在android中的图像边界onTouch内填充绘画

Question

我正在x，y点上从drawable和drawing paint创建自定义视图和位图。我能画画，但它超出界限。

这是我的代码。

package com.example.finalpaint;

import java.util.ArrayList;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;

public class CustomView extends View implements OnTouchListener {
    private Canvas mCanvas;
    private Path mPath;
    public Paint mPaint;
    private ArrayList<Path> paths = new ArrayList<Path>();
    Bitmap bmp;

    public CustomView(Context context) {
        super(context);
        setFocusable(true);
        setFocusableInTouchMode(true);

        setOnTouchListener((OnTouchListener) this);
       setBackgroundColor(Color.GRAY);
       // setDrawingCacheEnabled(true);
        bmp = BitmapFactory.decodeResource(getResources(), R.drawable.human_body_front);
        mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setDither(true);
        mPaint.setColor(Color.BLUE);
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setStrokeJoin(Paint.Join.ROUND);
        mPaint.setStrokeCap(Paint.Cap.ROUND);
        mPaint.setStrokeWidth(30);
        mCanvas = new Canvas();
        mPath = new Path();
        paths.add(mPath);

    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        canvas.drawBitmap(bmp, 0, 0, mPaint);
        for (Path p : paths) {
            canvas.drawPath(p, mPaint);
        }
    }

    private float mX, mY;
    private static final float TOUCH_TOLERANCE = 0;
    //Draw dw = new Draw();

    private void touch_start(float x, float y) {
        mPath.reset();
        mPath.moveTo(x, y);
        mX = x;
        mY = y;

    }

    private void touch_move(float x, float y) {
        float dx = Math.abs(x - mX);
        float dy = Math.abs(y - mY);
        if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
            mPath.quadTo(mX, mY, (x + mX) / 2, (y + mY) / 2);
            mX = x;
            mY = y;
        }

    }

    private void touch_up() {
        mPath.lineTo(mX, mY);
        // commit the path to our offscreen
        mCanvas.drawPath(mPath, mPaint);
        // kill this so we don't double draw
        mPath = new Path();
        paths.add(mPath);
    }

    @Override
    public boolean onTouch(View arg0, MotionEvent event) {
        float x = event.getX();
        float y = event.getY();
        if ((int) event.getX() < 1)
            return false;
        if ((int) event.getY() < 1)
            return false;
        if ((int) event.getX() > bmp.getWidth())
            return false;
        if ((int) event.getY() > bmp.getHeight())
            return false;
        int color = bmp.getPixel((int)event.getX(), (int)event.getY());

        if(color == Color.TRANSPARENT)
            return false;
        if(color == Color.WHITE);
        switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
            touch_start(x, y);
            invalidate();
            break;
        case MotionEvent.ACTION_MOVE:
            touch_move(x, y);
            invalidate();
            break;
        case MotionEvent.ACTION_UP:
            touch_up();
            invalidate();
            break;
        }
        return true;
      }
    }

这是MainActivity，将内容视图设置为自定义视图。

package com.example.finalpaint;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main);

        CustomView view = new CustomView(this);
        setContentView(view);


    }
}

我希望在OnTouch时在边界内的图像内绘制颜色。

这是我的屏幕截图。