Android(安卓)指纹登录工具类封装

核心

Android 指纹是在 6.0 才出来的一个重要的功能

@RequiresApi(api = Build.VERSION_CODES.M)

核心的两个 api:

FingerprintManagerKeyguardManager

step1

判断android 版本，如果小于 6.0 支持不了指纹

if(Build.VERSION.SDK_INT < Build.VERSION_CODES.M){return;}

step2

判断手机硬件（有没有指纹感应区）就是手机是否支持传感

  @RequiresApi(api = Build.VERSION_CODES.M)    public boolean isHardFinger() {        if (fingerprintManager != null && fingerprintManager.isHardwareDetected()) {            return true;        } else {            return false;        }    }

step3

检查手机是否开启锁屏密码（如手机未开锁，涉及到一个优先级问题，先解锁后使用）

  public boolean isWindowSafe() {        if (keyguardManager != null && keyguardManager.isKeyguardSecure()) {            return true;        } else {            return false;        }    }

step4

检查手机是否有录入指纹

  @RequiresApi(api = Build.VERSION_CODES.M)    public boolean isHaveHandler() {        if (fingerprintManager != null && fingerprintManager.hasEnrolledFingerprints()) {            return true;        } else {            return false;        }    }

只有以上步骤全满足，才能使用指纹

开启指纹验证

    @RequiresApi(api = Build.VERSION_CODES.M)    public void authenticate(FingerprintManager.CryptoObject cryptoObject, CancellationSignal cancellationSignal,                             int flag,                             FingerprintManager.AuthenticationCallback authenticationCallback, Handler handler) {        if (fingerprintManager != null) {            fingerprintManager.authenticate(cryptoObject, cancellationSignal, flag, authenticationCallback, handler);        }    }参数中最重要的就是 cancellationSignal和 callback，其他传null 和 0 就行，cancellationsignal  是用来取消指纹验证的，而callback 可以回调 指纹验证失败次数 或者指纹验证成功、

最后附上简单工具类

/** * 指纹识别工具类 */public class FingerUtils {    private final FingerprintManager fingerprintManager;    private final KeyguardManager keyguardManager;    @RequiresApi(api = Build.VERSION_CODES.M)    private FingerUtils(Context context) {        fingerprintManager = (FingerprintManager) context.getSystemService(Context.FINGERPRINT_SERVICE);        keyguardManager = (KeyguardManager) context.getSystemService(Context.KEYGUARD_SERVICE);    }    private static FingerUtils singleton = null;    @RequiresApi(api = Build.VERSION_CODES.M)    public static FingerUtils getInstance(Context context) {        if (singleton == null) {            synchronized (FingerUtils.class) {                if (singleton == null) {                    singleton = new FingerUtils(context);                }            }        }        return singleton;    }    /**     * ②检查手机硬件（有没有指纹感应区）     */    @RequiresApi(api = Build.VERSION_CODES.M)    public boolean isHardFinger() {        if (fingerprintManager != null && fingerprintManager.isHardwareDetected()) {            return true;        } else {            return false;        }    }    /**     * ③检查手机是否开启锁屏密码     */    public boolean isWindowSafe() {        if (keyguardManager != null && keyguardManager.isKeyguardSecure()) {            return true;        } else {            return false;        }    }    /**     * ④检查手机是否已录入指纹     */    @RequiresApi(api = Build.VERSION_CODES.M)    public boolean isHaveHandler() {        if (fingerprintManager != null && fingerprintManager.hasEnrolledFingerprints()) {            return true;        } else {            return false;        }    }    /**     * 创建指纹验证     */    @RequiresApi(api = Build.VERSION_CODES.M)    public void authenticate(FingerprintManager.CryptoObject cryptoObject, CancellationSignal cancellationSignal,                             int flag,                             FingerprintManager.AuthenticationCallback authenticationCallback, Handler handler) {        if (fingerprintManager != null) {            fingerprintManager.authenticate(cryptoObject, cancellationSignal, flag, authenticationCallback, handler);        }    }    /**     * 取消指纹验证  . 应该不会用上     */    public void cannelFinger(CancellationSignal cancellationSignal) {        cancellationSignal.cancel();    }}

核心

step1

step2

step3

step4

只有以上步骤全满足，才能使用指纹

开启指纹验证

最后附上简单工具类

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