三大自定义控件

1. 组合控件  (组合两种已有的控件得来的自定义控件 通常继承自布局)

//public class PuzzleSumView extends RelativeLayout implements View.OnClickListener {////    private Context mContext;//    private TextView mBackText;//    private  TextView mFontText;//////    public PuzzleSumView(Context context) {//        this(context,null);//    }////    public PuzzleSumView(Context context, AttributeSet attrs) {//        super(context, attrs);//        this.mContext=context;//        init();////    }////    @Override//    public void onClick(View v) {////    }////    private void init() {//        initView();//        initData();//        initEvent();//    }////    private void initData() {//    }////    private void initView() {//        View view= LayoutInflater.from(mContext).inflate(R.layout.puzzle_sum_view,null);//        mBackText= (TextView) view.findViewById(R.id.puzzle_view_tv_next);//        mFontText= (TextView) view.findViewById(R.id.tv_sum);//        addView(view);//    }////    private void initEvent() {//        mBackText.setText("选图");//        mFontText.setText("0");//////    }////    public  void  setNum(int sum){//        mFontText.setText(sum+"");//        if(sum>=2){//            mBackText.setText("下一步");//        }else {//            mBackText.setText("选图");//        }//    }//}

public class SelectItem extends RelativeLayout {    public static int mImageViewHeight;    public final int mImageViewWidth;    private ImageView mImageView;    private ImageView mCheckImg;    public SelectItem(Context context) {        super(context);//        setGravity(Gravity.CENTER);        mImageView = new ImageView(context);        mImageView.setAdjustViewBounds(true);        mImageView.setScaleType(ImageView.ScaleType.CENTER_CROP);        mImageView.setPadding(DensityUtil.dip2px(context, 1), DensityUtil.dip2px(context, 1), DensityUtil.dip2px(context, 1), DensityUtil.dip2px(context, 1));        int selectPicWitdh = DensityUtil.dip2px(context, 70);        int selectPicHeight = DensityUtil.dip2px(context, 70);        LayoutParams mImageViewRLP = new LayoutParams(selectPicWitdh, selectPicHeight);        mImageViewRLP.setMargins(DensityUtil.dip2px(context, 20), 0, 0, 0);        addView(mImageView, mImageViewRLP);        //添加红色删除图标        mCheckImg = new ImageView(context);        mCheckImg.setImageResource(R.drawable.del_select_pic);        LayoutParams checkImgRLP = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);        checkImgRLP.setMargins(DensityUtil.dip2px(context, 70), DensityUtil.dip2px(context, 5), 0, 0);        mImageViewHeight = mImageView.getHeight();        mImageViewWidth = mImageView.getWidth();        addView(mCheckImg, checkImgRLP);    }    public ImageView getmImageView() {        return mImageView;    }    public ImageView getCheckImg() {        return mCheckImg;    }    public View hideView() {        mCheckImg.setVisibility(INVISIBLE);        mImageView.setVisibility(INVISIBLE);        return this;    }}

二 继承控件 (扩展已有的控件,继承自该控件) 

public class CustomTestView extends TextView {    public CustomTestView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        init();    }    public CustomTestView(Context context, AttributeSet attrs) {        super(context, attrs);        init();    }    public CustomTestView(Context context) {        super(context);        init();    }    private void init() {        Typeface tf = Typeface.createFromAsset(getContext().getAssets(),                "gotham-medium.otf");        setTypeface(tf);    }}

三  自定义控件     继承自View
 构造函数1个参数 用于代码, 2个参数用于布局文件属性需要

public class DragView extends View {    private Bitmap mBitmap = null;    private Context mContext = null;    private Rect mFrameRect = null;    private Paint mPaint = null;    private Rect mThumbnailRect = null;    public DragView(Context c) {        super(c);    }    public DragView(Context c, AttributeSet attr) {        super(c, attr);        if (mContext == null) {            mContext = c;        }        init();    }    private void drawFrame(Canvas canvas) {        if (mFrameRect == null || mPaint == null) {            return;        }        mPaint.setColor(Color.parseColor("#00fff0"));        mPaint.setAlpha(255);        canvas.drawRect(mFrameRect, mPaint);    }    private void drawThumbnail(Canvas canvas) {        if (mThumbnailRect == null || mPaint == null || mBitmap == null                || mBitmap.isRecycled()) {            return;        }        mPaint.setAlpha(127);        canvas.drawBitmap(mBitmap, null, mThumbnailRect, mPaint);    }    private void init() {        if (mPaint == null) {            mPaint = new Paint();        }        int i = mContext.getResources().getDimensionPixelSize(R.dimen.dragview_stroke_w);        mPaint.setStrokeWidth(i);        mPaint.setColor(ContextCompat.getColor(mContext, R.color.grid_collage_background));        mPaint.setAntiAlias(true);        mPaint.setStrokeCap(Paint.Cap.ROUND);        mPaint.setStrokeJoin(Paint.Join.ROUND);        mPaint.setStyle(Paint.Style.STROKE);        mPaint.setAlpha(127);    }    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        drawThumbnail(canvas);        drawFrame(canvas);    }}

public class PuzzleView extends View {    private Context context;    private Path[] path;    private Bitmap[] bitmaps;    private boolean[] bitmapsFlag;    private float[][] pathLT;    private float[][] pathOffset;    private int pathNum;    private int viewWdh, viewHgt;    private int leftMargin;    private List<ImageBean> pics;    private final static int MARGIN_HEIGHT = 100;    private List<ImageItem> coordinateSetList;    public PuzzleView(Context context) {        super(context);        this.context = context;    }    public PuzzleView(Context context, AttributeSet attributeSet) {        super(context, attributeSet);        this.context = context;        initPath();    }    public PuzzleView(Context context, AttributeSet attributeSet, int defStyle) {        super(context, attributeSet, defStyle);        this.context = context;        initPath();    }    public void setPathCoordinate(List<ImageItem> pathCoordinate) {        this.coordinateSetList = pathCoordinate;        initPath();    }    public void setPics(List<ImageBean> imageBeans) {        leftMargin = (AppUtil.getScreenWidth(context) - dp2px(320)) / 2;        viewWdh = dp2px(320);        viewHgt = dp2px(450);        pics = new ArrayList<>();        if (imageBeans != null) {            pics.addAll(imageBeans);        }        pathNum = pics.size();    }    private void initPath() {        path = new Path[pathNum];        for (int i = 0; i < pathNum; i++) {            path[i] = new Path();        }        bitmapsFlag = new boolean[pathNum];        pathLT = new float[pathNum][2];        pathOffset = new float[pathNum][2];        for (int i = 0; i < pathNum; i++) {            bitmapsFlag[i] = false;            pathLT[i][0] = 0f;            pathLT[i][1] = 0f;            pathOffset[i][0] = 0f;            pathOffset[i][1] = 0f;        }        for (int i = 0; i < pathNum; i++) {            for (int j = 0; j < coordinateSetList.get(i).getCoordinates().size(); j++) {                float x = coordinateSetList.get(i).getCoordinates().get(j).getX();                float y = coordinateSetList.get(i).getCoordinates().get(j).getY();                if (j == 0) {                    path[i].moveTo(dp2px(x), dp2px(y));                } else {                    path[i].lineTo(dp2px(x), dp2px(y));                }            }            path[i].close();        }        // get bitmap        bitmaps = new Bitmap[pathNum];        for (int i = 0; i < pathNum; i++) {            BitmapFactory.Options opt = new BitmapFactory.Options();            opt.inJustDecodeBounds = true;            BitmapFactory.decodeFile(pics.get(i).path, opt);            int bmpWdh = opt.outWidth;            int bmpHgt = opt.outHeight;            Coordinates coordinate = caculateViewSize(coordinateSetList.get(i).getCoordinates());            int size = caculateSampleSize(bmpWdh, bmpHgt, dp2px(coordinate.getX()), dp2px(coordinate.getY()));            opt.inJustDecodeBounds = false;            opt.inSampleSize = size;            bitmaps[i] = scaleImage(BitmapFactory.decodeFile(pics.get(i).path, opt), dp2px(coordinate.getX()), dp2px(coordinate.getY()));        }    }    private Coordinates caculateViewSize(List<Coordinates> list) {        float viewWidth;        float viewHeight;        viewWidth = caculateMaxCoordinateX(list) - caculateMinCoordinateX(list);        viewHeight = caculateMaxCoordinateY(list) - caculateMinCoordinateY(list);        return new Coordinates(viewWidth, viewHeight);    }    private int caculateSampleSize(int picWdh, int picHgt, int showWdh,                                   int showHgt) {        // 如果此时显示区域比图片大，直接返回        if (showWdh < picWdh && showHgt < picHgt) {            int wdhSample = picWdh / showWdh;            int hgtSample = picHgt / showHgt;            // 利用小的来处理            int sample = wdhSample > hgtSample ? hgtSample : wdhSample;            int minSample = 2;            while (sample > minSample) {                minSample *= 2;            }            return minSample >> 1;        } else {            return 0;        }    }    private float caculateMinCoordinateX(List<Coordinates> list) {        float minX;        minX = list.get(0).getX();        for (int i = 1; i < list.size(); i++) {            if (list.get(i).getX() < minX) {                minX = list.get(i).getX();            }        }        return minX;    }    private float caculateMaxCoordinateX(List<Coordinates> list) {        float maxX;        maxX = list.get(0).getX();        for (int i = 1; i < list.size(); i++) {            if (list.get(i).getX() > maxX) {                maxX = list.get(i).getX();            }        }        return maxX;    }    private float caculateMinCoordinateY(List<Coordinates> list) {        float minY;        minY = list.get(0).getY();        for (int i = 1; i < list.size(); i++) {            if (list.get(i).getY() < minY) {                minY = list.get(i).getY();            }        }        return minY;    }    private float caculateMaxCoordinateY(List<Coordinates> list) {        float maxY;        maxY = list.get(0).getY();        for (int i = 1; i < list.size(); i++) {            if (list.get(i).getY() > maxY) {                maxY = list.get(i).getY();            }        }        return maxY;    }    //图片缩放    private static Bitmap scaleImage(Bitmap bm, int newWidth, int newHeight) {        if (bm == null) {            return null;        }        int width = bm.getWidth();        int height = bm.getHeight();        float scaleWidth = ((float) newWidth) / width;        float scaleHeight = ((float) newHeight) / height;        float scale = 1;        if (scaleWidth >= scaleHeight) {            scale = scaleWidth;        } else {            scale = scaleHeight;        }        Matrix matrix = new Matrix();        matrix.postScale(scale, scale);        Bitmap newbm = Bitmap.createBitmap(bm, 0, 0, width, height, matrix,                true);        return newbm;    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        setMeasuredDimension(viewWdh, viewHgt);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        canvas.drawColor(Color.TRANSPARENT);// 显示背景颜色        Paint paint = new Paint();        paint.setAntiAlias(true);        paint.setColor(Color.WHITE);//        canvas.drawPaint(paint);        // draw1(canvas);        startDraw(canvas, paint);    }    private void startDraw(Canvas canvas, Paint paint) {        for (int i = 0; i < pathNum; i++) {            canvas.save();            drawScene(canvas, paint, i);            canvas.restore();        }    }    private void drawScene(Canvas canvas, Paint paint, int idx) {        canvas.clipPath(path[idx]);        canvas.drawColor(Color.GRAY);        if (bitmapsFlag[idx]) {            canvas.drawBitmap(bitmaps[idx], dp2px(caculateMinCoordinateX(coordinateSetList.get(idx).getCoordinates())) + pathOffsetX + pathOffset[idx][0],                    dp2px(caculateMinCoordinateY(coordinateSetList.get(idx).getCoordinates())) + pathOffsetY + pathOffset[idx][1], paint);        } else {            canvas.drawBitmap(bitmaps[idx], dp2px(caculateMinCoordinateX(coordinateSetList.get(idx).getCoordinates())) + pathOffset[idx][0],                    dp2px(caculateMinCoordinateY(coordinateSetList.get(idx).getCoordinates())) + pathOffset[idx][1], paint);        }    }    private int dp2px(float point) {        return DensityUtil.dip2px(getContext(), point);    }    float ptx, pty;    float pathOffsetX, pathOffsetY;    @Override    public boolean onTouchEvent(MotionEvent event) {        switch (event.getAction()) {            case MotionEvent.ACTION_DOWN:                for (int i = 0; i < pathNum; i++) {                    bitmapsFlag[i] = false;                }                ptx = event.getRawX() - dp2px(leftMargin);                pty = event.getRawY() - dp2px(MARGIN_HEIGHT);                pathOffsetX = 0;                pathOffsetY = 0;                int cflag = 0;                for (cflag = 0; cflag < pathNum; cflag++) {                    if (contains(path[cflag], ptx, pty)) {                        bitmapsFlag[cflag] = true;                        break;                    }                }                break;            case MotionEvent.ACTION_MOVE:                pathOffsetX = event.getRawX() - dp2px(leftMargin) - ptx;                pathOffsetY = event.getRawY() - dp2px(MARGIN_HEIGHT) - pty;                invalidate();                break;            case MotionEvent.ACTION_POINTER_DOWN:                break;            case MotionEvent.ACTION_UP:                for (int i = 0; i < pathNum; i++) {                    if (bitmapsFlag[i]) {                        pathOffset[i][0] += event.getRawX() - dp2px(leftMargin) - ptx;                        pathOffset[i][1] += event.getRawY() - dp2px(MARGIN_HEIGHT) - pty;                        if (pathOffset[i][0] > 0) {                            pathOffset[i][0] = 0;                        }                        if (pathOffset[i][0] < -(bitmaps[i].getWidth() - getViewWidth(coordinateSetList.get(i).getCoordinates()))) {                            pathOffset[i][0] = -(bitmaps[i].getWidth() - getViewWidth(coordinateSetList.get(i).getCoordinates()));                        }                        if (pathOffset[i][1] > 0) {                            pathOffset[i][1] = 0;                        }                        if (pathOffset[i][1] < -(bitmaps[i].getHeight() - getViewHeight(coordinateSetList.get(i).getCoordinates()))) {                            pathOffset[i][1] = -(bitmaps[i].getHeight() - getViewHeight(coordinateSetList.get(i).getCoordinates()));                        }                        bitmapsFlag[i] = false;                        break;                    }                }                invalidate();                break;            default:                break;        }        return true;    }    private boolean contains(Path parapath, float pointx, float pointy) {        RectF localRectF = new RectF();        parapath.computeBounds(localRectF, true);        Region localRegion = new Region();        localRegion.setPath(parapath, new Region((int) localRectF.left,                (int) localRectF.top, (int) localRectF.right,                (int) localRectF.bottom));        return localRegion.contains((int) pointx, (int) pointy);    }    private float getViewWidth(List<Coordinates> list) {        return dp2px(caculateMaxCoordinateX(list) - caculateMinCoordinateX(list));    }    private float getViewHeight(List<Coordinates> list) {        return dp2px(caculateMaxCoordinateY(list) - caculateMinCoordinateY(list));    }}*/