public class MainActivity extends AppCompatActivity implements View.OnClickListener {
 private static final String TAG = "MainActivity";
 private Button check;
 private FingerprintManagerCompat manager;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);

 check = (Button) findViewById(R.id.btn_check);

 check.setOnClickListener(this);

 // 獲取一個FingerPrintManagerCompat的實例
 manager = FingerprintManagerCompat.from(this);
 }

 @Override
 public void onClick(View v) {
 switch (v.getId()) {
 case R.id.btn_check:
 /**
  * 開始驗證，什么時候停止由系統(tǒng)來確定，如果驗證成功，那么系統(tǒng)會關系sensor，如果失敗，則允許
  * 多次嘗試，如果依舊失敗，則會拒絕一段時間，然后關閉sensor，過一段時候之后再重新允許嘗試
  * 
  * 第四個參數為重點，需要傳入一個FingerprintManagerCompat.AuthenticationCallback的子類
  * 并重寫一些方法，不同的情況回調不同的函數
  */
 manager.authenticate(null, 0, null, new MyCallBack(), null);
 break;
 }
 }

 public class MyCallBack extends FingerprintManagerCompat.AuthenticationCallback {
 private static final String TAG = "MyCallBack";

 // 當出現錯誤的時候回調此函數，比如多次嘗試都失敗了的時候，errString是錯誤信息
 @Override
 public void onAuthenticationError(int errMsgId, CharSequence errString) {
 Log.d(TAG, "onAuthenticationError: " + errString);
 }

 // 當指紋驗證失敗的時候會回調此函數，失敗之后允許多次嘗試，失敗次數過多會停止響應一段時間然后再停止sensor的工作
 @Override
 public void onAuthenticationFailed() {
 Log.d(TAG, "onAuthenticationFailed: " + "驗證失敗");
 }

 @Override
 public void onAuthenticationHelp(int helpMsgId, CharSequence helpString) {
 Log.d(TAG, "onAuthenticationHelp: " + helpString);
 }

 // 當驗證的指紋成功時會回調此函數，然后不再監(jiān)聽指紋sensor
 @Override
 public void onAuthenticationSucceeded(FingerprintManagerCompat.AuthenticationResult
    result) {
 Log.d(TAG, "onAuthenticationSucceeded: " + "驗證成功");
 }
 }

} 

private Handler handler = new Handler() {
 @Override
 public void handleMessage(Message msg) {
 super.handleMessage(msg);
 Log.d(TAG, "handleMessage: 重啟指紋模塊");
 manager.authenticate(null, 0, null, new MyCallBack(), handler);
 }
}; 

@Override
public void onAuthenticationError(int errMsgId, CharSequence errString) {
 handler.sendMessageDelayed(new Message(), 1000 * 30);
 Log.d(TAG, "onAuthenticationError: " + errString);
}

@Override
public void onAuthenticationSucceeded(FingerprintManagerCompat.AuthenticationResult result) {
 handler.sendMessageDelayed(new Message(), 1000 * 30);
 Log.d(TAG, "onAuthenticationSucceeded: " + "驗證成功");
}