Android 调用系统指纹识别

￡神魔★判官ぃ 2022-09-16 11:08 307阅读 0赞

这是因为Android10系统才开放面部识别

所以你的手机就算有面部解锁功能，调用这个Biometric库还是会调出指纹解锁。

还有一些手机即使是Android10也无法调用面部解锁，可能与厂商是否开放面部解锁功能有关。

依赖  
dependencies \{  
implementation 'androidx.biometric:biometric:1.0.0-beta01'  
\}  
主要代码  
public class MainActivity extends AppCompatActivity \{  
private Handler handler = new Handler();

private Executor executor = new Executor() \{  
@Override  
public void execute(Runnable command) \{  
handler.post(command);  
\}  
\};  
@Override  
protected void onCreate(Bundle savedInstanceState) \{  
super.onCreate(savedInstanceState);  
setContentView(R.layout.activity\_main);  
Button biometricLoginButton = findViewById(R.id.biometric\_login);

BiometricManager biometricManager = BiometricManager.from(this);  
switch (biometricManager.canAuthenticate()) \{  
case BiometricManager.BIOMETRIC\_SUCCESS:  
Toast.makeText(this, "应用可以进行生物识别技术进行身份验证", Toast.LENGTH\_SHORT).show();

biometricLoginButton.setOnClickListener(view -> showBiometricPrompt());

break;  
case BiometricManager.BIOMETRIC\_ERROR\_NO\_HARDWARE:  
Toast.makeText(this, "该设备上没有搭载可用的生物特征功能", Toast.LENGTH\_SHORT).show();  
break;  
case BiometricManager.BIOMETRIC\_ERROR\_HW\_UNAVAILABLE:  
Toast.makeText(this, "生物识别功能当前不可用", Toast.LENGTH\_SHORT).show();  
break;  
case BiometricManager.BIOMETRIC\_ERROR\_NONE\_ENROLLED:  
Toast.makeText(this, "用户没有录入生物识别数据", Toast.LENGTH\_SHORT).show();  
break;  
\}

//生物认证的setting  
private void showBiometricPrompt() \{  
BiometricPrompt.PromptInfo promptInfo =  
new BiometricPrompt.PromptInfo.Builder()  
.setTitle("Biometric login for my app") //设置大标题  
.setSubtitle("Log in using your biometric credential") // 设置标题下的提示  
.setNegativeButtonText("Cancel") //设置取消按钮  
.build();

//需要提供的参数callback  
BiometricPrompt biometricPrompt = new BiometricPrompt(MainActivity.this,  
executor, new BiometricPrompt.AuthenticationCallback() \{  
//各种异常的回调  
@Override  
public void onAuthenticationError(int errorCode, @NonNull CharSequence errString) \{  
super.onAuthenticationError(errorCode, errString);  
Toast.makeText(getApplicationContext(),  
"Authentication error: " + errString, Toast.LENGTH\_SHORT)  
.show();  
\}

//认证成功的回调  
@Override  
public void onAuthenticationSucceeded(  
@NonNull BiometricPrompt.AuthenticationResult result) \{  
super.onAuthenticationSucceeded(result);  
BiometricPrompt.CryptoObject authenticatedCryptoObject =  
result.getCryptoObject();  
// User has verified the signature, cipher, or message  
// authentication code (MAC) associated with the crypto object,  
// so you can use it in your app's crypto-driven workflows.  
\}

//认证失败的回调  
@Override  
public void onAuthenticationFailed() \{  
super.onAuthenticationFailed();  
Toast.makeText(getApplicationContext(), "Authentication failed",  
Toast.LENGTH\_SHORT)  
.show();  
\}  
\});

// 显示认证对话框  
biometricPrompt.authenticate(promptInfo);  
\}  
\}