Android指纹解锁方法解析

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:先获取 指纹识别的的管理者 看看获取方式 是不是感觉就和数学公式一样  （xxx管理者）=this.getSystemService（Context.xxx服务）  manager = (FingerprintManager) this.getSystemService(Context.FINGERPRINT_SERVICE);   mKeyManager = (KeyguardManager) this.getSystemService(Context.KEYGUARD_SERVICE); // 2 初始化按钮 设置监听 // 监听 监听 听什么 肯定是听听 这个手机有没有 指纹识别这个功能 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, "请进行指纹识别", Toast.LENGTH_LONG).show();         Log(TAG, "keyi");         startListening(null);       }     }   }); } public boolean isFinger() {   //android studio 上，没有这个会报错   if (ActivityCompat.checkSelfPermission(this, Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) {     Toast.makeText(this, "没有指纹识别权限", Toast.LENGTH_SHORT).show();     return false;   }   Log(TAG, "有指纹权限");   //判断硬件是否支持指纹识别   if (!manager.isHardwareDetected()) {     Toast.makeText(this, "没有指纹识别模块", Toast.LENGTH_SHORT).show();     return false;   }  Log(TAG, "有指纹模块");   //判断 是否开启锁屏密码   if (!mKeyManager.isKeyguardSecure()) {     Toast.makeText(this, "没有开启锁屏密码", Toast.LENGTH_SHORT).show();     return false;   }   Log(TAG, "已开启锁屏密码");   //判断是否有指纹录入   if (!manager.hasEnrolledFingerprints()) {     Toast.makeText(this, "没有录入指纹", Toast.LENGTH_SHORT).show();     return false;   }   Log(TAG, "已录入指纹");   return true; } CancellationSignal mCancellationSignal = new CancellationSignal(); //回调方法 FingerprintManager.AuthenticationCallback mSelfCancelled = new FingerprintManager.AuthenticationCallback() {   @Override   public void onAuthenticationError(int errorCode, CharSequence errString) {     //但多次指纹密码验证错误后，进入此方法；并且，不能短时间内调用指纹验证     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, "指纹识别成功", Toast.LENGTH_SHORT).show();   }   @Override   public void onAuthenticationFailed() {     Toast.makeText(MainActivity.this, "指纹识别失败", Toast.LENGTH_SHORT).show();   } }; public void startListening(FingerprintManager.CryptoObject cryptoObject) {   //android studio 上，没有这个会报错   if (ActivityCompat.checkSelfPermission(this, Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) {     Toast.makeText(this, "没有指纹识别权限", Toast.LENGTH_SHORT).show();     return;   }   manager.authenticate(cryptoObject, mCancellationSignal, 0, mSelfCancelled, null); } /**  * 锁屏密码  */ private void showAuthenticationScreen() {   Intent intent = mKeyManager.createConfirmDeviceCredentialIntent("finger", "测试指纹识别");   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, "识别成功", Toast.LENGTH_SHORT).show();     } else {       Toast.makeText(this, "识别失败", 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;//没有申请权限public static final int FINGER_ERROR_NO_PERMISSION = 2;//用户没有赋予权限//Protection level: normal//指纹权限的级别是normal,理论上不需要动态权限认证public static final int FINGER_ERROR_NO_USER_PERMISSION = 3;//用户没有储存指纹public static final int FINGER_ERROR_NO_FINGER = 4;//取消指纹识别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);}/** * 开始指纹识别 * 失败次数过多后需要一定时间后才可以重新启动 */public void startFingerAuth() {  if (null == cancellationSignal) {    cancellationSignal = new CancellationSignal();  }  manager.authenticate(null, 0, cancellationSignal, new FingerAuthCallBack(), null);}/** * 取消指纹识别 */public void cancelFingerAuth() {  if (cancellationSignal != null) {    cancellationSignal.cancel();    if (mAuthListener != null)      mAuthListener.cancel();  }}/** * 指纹识别回调 */public class FingerAuthCallBack extends FingerprintManagerCompat.AuthenticationCallback {  // 当出现错误的时候回调此函数，比如多次尝试都失败了的时候，errString是错误信息  @Override  public void onAuthenticationError(int errMsgId, CharSequence errString) {// Log.d(TAG, “onAuthenticationError: ” + errString); if (null != mAuthListener) mAuthListener.error(errString.toString()); }  // 当指纹验证失败的时候会回调此函数，失败之后允许多次尝试，失败次数过多会停止响应一段时间然后再停止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());  }  // 当验证的指纹成功时会回调此函数，然后不再监听指纹sensor  @Override  public void onAuthenticationSucceeded(FingerprintManagerCompat.AuthenticationResult result) {   if (null != mAuthListener)      mAuthListener.success();  }}/** * 检查指纹解锁是否可用 * * @return 状态 */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;}/** * 是否声明了该权限 */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;  }}/** * 是否具有动态权限,理论上不需要验证 */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("可以启动指纹识别"); } else {  switch (code) {   case FingerprintController.FINGER_ERROR_NO_HARDWARE:    setToast("该设备不支持指纹识别");    break;   case FingerprintController.FINGER_ERROR_NO_PERMISSION:    setToast("当前应用没有指纹识别权限");    break;   case FingerprintController.FINGER_ERROR_NO_FINGER:    setToast("当前设备没有录入指纹,请前往录入指纹");    break;  } }}public void start(View view) { if (code == FingerprintController.FINGER_SUCCESS) {  FingerprintController.getInstance(this).startFingerAuth();  setToast("开始指纹识别"); }}public void cancel(View view) { if (code == FingerprintController.FINGER_SUCCESS) {  FingerprintController.getInstance(this).cancelFingerAuth(); }}@Overridepublic void success() { setToast("识别成功");}@Overridepublic void error(String error) { setToast(error);}@Overridepublic void help(String msg) { setToast(msg);}@Overridepublic void cancel() { setToast("取消指纹识别");}@Overridepublic void failure() { setToast("指纹识别失败");}public void setToast(String msg) { toast.setText("提示:" + msg);}