如何在屏幕上得到触摸位置(Android) [英] How to get Touch Location on Screen (Android)

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本文介绍了如何在屏幕上得到触摸位置(Android)的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我正在开发中的Andr​​oid游戏,在那场比赛我使用的画布显示圈(5 * 6)网格。 我要检查触摸区域的位置。例如,如果我触摸/点击屏幕上的左右两个相邻的圈,它应该返回位置,或者如果可能的话,应该显示这些界的行。对于我用这个onTouchEvent()方法。但我没有得到我的设备屏幕上的任何输出。我检查#2有给有方法,但它并不能帮助我,这里是链接(的如何在Android的触摸位置?)。我请你,请检查该code和建议的解决方案。这里是code文件:

 包com.example.tap;进口android.os.Bundle;
进口android.annotation.Sup pressLint;
进口android.app.Activity;
进口android.content.Context;
进口android.gesture.Gesture;
进口android.graphics.Bitmap;
进口android.graphics.Bitmap.Config;
进口android.graphics.BitmapFactory;
进口android.graphics.Canvas;
进口android.graphics.Paint;
进口android.util.Log;
进口android.view.Menu;
进口android.view.MotionEvent;
进口android.view.View;公共类MainActivity延伸活动{    @覆盖
    保护无效的onCreate(捆绑savedInstanceState){
        super.onCreate(savedInstanceState);
        的setContentView(新板(本));
    }    公共类板扩展视图
    {
        涂料pBack =新的油漆();
        涂料PDOT =新的油漆();
        INT XPOS = 0;
        INT ypos = 0;        INT COLS = 5;
        INT行= 6;        公板(上下文的背景下)
        {
            超级(上下文);
            pBack.setARGB(255,15,102,0);
            pDot.setARGB(255,255,255,255);
        }        @燮pressLint(DrawAllocation)
        保护无效的onDraw(帆布油画)
        {
            super.onDraw(画布);
            canvas.drawPaint(pBack);
            浮XSTEP = canvas.getWidth()/(COLS + 1);
            浮yStep = canvas.getHeight()/(行+ 1);
            浮curCirclXpos,curCirclYpos,lastCirclXpos = 0,lastCirclYpos = 0;
            //浮动垂直=
//布尔中的onTap(手势克,点P)
// {
//
//}            对于(INT Y = 0; Y<行; Y ++)
            {
                为(中间体X = 0; X&下; C​​OLS; X ++)
                {
                    canvas.drawCircle((X + 1)* XSTEP,(Y + 1)* yStep,20,PDOT);
                    curCirclXpos = X;
                    curCirclYpos = Y;                    如果(Y == 0)
                    {
                        //canvas.drawLine((x + 1)* XSTEP,yStep,(X + 1)* XSTEP,行* yStep,PDOT);
                        //canvas.drawLine(xpos,ypos,XPOS,yStep,PDOT);
                        canvas.drawLine(curCirclXpos,curCirclYpos,lastCirclXpos,lastCirclYpos,PDOT);
                    }
                }                //canvas.drawLine(xStep,(Y + 1)* yStep,COLS * XSTEP,(Y + 1)* yStep,PDOT);
            }
        }
        公共布尔onTouchEvent(MotionEvent五)
        {
            XPOS =(int)的e.getX();
           ypos =(int)的e.getY();
            开关(e.getAction())
            {
            案例MotionEvent.ACTION_DOWN:
            案例MotionEvent.ACTION_UP:
            案例MotionEvent.ACTION_MOVE:
                //Log.d(\"Umar\",String.valueOf(xpos));
                //Log.d(\"Farooq\",String.valueOf(ypos));            打破;            }
            返回false;
        }
    }
    @覆盖
    公共布尔onCreateOptionsMenu(菜单菜单){        。getMenuInflater()膨胀(R.menu.main,菜单);
        返回true;
    }
}


解决方案

 公共布尔onTouchEvent(MotionEvent五)
        {
            INT XPOS =(int)的e.getX();
            INT ypos =(int)的e.getY();
            开关(e.getAction())
            {
            案例MotionEvent.ACTION_DOWN:
             Log.d(调试,在触摸(下)+将String.valueOf(XPOS)+将String.valueOf(ypos));
            案例MotionEvent.ACTION_UP:
            Log.d(调试,在触摸(上)+将String.valueOf(XPOS)+将String.valueOf(ypos));
            案例MotionEvent.ACTION_MOVE:
            Log.d(调试,在触摸(移动)+将String.valueOf(XPOS)+将String.valueOf(ypos));
            打破;
        }
        返回true;    }

然后重写绘制方法

  @覆盖
  公共无效画(油画画布){
   super.draw(画布);
   }

所以,你尝试

canvas.drawLine(startx的,startY,stopX,stopY,油漆);

为了使线直线上涨试试

  canvas.drawLine(XPOS,ypos,XPOS,的getHeight(),新的油漆());

获取的高度应该是你的屏幕的高度(因为你的画线直线上升)

有关这个变量XPOS和ypos应该是提供给所有方法,这样添加

  INT XPOS,ypos = 0;

要你的code的顶部(但在类声明中)

有关圆之间慢吞吞一个你需要得到第一个圆圈的x,触摸y位置,然后与他们设置的drawLine方法,所以是这样的:

  currentCircleXpos,lastCircleXpos = 0; //你将在的onDraw方法时圆获取的绘制设置这些。
currentCircleYpos,lastCircleypos = 0;
canvas.drawLine(currentCircleXpos,currentCircleYpos,lastCircleXpos,lastCircleYpos,新的油漆());

的OnDraw()
方法-------

 的for(int y = 0; Y<行; Y ++)
    {
        为(中间体X = 0; X&下; C​​OLS; X ++)
        {
            canvas.drawCircle((X + 1)* XSTEP,(Y + 1)* yStep,20,PDOT);
             currentCircleXpos = X;
              currentCircleYpos = Y; //获取正在绘制圆的位置
        如果(Y == 0)
        {
            //canvas.drawLine((x + 1)* XSTEP,yStep,(X + 1)* XSTEP,行* yStep,PDOT);
        }
    }    //canvas.drawLine(xStep,(Y + 1)* yStep,COLS * XSTEP,(Y + 1)* yStep,PDOT);
}

I am developing game in android, in that game I am using canvas to show grid(5*6) of circles. I want to check location of Touch area. For Example if I touch/Tap on screen around two adjacent circles it should return location or if possible it should display line between those circles. For that I used this onTouchEvent() method. But I am not getting any output on my device's screen. I have checked on Stackoverflow there was method given there but it doesn't help me, here is the link(How to get the Touch position in android?). I request you to please check this code and suggest solution. Here is the code file:

   package com.example.tap;

import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.gesture.Gesture;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.Log;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(new board(this));
    }

    public class board extends View
    {
        Paint pBack = new Paint();
        Paint pDot  = new Paint();
        int xpos=0;
        int ypos=0;

        int cols = 5;
        int rows = 6;

        public board(Context context)
        {
            super(context);
            pBack.setARGB(255, 15, 102, 0);
            pDot.setARGB(255, 255, 255, 255);
        }

        @SuppressLint("DrawAllocation")
        protected void onDraw(Canvas canvas)
        {
            super.onDraw(canvas);
            canvas.drawPaint(pBack);
            float xStep = canvas.getWidth() / (cols + 1);
            float yStep = canvas.getHeight() / (rows + 1);
            float curCirclXpos, curCirclYpos, lastCirclXpos = 0, lastCirclYpos =0;
            //float vertical= 
//          boolean onTap(Gesture g, Point p)
//          {
//              
//          }

            for (int y = 0; y < rows; y++)
            {
                for (int x = 0; x < cols; x++)
                {
                    canvas.drawCircle((x + 1) * xStep, (y + 1) * yStep, 20, pDot);
                    curCirclXpos=x;
                    curCirclYpos=y;

                    if (y == 0)
                    {
                        //canvas.drawLine((x + 1) * xStep, yStep, (x + 1) * xStep, rows * yStep, pDot);
                        //canvas.drawLine(xpos, ypos, xpos, yStep, pDot);
                        canvas.drawLine(curCirclXpos, curCirclYpos, lastCirclXpos, lastCirclYpos, pDot);
                    }                   
                }

                //canvas.drawLine(xStep, (y + 1) * yStep, cols * xStep, (y + 1) * yStep, pDot);
            }
        }
        public boolean onTouchEvent(MotionEvent e)
        {
            xpos=(int) e.getX();
           ypos=(int) e.getY();
            switch (e.getAction())
            {
            case MotionEvent.ACTION_DOWN:
            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_MOVE:
                //Log.d("Umar",String.valueOf(xpos));
                //Log.d("Farooq",String.valueOf(ypos));

            break;

            }
            return false;


        }
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }


}

解决方案

public boolean onTouchEvent(MotionEvent e)
        {
            int xpos=(int) e.getX();
            int ypos=(int) e.getY();
            switch (e.getAction())
            {
            case MotionEvent.ACTION_DOWN:
             Log.d("DEBUG", "On touch (down)" + String.valueOf(xpos) + String.valueOf(ypos));
            case MotionEvent.ACTION_UP:
            Log.d("DEBUG", "On touch (up)" + String.valueOf(xpos) + String.valueOf(ypos));
            case MotionEvent.ACTION_MOVE:
            Log.d("DEBUG", "On touch (move)" + String.valueOf(xpos) + String.valueOf(ypos));
            break;
        }
        return true;

    }

Then override the draw method

 @Override
  public void draw(Canvas canvas) {
   super.draw(canvas);
   }

So you try

canvas.drawLine(startX, startY, stopX, stopY, paint);

To make a line go straight up try

canvas.drawLine(xpos, ypos, xpos, getHeight() , new Paint());

Get height should be your screen's height (Since your drawing a line straight up)

For this the variables xpos and ypos should be available to all methods so add

int xpos,ypos = 0; 

To the the top of your code (but within the class declaration)

For drawling a between the circles you would need to get the first circles x,y position on touch then set the drawLine method with them, so something like:

currentCircleXpos, lastCircleXpos = 0; //you would set these in the onDraw method when the circle get's drawn.
currentCircleYpos, lastCircleypos = 0;


canvas.drawLine(currentCircleXpos, currentCircleYpos, lastCircleXpos, lastCircleYpos , new Paint());

OnDraw() method-------

 for (int y = 0; y < rows; y++)
    {
        for (int x = 0; x < cols; x++)
        {
            canvas.drawCircle((x + 1) * xStep, (y + 1) * yStep, 20, pDot);
             currentCircleXpos = x;
              currentCircleYpos = y; //gets the circle that is being drawn's location
        if (y == 0)
        {
            //canvas.drawLine((x + 1) * xStep, yStep, (x + 1) * xStep, rows * yStep, pDot);
        }                   
    }

    //canvas.drawLine(xStep, (y + 1) * yStep, cols * xStep, (y + 1) * yStep, pDot);
}

这篇关于如何在屏幕上得到触摸位置(Android)的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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