Android 画布画线,android实现一个简单的画布，可以用手指画线条。

满意答案

wpdhc

2016.07.05

采纳率：49%    等级：7

已帮助：359人

public class DrawView extends View {

Context mycontext;

int toasttime = 1000*60;

boolean enabletoast = true;

//之前的坐标

float preX;

float preY;

//路径

private Path path;

//画笔

public Paint paint = null;

//默认画布大小

public static int VIEW_WIDTH = 500;

public static int VIEW_HEIGHT = 600;

//

Bitmap cacheBitmap = null;

//

Canvas cacheCanvas = null;

public DrawView(Context context, AttributeSet set) {

super(context, set);

mycontext = context;

cacheBitmap = Bitmap.createBitmap(VIEW_WIDTH, VIEW_HEIGHT,

Config.ARGB_8888);

cacheCanvas = new Canvas();

path = new Path();

cacheCanvas.setBitmap(cacheBitmap);

paint = new Paint(Paint.DITHER_FLAG);

paint.setColor(Color.WHITE);

paint.setStyle(Paint.Style.STROKE);

paint.setStrokeWidth(1);

paint.setAntiAlias(true);

paint.setDither(true);

}

@Override

public boolean onTouchEvent(MotionEvent event) {

float x = event.getX();

float y = event.getY();

switch (event.getAction()) {

case MotionEvent.ACTION_DOWN:

path.moveTo(x, y);

preX = x;

preY = y;

break;

case MotionEvent.ACTION_MOVE:

path.quadTo(preX, preY, x, y);

preX = x;

preY = y;

break;

case MotionEvent.ACTION_UP:

cacheCanvas.drawPath(path, paint);

path.reset();

if(enabletoast == false){

}

break;

}

invalidate();

return true;

}

@Override

protected void onDraw(Canvas canvas) {

super.onDraw(canvas);

Paint bmpPaint = new Paint();

canvas.drawBitmap(cacheBitmap, 0, 0, bmpPaint);

canvas.drawPath(path, paint);

}

}

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