Alpr system
I want to share some source code I have used in a alpr project.Click here to see the alpr project online.Of course,the source code wich is used in the project has been updated,not completely the same as the bellow one.
Source code
import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.text.format.DateFormat;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import com.openalpr.api.DefaultApi;
import com.openalpr.api.invoker.ApiException;
import com.openalpr.api.models.InlineResponse200;
import com.yalantis.ucrop.UCrop;
import com.yalantis.ucrop.UCropActivity;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Calendar;
import java.util.Locale;
public class MainActivity extends AppCompatActivity {
private final DefaultApi api = new DefaultApi();
private static final String TAG = “MainActivity”;
Button reconize,select;
TextView result,plate;
ImageView showImage;
Spinner spinner;
String secretKey = “sk_960d6f4c62d1c20452c7613e”;
String url = “https://qnwww2.autoimg.cn/youchuang/g6/M0A/FA/29/autohomecar__wKgH3FkZCr-AFH7zAAFPFgtP6pc751.jpg?imageView2/2/w/752|watermark/2/text/TEkzMw0K5rG96L2m5LmL5a62/font/5b6u6L2v6ZuF6buR/fontsize/270/fill/d2hpdGU=/dissolve/100/gravity/SouthEast/dx/5/dy/5";
File cameraFile,cropFile;
private boolean isFromfile = false;
String country = “us”;
final Integer recognizeVehicle = 0;
final String state = “”;
final Integer returnImage = 1;
final Integer topn = 10;
final String prewarp = “”;
private String cropPath = “”;
String[] countrys ;
String[] countryCodes ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
reconize = (Button) findViewById(R.id.reconize);
select = (Button) findViewById(R.id.selectImage);
result = (TextView) findViewById(R.id.result);
showImage = (ImageView) findViewById(R.id.imageShow);
plate = (TextView) findViewById(R.id.plate);
spinner = (Spinner) findViewById(R.id.spinner);
// GlideUtils.setUrlImage(this,url,showImage);
countrys = getResources().getStringArray(R.array.countrys);
countryCodes = getResources().getStringArray(R.array.country_codes);
select.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String filename = DateFormat.format(“yyyyMMdd_hhmmss”, Calendar.getInstance(Locale.CHINA)) + “.jpg”;
cameraFile = new File(Environment.getExternalStorageDirectory() + “/Pictures/Camera/” + filename);
if(!cameraFile.exists()){
try {
cameraFile.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
Intent intent0 = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (Build.VERSION.SDK_INT < 24) {
intent0 = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent0.putExtra(“android.intent.extras.CAMERA_FACING”, 0);
intent0.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(cameraFile));
} else {
ContentValues contentValues = new ContentValues(1);
intent0.putExtra(“android.intent.extras.CAMERA_FACING”, 0);
contentValues.put(MediaStore.Images.Media.DATA, cameraFile.getAbsolutePath());
Uri uri = MainActivity.this.getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, contentValues);
intent0.putExtra(MediaStore.EXTRA_OUTPUT, uri);
}
isFromfile = true;
startActivityForResult(intent0, 200);
}
});
reconize.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
result.setText(“identifying…”);
plate.setText(“”);
try {
new Thread(){
@Override
public void run() {
super.run();
InlineResponse200 response = null;
try {
if(isFromfile){
response = api.recognizeFile(cropFile, secretKey, country, recognizeVehicle, state, returnImage, topn, prewarp);
}else {
response = api.recognizeUrl(url, secretKey, country, recognizeVehicle, state, returnImage, topn, prewarp);
}
} catch (ApiException e) {
e.printStackTrace();
}
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final InlineResponse200 finalResponse = response;
runOnUiThread(new Runnable() {
@Override
public void run() {
if(finalResponse == null){
Toast.makeText(MainActivity.this, “识别失败”, Toast.LENGTH_SHORT).show();
return;
}
Toast.makeText(MainActivity.this, “识别成功”, Toast.LENGTH_SHORT).show();
if(finalResponse.getResults()!=null && finalResponse.getResults().size()>=1)
plate.setText(“license plate number：”+finalResponse.getResults().get(0).getPlate());
result.setText(“result:”+finalResponse.toString());
}
});
}
}.start();
} catch (Exception e) {
e.printStackTrace();
}
}
});
ArrayAdapter<String> product_adapter = new ArrayAdapter<String>(this, android.R.layout.select_dialog_singlechoice, countrys);
spinner.setAdapter(product_adapter);
spinner.setSelection(12);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
country = countryCodes[position];
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(resultCode != RESULT_OK){
return;
}
switch (requestCode) {
case 200:
if (!cameraFile.exists()) {
return ;
}
Bitmap bitmap = null;
if (resultCode== Activity.RESULT_OK){
try {
FileInputStream fis = new FileInputStream(cameraFile);
bitmap = BitmapFactory.decodeStream(fis);
fis.close();
} catch (Exception e) {
e.printStackTrace();
}
if (bitmap!=null) {
showImage.setImageBitmap(bitmap);
}
cropPath = startUCrop(this,cameraFile.getPath(),UCrop.REQUEST_CROP,16,9);
}
break;
case UCrop.REQUEST_CROP:
final Uri resultUri = UCrop.getOutput(data);
showImage.setImageURI(resultUri);
cropFile = new File(cropPath);
break;
default:
break;
}
}
/**
* Start the cutting
* @param activity context
* @param sourceFilePath You need to crop the absolute path of the image
* @param requestCode such as：UCrop.REQUEST_CROP
* @param aspectRatioX Crop image aspect ratio
* @param aspectRatioY Crop image aspect ratio
* @return
*/
public static String startUCrop(Activity activity, String sourceFilePath,
int requestCode, float aspectRatioX, float aspectRatioY) {
Uri sourceUri = Uri.fromFile(new File(sourceFilePath));
File outDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
if (!outDir.exists()) {
outDir.mkdirs();
}
File outFile = new File(outDir, System.currentTimeMillis() + “.jpg”);
//Absolute path of cropped image
String cameraScalePath = outFile.getAbsolutePath();
Uri destinationUri = Uri.fromFile(outFile);
//Initialization, first parameter: image to be cropped;
Second parameter: crop the image
UCrop uCrop = UCrop.of(sourceUri, destinationUri);
//Initialize the UCrop configuration
UCrop.Options options = new UCrop.Options();
//Set an actionable gesture to crop the image
options.setAllowedGestures(UCropActivity.SCALE, UCropActivity.ROTATE, UCropActivity.ALL);
//Whether to hide the bottom container, shown by default
options.setHideBottomControls(true);
// //Set toolbar color
// options.setToolbarColor(ActivityCompat.getColor(activity, R.color.colorPrimary));
// //Set the status bar color
// options.setStatusBarColor(ActivityCompat.getColor(activity, R.color.colorPrimary));
//Can I adjust the clipping box
options.setFreeStyleCropEnabled(true);
//UCrop seting
uCrop.withOptions(options);
//Set the aspect ratio of cropped images, such as 16:9
uCrop.withAspectRatio(aspectRatioX, aspectRatioY);
//uCrop.useSourceImageAspectRatio();
//Skip clipping page
uCrop.start(activity, requestCode);
return cameraScalePath;
}
}
