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(shí)別的的管理者 看看獲取方式 是不是感覺就和數(shù)學(xué)公式一樣
  （xxx管理者）=this.getSystemService（Context.xxx服務(wù)）
  manager = (FingerprintManager) this.getSystemService(Context.FINGERPRINT_SERVICE); 
  mKeyManager = (KeyguardManager) this.getSystemService(Context.KEYGUARD_SERVICE); 
// 2 初始化按鈕 設(shè)置監(jiān)聽 
// 監(jiān)聽 監(jiān)聽 聽什么 肯定是聽聽 這個(gè)手機(jī)有沒有 指紋識(shí)別這個(gè)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(qǐng)進(jìn)行指紋識(shí)別", Toast.LENGTH_LONG).show(); 
        Log(TAG, "keyi"); 
        startListening(null); 
      } 
    } 
  }); 

} 

public boolean isFinger() { 

  //android studio 上，沒有這個(gè)會(huì)報(bào)錯(cuò) 
  if (ActivityCompat.checkSelfPermission(this, Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) { 
    Toast.makeText(this, "沒有指紋識(shí)別權(quán)限", Toast.LENGTH_SHORT).show(); 
    return false; 
  } 
  Log(TAG, "有指紋權(quán)限"); 
  //判斷硬件是否支持指紋識(shí)別 
  if (!manager.isHardwareDetected()) { 
    Toast.makeText(this, "沒有指紋識(shí)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(diào)方法 
FingerprintManager.AuthenticationCallback mSelfCancelled = new FingerprintManager.AuthenticationCallback() { 
  @Override 
  public void onAuthenticationError(int errorCode, CharSequence errString) { 
    //但多次指紋密碼驗(yàn)證錯(cuò)誤后，進(jìn)入此方法；并且，不能短時(shí)間內(nèi)調(diào)用指紋驗(yàn)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(shí)別成功", Toast.LENGTH_SHORT).show(); 
  } 

  @Override 
  public void onAuthenticationFailed() { 
    Toast.makeText(MainActivity.this, "指紋識(shí)別失敗", Toast.LENGTH_SHORT).show(); 
  } 
}; 


public void startListening(FingerprintManager.CryptoObject cryptoObject) { 
  //android studio 上，沒有這個(gè)會(huì)報(bào)錯(cuò) 
  if (ActivityCompat.checkSelfPermission(this, Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) { 
    Toast.makeText(this, "沒有指紋識(shí)別權(quán)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(cè)試指紋識(shí)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(shí)別成功", Toast.LENGTH_SHORT).show(); 
    } else { 
      Toast.makeText(this, "識(shí)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(qǐng)權(quán)限
public static final int FINGER_ERROR_NO_PERMISSION = 2;
//用戶沒有賦予權(quán)限
//Protection level: normal
//指紋權(quán)限的級(jí)別是normal,理論上不需要?jiǎng)討B(tài)權(quán)限認(rèn)證
public static final int FINGER_ERROR_NO_USER_PERMISSION = 3;
//用戶沒有儲(chǔ)存指紋
public static final int FINGER_ERROR_NO_FINGER = 4;

//取消指紋識(shí)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(shí)別
 * 失敗次數(shù)過多后需要一定時(shí)間后才可以重新啟動(dòng)
 */
public void startFingerAuth() {
  if (null == cancellationSignal) {
    cancellationSignal = new CancellationSignal();
  }
  manager.authenticate(null, 0, cancellationSignal, new FingerAuthCallBack(), null);
}

/**
 * 取消指紋識(shí)別
 */
public void cancelFingerAuth() {
  if (cancellationSignal != null) {
    cancellationSignal.cancel();
    if (mAuthListener != null)
      mAuthListener.cancel();
  }
}

/**
 * 指紋識(shí)別回調(diào)
 */
public class FingerAuthCallBack extends FingerprintManagerCompat.AuthenticationCallback {

  // 當(dāng)出現(xiàn)錯(cuò)誤的時(shí)候回調(diào)此函數(shù)，比如多次嘗試都失敗了的時(shí)候，errString是錯(cuò)誤信息
  @Override
  public void onAuthenticationError(int errMsgId, CharSequence errString) {
// Log.d(TAG, “onAuthenticationError: ” + errString); 
if (null != mAuthListener) 
mAuthListener.error(errString.toString()); 
}

  // 當(dāng)指紋驗(yàn)證失敗的時(shí)候會(huì)回調(diào)此函數(shù)，失敗之后允許多次嘗試，失敗次數(shù)過多會(huì)停止響應(yīng)一段時(shí)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(dāng)驗(yàn)證的指紋成功時(shí)會(huì)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 (null != mAuthListener)
      mAuthListener.success();

  }

}

/**
 * 檢查指紋解鎖是否可用
 *
 * @return 狀態(tài)
 */
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(quán)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(dòng)態(tài)權(quán)限,理論上不需要驗(yàn)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;

@Override
protected 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(dòng)指紋識(shí)別");
 } else {
  switch (code) {
   case FingerprintController.FINGER_ERROR_NO_HARDWARE:
    setToast("該設(shè)備不支持指紋識(shí)別");
    break;
   case FingerprintController.FINGER_ERROR_NO_PERMISSION:
    setToast("當(dāng)前應(yīng)用沒有指紋識(shí)別權(quán)限");
    break;
   case FingerprintController.FINGER_ERROR_NO_FINGER:
    setToast("當(dāng)前設(shè)備沒有錄入指紋,請(qǐng)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(shí)別");
 }
}

public void cancel(View view) {
 if (code == FingerprintController.FINGER_SUCCESS) {
  FingerprintController.getInstance(this).cancelFingerAuth();
 }
}


@Override
public void success() {
 setToast("識(shí)別成功");
}

@Override
public void error(String error) {
 setToast(error);
}

@Override
public void help(String msg) {
 setToast(msg);
}

@Override
public void cancel() {
 setToast("取消指紋識(shí)別");
}

@Override
public void failure() {
 setToast("指紋識(shí)別失敗");
}

public void setToast(String msg) {
 toast.setText("提示:" + msg);
}