我在处理 Mat 时遵循了所有步骤，包括在调用时将它添加到 AsyncTask，但仍然出现相同的错误，即未找到 native 方法 org.opencv.core.mat.n_mat
代码如下:
package com.example.myfirstapp;
import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import org.json.JSONException;
import org.json.JSONObject;
import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.LoaderCallbackInterface;
import org.opencv.android.OpenCVLoader;
import org.opencv.android.Utils;
import org.opencv.core.Mat;
import com.example.myfirstapp.RegisterMarkerMain.ProcessImage;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.util.Base64;
import android.util.Log;
import android.view.ContextMenu;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.RelativeLayout;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemSelectedListener;
public class CreateApp extends ListActivity {
boolean duplicate = false;
String userID = "";
Intent manage;
String image = "";
Intent refresh;
CandidatesListAdapter adapter;
ProcessImage process;
Mat mRgba;
private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
@Override
public void onManagerConnected(int status) {
Log.i("loading libs", "OpenCV loading status " + status);
switch (status) {
case LoaderCallbackInterface.SUCCESS: {
Log.i("loading libs", "OpenCV loaded successfully");
// Load native library after(!) OpenCV initialization
System.loadLibrary("native_sample");
}
break;
default: {
super.onManagerConnected(status);
}
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_create_app);
manage = new Intent(this, ManageApps.class);
concurrentTasks();
Bundle extras = getIntent().getExtras();
if (extras != null) {
userID = extras.getString("user_id");
Toast.makeText(CreateApp.this, "User id " + userID,
Toast.LENGTH_LONG).show();
}
final Spinner spinner = (Spinner) findViewById(R.id.categories_spinner);
refresh = new Intent(this, ManageApps.class);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
this, R.array.categories_array,
android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parentView,
View selectedItemView, int position, long id) {
// your code here
String category = spinner.getSelectedItem().toString();
Toast.makeText(CreateApp.this,
"Category " + category + " selected",
Toast.LENGTH_SHORT).show();
TextView tv = (TextView) findViewById(R.id.question_title);
tv.setText(category);
}
@Override
public void onNothingSelected(AdapterView<?> parentView) {
// your code here
}
});
ImageView iv = (ImageView) findViewById(R.id.application_logo);
registerForContextMenu(iv);
iv.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View arg0) {
// TODO Auto-generated method stub
return false;
}
});
iv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(CreateApp.this, "Long click to add image",
Toast.LENGTH_LONG).show();
}
});
Button submit = (Button) findViewById(R.id.submit);
submit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
EditText et = (EditText) findViewById(R.id.application_name_edit);
if (et.getText().toString().equals(null)
|| et.getText().toString().equals("")) {
Toast.makeText(CreateApp.this,
"App Name can not be empty.", Toast.LENGTH_SHORT)
.show();
} else {
if (spinner.getSelectedItem().toString().equals("Select")
|| spinner.getSelectedItem().toString().equals("")) {
Toast.makeText(CreateApp.this,
"Cateory must be selected.", Toast.LENGTH_SHORT)
.show();
} else {
new AsyncAppDuplicates().execute();
try {
Thread.sleep(500);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (duplicate == true) {
System.out
.println("Duplicate flag for App Creation inside if "
+ duplicate);
AlertDialog.Builder builder = new AlertDialog.Builder(
CreateApp.this);
builder.setTitle("Warning");
builder.setMessage("An application already exists with this name."
+ "\n" + "Please choose a different name.");
builder.setNegativeButton("Ok",
new DialogInterface.OnClickListener() {
public void onClick(
DialogInterface dialog, int id) {
// if this button is clicked, just
// close
// the dialog box and do nothing
dialog.cancel();
}
});
builder.show();
} else {
concurrentCreate();
Toast.makeText(CreateApp.this,
"Created Successfully", Toast.LENGTH_SHORT)
.show();
System.out.println("Done");
// EditText app = (EditText)
// findViewById(R.id.application_name_edit);
}
}
}
}
});
}
@SuppressLint("NewApi")
private void concurrentTasks() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
new AsyncGetCategories()
.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
System.out.println("getting categories");
} else {
new AsyncGetCategories().execute();
}
}
@SuppressLint("NewApi")
private void concurrentCreate() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
new AsyncCreateApplication()
.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
System.out.println("Creating app");
} else {
new AsyncCreateApplication().execute();
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK)) {
finish();
manage.putExtra("user_id", userID);
startActivity(manage);
}
return super.onKeyDown(keyCode, event);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.create_app, menu);
return true;
}
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenu.ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
getMenuInflater().inflate(R.menu.contextmenu, menu);
menu.setHeaderTitle("Select an Option");
}
@Override
public boolean onContextItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_take:
Toast.makeText(CreateApp.this, "Opening the Camera",
Toast.LENGTH_SHORT).show();
Intent camera = new Intent(
android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(camera, 0);
return true;
case R.id.menu_choose:
Toast.makeText(CreateApp.this, "Opening the Gallery",
Toast.LENGTH_SHORT).show();
Intent gallery = new Intent();
gallery.setType("image/*");
gallery.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(
Intent.createChooser(gallery, "Select Picture"), 1);
return true;
}
return super.onContextItemSelected(item);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
ImageView iv = new ImageView(this);
switch (requestCode) {
case 0:
if (resultCode == RESULT_OK) {
// Uri selectedImage = data.getData();
Toast.makeText(this, "Adding Photo From Camera",
Toast.LENGTH_LONG).show();
iv = (ImageView) findViewById(R.id.application_logo);
Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
iv.setImageBitmap(thumbnail);
Intent r = new Intent(this, RegisterMarkerMain.class);
//startActivity(r);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
thumbnail.compress(Bitmap.CompressFormat.PNG, 100, baos);
byte[] b = baos.toByteArray();
image = Base64.encodeToString(b, Base64.DEFAULT);
//r.putExtra("BitmapImage", image);
//startActivityForResult(r, 13);
Toast.makeText(this, "Marker Valid", Toast.LENGTH_LONG).show();
adapter = new CandidatesListAdapter(this);
setListAdapter(adapter);
process = new ProcessImage(this, thumbnail);
process.execute();
//call the main layout from xml
//RelativeLayout mainLayout = (RelativeLayout)findViewById(R.id.create_layout_id);
//create a view to inflate the layout_item (the xml with the textView created before)
//View view = getLayoutInflater().inflate(R.layout.layout_item, mainLayout,false);
//add the view to the main layout
// mainLayout.addView(view);
}
break;
case 1:
if (resultCode == RESULT_OK) {
Toast.makeText(this, "Adding Photo From Gallery",
Toast.LENGTH_LONG).show();
Uri targetUri = data.getData();
iv = (ImageView) findViewById(R.id.application_logo);
Bitmap thumbnail = null;
try {
thumbnail = BitmapFactory.decodeStream(getContentResolver()
.openInputStream(targetUri));
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
iv.setImageBitmap(thumbnail);
ByteArrayOutputStream baos=new ByteArrayOutputStream();
thumbnail.compress(Bitmap.CompressFormat.JPEG,100, baos);
byte [] b=baos.toByteArray();;
try{
System.gc();
image=Base64.encodeToString(b, Base64.DEFAULT);
}catch(Exception e){
e.printStackTrace();
}catch(OutOfMemoryError e){
baos=new ByteArrayOutputStream();
thumbnail.compress(Bitmap.CompressFormat.JPEG,50, baos);
b=baos.toByteArray();
image=Base64.encodeToString(b, Base64.DEFAULT);
Log.e("EWN", "Out of memory error catched");
}
Toast.makeText(this, "Marker Valid", Toast.LENGTH_LONG).show();
}
break;
}
}
public void managePrivacy(View v) {
Intent privacyIntent = new Intent(this, ManagePrivactActivity.class);
startActivity(privacyIntent);
}
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
Marker o = (Marker) this.getListAdapter().getItem(position);
Toast.makeText(this, "strength " + o.descriptor.rows(),
Toast.LENGTH_SHORT).show();
// TODO: both Image and descriptor should be sent to server combined
// with location and other info.
// Descriptor of image is n rows * 64 numbers
}
public native void loadCand(long nativeObjAddr, long descriptoradd, int i);
public native int findMarkersNative(long imgAdd);
public class ProcessImage extends AsyncTask<Void, Void, ArrayList<Marker>> {
private Context mContext;
Bitmap bmp;
public ProcessImage(Context context, Bitmap bmp) {
mContext = context;
mRgba = new Mat();
this.bmp = bmp;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
getListView().setVisibility(View.GONE);
//loading.setVisibility(View.VISIBLE);
Utils.bitmapToMat(bmp, mRgba);
}
@Override
protected void onPostExecute(ArrayList<Marker> result) {
getListView().setVisibility(View.VISIBLE);
//loading.setVisibility(View.GONE);
adapter.updateData(result);
// display
Utils.matToBitmap(mRgba, bmp);
//imageView.setImageBitmap(bmp);
super.onPostExecute(result);
}
@Override
protected ArrayList<Marker> doInBackground(Void... params) {
ArrayList<Marker> imagesCand = new ArrayList<Marker>();
// process
int candCount = findMarkersNative(mRgba.getNativeObjAddr());
for (int i = 0; i < candCount; i++) {
Mat cand = new Mat();
Mat descriptor = new Mat();
loadCand(cand.getNativeObjAddr(),
descriptor.getNativeObjAddr(), i);
if (descriptor.rows() > 0) {
Bitmap bmp3 = Bitmap.createBitmap(cand.cols(), cand.rows(),
Bitmap.Config.ARGB_8888);
Utils.matToBitmap(cand, bmp3);
imagesCand.add(new Marker(bmp3, descriptor));
}
}
return imagesCand;
}
}
private class AsyncCreateApplication extends AsyncTask<String, Void, Void> {
@Override
protected Void doInBackground(String... arg0) {
EditText et = (EditText) findViewById(R.id.application_name_edit);
String s = et.getText().toString();
TextView tv = (TextView) findViewById(R.id.question_title);
String c = tv.getText().toString();
System.out.println("Category yafanan " + c);
ServerAPI.createApplication(s, c, userID, image);
System.out.println("in Background");
return null;
}
protected void onPostExecute(Void result) {
EditText et = (EditText) findViewById(R.id.application_name_edit);
refresh.putExtra("app_name", et.getText().toString());
System.out.println("App created " + et.getText().toString());
refresh.putExtra("user_id", userID);
setResult(RESULT_OK, refresh);
// startActivity(edit);
startActivity(refresh);
}
}
private class AsyncGetCategories extends AsyncTask<Void, Void, Void> {
ArrayList<String> al = null;
ArrayAdapter<String> dataAdapter;
Spinner category = (Spinner) findViewById(R.id.categories_spinner);
@Override
protected Void doInBackground(Void... params) {
System.out.println("do in background");
al = ServerAPI.getCategories();
System.out.println("ArrayList fetched");
return null;
}
@Override
protected void onPostExecute(Void result) {
dataAdapter = new ArrayAdapter<String>(CreateApp.this,
android.R.layout.simple_spinner_item,
new ArrayList<String>());
dataAdapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
category.setAdapter(dataAdapter);
dataAdapter.add("Select");
for (int i = 0; i < al.size(); i++) {
dataAdapter.add(al.get(i));
// System.out.println(al.remove(i));
}
return;
}
}
private class AsyncAppDuplicates extends AsyncTask<String, Void, Void> {
@Override
protected Void doInBackground(String... arg0) {
EditText et = (EditText) findViewById(R.id.application_name_edit);
String name = et.getText().toString();
String s = ServerAPI.checkAppDuplicates(name, userID);
System.out.println("Checked and " + s);
if (s.equals("Already there")) {
duplicate = true;
} else {
duplicate = false;
}
return null;
}
}
}
我在谷歌上搜索了很多，但我无法弄清楚哪里出了问题。 非常感谢任何帮助。
最佳答案
我解决了这个问题，在 onCreate 之前，您在其中声明了 Activity 的所有内容:
static {
if (!OpenCVLoader.initDebug()) {
// Handle initialization error
}
}
关于android - 找不到 native 方法 org.opencv.core.mat.n_mat-Android，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/16409202/