Android指纹解锁 Android指纹解锁方法解析

时间:2021-03-22 qq_31587497 人气:0

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我先说说这两种的方式的不同之处吧
第一种:
在调动成功之后不会让你指纹解锁而是调转到当初你设置指纹解锁时的手势解锁页面
第二种:
在调动成功之后，是进行指纹解锁不调转你直接把手指放到金属感应环上面进行指纹验证
大家可以根据需求自行选择

ok 那就亮代码了

第一种:
xml 布局: 一个文本显示一个按钮（不解释）

MainActivity.java源码

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); 
} 
}

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

第二种:
1：xml: 布局一个文本提示两个按钮（1: 开始识别 2:取消识别）
2: 咱们将业务操作放到一个FingerprintController 类里面

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;
//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();

}
}

3:在 main中实现 FingerprintController.FingerAuthListener这个回调接口

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();
 }
}


@Override
public void success() {
 setToast("识别成功");
}

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

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

@Override
public void cancel() {
 setToast("取消指纹识别");
}

@Override
public void failure() {
 setToast("指纹识别失败");
}

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

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