写文章先上图 字体随便画

qianming.jpg

  /**
     * 自定义签名控件
     */
    class SignatureView extends View {

        //画笔
        private Paint paint;

        //画布
        private Canvas cacheCanvas;

        //位图
        private Bitmap cachebBitmap;

        //图片保存路径
        private Path path;

        //位图缓存
        public Bitmap getCachebBitmap() {
            return cachebBitmap;
        }

        public SignatureView(Context context) {
            super(context);
            init();
        }

        /**
         * 初始化
         */
        private void init() {
            //设置画笔
            paint = new Paint();
            paint.setAntiAlias(true);
            paint.setStrokeWidth(20);
            paint.setStyle(Paint.Style.STROKE);
            paint.setColor(Color.BLACK);
            path = new Path();

            //创建位图
            cachebBitmap = Bitmap.createBitmap(10, 10, Bitmap.Config.ARGB_8888);

            //用自定义位图构建画布
            cacheCanvas = new Canvas(cachebBitmap);
            //设置画布为白色
            cacheCanvas.drawColor(Color.WHITE);
        }

        /**
         * 清除画板，重置画笔
         */
        public void clear() {
            if (cacheCanvas != null) {
                paint.setColor(Color.WHITE);
                cacheCanvas.drawPaint(paint);
                paint.setColor(Color.BLACK);
                cacheCanvas.drawColor(Color.WHITE);
                invalidate();
            }
        }

        @Override
        protected void onDraw(Canvas canvas) {
            canvas.drawBitmap(cachebBitmap, 0, 0, null);
            canvas.drawPath(path, paint);
        }

        @Override
        protected void onSizeChanged(int w, int h, int oldw, int oldh) {

            int curW = cachebBitmap != null ? cachebBitmap.getWidth() : 0;
            int curH = cachebBitmap != null ? cachebBitmap.getHeight() : 0;
            if (curW >= w && curH >= h) {
                return;
            }

            if (curW < w) curW = w;
            if (curH < h) curH = h;
            Bitmap newBitmap = Bitmap.createBitmap(curW, curH, Bitmap.Config.ARGB_8888);
            Canvas newCanvas = new Canvas();
            newCanvas.setBitmap(newBitmap);
            if (cachebBitmap != null) {
                newCanvas.drawBitmap(cachebBitmap, 0, 0, null);
            }
            cachebBitmap = newBitmap;
            cacheCanvas = newCanvas;
        }

        private float cur_x, cur_y;

        @Override
        public boolean onTouchEvent(MotionEvent event) {
            float x = event.getX();
            float y = event.getY();
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN: {
                    cur_x = x;
                    cur_y = y;
                    path.moveTo(cur_x, cur_y);
                    break;
                }
                case MotionEvent.ACTION_MOVE: {
                    path.quadTo(cur_x, cur_y, x, y);
                    cur_x = x;
                    cur_y = y;
                    break;
                }
                case MotionEvent.ACTION_UP: {
                    cacheCanvas.drawPath(path, paint);
                    path.reset();
                    break;
                }
            }
            invalidate();
            return true;
        }

    }


在xml里创建

        <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/fl_view"
        android:background="@color/white"
        ></FrameLayout>

        SignatureView mView = new SignatureView(this);
        frameLayout.addView(mView);
        mView.requestFocus();

保存bitmap  直接调用
         Bitmap bitmap = mView.getCachebBitmap();

结束！！！！！！