有时候我们拿到一张背景图片,客户要求点击图片的不同区域去跳转或者实现不同的操作事件。我们首先要确认图片的点击区域,往往我们会在布局文件那里下手,但是这样不好做适配,所以我实现了以下方法,基本功能可以实现,而且也做好了适配,可以参考一下。
1.找到对应区域的像素点。图片中需要点击的区域是圆,所以只要找到圆心和测量出半径即可(介绍一款图片软件Mark Man),由于得到的是PX,所以要转换为dip(dp=px/2);
arrays.xml
- man_hair
- man_eye
- man_mouth
- man_throat
- man_mind
- man_ear
- man_nose
- hair
- 头发
- eye
- 眼
- mouth
- 口腔
- throat
- 咽喉
- mind
- 头/脑
- ear
- 耳朵
- nose
- 鼻
- 30
- 46
- 20
- 30
- 103
- 20
- 30
- 160
- 20
- 30
- 220
- 20
- 289
- 44
- 20
- 289
- 105
- 20
- 289
- 162
- 20
2.实现自定义ImageView控件,用来存放图片。
BaseBodyView.java
/** * 类说明:身体区域 * array必存三个点 圆中心坐标 x,y 半径 r * Author: gaobaiq * Date: 2016/7/23 11:22 */public abstract class BaseBodyView extends ImageView { protected Context mContext; // 保存所有点击区域 private MapmBodyArea ; // 保存点击的区域 private Set mFocus; protected Paint paint = new Paint(); // 点击时Path区域的转换,用于触摸点的判断 protected RectF mPathRectF = new RectF(); protected OnBodyClickListener mBodyClick; public BaseBodyView(Context context) { this(context, null); } public BaseBodyView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public BaseBodyView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); mContext = context; initDatas(); } private void initDatas() { mBodyArea = new HashMap<>(); mFocus = new HashSet<>(); //paint.setStyle(Paint.Style.FILL); //paint.setARGB(170, 0, 205, 0); initBodyArea(); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); // 进行触摸区域绘制 //for(String key : mFocus) { // Path path = mBodyArea.get(key).getPath(); // canvas.drawPath(path, paint); //} } @Override public boolean onTouchEvent(MotionEvent event) { if (mBodyClick != null) { checkAreas(event); if(!mFocus.isEmpty()) { BodyArea area = null; for(String key : mFocus){ area = mBodyArea.get(key); //invalidate(); // 渲染选中区域颜色 mBodyClick.onBodyClick(0, area.getPtKeys()); } } } return super.onTouchEvent(event); } private void checkAreas(MotionEvent event) { mFocus.clear(); for(String key : mBodyArea.keySet()) { mPathRectF.setEmpty(); Path path = mBodyArea.get(key).getPath(); path.computeBounds(mPathRectF, true); if(mPathRectF.contains(event.getX(),event.getY())) { mFocus.add(key); break; } } } public void initBodyArea() { mBodyArea.clear(); mFocus.clear(); String[] keys = mContext.getResources().getStringArray(initArray()); BodyArea bodyArea = null; int idenId = -1; if(keys != null) { for(String key : keys) { idenId = mContext.getResources().getIdentifier(key, "array", initPackage()); int[] paths = mContext.getResources().getIntArray(idenId); idenId = mContext.getResources().getIdentifier(key + "_code", "array", initPackage()); String[] ptKeys = mContext.getResources().getStringArray(idenId); bodyArea = new BodyArea(ptKeys, paths); mBodyArea.put(key, bodyArea); } } } /** * 进行不同材质机器的兼容 * */ private float toDip(Context context,float pxValue){ final float scale = context.getResources().getDisplayMetrics().density; return (int) (pxValue * scale + 0.5f); } protected abstract int initArray(); protected abstract String initPackage(); /** * 点击事件抽象方法 */ public void setOnBodyClickListener(OnBodyClickListener listener) { this.mBodyClick = listener; } public interface OnBodyClickListener { void onBodyClick(int position, String[] keys); } /** * 圆形区域对象 * */ class BodyArea { private String[] mPtKeys; private Path mPath; public BodyArea(String[] ptKeys, int[] paths) { super(); this.mPtKeys = ptKeys; mPath = new Path(); int len = paths.length; if (len >= 3) { mPath.addCircle(toDip(mContext, paths[0]), toDip(mContext, paths[1]), toDip(mContext, paths[2]), Path.Direction.CW); } mPath.close(); } public String[] getPtKeys() { return mPtKeys; } public void setPtKeys(String[] ptKeys) { this.mPtKeys = ptKeys; } public Path getPath() { return mPath; } }}
ManHeadView.java
/** * 类说明:男头部图片区域点击 * 自定义控件命名要与array的一样 * Author: gaobaiq * Date: 2016/7/22 10:00 */public class ManHeadView extends BaseBodyView { public ManHeadView(Context context) { this(context, null); } public ManHeadView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public ManHeadView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } @Override protected int initArray() { return R.array.man_head; } @Override protected String initPackage() { return mContext.getPackageName(); }}
3.布局(切记android:scaleType="matrix")
4.实现方法
mImgHead.setOnBodyClickListener(new ManHeadView.OnBodyClickListener() { @Override public void onBodyClick(int position, String[] keys) { String message ="Code:" + keys[0] + ", Name:" + keys[1]; ToastUtils.ToastMessage(getActivity(), message); }});