android实现涂鸦，保存涂鸦后的图片，清屏

自定义view的类，代码如下：
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package com.xy.tuya;

import android.annotation.SuppressLint;
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.Paint.Style;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;

public class MyView extends View {
    private Paint paint = null;
    private Bitmap originalBitmap = null;
    private Bitmap new1Bitmap = null;
    private Bitmap new2Bitmap = null;
    private float clickX = 0, clickY = 0;
    private float startX = 0, startY = 0;
    private boolean isMove = true;
    private boolean isClear = false;
    private int color = Color.GREEN;
    private float strokeWidth = 2.0f;

    public MyView(Context context, AttributeSet attrs) {
        super(context, attrs);
        originalBitmap = BitmapFactory.decodeResource(getResources(),
                R.drawable.a1).copy(Bitmap.Config.ARGB_8888, true);
        new1Bitmap = Bitmap.createBitmap(originalBitmap);
        setDrawingCacheEnabled(true);
        Log.i("RG", "new1Bitmap--->>>" + new1Bitmap);
    }

    public void clear() {
        isClear = true;
        new2Bitmap = Bitmap.createBitmap(originalBitmap);
        invalidate();
    }

    Bitmap saveImage = null;

    public Bitmap saveImage() {
        if (saveImage == null) {
            return null;
        }
        return saveImage;
    }

    public void setImge() {
        saveImage = null;
    }

    public void setstyle(float strokeWidth) {
        this.strokeWidth = strokeWidth;
    }

    Handler handler1;

    @SuppressLint("DrawAllocation")
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.drawBitmap(HandWriting(new1Bitmap), 0, 0, null);
        handler1 = new Handler() {

            @Override
            public void handleMessage(Message msg) {

                Log.i("RG", "--------------------");
                int what = msg.what;
                if (what == 2) {
                    saveImage = Bitmap.createBitmap(HandWriting(new1Bitmap));
                    Message msg1 = new Message();
                    msg1 = Message.obtain(MainActivity.hh, 3);
                    MainActivity.hh.sendMessage(msg1);
                }
                super.handleMessage(msg);
            }

        };

    }

    @SuppressLint("HandlerLeak")
    Handler handler;

    public Bitmap HandWriting(Bitmap originalBitmap) {
        handler = new Handler() {

            @Override
            public void handleMessage(Message msg) {

                int what = msg.what;
                if (what == 1) {
                    startX = clickX;
                    startY = clickY;
                }
                super.handleMessage(msg);
            }

        };
        Canvas canvas = null;

        if (isClear) {
            canvas = new Canvas(new2Bitmap);
            Log.i("RG", "canvas ");
        } else {
            canvas = new Canvas(originalBitmap);
        }
        paint = new Paint();
        paint.setStyle(Style.STROKE);
        p

补充：移动开发 , Android ,