Android6.0指纹识别开发案例

2019-12-12 05:22:35

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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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