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; } } } }

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