public class MainActivity extends FragmentActivity { FingerprintManager manager; KeyguardManager mKeyManager; private final static int REQUEST_CODE_CONFIRM_DEVICE_CREDENTIALS = 0; private final static String TAG = “finger_log”;@Override protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.activity_main);   //1:先獲取 指紋識別的的管理者 看看獲取方式 是不是感覺就和數學公式一樣  （xxx管理者）=this.getSystemService（Context.xxx服務）  manager = (FingerprintManager) this.getSystemService(Context.FINGERPRINT_SERVICE);   mKeyManager = (KeyguardManager) this.getSystemService(Context.KEYGUARD_SERVICE); // 2 初始化按鈕 設置監聽 // 監聽 監聽 聽什么 肯定是聽聽 這個手機有沒有 指紋識別這個功能 所以 看看isFinger()  Button btn_finger = (Button) findViewById(R.id.btn_activity_main_finger);   btn_finger.setOnClickListener(new View.OnClickListener() {     @Override     public void onClick(View v) {       if (isFinger()) {         Toast.makeText(MainActivity.this, "請進行指紋識別", Toast.LENGTH_LONG).show();         Log(TAG, "keyi");         startListening(null);       }     }   }); } public boolean isFinger() {   //android studio 上，沒有這個會報錯   if (ActivityCompat.checkSelfPermission(this, Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) {     Toast.makeText(this, "沒有指紋識別權限", Toast.LENGTH_SHORT).show();     return false;   }   Log(TAG, "有指紋權限");   //判斷硬件是否支持指紋識別   if (!manager.isHardwareDetected()) {     Toast.makeText(this, "沒有指紋識別模塊", Toast.LENGTH_SHORT).show();     return false;   }  Log(TAG, "有指紋模塊");   //判斷 是否開啟鎖屏密碼   if (!mKeyManager.isKeyguardSecure()) {     Toast.makeText(this, "沒有開啟鎖屏密碼", Toast.LENGTH_SHORT).show();     return false;   }   Log(TAG, "已開啟鎖屏密碼");   //判斷是否有指紋錄入   if (!manager.hasEnrolledFingerprints()) {     Toast.makeText(this, "沒有錄入指紋", Toast.LENGTH_SHORT).show();     return false;   }   Log(TAG, "已錄入指紋");   return true; } CancellationSignal mCancellationSignal = new CancellationSignal(); //回調方法 FingerprintManager.AuthenticationCallback mSelfCancelled = new FingerprintManager.AuthenticationCallback() {   @Override   public void onAuthenticationError(int errorCode, CharSequence errString) {     //但多次指紋密碼驗證錯誤后，進入此方法；并且，不能短時間內調用指紋驗證     Toast.makeText(MainActivity.this, errString, Toast.LENGTH_SHORT).show();     showAuthenticationScreen();   }   @Override   public void onAuthenticationHelp(int helpCode, CharSequence helpString) {     Toast.makeText(MainActivity.this, helpString, Toast.LENGTH_SHORT).show();   }   @Override   public void onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) {     Toast.makeText(MainActivity.this, "指紋識別成功", Toast.LENGTH_SHORT).show();   }   @Override   public void onAuthenticationFailed() {     Toast.makeText(MainActivity.this, "指紋識別失敗", Toast.LENGTH_SHORT).show();   } }; public void startListening(FingerprintManager.CryptoObject cryptoObject) {   //android studio 上，沒有這個會報錯   if (ActivityCompat.checkSelfPermission(this, Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) {     Toast.makeText(this, "沒有指紋識別權限", Toast.LENGTH_SHORT).show();     return;   }   manager.authenticate(cryptoObject, mCancellationSignal, 0, mSelfCancelled, null); } /**  * 鎖屏密碼  */ private void showAuthenticationScreen() {   Intent intent = mKeyManager.createConfirmDeviceCredentialIntent("finger", "測試指紋識別");   if (intent != null) {     startActivityForResult(intent, REQUEST_CODE_CONFIRM_DEVICE_CREDENTIALS);   } } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) {   if (requestCode == REQUEST_CODE_CONFIRM_DEVICE_CREDENTIALS) {     // Challenge completed, proceed with using cipher     if (resultCode == RESULT_OK) {       Toast.makeText(this, "識別成功", Toast.LENGTH_SHORT).show();     } else {       Toast.makeText(this, "識別失敗", Toast.LENGTH_SHORT).show();     }   } } private void Log(String tag, String msg) {   Log.d(tag, msg); } }

private static FingerprintController sSingleton = null;private Context mContext;private FingerprintManagerCompat manager;private static final String TAG = "FingerprintController";private static final String PREMISSION = "android.permission.USE_FINGERPRINT";//成功public static final int FINGER_SUCCESS = 0;//硬件不支持public static final int FINGER_ERROR_NO_HARDWARE = 1;//沒有申請權限public static final int FINGER_ERROR_NO_PERMISSION = 2;//用戶沒有賦予權限//Protection level: normal//指紋權限的級別是normal,理論上不需要動態權限認證public static final int FINGER_ERROR_NO_USER_PERMISSION = 3;//用戶沒有儲存指紋public static final int FINGER_ERROR_NO_FINGER = 4;//取消指紋識別private CancellationSignal cancellationSignal;private FingerAuthListener mAuthListener;public static synchronized FingerprintController getInstance(Context context) {  if (sSingleton == null) {    sSingleton = new FingerprintController(context);  }  return sSingleton;}public FingerprintController(Context context) {  mContext = context;  manager = FingerprintManagerCompat.from(this.mContext);}/** * 開始指紋識別 * 失敗次數過多后需要一定時間后才可以重新啟動 */public void startFingerAuth() {  if (null == cancellationSignal) {    cancellationSignal = new CancellationSignal();  }  manager.authenticate(null, 0, cancellationSignal, new FingerAuthCallBack(), null);}/** * 取消指紋識別 */public void cancelFingerAuth() {  if (cancellationSignal != null) {    cancellationSignal.cancel();    if (mAuthListener != null)      mAuthListener.cancel();  }}/** * 指紋識別回調 */public class FingerAuthCallBack extends FingerprintManagerCompat.AuthenticationCallback {  // 當出現錯誤的時候回調此函數，比如多次嘗試都失敗了的時候，errString是錯誤信息  @Override  public void onAuthenticationError(int errMsgId, CharSequence errString) {// Log.d(TAG, “onAuthenticationError: ” + errString); if (null != mAuthListener) mAuthListener.error(errString.toString()); }  // 當指紋驗證失敗的時候會回調此函數，失敗之后允許多次嘗試，失敗次數過多會停止響應一段時間然后再停止sensor的工作  @Override  public void onAuthenticationFailed() {    if (null != mAuthListener)      mAuthListener.failure();  }  @Override  public void onAuthenticationHelp(int helpMsgId, CharSequence helpString) {    if (null != mAuthListener)      Log.e("helpMsgId",helpMsgId+"");      Log.e("helpString",helpString.toString());      mAuthListener.help(helpString.toString());  }  // 當驗證的指紋成功時會回調此函數，然后不再監聽指紋sensor  @Override  public void onAuthenticationSucceeded(FingerprintManagerCompat.AuthenticationResult result) {   if (null != mAuthListener)      mAuthListener.success();  }}/** * 檢查指紋解鎖是否可用 * * @return 狀態 */public int checkFingerEnable() {  if (null == manager) {    manager = FingerprintManagerCompat.from(mContext);  }  if (!isAppPermissionEnable()) {    return FINGER_ERROR_NO_PERMISSION;  }  if (!manager.isHardwareDetected()) {    return FINGER_ERROR_NO_HARDWARE;  }  if (!manager.hasEnrolledFingerprints()) {    return FINGER_ERROR_NO_FINGER;  }  if (!isUserPermissionEnable()) {    return FINGER_ERROR_NO_USER_PERMISSION;  }  return FINGER_SUCCESS;}/** * 是否聲明了該權限 */private boolean isAppPermissionEnable() {  PackageManager pm = mContext.getPackageManager();  if (pm == null) {    Log.w(TAG, "can't get packagemanager");    return true;  }  try {    return PackageManager.PERMISSION_GRANTED == pm.checkPermission(PREMISSION, mContext.getPackageName());  } catch (Exception e) {    Log.w(TAG, "can't checkt Permission " + e.getMessage());    return true;  }}/** * 是否具有動態權限,理論上不需要驗證 */private boolean isUserPermissionEnable() {  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {    return PackageManager.PERMISSION_GRANTED == mContext.checkSelfPermission(Manifest.permission.USE_FINGERPRINT);  }  return true;}public void setAuthListener(FingerAuthListener authListener) {  mAuthListener = authListener;}public interface FingerAuthListener {  void success();  void error(String error);  void help(String msg);  void cancel();  void failure();}} 

private int code = FingerprintController.FINGER_SUCCESS;private TextView toast;@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); toast = (TextView) findViewById(R.id.toast); code = FingerprintController.getInstance(this).checkFingerEnable(); if (code == FingerprintController.FINGER_SUCCESS) {  FingerprintController.getInstance(this).setAuthListener(this);  setToast("可以啟動指紋識別"); } else {  switch (code) {   case FingerprintController.FINGER_ERROR_NO_HARDWARE:    setToast("該設備不支持指紋識別");    break;   case FingerprintController.FINGER_ERROR_NO_PERMISSION:    setToast("當前應用沒有指紋識別權限");    break;   case FingerprintController.FINGER_ERROR_NO_FINGER:    setToast("當前設備沒有錄入指紋,請前往錄入指紋");    break;  } }}public void start(View view) { if (code == FingerprintController.FINGER_SUCCESS) {  FingerprintController.getInstance(this).startFingerAuth();  setToast("開始指紋識別"); }}public void cancel(View view) { if (code == FingerprintController.FINGER_SUCCESS) {  FingerprintController.getInstance(this).cancelFingerAuth(); }}@Overridepublic void success() { setToast("識別成功");}@Overridepublic void error(String error) { setToast(error);}@Overridepublic void help(String msg) { setToast(msg);}@Overridepublic void cancel() { setToast("取消指紋識別");}@Overridepublic void failure() { setToast("指紋識別失敗");}public void setToast(String msg) { toast.setText("提示:" + msg);}