private dispatchTouchEvent？

Question

我有一個名爲dot的類，並且該應用程序運行時會創建該同一類的許多實例。問題是我需要能夠點擊這個類的其中一個實例，並且點擊的實例只能改變顏色。

問題是每當我點擊其中一個點實例時，它們都會改變顏色，而不是我點擊的顏色。

下面的代碼：

package com.ewebapps; 
import android.content.Context; 
import android.graphics.Canvas; 
import android.graphics.Paint; 
import android.view.MotionEvent; 
import android.view.View; 

public class Dot extends View { 
    private final float x; 
    private final float y; 
    private final int r; 
    private final Paint mBlack = new Paint(Paint.ANTI_ALIAS_FLAG); 
    private final Paint mWhite = new Paint(Paint.ANTI_ALIAS_FLAG); 
    private final Paint mGreen = new Paint(Paint.ANTI_ALIAS_FLAG); 
    private boolean touched; 

    public Dot(Context context, float x, float y, int r) { 
     super(context); 
     mBlack.setColor(0xFF000000); //Black 
     mWhite.setColor(0xFFFFFFFF); //White 
     mGreen.setColor(0xFF00FF00); //Green 
     this.x = x; 
     this.y = y; 
     this.r = r; 
    } 

    @Override 
    public boolean dispatchTouchEvent(MotionEvent event) { // On touch. 
     touched = true; 
     //mPaint.setColor(0xFF00FF00); // Turn dot green. 
     this.invalidate(); 
     return super.dispatchTouchEvent(event); 
    } 

    @Override 
    protected void onDraw(Canvas canvas) { 
     super.onDraw(canvas); 
     canvas.drawCircle(x, y, r+2, mWhite); //White stroke. 

     if(!touched) 
     { 
      canvas.drawCircle(x, y, r, mBlack); //Black circle. 
     } 
     else 
     { 
      canvas.drawCircle(x, y, r, mGreen); //Green circle. 
     } 
    } 

} 

Answer 1

我們不知道你是如何聲明或打電話或創建這些意見，所以我們不知道怎麼幫你。

我唯一能說的事情是，dispatchTouchEvent是不一樣的事情的onTouchEvent

看起來dispatchTouchEvent被稱爲每當有屏幕上的任何觸摸事件，而不是你。因此，您的所有觀看都會收到觸摸事件，然後設置爲true。

Called to process touch screen events. You can override this to intercept all touch screen events before they are dispatched to the window. Be sure to call this implementation for touch screen events that should be handled normally.