Android 指纹解锁

util类：

public class FingerprintUtil {
    public static CancellationSignal cancellationSignal;

    public static  void callFingerPrint(Context context, final OnCallBackListener listener){
        FingerprintManagerCompat managerCompat = FingerprintManagerCompat.from(context.getApplicationContext());
        if (!managerCompat.isHardwareDetected()){ //判断设备是否支持
            if (listener != null)
                listener.onSupportFailed();
            return;
        }
        KeyguardManager keyguardManager =(KeyguardManager)context.getApplicationContext().getSystemService(Context.KEYGUARD_SERVICE);
        if (!keyguardManager.isKeyguardSecure()) {//判断设备是否处于安全保护中
            if (listener != null)
                listener.onInsecurity();
            return;
        }
        if (!managerCompat.hasEnrolledFingerprints()){ //判断设备是否已经注册过指纹
            if (listener != null)
                listener.onEnrollFailed(); //未注册
            return;
        }
        if (listener != null)
            listener.onAuthenticationStart(); //开始指纹识别
        cancellationSignal  = new CancellationSignal(); //必须重新实例化，否则cancel 过一次就不能再使用了
        managerCompat.authenticate(null,0,cancellationSignal,new 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，比如华为的提示就是：尝试次数过多，请稍后再试。
            @Override
            public void onAuthenticationError(int errMsgId, CharSequence errString) {
                if (listener != null)
                    listener.onAuthenticationError(errMsgId ,errString );
            }

            // 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 (listener != null)
                    listener.onAuthenticationFailed();
            }

            @Override
            public void onAuthenticationHelp(int helpMsgId, CharSequence helpString) {
                if (listener != null)
                    listener.onAuthenticationHelp(helpMsgId,helpString);
            }

            // 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 (listener != null)
                    listener.onAuthenticationSucceeded(result);
            }
            ;
        },null);

    }
    public interface  OnCallBackListener{
        void onSupportFailed();
        void onInsecurity();
        void onEnrollFailed();
        void onAuthenticationStart();
        void onAuthenticationError(int errMsgId, CharSequence errString);
        void onAuthenticationFailed();
        void onAuthenticationHelp(int helpMsgId, CharSequence helpString);
        void onAuthenticationSucceeded(FingerprintManagerCompat.AuthenticationResult result);
    }

    public static void cancel(){
        if (cancellationSignal != null)
            cancellationSignal.cancel();
    }
}

使用util类：

public void onFingerprintClick(){
        FingerprintUtil.callFingerPrint(getActivity(),new FingerprintUtil.OnCallBackListener() {
            AlertDialog dialog;
            @Override
            public void onSupportFailed() {
                showToast("当前设备不支持指纹或者Android版本低于6.0");
                showDialog();
            }

            @Override
            public void onInsecurity() {
                showToast("当前设备未处于安全保护中");
            }

            @Override
            public void onEnrollFailed() {
                showToast("请到设置中设置指纹");
            }

            @Override
            public void onAuthenticationStart() {
                AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
                View view = LayoutInflater.from(getActivity()).inflate(R.layout.layout_fingerprint,null);
                initView(view);
                builder.setView(view);
                builder.setCancelable(false);
                dialog = builder.create();
                dialog.show();
                final TextView tvPwd = (TextView) view.findViewById(R.id.tvPwd);
                tvPwd.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        handler.removeMessages(0);
                        FingerprintUtil.cancel();
                        showDialog();
                    }
                });
                final TextView tvCancel = (TextView) view.findViewById(R.id.tvCancel);
                tvCancel.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        handler.removeMessages(0);
                        FingerprintUtil.cancel();
                    }
                });
            }

            @Override
            public void onAuthenticationError(int errMsgId, CharSequence errString) {
                showToast(errString.toString());
                if (dialog != null  &&dialog.isShowing()){
                    dialog.dismiss();
                    handler.removeMessages(0);
                }
            }

            @Override
            public void onAuthenticationFailed() {
                showToast("解锁失败");
            }

            @Override
            public void onAuthenticationHelp(int helpMsgId, CharSequence helpString) {
                showToast(helpString.toString());
            }

            @Override
            public void onAuthenticationSucceeded(FingerprintManagerCompat.AuthenticationResult result) {
                showToast("解锁成功");
                if (dialog != null  &&dialog.isShowing()){
                    dialog.dismiss();
                    handler.removeMessages(0);
                }
                if (isSafety){
                    code = 0;
                }else {
                    code = 1;
                }
                setSafetyInfo(code);
            }
        });
    }