Android 简单指纹识别

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Android指纹识别需Android6.0以上，且硬件设备支持该功能。本例主要实现的是一个简单的指纹识别。在使用FingerPrintManager这个类实现的时候发现了很多问题，这个类里面的一些函数是不能调用的，也就是说当前的官方支持其实是有限的，我们能读取到本机已经存在的指纹，然后验证这些指纹。使用FingerPrintManager的时候会遇到要在应用中判断权限的问题，低版本的api无法识别。

主要代码：

package com.example.fingerprinttest;import android.Manifest;import android.app.KeyguardManager;import android.content.Context;import android.content.Intent;import android.content.pm.PackageManager;import android.hardware.fingerprint.FingerprintManager;import android.os.Bundle;import android.os.CancellationSignal;import android.support.v4.app.ActivityCompat;import android.support.v4.app.FragmentActivity;import android.view.View;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends FragmentActivity {      FingerprintManager manager;      KeyguardManager mKeyManager;      private final static int REQUEST_CODE_CONFIRM_DEVICE_CREDENTIALS = 0;      private final static String TAG = "finger_log";      TextView textView;      @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_main);          manager = (FingerprintManager) this.getSystemService(Context.FINGERPRINT_SERVICE);          mKeyManager = (KeyguardManager) this.getSystemService(Context.KEYGUARD_SERVICE);          textView = (TextView) findViewById(R.id.textView);        Button btn_finger = (Button) findViewById(R.id.btn_activity_main_finger);          btn_finger.setOnClickListener(new View.OnClickListener() {              @Override              public void onClick(View v) {                  if (isFinger()) {                      Toast.makeText(MainActivity.this, "请进行指纹识别", Toast.LENGTH_LONG).show();                      Log(TAG, "keyi");                      startListening(null);                  }              }          });        }        public boolean isFinger() {            //android studio 上，没有这个会报错          if (ActivityCompat.checkSelfPermission(this, Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) {              Toast.makeText(this, "没有指纹识别权限", Toast.LENGTH_SHORT).show();              return false;          }          Log(TAG, "有指纹权限");          //判断硬件是否支持指纹识别          if (!manager.isHardwareDetected()) {            Toast.makeText(this, "没有指纹识别模块", Toast.LENGTH_SHORT).show();              return false;          }       Log(TAG, "有指纹模块");          //判断 是否开启锁屏密码            if (!mKeyManager.isKeyguardSecure()) {              Toast.makeText(this, "没有开启锁屏密码", Toast.LENGTH_SHORT).show();              return false;          }          Log(TAG, "已开启锁屏密码");          //判断是否有指纹录入          if (!manager.hasEnrolledFingerprints()) {              Toast.makeText(this, "没有录入指纹", Toast.LENGTH_SHORT).show();              return false;          }         Log(TAG, "已录入指纹");            return true;      }        CancellationSignal mCancellationSignal = new CancellationSignal();      //回调方法      FingerprintManager.AuthenticationCallback mSelfCancelled = new FingerprintManager.AuthenticationCallback() {          @Override          public void onAuthenticationError(int errorCode, CharSequence errString) {              //但多次指纹密码验证错误后，进入此方法；并且，不能短时间内调用指纹验证              Toast.makeText(MainActivity.this, errString, Toast.LENGTH_SHORT).show();              showAuthenticationScreen();          }            @Override          public void onAuthenticationHelp(int helpCode, CharSequence helpString) {                Toast.makeText(MainActivity.this, helpString, Toast.LENGTH_SHORT).show();          }            @Override          public void onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) {                Toast.makeText(MainActivity.this, "指纹识别成功", Toast.LENGTH_SHORT).show();              textView.setText("指纹识别成功");        }            @Override          public void onAuthenticationFailed() {              Toast.makeText(MainActivity.this, "指纹识别失败", Toast.LENGTH_SHORT).show();             textView.setText("指纹识别失败");        }      };          public void startListening(FingerprintManager.CryptoObject cryptoObject) {          //android studio 上，没有这个会报错          if (ActivityCompat.checkSelfPermission(this, Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) {              Toast.makeText(this, "没有指纹识别权限", Toast.LENGTH_SHORT).show();              textView.setText("没有指纹识别权限");            return;          }          manager.authenticate(cryptoObject, mCancellationSignal, 0, mSelfCancelled, null);          }        /**       * 锁屏密码       */      private void showAuthenticationScreen() {            Intent intent = mKeyManager.createConfirmDeviceCredentialIntent("finger", "测试指纹识别");          if (intent != null) {              startActivityForResult(intent, REQUEST_CODE_CONFIRM_DEVICE_CREDENTIALS);          }      }        @Override      protected void onActivityResult(int requestCode, int resultCode, Intent data) {          if (requestCode == REQUEST_CODE_CONFIRM_DEVICE_CREDENTIALS) {              // Challenge completed, proceed with using cipher              if (resultCode == RESULT_OK) {                  Toast.makeText(this, "识别成功", Toast.LENGTH_SHORT).show();                 textView.setText("指纹识别成功");            } else {                  Toast.makeText(this, "识别失败", Toast.LENGTH_SHORT).show();                 textView.setText("指纹识别失败");            }          }      }        private void Log(String tag, String msg) {          android.util.Log.d(tag, msg);      }  }

例子较为简单，具体demo下载：http://download.csdn.net/detail/jingzhiying/9753338

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