Android6.0指纹识别开发案例

Android M指纹的资料太少，经过一段时间阅读原生Android代码，写了以下例子，贡献出来给需要帮助的人。
以下内容基于64位的高通CPU，搭载fpc1020芯片，此部分代码在原生android上做了更改，以应付工厂指纹的测试。原生android指纹录入需要采集10次（因不同的芯片而定）。

代码简单说明：

1. FingerPrintEnrollBase类：
重要的是

public interface Listener {
  void onEnrollmentHelp(CharSequence helpString);
  void onEnrollmentError(int errMsgId, CharSequence errString);
  void onEnrollmentProgressChange(int steps, int remaining);
}

这个接口。
　　1)onEnrollmentHelp函数:是下层返回的指纹操作帮助信息。
　　2）onEnrollmentError函数是下层返回的错误信息，errMsgId是错误信息类型，其中1表示指纹硬件不可用，3表示超时，5表示操作已取消。errString是errMsgId对应的文字信息，有需要的自己实验就知道了。
　　3）onEnrollmentProgressChange（）函数是显示当前指纹的采集情况，steps：总共需要录入多少次；remaining是剩余多少次，我在此函数中有打印Log。

2. FingerPrintActivity是主Activity类，FingerPrintEnrollBase是指纹Base类。
需要特别说明的是，在FingerPrintEnrollBase类中有一句：private byte[] mToken = new byte[69];这个数组正常情况是通过输入密码后经由framework层向hal层申请的，我这里为了省去验证那一块的代码，通过sizeof(hw_auth_token_t)计算出来的为69，需要的请依此计算。我在代码里实验过，此数组如果不是69（在64位CPU上），将直接导致程序crach!
fpc指纹的采集流程图：

/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License
 */ 

package com.mediatek.test; 

import android.app.Activity;
import android.app.Fragment;
import android.content.Context;
import android.hardware.fingerprint.FingerprintManager;
import android.os.Bundle;
import android.os.CancellationSignal;
import android.os.Handler;
import android.util.Log;
/**
 * local fragment to handle the state around fingerprint enrollment.
 */
public class FingerPrintEnrollBase extends Fragment { 

 private int mEnrollmentSteps = -1;
 private int mEnrollmentRemaining = 0;
 private Listener mListener;
 private boolean mEnrolling;
 private CancellationSignal mEnrollmentCancel;
 private Handler mHandler = new Handler();
 private byte[] mToken = new byte[69];//if byte length != sizeof(hw_auth_token_t), throws Exception
 private boolean mDone;
 private static final String TAG = "FingerPrintEnrollBase"; 

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setRetainInstance(true);
 } 

 @Override
 public void onAttach(Activity activity) {
  super.onAttach(activity);
 } 

 @Override
 public void onStart() {
  super.onStart();
  Log.d(TAG, "mToken length="+mToken.length);
  if (!mEnrolling) {
   FingerprintManager mFpM = (FingerprintManager) getActivity().getSystemService(Context.FINGERPRINT_SERVICE);
   startEnrollment(mFpM);
  }
 } 

 @Override
 public void onStop() {
  super.onStop();
  if (!getActivity().isChangingConfigurations()) {
   cancelEnrollment();
  }
 } 

 protected void startEnrollment(FingerprintManager mFpM) {
  mHandler.removeCallbacks(mTimeoutRunnable);
  mEnrollmentSteps = -1;
  mEnrollmentCancel = new CancellationSignal();
  if(mFpM != null){
   mFpM.enroll(mToken, mEnrollmentCancel, 0, mEnrollmentCallback);
  }
  mEnrolling = true;
 } 

 protected void cancelEnrollment() {
  mHandler.removeCallbacks(mTimeoutRunnable);
  if (mEnrolling) {
   mEnrollmentCancel.cancel();
   mEnrolling = false;
   mEnrollmentSteps = -1;
  }
 } 

 public void setListener(Listener listener) {
  mListener = listener;
 } 

 public int getEnrollmentSteps() {
  return mEnrollmentSteps;
 } 

 public int getEnrollmentRemaining() {
  return mEnrollmentRemaining;
 } 

 public boolean isDone() {
  return mDone;
 } 

 private FingerprintManager.EnrollmentCallback mEnrollmentCallback
   = new FingerprintManager.EnrollmentCallback() { 

  @Override
  public void onEnrollmentProgress(int remaining) {
   if (mEnrollmentSteps == -1) {
    mEnrollmentSteps = remaining;
   }
   mEnrollmentRemaining = remaining;
   mDone = remaining == 0;
   if (mListener != null) {
    mListener.onEnrollmentProgressChange(mEnrollmentSteps, remaining);
   }
  } 

  @Override
  public void onEnrollmentHelp(int helpMsgId, CharSequence helpString) {
   if (mListener != null) {
    mListener.onEnrollmentHelp(helpString);
   }
  } 

  @Override
  public void onEnrollmentError(int errMsgId, CharSequence errString) {
   if (mListener != null) {
    mListener.onEnrollmentError(errMsgId, errString);
   }
  }
 }; 

 private final Runnable mTimeoutRunnable = new Runnable() {
  @Override
  public void run() {
   cancelEnrollment();
  }
 }; 

 public interface Listener {
  void onEnrollmentHelp(CharSequence helpString);
  void onEnrollmentError(int errMsgId, CharSequence errString);
  void onEnrollmentProgressChange(int steps, int remaining);
 }
} 

FingerPrintActivity：

package com.mediatek.test; 

import java.io.FileInputStream;
import java.io.IOException;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask; 

import android.R.color;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.os.CancellationSignal;
import android.os.Handler;
import android.os.Message;
import android.text.Spannable;
import android.text.style.ForegroundColorSpan;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TableRow;
import android.widget.TextView;
import android.widget.Toast; 

import com.mediatek.test.R;
import android.hardware.fingerprint.Fingerprint;
import android.hardware.fingerprint.FingerprintManager; 

public class FingerPrintActivity extends Activity implements FingerPrintEnrollBase.Listener{
 private static final String TAG = "FingerPrintActivity";
 private MyHandler mHandler = new MyHandler();
 private TextView fingerPrintAcquisitionTextView, fingerPrintEnrollmentErrorView, fingerPrintEnrollmentHelpView;
 private FingerPrintEnrollBase fpeb;
 private FingerprintManager mFingerprintManager; 

 @Override
 protected int setTitleId() {
  return R.string.tittle_fingerprint;
 } 

 @Override
 protected Activity getActivity() {
  return this;
 } 

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.fingerprint);
  fingerPrintAcquisitionTextView = (TextView)findViewById(R.id.fingerprint_message);
  fingerPrintEnrollmentErrorView= (TextView)findViewById(R.id.fingerprint_enrollment_error);
  fingerPrintEnrollmentHelpView= (TextView)findViewById(R.id.fingerprint_enrollment_help); 

  mFingerprintManager = (FingerprintManager) getActivity().getSystemService(
    Context.FINGERPRINT_SERVICE); 

 } 

 private void sendMsgToHandler(int msgType, String remark){
  Message msg = Message.obtain();
  msg.what = msgType;
  Bundle bundle = new Bundle();
  bundle.putString("result", remark);
  msg.setData(bundle);
  mHandler.sendMessage(msg);
 } 

 @Override
 public void onEnrollmentHelp(CharSequence helpString) {
  Log.d(TAG, "==onEnrollmentHelp="+helpString.toString());
  sendMsgToHandler(3, helpString.toString());
 } 

 @Override
 public void onEnrollmentError(int errMsgId, CharSequence errString) {
  Log.d(TAG, "==onEnrollmentError errMsgId="+errMsgId+" errString="+errString.toString());
  if(errMsgId == 3){//time out
   postEnrollment();
  }else if(errMsgId == 1){//hardware lose efficacy
   startEnrollment();
  }else if(errMsgId == 5){//operation cancel
  }else{
   sendMsgToHandler(4, errString.toString());
  }
 } 

 @Override
 public void onEnrollmentProgressChange(int steps, int remaining) {
  Log.d(TAG, "===============onEnrollmentProgressChange=======");
  Log.d(TAG, "steps" + steps + "||remaining=" + remaining);
  fingerPrintEnrollmentHelpView.setText("");
  fingerPrintEnrollmentErrorView.setText("");
  sendMsgToHandler(2, getString(R.string.fingerprint_validate_success));
  buttonS.setEnabled(true);
  stopFingerprint();
 } 

 private void startEnrollment(){
  if (fpeb == null) {
   fpeb = new FingerPrintEnrollBase();
  }
  fpeb.setListener(this);
  fpeb.startEnrollment(mFingerprintManager);
 }
 private void postEnrollment(){
  if(mFingerprintManager != null){
   mFingerprintManager.postEnroll();
  }
 } 

 private void stopFingerprint() {
  if (fpeb != null){
   fpeb.cancelEnrollment();
   onStop();
  }
 } 

 @Override
 protected void onStart() {
  super.onStart();
 } 

 @Override
 protected void onStop() {
  super.onStop();
  if(fpeb != null){
   fpeb.setListener(null);
  }
 } 

 @Override
 protected void onResume() {
  super.onResume();
  if(mFingerprintManager == null){
   mFingerprintManager = (FingerprintManager) getActivity().getSystemService(
    Context.FINGERPRINT_SERVICE);
  } 

  startEnrollment();
 } 

 @Override
 protected void onPause() {
  super.onPause();
  postEnrollment();
  mFingerprintManager = null;
  stopFingerprint();
  fpeb = null;
 } 

 class MyHandler extends Handler{ 

  @Override
  public void handleMessage(Message msg) {
   Bundle bundle = null;
   super.handleMessage(msg);
   switch (msg.what) {
   case 0:
    removeMessages(0);
    bundle = msg.getData();
    String result = bundle.getString("result");
    selfTestView.setText(result);
    selfTestView.setTextColor(result.contains("PASS")?Color.GREEN:Color.RED);
    break;
   case 1:
    removeMessages(1);
    bundle = msg.getData();
    String rs = bundle.getString("result");
    checkBroadView.setText(bundle.getString("result"));
    checkBroadView.setTextColor(rs.contains("PASS")?Color.GREEN:Color.RED);
    break;
   case 2:
    removeMessages(2);
    bundle = msg.getData();
    String fingerprint = bundle.getString("result");
    fingerPrintAcquisitionTextView.setText(bundle.getString("result"));
    fingerPrintAcquisitionTextView.setTextColor(fingerprint.contains("PASS")?Color.GREEN:Color.WHITE);
    mButtonSelftest.setEnabled(true);
    mButtonCheckerboardTest.setEnabled(true);
    break;
   case 3:
    removeMessages(3);
    bundle = msg.getData();
    String enrollmentHelp = bundle.getString("result");
    fingerPrintEnrollmentHelpView.setText(bundle.getString("result"));
    break;
   case 4:
    removeMessages(4);
    bundle = msg.getData();
    String enrollmentError = bundle.getString("result");
    fingerPrintEnrollmentErrorView.setText(bundle.getString("result"));
    fingerPrintAcquisitionTextView.setText("");
    break;
   default:
    break;
   }
  }
 } 

}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。