核心

Android 指紋 是在 6.0 才出來的一個(gè)重要的功能

@RequiresApi(api = Build.VERSION_CODES.M)

核心的兩個(gè) api:

FingerprintManager
KeyguardManager

step1

判斷android 版本葵陵，如果小于 6.0 支持不了指紋

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

step2

判斷 手機(jī)硬件（有沒有指紋感應(yīng)區(qū)）就是手機(jī)是否支持傳感

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

step3

檢查手機(jī)是否開啟鎖屏密碼（如手機(jī)未開鎖侄旬，涉及到一個(gè)優(yōu)先級問題雕沿，先解鎖 后使用）

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

step4

檢查手機(jī)是否有錄入指紋

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

只有以上步驟全滿足勺美，才能使用指紋

開啟指紋驗(yàn)證

    @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);
        }
    }

參數(shù)中最重要的就是 cancellationSignal和 callback伍派，其他傳null 和 0 就行切厘，
cancellationsignal  是用來取消指紋驗(yàn)證的拦宣，而callback 可以回調(diào) 指紋驗(yàn)證失敗次數(shù) 或者指紋驗(yàn)證成功溢十、

最后附上簡單工具類

/**
 * 指紋識(shí)別工具類
 */
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檢查手機(jī)硬件（有沒有指紋感應(yīng)區(qū)）
     */

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

    /**
     * ③檢查手機(jī)是否開啟鎖屏密碼
     */

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

    /**
     * ④檢查手機(jī)是否已錄入指紋
     */
    @RequiresApi(api = Build.VERSION_CODES.M)
    public boolean isHaveHandler() {
        if (fingerprintManager != null && fingerprintManager.hasEnrolledFingerprints()) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * 創(chuàng)建指紋驗(yàn)證
     */
    @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);
        }
    }

    /**
     * 取消指紋驗(yàn)證  . 應(yīng)該不會(huì)用上
     */
    public void cannelFinger(CancellationSignal cancellationSignal) {
        cancellationSignal.cancel();

    }
}

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