如何在android 11中检测指纹硬件答案

【问题标题】：How to detect fingerprint hardware in android 11如何在android 11中检测指纹硬件
【发布时间】：2021-05-22 07:48:01
【问题描述】：

如何检测手机是否有指纹硬件。我想要一个检测指纹硬件的代码。

我使用了这段代码，但是这段代码在“isHardwareDetected()”这个方法上显示错误。

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 
    }
}

【问题讨论】：

FingerprintManager 在 API 级别 28 中已弃用，请改用 BiometricPrompt 和 BiometricManager
或使用AndroidX Biometric Library

标签： android kotlin fingerprint android-fingerprint-api

【解决方案1】：

我对问题代码做了一些小改动，现在可以正常使用了。

但“FingerprintManagerCompat”类已被弃用

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            val manager = FingerprintManagerCompat.from(this)
            if (!manager.isHardwareDetected) {
                Log.e("tag","Fingerprint hardware not detected.")
            } else if (!manager.hasEnrolledFingerprints()) {
                Log.e("tag","No fingerprint is set")
            } else {
                Log.e("tag","Fingerprint is set")
            }
        }

【讨论】：

这很有用，但请提及已弃用类的替代方案。
很快我会用其他类更新这个答案

【解决方案2】：

我也试过了，效果很好

f (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        val fingerprintManager = FingerprintManagerCompat.from(this)
        if (!fingerprintManager .isHardwareDetected) {
            Log.e("tag","not detected.")
        } else if (!fingerprintManager .hasEnrolledFingerprints()) {
            Log.e("tag","No fingerprint is set")
        } else {
            Log.e("tag","Fingerprint is set")
        }
    }

【讨论】：

【解决方案3】：

在AndroidManifest.xml内添加如下代码：

<uses-feature android:name="android.hardware.fingerprint" android:required="true" />
<uses-permission android:name="android.permission.USE_FINGERPRINT" />

在需要检测硬件的地方使用它：

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            keyguardManager = (KeyguardManager) getSystemService(KEYGUARD_SERVICE);
            fingerprintManager = (FingerprintManager) getSystemService(FINGERPRINT_SERVICE);
    
            if (!fingerprintManager.isHardwareDetected()) {
                Toast.makeText(getApplicationContext(), "Your device doesn't support fingerprint authentication", Toast.LENGTH_SHORT).show();
            }
            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) {
                Toast.makeText(getApplicationContext(), "Please enable the fingerprint permission", Toast.LENGTH_SHORT).show();
    
        ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.USE_FINGERPRINT}, FingerprintHandler.FINGERPRINT_PERMISSION);
    
        }
    
        if (!fingerprintManager.hasEnrolledFingerprints()) {
            Toast.makeText(getApplicationContext(), "Your Device has no registered Fingerprints! Please register atleast one in your Device settings", Toast.LENGTH_LONG).show();
        }
}

【讨论】：