat.AuthenticationCallback() {
    //多次嘗試都失敗會走onAuthenticationError，會停止響應(yīng)一段時(shí)間，提示嘗試次數(shù)過多，請稍后再試。
    @Override
    public void onAuthenticationError(int errMsgId, CharSequence errString) {
     if (listener != null)
      listener.onAuthenticateError(errMsgId, errString);
    }

    //指紋驗(yàn)證失敗走此方法，例如小米前4次驗(yàn)證失敗走onAuthenticationFailed,第5次走onAuthenticationError
    @Override
    public void onAuthenticationFailed() {
     if (listener != null)
      listener.onAuthenticateFailed();
    }

    @Override
    public void onAuthenticationHelp(int helpMsgId, CharSequence helpString) {
     if (listener != null)
      listener.onAuthenticateHelp(helpMsgId, helpString);

    }

    //當(dāng)驗(yàn)證的指紋成功時(shí)會回調(diào)此函數(shù)，然后不再監(jiān)聽指紋sensor
    @Override
    public void onAuthenticationSucceeded(FingerprintManagerCompat.AuthenticationResult result) {
     if (listener != null)
      listener.onAuthenticateSucceeded(result);
    }

   }, null);
  } catch (Exception e) {
   e.printStackTrace();
  }
 }

 /**
  * 是否錄入指紋，有些設(shè)備上即使錄入了指紋，但是沒有開啟鎖屏密碼的話此方法還是返回false
  *
  * @return
  */
 private boolean isHasEnrolledFingerprints() {
  try {
   return mFingerprintManager.hasEnrolledFingerprints();
  } catch (Exception e) {
   return false;
  }
 }

 /**
  * 是否有指紋識別硬件支持
  *
  * @return
  */
 public boolean isHardwareDetected() {
  try {
   return mFingerprintManager.isHardwareDetected();
  } catch (Exception e) {
   return false;
  }
 }

 /**
  * 判斷是否開啟鎖屏密碼
  *
  * @return
  */
 private boolean isKeyguardSecure() {
  try {
   return mKeyManager.isKeyguardSecure();
  } catch (Exception e) {
   return false;
  }

 }

 /**
  * 指紋識別回調(diào)接口
  */
 public interface IFingerprintResultListener {
  void onInSecurity();

  void onNoEnroll();

  void onSupport();

  void onAuthenticateStart();

  void onAuthenticateError(int errMsgId, CharSequence errString);

  void onAuthenticateFailed();

  void onAuthenticateHelp(int helpMsgId, CharSequence helpString);

  void onAuthenticateSucceeded(FingerprintManagerCompat.AuthenticationResult result);

 }

 public void cancelAuthenticate() {
  if (mCancellationSignal != null) {
   mCancellationSignal.cancel();
   mCancellationSignal = null;
  }
 }


 public void onDestroy() {
  cancelAuthenticate();
  mKeyManager = null;
  mFingerprintManager = null;

 }