这是我的第一个问题!希望你能帮到我!
我解释:
我正在尝试在安卓工作室中开发一个像 paint 这样的应用程序来与 Paint、Canvas 和这个类一起工作......
我有一个班级叫.java连佐;这是我类的代码:
package com.example.pedro.paint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.graphics.Path;
/**
* Created by Pedro on 26/02/2018.
*/
public class Lienzo extends View {
//PATH TO DRAW THE LINES
private Path drawPath;
//PAINT DRAWING AND PAINT CANVAS
private Paint drawPaint,canvasPaint;
//COLOR INITIAL
private int paintColor=0xFFFF0000;
//CANVAS
private Canvas drawCanvas;
//CANVAS TO SAVE
private Bitmap canvasBitmap;
public Lienzo(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
setupDrawing();
}
private void setupDrawing(){
//CONFIGURATION AREA TO DRAW
drawPath = new Path();
drawPaint=new Paint();
drawPaint.setColor(paintColor);
drawPaint.setAntiAlias(true);
drawPaint.setStrokeWidth(20);
drawPaint.setStyle(Paint.Style.STROKE);
drawPaint.setStrokeJoin(Paint.Join.ROUND);
drawPaint.setStrokeCap(Paint.Cap.ROUND);
canvasPaint= new Paint(Paint.DITHER_FLAG);
}
//ASIGN SIZE TO VIEW
@Override
protected void onSizeChanged(int w, int h,int oldw, int oldh){
super.onSizeChanged(w,h,oldw,oldh);
canvasBitmap=Bitmap.createBitmap(w,h,Bitmap.Config.ARGB_8888);
drawCanvas=new Canvas(canvasBitmap);
}
//PAINT THE VIEW.CALL BY ONTHOUCHEVENT
@Override
protected void onDraw(Canvas canvas){
canvas.drawBitmap(canvasBitmap,0,0,canvasPaint);
canvas.drawPath(drawPath,drawPaint);
}
//REGISTER USER TOUCH
public boolean OnTouchEvent(MotionEvent event)
{
float touchX =event.getX();
float touchY=event.getY();
switch (event.getAction())
{
case MotionEvent.ACTION_DOWN:
drawPath.moveTo(touchX,touchY);
break;
case MotionEvent.ACTION_MOVE:
drawPath.lineTo(touchX,touchY);
break;
case MotionEvent.ACTION_UP:
drawPath.lineTo(touchX,touchY);
drawCanvas.drawPath(drawPath,drawPaint);
drawPath.reset();
break;
default:
return false;
}
//REPAINT
invalidate();
return true;
}
}
我没有错误,但我尝试绘画但什么也不做。这是一个示例的副本。原始 https://www.youtube.com/watch?v=GAr_agEokr8 有效,但我的代码,它等于并且不起作用。有人知道为什么吗?
谢谢和问候!
OnTouchEvent
更改为onTouchEvent
并添加@Override