Android 指纹识别开发实例
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
Java代码
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：
源码如下：
FingerPrintEnrollBase：
Java代码
/*
* 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：
Java代码
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;
}
}
}
}
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