Android(安卓)开发自定义使用svg构造交互式中国（各国）地图

自定义开发是android的必不可少的技能之一，要熟练的掌握，需要大家不断的学习，写代码才能日积月累。好了，废话不多说了；看下面的步骤：

1，用的到的两个地址https://www.amcharts.com/svg-maps/?map=china （需要下载国家的svg）

http://inloop.github.io/svg2android/ 下载后需要把svg文件在该地址中解析为Android可识别的代码

2，打开android studio—— res文件下，新建一个raw文件夹，然后把vsg文件复制粘贴到raw文件中，以下图是放入后的效果

3，在java中创建Java类继承View ，实现该类的构成函数，如下代码：

public class ChinaMapView extends View {    private Paint mPaint;    private Context context;    private int[] colors = new int[]{Color.RED, Color.GREEN, Color.YELLOW, Color.GREEN};    private ArrayList itemList = new ArrayList<>();    private ProvinceBean selectItem;    private GestureDetectorCompat gestureDetectorCompat;    public ChinaMapView(Context context, AttributeSet attrs) {        super(context, attrs);        init(context);    }    private void init(Context context) {        //准备画笔        mPaint = new Paint();        mPaint.setAntiAlias(true);        this.context = context;        thread.start();        //手势处理类        gestureDetectorCompat = new GestureDetectorCompat(context, new GestureDetector.SimpleOnGestureListener() {            @Override            public boolean onDown(MotionEvent e) {                Log.d("event   ", e.getAction() + "");                handlerTouch(e.getX(), e.getY());                return true;            }        });    }    private void handlerTouch(float x, float y) {        if (itemList != null) {            for (ProvinceBean item : itemList) {                if (item.isTouch((int) (x / 1.4), (int) (y / 1.4))) {                    selectItem = item;                    postInvalidate();                    break;                }            }        }    }    public ChinaMapView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    @Override    public boolean onTouchEvent(MotionEvent event) {        return gestureDetectorCompat.onTouchEvent(event);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        canvas.save();        canvas.scale(1.4f, 1.4f);        for (int i = 0; i < itemList.size(); i++) {            if (selectItem != itemList.get(i)) {                itemList.get(i).draw(mPaint, canvas, false);            }        }        if (selectItem != null) {            selectItem.draw(mPaint, canvas, true);        }        canvas.restore();    }    Handler handler = new Handler() {        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            if (msg != null) {                postInvalidate();            }        }    };    Thread thread = new Thread() {        @Override        public void run() {            //dom解析xml            InputStream inputStream = context.getResources().openRawResource(R.raw.chinahigh);            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();            DocumentBuilder builder = null;            try {                builder = factory.newDocumentBuilder();                Document document = builder.parse(inputStream);//解析输入流                Element rootElement = document.getDocumentElement();                NodeList items = rootElement.getElementsByTagName("path");                Log.d("MyMapView:", "集合大小=" + items.getLength());                for (int i = 0; i < items.getLength(); i++) {                    int colorsIndex = i % 4;                    Element element = (Element) items.item(i);                    String pathData = element.getAttribute("android:pathData");                    @SuppressLint("RestrictedApi") Path path = PathParser.createPathFromPathData(pathData);                    ProvinceBean provinceBean = new ProvinceBean(path);                    provinceBean.setColor(colors[colorsIndex]);                    itemList.add(provinceBean);                }                handler.sendEmptyMessage(1);            } catch (Exception e) {                e.printStackTrace();            }        }    };}class ProvinceBean {    private Path path;    private int color;    public ProvinceBean(Path path) {        this.path = path;    }    public int getColor() {        return color;    }    public void setColor(int color) {        this.color = color;    }    /**     * 绘制省份     *     * @param paint     * @param canvas     * @param isSelected 是否被选中     */    public void draw(Paint paint, Canvas canvas, boolean isSelected) {        if (isSelected) {            //绘制点击后的背景            paint.setStrokeWidth(2);            paint.setColor(color);            paint.setStyle(Paint.Style.FILL);            //添加阴影            paint.setShadowLayer(8, 0, 0, Color.BLACK);            canvas.drawPath(path, paint);            //绘制背景            paint.clearShadowLayer();            paint.setStrokeWidth(2);            paint.setColor(color);            paint.setStyle(Paint.Style.FILL);            canvas.drawPath(path, paint);        } else {            //绘制背景            paint.setStrokeWidth(2);            paint.clearShadowLayer();            paint.setColor(color);            paint.setStyle(Paint.Style.FILL);            canvas.drawPath(path, paint);            //绘制边界线            paint.setStrokeWidth(1);            paint.setColor(Color.GRAY);            paint.setStyle(Paint.Style.STROKE);            canvas.drawPath(path, paint);        }    }    //触摸点是否在这个省的path内    public boolean isTouch(int x, int y) {        //构造一个矩形对象        RectF rectF = new RectF();        //返回路径控制点的计算边界保存到rectF        path.computeBounds(rectF, true);        //构造一个区域对象        Region region = new Region();        //给区赋值        region.setPath(path, new Region((int) rectF.left, (int) rectF.top, (int) rectF.right, (int) rectF.bottom));        return region.contains(x, y);    }}

4，在主类中调用该自定义的类：

需要注意的一些坑：

1.2、添加compile 'com.android.support:appcompat-v7:25.3.1' //需要是23.2 版本以上的1.3、Activity需要继承与AppCompatActivity1.4、布局文件当中添加    xmlns:app="http://schemas.android.com/apk/res-auto"2、使用在Actvity前面添加一个flag设置        static {        AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);    }2.1 ImageView/ImageButton    XML app:srcCompat    代码里面使用无区别2.2 Button 不支持app:srcCompat    Xml 使用在Button的selector2.3 RadioButton 直接使用2.4 textview的drawable  直接使用2.5 使用的动态Vector Drawable    主要是不能直接修改 pathData    不能使用自定义interpolator

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