java - 从数组中获取最后一个元素

Question

这个问题很久没解决了。我有一些数据写在 csv 文件中。我想将这些元素写入 String 数组，以便能够在下一节课中使用它们，但数组中的每个元素都等于最后一个元素，我不知道我做错了什么，我需要这方面的帮助。

在这个类中，我从 saved.csv 文件中读取并将其写入字符串数组，接下来我通过将这些元素写回新的 csv 文件来检查此写入 - 检查，但不是在每个文件中获取不同的值我的线和上一条一样。

public class MainActivity extends AppCompatActivity {

Button button;
Button button2;
Button button3;
DescriptorMatcher matcher;
static String name2;
static String color2;
String x2;
String y2;
float xsec;
float ysec;
Mat desc2;
static String descriptor2;
InputStream fis = null;
String line;
String path  = Environment.getExternalStorageDirectory().getAbsolutePath()+"/Objects";
File file = new File(path+"/saved.csv");
File file2 = new File(path+"/check.csv");
int numer = 0;
public static String[] dataToSave = null;
public static ObjectRep[] objectTab = new ObjectRep[25];


static {
    if (!OpenCVLoader.initDebug()) {
        // Handle initialization error
    }
}
private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this)
{
    @Override
    public void onManagerConnected(int status) {
        switch (status) {
            case LoaderCallbackInterface.SUCCESS:  // Callback method, called after OpenCV library initialization
            {
                FeatureDetector featureDetector = FeatureDetector.create(FeatureDetector.ORB); //or BRISK
                MatOfKeyPoint keyPoints = new MatOfKeyPoint();
                Mat descriptors= new Mat();
               // desc2 = new Mat();
                DescriptorExtractor extractor = DescriptorExtractor.create(DescriptorExtractor.ORB); //32Bytes per KeyPoint
                DescriptorMatcher matcher = DescriptorMatcher.create(DescriptorMatcher.BRUTEFORCE_HAMMINGLUT);

            } break;
            default:
            {
                super.onManagerConnected(status);
            } break;
        }
    }
};


@Override
protected void onCreate(final Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    readAndWrite();
    Log.d("Name of 5 " + objectTab[5].name, "x" + objectTab[5].x);
    Log.d("Name of 0 "+objectTab[0].name,"x "+objectTab[0].x);
    Log.d("Name of 1 "+objectTab[1].name,"x "+objectTab[1].x);
    Log.d("Name of 3 "+objectTab[3].name,"x "+objectTab[3].x);
    for(int i=0; i<objectTab.length; i++) {
        dataToSave = new String[]{objectTab[i].name, objectTab[i].color, objectTab[i].desc.toString(), String.valueOf(objectTab[i].x), String.valueOf(objectTab[i].y)};

        save(file2, dataToSave);
    }

    button = (Button) findViewById(R.id.button);
    button2 = (Button) findViewById(R.id.button2);
    button3 = (Button) findViewById(R.id.button3);
    button.setFocusable(true);

    button.setOnClickListener(new View.OnClickListener() {

        public void onClick(View view) {
            Intent i = new Intent(getApplicationContext(),AddingObject.class);
            MainActivity.this.startActivity(i);

        }
    });

    button2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(getApplicationContext(),LookObject.class);
            MainActivity.this.startActivity(intent);


        }
    });

    button3.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            android.os.Process.killProcess(android.os.Process.myPid());
            System.exit(1);
        }
    });
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

@Override
protected void onResume() {
    super.onResume();
    OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_0_0, this, mLoaderCallback);
}


@Override
public void onBackPressed() {
    moveTaskToBack(true);
}

// Before 2.0
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        moveTaskToBack(true);
        return true;
    }
    return super.onKeyDown(keyCode, event);
}

public void readAndWrite() {
    try {
        fis = new FileInputStream(file);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }
    try {

        if (fis != null) {

            // prepare the file for reading
            InputStreamReader chapterReader = new InputStreamReader(fis);
            BufferedReader buffreader = new BufferedReader(chapterReader);
            int j = 1;
            // read every line of the file into the line-variable, on line at the time
            for (int i = 0; i < 150; i++, j++) {
                // do {
                line = buffreader.readLine();
                if (j == 1) {
                    name2 = line;
                } else if (j == 2) {
                    color2 = line;
                } else if (j == 3) {

                    descriptor2 = line;

                    File image = new File(descriptor2);
                    BitmapFactory.Options bmOptions = new BitmapFactory.Options();
                    Bitmap bitmap = BitmapFactory.decodeFile(image.getAbsolutePath(), bmOptions);
                    bitmap = Bitmap.createScaledBitmap(bitmap, bitmap.getWidth(), bitmap.getHeight(), true);
                    desc2 = new Mat(bitmap.getHeight(), bitmap.getWidth(), CvType.CV_8UC1);
                    Utils.bitmapToMat(bitmap, desc2);
                    Imgproc.cvtColor(desc2, desc2, Imgproc.COLOR_RGB2GRAY);
                    //desc2 = Imgcodecs.imread(descriptor2);
                } else if (j == 4) {
                    x2 = line;
                    xsec = Float.valueOf(x2);
                } else if (j == 5) {
                    y2 = line;
                    ysec = Float.valueOf(y2);

                    j = 0;
                    objectTab[numer] = null;
                    objectTab[numer] = new ObjectRep(name2, color2, desc2, xsec, ysec);
                    Log.d("Przedmiot" + objectTab[numer].name, " ");
                    if(i==5){
                        Log.d("Przedmiot i=5" + objectTab[5].name, " ");
                    }

                    clear();
                    if (objectTab[numer] != null) {
                        Toast.makeText(getApplicationContext(), "Object added ", Toast.LENGTH_SHORT).show();
                    }
                    numer++;
                }

            }


        }
    } catch (Exception e) {
        e.printStackTrace();
        Toast.makeText(getApplicationContext(), "adding failed", Toast.LENGTH_SHORT).show();
    } finally {
        // close the file.
        try {
            fis.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}



public static void save(File file, String[] data)
{
    FileOutputStream fos = null;

    try
    {
        fos = new FileOutputStream(file, true);
    }
    catch (FileNotFoundException e) {e.printStackTrace();}
    try
    {
        try
        {
            BufferedReader br = new BufferedReader(new FileReader(file));
            if (br.readLine() != null) {
                fos.write("\n".getBytes());
            }
            for (int i = 0; i<data.length; i++)
            {

                fos.write(data[i].getBytes());
                if (i < data.length-1)
                {
                    fos.write("\n".getBytes());
                }

            }
        }
        catch (IOException e) {e.printStackTrace();}
    }
    finally
    {
        try
        {
            fos.close();
        }
        catch (IOException e) {e.printStackTrace();}
    }
}


public void clear(){
    name2 = null;
    color2 = null;
    x2 = null;
    y2 = null;
    xsec = 0;
    ysec = 0;
    descriptor2 = null;
    desc2 = null;

}

编写元素的类:

public class ObjectRep implements Serializable {

private static final long serialVersionUID = 1L;
public static String name;
public static String color;
private byte []descriptors;
private int cols;
private int rows;
private int elemSize;
private int MatType;
public static float x;
public static float y;
Mat desc;




public ObjectRep(String name,String color, Mat desc, float x, float y){
    this.name=name;
    this.desc = desc;
    MatToBytes(desc);
    this.color=color;
    this.x = x;
    this.y = y;
}



public Byte MatToBytes(Mat data){
    cols=data.cols();
    rows=data.rows();
    elemSize=(int)data.elemSize();
    MatType=data.type();
    descriptors=new byte[(int)(data.total()*data.elemSize())]; // elemSize is in bytes
    data.get(rows, cols, descriptors);
    return null;            //??
}


public  Mat bytesToMat(){
    if(descriptors!=null){
        Mat desc = new Mat(rows, cols, MatType);
        desc.put(0, 0, descriptors);
        return desc;
    }else return null;
}

保存.csv:

table black /storage/emulated/0/Pictures/picFolder/table_black.jpg 700.0 435.0 blabla blabla /storage/emulated/0/Pictures/picFolder/blabla_blabla.jpg 117.0 348.0 somesome somesome /storage/emulated/0/Pictures/picFolder/somesome_somesome.jpg 641.0 298.0 nanana nanana /storage/emulated/0/Pictures/picFolder/nanana_nanana.jpg 129.0 392.0 something something /storage/emulated/0/Pictures/picFolder/something_something.jpg 299.0 504.0 laptop white /storage/emulated/0/Pictures/picFolder/laptop_white.jpg 404.0 572.0

然后我有了新的 check.csv，它看起来像这样:

laptop white /storage/emulated/0/Pictures/picFolder/laptop_white.jpg 404.0 572.0 laptop white /storage/emulated/0/Pictures/picFolder/laptop_white.jpg 404.0 572.0 laptop white /storage/emulated/0/Pictures/picFolder/laptop_white.jpg 404.0 572.0 laptop white /storage/emulated/0/Pictures/picFolder/laptop_white.jpg 404.0 572.0 laptop white /storage/emulated/0/Pictures/picFolder/laptop_white.jpg 404.0 572.0

感谢您的帮助

Answer 1

你的问题在这里

} else if (j == 5) {

...

objectTab[numer] = new ObjectRep(name2, color2, desc2, xsec, ysec);

...

当您读取文件时，您只会在 j = 5 时加载 objectTab。