如何检查android中指纹认证的设备兼容性

Question

我正在使用android 6.0 api进行指纹认证.我的要求是,如果当前设备支持指纹认证,那么我将通过指纹认证,否则将使用正常方式登录应用程序.

所以,任何人都可以告诉我,如何在android中检查设备兼容性以进行指纹认证.

提前致谢.

Answer 1

你必须isHardwareDetected在FingerprintManager课堂上使用方法.

确定指纹硬件是否存在且功能正常.如果硬件存在且功能正常则返回true,否则返回false.

// Check if we're running on Android 6.0 (M) or higher
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
    //Fingerprint API only available on from Android 6.0 (M)
    FingerprintManager fingerprintManager = (FingerprintManager) context.getSystemService(Context.FINGERPRINT_SERVICE);
    if (!fingerprintManager.isHardwareDetected()) { 
        // Device doesn't support fingerprint authentication     
    } else if (!fingerprintManager.hasEnrolledFingerprints()) { 
        // User hasn't enrolled any fingerprints to authenticate with 
    } else { 
        // Everything is ready for fingerprint authentication 
    }
}

不要忘记在AndroidManifest中添加访问指纹功能的权限.自API 28起:

<uses-permission android:name=" android.permission.USE_BIOMETRIC" />

在API28之前:

<uses-permission android:name="android.permission.USE_FINGERPRINT" />

使用支持库

如果您不想检查Build.VERSION,还可以使用支持库检查低于Android 6.0的设备

添加依赖:

compile "com.android.support:support-v4:23.0.0"

并使用FingerprintManagerCompat类如下:

FingerprintManagerCompat fingerprintManagerCompat = FingerprintManagerCompat.from(context);

if (!fingerprintManagerCompat.isHardwareDetected()) { 
    // Device doesn't support fingerprint authentication     
} else if (!fingerprintManagerCompat.hasEnrolledFingerprints()) { 
    // User hasn't enrolled any fingerprints to authenticate with 
} else { 
    // Everything is ready for fingerprint authentication 
}

Answer 2

只是跟进LaurentY的回答.您需要获得访问指纹扫描仪的权限.为此你需要将它添加到你的Manifest.

API 27及之前

<uses-permission android:name="android.permission.USE_FINGERPRINT" />

API 28及更高版本

<uses-permission android:name="android.permission.USE_BIOMETRIC" />