Android指紋解鎖方法解析

我先說說這兩種的方式的不同之處吧
第一種:
在調動成功之後 不會讓你指紋解鎖 而是調轉到當初你設置指紋解鎖時的 手勢解鎖頁面
第二種:
在調動成功之後，是進行指紋解鎖 不調轉 你直接把手指放到金屬感應環 上面進行指紋驗證
大家可以根據需求 自行選擇

ok 那就亮代碼了

第一種:
xml 布局: 一個 文本顯示 一個按鈕（不解釋）

MainActivity.java源碼

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 聽什麼 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後，進入此方法；並且，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); 
} 
}

===================================

第二種:
1：xml: 布局 一個文本提示 兩個按鈕（1: 開始識別 2:取消識別）
2: 咱們將業務操作放到一個FingerprintController 類裡面

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
 * 失敗次數過多後需要一定時間後才可以重新啟動
 */
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，失敗之後允許多次嘗試，失敗次數過多會停止響應一段時間然後再停止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，然後不再監聽指紋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();

}
} 

3:在 main中 實現 FingerprintController.FingerAuthListener這個 回調接口

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();
 }
}


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

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

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

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

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

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

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持本站。