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:
FingerprintManager
KeyguardManager
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();
}
}
