Question

提前感谢您的帮助。我是Java和Android编程的初学者，所以我的第一个应用就是在拍照后尝试从照片中选择rgb值。但是，最后一个错误是“令牌上的语法错误”字符串“，删除此令牌”。这让我疯狂！似乎所有括号都在那里，每个语句的语法都是正确的，对于发生了什么的任何想法？我正在使用Eclipse，如果这有所不同，最新版本。这是完整的代码。问题始于评论/* SET TEXT FUNCTION TO THE FIELD USING SET TEXT METHOD*/.

package com.example.firstapp;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

public class MainActivity extends Activity { //1

    TextView pixelcord, rgbvals; 
    ImageView iv;
    Button btn;



    @Override
    public void onCreate(Bundle savedInstanceState) { //2

        /* GATHER THE INFORMATION FROM THE LAYOUT TO ORGANIZE APP*/
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        /* SET ON CLICK LISTENER TO GET CLICK REPSONSE -- LAUNCH CAMERA AND TAKE PHOTO */
        /* SET VARIABLES FOR USE FROM EACH VIEW */
        iv = (ImageView) findViewById(R.id.imageView); /* USE IMAGE VIEW FIELD*/
        pixelcord = (TextView)findViewById(R.id.pixelcord); /* USE TEXT FIELD FOR PIXEL */
        rgbvals = (TextView)findViewById(R.id.rgbvals); /* USE TEXT FIELD FOR RGB VALUES*/
        btn = (Button) findViewById(R.id.takePhoto);

        /* SET INFORMATION OF WHAT TO DO UPON EACH CLIK*/
        iv.setOnTouchListener(imgSourceOnTouchListener);

/* =====================================CAMERA BUTTON=====================================*/        
        btn.setOnClickListener(new OnClickListener() { //3

            @Override

            public void onClick(View v) { //4

                Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
                startActivityForResult(intent, 0);

            } //*4


        }); //*3
/* =======================================================================================*/        


        } /* END OF ON CREATE*/ //*2

    /* DECLARATION OF IMG TOUCH FUNCTION*/

    OnTouchListener imgSourceOnTouchListener = new OnTouchListener() { //5

        @Override

        public boolean onTouch(View view, MotionEvent event) { //6


            float eventX = event.getX();
            float eventY = event.getY();
            float[] eventXY = new float[] { eventX, eventY};

            Matrix invertMatrix = new Matrix(); 
            ((ImageView)view).getImageMatrix().invert(invertMatrix);

            invertMatrix.mapPoints(eventXY); 
            int x = Integer.valueOf((int)eventXY[0]); /* POTENTIALLY REDUNDANT*/
            int y = Integer.valueOf((int)eventXY[1]);


            /* SET TEXT FUNCTION TO THE FIELD USING SET TEXT METHOD*/
            pixelcord.setText("X:" String.valueOf(eventX) + "/ Y:" String.valueOf(eventY) ); 


            int touchedRGB = iv.getDrawingCache().getPixel(x,y);

            rgbvals.setText("Color Value" + "#" + Integer.toHexString(touchedRGB));
            rgbvals.setTextColor(touchedRGB);

            return true;

        } //*6


    }; //*5

    @Override

    protected void onActivityResult( int requestCode, int resultCode, Intent data)
    { //7
        if(requestCode == 0)
        { //8
            Bitmap theImage = (Bitmap) data.getExtras().get("data");
            iv.setImageBitmap(theImage);

        } //*8
    } //*7


} //*1

Answer 1

您缺少几个+（连接）运算符。你可能还想在“X：”之后加一个空格使它成为“X：”，以便打印得很好。

您的代码应为：

pixelcord.setText("X: " + String.valueOf(eventX) + "/ Y: " + String.valueOf(eventY) );

而不是：

pixelcord.setText("X:" String.valueOf(eventX) + "/ Y:" String.valueOf(eventY) );

此外，您不需要String.valueOf(...)函数，因为Java会很乐意将float转换为String。所以你的代码可以简单地是：

pixelcord.setText("X: " + eventX + "/ Y: " + eventY );

Answer 2

你需要更多的“+”：

pixelcord.setText("X:" + String.valueOf(eventX) + "/ Y:" + String.valueOf(eventY) );

Answer 3

pixelcord.setText("X:" String.valueOf(eventX) + "/ Y:" String.valueOf(eventY) );

应该是

pixelcord.setText("X:"+ String.valueOf(eventX) + "/ Y:"+ String.valueOf(eventY) );

Answer 4

缺少+

用

替换行

pixelcord.setText（“X：”+ String.valueOf（eventX）+“/ Y：”+ String.valueOf（eventY））;

Answer 5

setText（）方法需要String。因此，您只能使用字符串值，对于此问题，您必须使用+符号

进行连接

pixelcord.setText("X:"+ String.valueOf(eventX) + "/ Y:"+ String.valueOf(eventY) );

令牌错误在令牌“字符串”上，删除此令牌

5 个答案: