我还是Java和Android编程的新手，所以我对某些编程方法感到困惑。我只是想问一下，如何在另一个类中使用方法match_eye（）的返回值？我只想在另一个类（FdActivity）中使用mmres.minVal和mmres.maxVal值并在我的活动类中显示这些值。任何人都会向我显示执行此操作的代码:)谢谢
class FdView extends SampleCvViewBase {
public void setMinFaceSize(float faceSize)
{
.........
}
........
........
double match_eye(Rect area, Mat mTemplate,int type){
Point matchLoc;
Mat mROI = mGray.submat(area);
int result_cols = mGray.cols() - mTemplate.cols() + 1;
int result_rows = mGray.rows() - mTemplate.rows() + 1;
//Check for bad template size
if(mTemplate.cols()==0 ||mTemplate.rows()==0){
return 0.0;
}
mResult = new Mat(result_cols,result_rows, CvType.CV_32FC1);
switch (type){
//TM_SQDIFF Matching Method
case TM_SQDIFF:
Imgproc.matchTemplate(mROI, mTemplate, mResult, Imgproc.TM_SQDIFF);
break;
//TM_SQDIFF Matching Method
case TM_SQDIFF_NORMED:
Imgproc.matchTemplate(mROI, mTemplate, mResult, Imgproc.TM_SQDIFF_NORMED);
break;
//TM_SQDIFF Matching Method
case TM_CCOEFF:
Imgproc.matchTemplate(mROI, mTemplate, mResult, Imgproc.TM_CCOEFF);
break;
//TM_SQDIFF Matching Method
case TM_CCOEFF_NORMED:
Imgproc.matchTemplate(mROI, mTemplate, mResult, Imgproc.TM_CCOEFF_NORMED) ;
break;
//TM_SQDIFF Matching Method
case TM_CCORR:
Imgproc.matchTemplate(mROI, mTemplate, mResult, Imgproc.TM_CCORR) ;
break;
//TM_SQDIFF Matching Method
case TM_CCORR_NORMED:
Imgproc.matchTemplate(mROI, mTemplate, mResult, Imgproc.TM_CCORR_NORMED) ;
break;
}
Core.MinMaxLocResult mmres = Core.minMaxLoc(mResult);
// there is difference in matching methods - best match is max/min value
if(type == TM_SQDIFF || type == TM_SQDIFF_NORMED)
{
matchLoc = mmres.minLoc;
}
else
{
matchLoc = mmres.maxLoc;
}
Point matchLoc_tx = new Point(matchLoc.x+area.x,matchLoc.y+area.y);
Point matchLoc_ty = new Point(matchLoc.x + mTemplate.cols() + area.x , matchLoc.y + mTemplate.rows()+area.y );
Core.rectangle(mRgba, matchLoc_tx,matchLoc_ty, new Scalar(255,255, 255, 255) ,2);
if(type == TM_SQDIFF || type == TM_SQDIFF_NORMED){
return mmres.maxVal;
}
else {
return mmres.minVal;
}
}
}
FdActivity Class
public class FdActivity extends Activity {
private static final String TAG = "Sample::Activity";
private MenuItem mItemFace50;
private MenuItem mItemFace40;
private MenuItem mItemFace30;
private MenuItem mItemFace20;
private MenuItem mItemType;
private FdView mView;
//Popup Window
private LayoutInflater inflater;
private PopupWindow pw;
private View popupView;
public static int method = 1;
//Timer Initializer
public int timer_start = 25000;
//Address Initializer
private String Address_location = "Ramakrishna Road, Colombo 00600, Sri Lanka";
//Sound Alerts
private MediaPlayer warning_sound;
private MediaPlayer lowbattery_alert;
private BaseLoaderCallback mOpenCVCallBack = new BaseLoaderCallback(this) {
@SuppressWarnings("deprecation")
@Override
public void onManagerConnected(int status) {
switch (status) {
case LoaderCallbackInterface.SUCCESS: {
Log.i(TAG, "OpenCV loaded successfully");
//Load native libs after OpenCV initialization
System.loadLibrary("detection_based_tracker");
// Create and set View
mView = new FdView(mAppContext);
mView.setDetectorType(mDetectorType);
mView.setMinFaceSize(0.2f);
//Start Tracking btn
Button btn_track = new Button(getApplicationContext());
btn_track.setText("Settings");
btn_track.setBackgroundResource(R.drawable.custombutton_settings);
btn_track.setTextColor(Color.WHITE);
btn_track.setTypeface(null, Typeface.BOLD);
RelativeLayout.LayoutParams btnp = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
btnp.addRule(RelativeLayout. ALIGN_PARENT_RIGHT);
btn_track.setId(2);
btn_track.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
//Popup Menu
pw = new PopupWindow(getApplicationContext());
pw.setTouchable(true);
pw.setFocusable(true);
pw.setOutsideTouchable(true);
pw.setTouchInterceptor(new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_OUTSIDE) {
pw.dismiss();
return true;
}
return false;
}
});
pw.setWidth(WindowManager.LayoutParams.WRAP_CONTENT);
pw.setHeight(WindowManager.LayoutParams.WRAP_CONTENT);
pw.setOutsideTouchable(false);
pw.setContentView(popupView);
pw.showAsDropDown(v, 0, 0);
}
});
final TextView count_down = new TextView(getApplicationContext());
count_down.setText("Driver's State Recognition System");
count_down.setGravity(Gravity.CENTER);
count_down.setBackgroundColor(Color.BLACK);
count_down.setTextColor(Color.WHITE);
count_down.setTypeface(null, Typeface.BOLD);
RelativeLayout.LayoutParams textTimer = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
textTimer.setMargins(30, 0, 0, 30);
textTimer.addRule(RelativeLayout. ALIGN_PARENT_BOTTOM);
count_down.setId(6);
//Count Timer
final CountDownTimer cntr_aCounter = new CountDownTimer(timer_start, 1000) {
public void onTick(long millisUntilFinished) {
}
public void onFinish() {
//Start Alert Sound
warning_sound.start();
warning_sound.setLooping(true);
Toast.makeText(getBaseContext(), "Alerting Started...", Toast.LENGTH_LONG).show();
//Start Vibration
final Vibrator vibe = (Vibrator)getSystemService(VIBRATOR_SERVICE);
vibe.vibrate(20000);
//Start Alert Box and Emergency Text Alert
final AlertDialog alertDialog_warning = new AlertDialog.Builder(FdActivity.this).create();
alertDialog_warning.setCancelable(false);
alertDialog_warning.setTitle("WARNING");
alertDialog_warning.setMessage("Drowsiness Detected..Please Respond");
alertDialog_warning.setIcon(R.drawable.warning_icon);
alertDialog_warning.setButton("Respond", new DialogInterface.OnClickListener() {
final CountDownTimer timer_count_down = new CountDownTimer(25000, 1000) {
public void onTick(long millisUntilFinished) {
count_down.setText("Seconds Remaining To Respond : " + millisUntilFinished / 1000);
}
public void onFinish() {
//Emergency Text Alert
String phoneNo = "0712055056";
String sms = "Emergancy Alert !...Location : " + Address_location;
try {
SmsManager smsManager = SmsManager.getDefault();
smsManager.sendTextMessage(phoneNo, null, sms, null, null);
Toast.makeText(getApplicationContext(), "Emergancy Alert Sent !",Toast.LENGTH_LONG).show();
}
catch (Exception e) {
Toast.makeText(getApplicationContext(),"Emergancy Alert Sending Failed",Toast.LENGTH_LONG).show();
e.printStackTrace();
}
//Stop all active alerts
count_down.setText("Not Responded Emergancy Alert Sent");
Animation anim = new AlphaAnimation(0.0f, 1.0f);
anim.setDuration(50); //You can manage the time of the blink with this parameter
anim.setStartOffset(20);
anim.setRepeatMode(Animation.REVERSE);
anim.setRepeatCount(Animation.INFINITE);
count_down.startAnimation(anim);
count_down.setTextColor(Color.RED);
alertDialog_warning.cancel();
warning_sound.pause();
vibe.cancel();
timer_count_down.cancel();
}
}.start();
public void onClick(final DialogInterface alertDialog_warning, final int which) {
alertDialog_warning.cancel();
//Stop Alert Sound
warning_sound.pause();
vibe.cancel();
timer_count_down.cancel();
count_down.setText("Driver's State Recognition System");
finish();
startActivity(getIntent());
}
});
alertDialog_warning.show();
}
};
cntr_aCounter.start();
//Turn off btn
Button btn_off = new Button(getApplicationContext());
btn_off.setText("Switch Off");
btn_off.setBackgroundResource(R.drawable.custombutton_settings);
btn_off.setTextColor(Color.WHITE);
btn_off.setTypeface(null, Typeface.BOLD);
RelativeLayout.LayoutParams btnp1 = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
btnp1.addRule(RelativeLayout. ALIGN_PARENT_LEFT);
btn_off.setId(3);
btn_off.setOnClickListener(new OnClickListener() {
public void onClick(View x) {
//Alert Dialog Box
AlertDialog.Builder alertDialog = new AlertDialog.Builder(FdActivity.this);
alertDialog.setTitle("WARNING");
alertDialog.setMessage(" Switch off Drowsiness Detection. \n Are you sure ?");
alertDialog.setIcon(R.drawable.warning_icon);
alertDialog.setCancelable(false); // This blocks the 'BACK' button
// Setting "Yes" Btn
alertDialog.setPositiveButton("YES",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
finish();
cntr_aCounter.cancel();
}
});
// Setting "NO" Btn
alertDialog.setNegativeButton("NO",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(),"Tracking Process Continued", Toast.LENGTH_LONG).show();
dialog.cancel();
}
});
alertDialog.show();
}
});
RelativeLayout frameLayout = new RelativeLayout(
getApplicationContext());
frameLayout.addView(mView, 0);
frameLayout.addView(btn_track, btnp);
frameLayout.addView(btn_off, btnp1);
frameLayout.addView(count_down, textTimer);
setContentView(frameLayout);
// Check native OpenCV camera
if (!mView.openCamera()) {
AlertDialog ad = new AlertDialog.Builder(mAppContext).create();
ad.setCancelable(false); // This blocks the 'BACK' button
ad.setMessage("Fatal Error: Can't Open Camera!");
ad.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
finish();
}
});
ad.show();
}
}
break;
default: {
super.onManagerConnected(status);
}
break;
}
}
};
private int mDetectorType = 0;
private String[] mDetectorName;
public FdActivity() {
Log.i(TAG, "Instantiated new " + this.getClass());
mDetectorName = new String[2];
mDetectorName[FdView.JAVA_DETECTOR] = "Java";
mDetectorName[FdView.NATIVE_DETECTOR] = "Native (tracking)";
}
@Override
protected void onPause() {
Log.i(TAG, "onPause");
super.onPause();
if (mView != null)
mView.releaseCamera();
}
@SuppressWarnings("deprecation")
@Override
protected void onResume() {
Log.i(TAG, "onResume");
super.onResume();
if (mView != null && !mView.openCamera()) {
AlertDialog ad = new AlertDialog.Builder(this).create();
ad.setCancelable(false); // This blocks the 'BACK' button
ad.setMessage("Fatal error: can't open camera!");
ad.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
finish();
}
});
ad.show();
}
}
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
Log.i(TAG, "onCreate");
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
//Sound Alert
warning_sound = MediaPlayer.create(this, R.raw.warning_alert);
lowbattery_alert = MediaPlayer.create(this, R.raw.low_battery);
//Popup menu
inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
popupView = inflater.inflate(R.layout.popup_menu_layout, null, false);
Log.i(TAG, "Trying to load OpenCV library");
if (!OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_2, this,mOpenCVCallBack)) {
Log.e(TAG, "Cannot connect to OpenCV Manager");
}
//battery
this.registerReceiver(this.batteryInfoReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
Log.i(TAG, "onCreateOptionsMenu");
mItemFace50 = menu.add("Face size 50%");
mItemFace40 = menu.add("Face size 40%");
mItemFace30 = menu.add("Face size 30%");
mItemFace20 = menu.add("Face size 20%");
mItemType = menu.add(mDetectorName[mDetectorType]);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
Log.i(TAG, "Menu Item selected " + item);
if (item == mItemFace50)
mView.setMinFaceSize(0.5f);
else if (item == mItemFace40)
mView.setMinFaceSize(0.4f);
else if (item == mItemFace30)
mView.setMinFaceSize(0.3f);
else if (item == mItemFace20)
mView.setMinFaceSize(0.2f);
else if (item == mItemType) {
mDetectorType = (mDetectorType + 1) % mDetectorName.length;
item.setTitle(mDetectorName[mDetectorType]);
mView.setDetectorType(mDetectorType);
}
return true;
}
//Popup Menu Actions
public void clickOne(View v) {
pw.dismiss();
mView.resetLearFramesCount();
Toast.makeText(getApplicationContext(), "Please wait..Template Recreating", Toast.LENGTH_LONG).show();
}
public void clickTwo(View v) {
pw.dismiss();
Toast.makeText(getBaseContext(), "Please wait..Switching Camera", Toast.LENGTH_LONG).show();
}
public void clickThree(View v) {
pw.dismiss();
Toast.makeText(getBaseContext(), "Please wait..Changing Tracking Method", Toast.LENGTH_LONG).show();
}
public void clickFour(View v) {
pw.dismiss();
Toast.makeText(getBaseContext(), "Please wait..Changing Tracking Method", Toast.LENGTH_LONG).show();
//Alert Dialog Box
AlertDialog.Builder alertDialog = new AlertDialog.Builder(FdActivity.this);
alertDialog.setCancelable(false);
alertDialog.setTitle("Exit Detection");
alertDialog.setMessage(" WARNING...You are about to exit system");
alertDialog.setIcon(R.drawable.warning_icon);
alertDialog.setPositiveButton("Continue", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
alertDialog.setNegativeButton("System Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
finish();
startActivity(new Intent("org.opencv.samples.facedetect.CLEARSCREENSETTINGS"));
}
});
alertDialog.show();
}
private BroadcastReceiver batteryInfoReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
int level= intent.getIntExtra(BatteryManager.EXTRA_LEVEL,0);
int plugged= intent.getIntExtra(BatteryManager.EXTRA_PLUGGED,0);
if(plugged==1){
Toast.makeText(getApplicationContext(), "Device Pluged In", Toast.LENGTH_LONG).show();
lowbattery_alert.pause();
}
if(plugged==0 && level > 20){
Toast.makeText(getApplicationContext(), "WARNING : Device Not Pluged In", Toast.LENGTH_LONG).show();
lowbattery_alert.pause();
}
else if(plugged==0 && level <= 20){
Toast.makeText(getApplicationContext(), "WARNING : Battery Low Please Plug In", Toast.LENGTH_LONG).show();
//alert sound
lowbattery_alert.start();
//Start Vibration
final Vibrator vibe = (Vibrator)getSystemService(VIBRATOR_SERVICE);
vibe.vibrate(20000);
//Alert Dialog Box
AlertDialog.Builder alertDialog = new AlertDialog.Builder(FdActivity.this);
alertDialog.setCancelable(false);
alertDialog.setTitle("Battery Low (" + level + "%)");
alertDialog.setMessage(" WARNING...Battery Low Please Connect The Charger");
alertDialog.setIcon(R.drawable.warning_icon);
// Setting "Switch Off" Btn
alertDialog.setPositiveButton("Switch Off", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
finish();
lowbattery_alert.pause();
vibe.cancel();
}
});
// Setting "Continue" Btn
alertDialog.setNegativeButton("Continue", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(),"Tracking Process Continued", Toast.LENGTH_LONG).show();
dialog.cancel();
vibe.cancel();
lowbattery_alert.pause();
}
});
alertDialog.show();
}
}
};
public void onBackPressed() {
Toast.makeText(getBaseContext(), "Please click Switch off button to deactivate the system", Toast.LENGTH_LONG).show();
}
}
答案 0 :(得分：4)
据我所知，你有Activity，你想要显示两个你想从另一个类得到的值。您无法从一个函数返回两个值，这就是为什么我建议您创建自己的Object来保存这些值，然后您可以从match_eye()返回自定义对象，并从您的值中获取值Activity。以下是示例代码：
MyCustomObject.java
public MyObject{
private int mFirstValue;
private int mSecondValue;
// public constructor
public MyObject(int firstValue, int secondValue){
this.mFirstValue = firstValue;
this.mSecondValue = secondValue;
}
// first value getter
public int getFirstValue(){
return mFirstValue;
}
// second value getter;
public int getSecondValue(){
return mSecondValue;
}
}
在你的match_eye()中你可以做类似的事情：
public MyObject match_eye(Rect area, Mat mTemplate,int type){
//do your calculations here ...
int firstValue = 0; // get first value
int secondValue = 0; // get second value
return new MyObject(firstValue, secondValue);
}
并在您的Activity中，您只需致电：
MyObject mCurrentObject = FdView.match_eye(/*params*/); // static call as example
if(mCurrentObject != null){
int myFirstValue = mCurrentObject.getFirstValue();
int mySecondValue = mCurrentObject.getSecondValue();
// Show these values in your Activity.
}
答案 1 :(得分：1)
将您定义方法的类的对象放入第二个活动，并使用如下代码：
testing t1 = new testing();
double returnval = t1.match_eye(yourarea, youmTemplate,yourtype);
System.out.println(returnval);
使用Intent发送值：
Intent i = new Intent(context,MainActivity.class)
.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
i.putExtra("var", returnval)
context.startActivity(i);