阐述：前几天看到郭大神的博客讲到了指纹识别，学习后在此简单实现一下，想仔细了解的看：
https://blog.csdn.net/guolin_blog/article/details/81450114
第一步：首先看看验证识别页面
布局：
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorPrimary"
tools:context=".LoginActivity">
</FrameLayout>页面Activity
public class LoginActivity extends AppCompatActivity {
private static final String DEFAULT_KEY_NAME = "default_key";
KeyStore keyStore;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
if (supportFingerprint()) {
initKey();
initCipher();
}
}
public boolean supportFingerprint() {
if (Build.VERSION.SDK_INT < 23) {
Toast.makeText(this, "您的系统版本过低，不支持指纹功能", Toast.LENGTH_SHORT).show();
return false;
} else {
KeyguardManager keyguardManager = getSystemService(KeyguardManager.class);
FingerprintManager fingerprintManager = getSystemService(FingerprintManager.class);
if (!fingerprintManager.isHardwareDetected()) {
Toast.makeText(this, "您的手机不支持指纹功能", Toast.LENGTH_SHORT).show();
return false;
} else if (!keyguardManager.isKeyguardSecure()) {
Toast.makeText(this, "您还未设置锁屏，请先设置锁屏并添加一个指纹", Toast.LENGTH_SHORT).show();
return false;
} else if (!fingerprintManager.hasEnrolledFingerprints()) {
Toast.makeText(this, "您至少需要在系统设置中添加一个指纹", Toast.LENGTH_SHORT).show();
return false;
}
}
return true;
}
@TargetApi(23)
private void initKey() {
try {
keyStore = KeyStore.getInstance("AndroidKeyStore");
keyStore.load(null);
KeyGenerator keyGenerator = KeyGenerator.getInstance(KeyProperties.KEY_ALGORITHM_AES, "AndroidKeyStore");
KeyGenParameterSpec.Builder builder = new KeyGenParameterSpec.Builder(DEFAULT_KEY_NAME,
KeyProperties.PURPOSE_ENCRYPT |
KeyProperties.PURPOSE_DECRYPT)
.setBlockModes(KeyProperties.BLOCK_MODE_CBC)
.setUserAuthenticationRequired(true)
.setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_PKCS7);
keyGenerator.init(builder.build());
keyGenerator.generateKey();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
@TargetApi(23)
private void initCipher() {
try {
SecretKey key = (SecretKey) keyStore.getKey(DEFAULT_KEY_NAME, null);
Cipher cipher = Cipher.getInstance(KeyProperties.KEY_ALGORITHM_AES + "/"
+ KeyProperties.BLOCK_MODE_CBC + "/"
+ KeyProperties.ENCRYPTION_PADDING_PKCS7);
cipher.init(Cipher.ENCRYPT_MODE, key);
showFingerPrintDialog(cipher);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
private void showFingerPrintDialog(Cipher cipher) {
FingerprintDialogFragment fragment = new FingerprintDialogFragment();
fragment.setCipher(cipher);
fragment.show(getFragmentManager(), "fingerprint");
fragment.setCancelable(false);
}
public void onAuthenticated() {
Intent intent = new Intent(this, MainActivity.class);
startActivity(intent);
finish();
}
@Override
protected void onDestroy() {
super.onDestroy();
Log.i("+++++++++++++++++++", "onDestroy: 已销毁");
}
}第二步：接着来看看指纹弹出框页面
布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:src="@mipmap/ic_fp_40px"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="20dp"
android:text="请验证指纹解锁"
android:textColor="#000"
android:textSize="16sp"
/>
<TextView
android:id="@+id/error_msg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="5dp"
android:maxLines="1"
android:textSize="12sp"
android:textColor="#f45"
/>
<View
android:layout_width="match_parent"
android:layout_height="0.5dp"
android:layout_marginTop="10dp"
android:background="#ccc"
/>
<TextView
android:id="@+id/cancel"
android:layout_width="match_parent"
android:layout_height="50dp"
android:gravity="center"
android:text="取消"
android:textColor="#5d7883"
android:textSize="16sp"
/>
</LinearLayout>
注意，里面指纹识别的图片通常为了让用户清楚的知道现在需要进行指纹认证，Google官方建议最好使用一个通用的指纹图标，而不应该由各APP制作自己的指纹图标。为此，Google也特意提供了一套指纹认证的组图，可以点击这里查看和下载。
弹出框指纹识别页面
@TargetApi(23)
public class FingerprintDialogFragment extends DialogFragment {
private FingerprintManager fingerprintManager;
private CancellationSignal mCancellationSignal;
private Cipher mCipher;
private LoginActivity mActivity;
private TextView errorMsg;
/**
* 标识是否是用户主动取消的认证。
*/
private boolean isSelfCancelled;
public void setCipher(Cipher cipher) {
mCipher = cipher;
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
mActivity = (LoginActivity) getActivity();
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
fingerprintManager = getContext().getSystemService(FingerprintManager.class);
setStyle(DialogFragment.STYLE_NORMAL, android.R.style.Theme_Material_Light_Dialog);
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fingerprint_dialog, container, false);
errorMsg = v.findViewById(R.id.error_msg);
TextView cancel = v.findViewById(R.id.cancel);
//取消时，需要去哪个页面就看你的逻辑了
cancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dismiss();
stopListening();
startActivity(new Intent(getActivity(),HomeActivity.class));
getActivity().finish();
}
});
return v;
}
@Override
public void onResume() {
super.onResume();
// 开始指纹认证监听
startListening(mCipher);
}
@Override
public void onPause() {
super.onPause();
// 停止指纹认证监听
stopListening();
}
private void startListening(Cipher cipher) {
isSelfCancelled = false;
mCancellationSignal = new CancellationSignal();
fingerprintManager.authenticate(new FingerprintManager.CryptoObject(cipher), mCancellationSignal, 0, new FingerprintManager.AuthenticationCallback() {
@Override
public void onAuthenticationError(int errorCode, CharSequence errString) {
if (!isSelfCancelled) {
errorMsg.setText(errString);
if (errorCode == FingerprintManager.FINGERPRINT_ERROR_LOCKOUT) {
Toast.makeText(mActivity, errString, Toast.LENGTH_SHORT).show();
dismiss();
}
}
}
@Override
public void onAuthenticationHelp(int helpCode, CharSequence helpString) {
errorMsg.setText(helpString);
}
@Override
public void onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) {
Toast.makeText(mActivity, "指纹认证成功", Toast.LENGTH_SHORT).show();
mActivity.onAuthenticated();
}
@Override
public void onAuthenticationFailed() {
errorMsg.setText("指纹认证失败，请再试一次");
}
}, null);
}
private void stopListening() {
if (mCancellationSignal != null) {
mCancellationSignal.cancel();
mCancellationSignal = null;
isSelfCancelled = true;
}
}
}这就完成了，有什么不懂的，可以看看郭大神的博客，讲的很清楚，我只是在这总结一下实现过程。