笔者公司有做收集指纹的业务，用的是设备中心提供的一些so库和jar包，因为有很多地方有用到，为了不导致复制粘贴，就封装了一下代码，也想借此机会，来简单谈谈业务与操作代码分离的思想。
1、先定义借口类FingerprintOperationCallback ，主要是操作中供给核心业务调用的方法
public interface FingerprintOperationCallback {
/**
* 申请权限失败的回调
*
*/
void onApplypermissionsFail();
/**
* 成功打开指纹模块的回调
*
* status = 1 成功， -1为失败
*/
// void onOpenStatus(int status);
/**
* 打开指纹模块失敗的回调
*
*/
void onFailOpenFP();
/**
* 采集指纹的回调
*
*/
void onReadResult(Bitmap bitmap);
}
2、操作封装类FingerprintUtil，主要是封装了第三方的一些基本用法，比如：打开指纹设备、申请权限、开始采集等等
public class FingerprintUtil {
private static final String TAG = FingerprintUtil.class.getSimpleName();
private static final int FLAG_APPLY_PERMISSIONS_SUCCESS = 100;
private static final int FLAG_APPLY_PERMISSIONS_FAIL = 101;
private static final int FLAG_OPEN_FP_SUCCESS = 102;
private static final int FLAG_OPEN_FP_FAIL = 103;
private static final int FLAG_READ_FP_RESULT_SUCCESS = 104;
private static volatile FingerprintUtil instance;
private Bitmap mFingerprintImage;
private boolean isOpen = false;
private ExecutorService mExecutorService;
private Handler mHandler;
private FingerprintOperationCallback mOperationCallback;
private FP mFp;
private Context mContext;
private boolean isReadSuccess;
private int openStatus;
private Object mLockObject = new Object( );
public static FingerprintUtil getInstance( Context context) {
if ( instance == null ) {
synchronized ( FingerprintUtil.class ) {
if ( instance == null ) {
instance = new FingerprintUtil(context);
}
}
}
return instance;
}
public FingerprintUtil( ) {
}
public FingerprintUtil(Context context) {
this.mContext = context;
}
private void init( ) {
LogUtil.d(TAG,"init====================");
if ( mFp == null ) {
mFp = new FP(mContext);
}
if ( mExecutorService == null ) {
mExecutorService = Executors.newSingleThreadExecutor( );
}
if ( mHandler == null ) {
mHandler = new Handler( mCallback );
}
registerUSBpermisson();
}
/**
* 申请权限的广播
*/
private final BroadcastReceiver mUsbReceiverPermission = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (FP.ACTION_USB_PERMISSION.equals(action)) {
synchronized (this) {
UsbDevice usbDevice = (UsbDevice) intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
//用户允许权限申请true
if (usbDevice != null && intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
//用户同意 ;
//申请权限成功的回调
Message msg;
msg = mHandler.obtainMessage( FLAG_APPLY_PERMISSIONS_SUCCESS );
mHandler.sendMessage( msg );
LogUtil.d(TAG,"用户同意打开指纹模块");
} else {
//用户拒绝
//申请权限失败的回调
Message msg;
msg = mHandler.obtainMessage( FLAG_APPLY_PERMISSIONS_FAIL );
mHandler.sendMessage( msg );
Log.e("jp", "permission denied for device！！！");
ToastUtils.showLongMessage(mContext, R.string.err_no_permission);
}
}
} else if (UsbManager.ACTION_USB_DEVICE_DETACHED.equals(action)) {
}
}
};
/*注册USB权限*/
public void registerUSBpermisson() {
IntentFilter filter = new IntentFilter();
filter.addAction(FP.ACTION_USB_PERMISSION);
filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);//拔出USB
mContext.registerReceiver(mUsbReceiverPermission, filter);
}
public void unregisterReceiver() {
IntentFilter filter = new IntentFilter();
filter.addAction(FP.ACTION_USB_PERMISSION);
mContext.unregisterReceiver(mUsbReceiverPermission);
isReadSuccess = true;
LogUtil.d(TAG,"unregisterReceiver================");
}
/**
* 申请权限
*/
public void applypermissions(){
mExecutorService.execute(mApplypermissions);
}
/**
* 申请权限
*/
private Runnable mApplypermissions = new Runnable() {
@Override
public void run() {
registerUSBpermisson();
}
};
/**
* 权限注销
*/
private Runnable mUnregisterReceiver = new Runnable() {
@Override
public void run() {
unregisterReceiver();
}
};
/**
* 初始化设备
*/
public void initFP( ) {
init( );
}
/**
* 打开指纹模块
*/
public void openFP( ) {
mExecutorService.execute(mOpenFP);
}
/**
* 打开指纹模块
*/
private Runnable mOpenFP = new Runnable() {
@Override
public void run() {
if (mFp.findDevice()) {
if (!mFp.isPermissed()) {
PendingIntent mPermissionIntent = PendingIntent.getBroadcast(mContext, 0, new Intent("FP_Request_USB_PERMISSION"), 0);
mFp.requestPermission(mPermissionIntent);
return;
}
openStatus = mFp.open();
LogUtil.d(TAG,"openFp====openStatus===="+ openStatus);
if (openStatus == 0){
Message msg;
msg = mHandler.obtainMessage( FLAG_OPEN_FP_SUCCESS );
mHandler.sendMessage( msg );
}else if (openStatus == -1){
Message msg;
msg = mHandler.obtainMessage( FLAG_OPEN_FP_FAIL );
mHandler.sendMessage( msg );
}
}
}
};
public void readFPResult(){
mExecutorService.execute(mReadFPResult);
}
/**
* 指纹采集
*/
private Runnable mReadFPResult = new Runnable() {
@Override
public void run() {
isReadSuccess = false;
while (!isReadSuccess) {
LogUtil.d(TAG,"等待指纹输入======");
mFingerprintImage = mFp.read();
if (mFingerprintImage != null) {
isReadSuccess = true;
Message msg;
msg = mHandler.obtainMessage( FLAG_READ_FP_RESULT_SUCCESS );
mHandler.sendMessage( msg );
}
}
}
};
private Callback mCallback = new Callback( ) {
@Override
public boolean handleMessage( Message msg ) {
// TODO Auto-generated method stub
switch ( msg.what ) {
case FLAG_APPLY_PERMISSIONS_SUCCESS :
openFP();
break;
case FLAG_APPLY_PERMISSIONS_FAIL :
if ( mOperationCallback != null ) {
mOperationCallback.onApplypermissionsFail();
}
break;
case FLAG_OPEN_FP_SUCCESS :
readFPResult();
break;
case FLAG_OPEN_FP_FAIL :
if ( mOperationCallback != null ) {
mOperationCallback.onFailOpenFP();
}
break;
case FLAG_READ_FP_RESULT_SUCCESS :
if ( mOperationCallback != null ) {
mOperationCallback.onReadResult(mFingerprintImage);
}
break;
default :
break;
}
return false;
}
};
public void setFingerprintOperationCallback( FingerprintOperationCallback operationCallback ) {
this.mOperationCallback = operationCallback;
}
public void release( ) {
synchronized ( mLockObject ) {
mOperationCallback = null;
if ( mHandler != null ) {
mHandler.removeCallbacksAndMessages( null );
}
if ( mFingerprintImage != null && !mFingerprintImage.isRecycled( ) ) {
mFingerprintImage.recycle( );
mFingerprintImage = null;
}
unregisterReceiver();
}
}
}
3、操作封装类在自己核心业务中使用
FingerprintUtil.getInstance(getActivity()).setFingerprintOperationCallback(mOperationCallback);
FingerprintUtil.getInstance(getActivity()).initFP();
FingerprintUtil.getInstance(getActivity()).openFP();
@Override
public void onDestroy() {
super.onDestroy();
FingerprintUtil.getInstance(getActivity()).release();
}
FingerprintOperationCallback mOperationCallback = new FingerprintOperationCallback() {
@Override
public void onApplypermissionsFail() {
LogUtil.d(TAG,"onApplypermissionsFail==========");
mHandler.sendEmptyMessage(3);
}
@Override
public void onFailOpenFP() {
LogUtil.d(TAG,"onFailOpenFP==========");
mHandler.sendEmptyMessage(1);
}
@Override
public void onReadResult(Bitmap bitmap) {
LogUtil.d(TAG,"onReadResult==========");
Message message = Message.obtain();
message.obj = bitmap;
message.what = 2;
mHandler.sendMessage(message);
}
};