DoodleParams params = new DoodleParams(); // 涂鸦参数
params.mImagePath = imagePath; // the file path of image
DoodleActivity.startActivityForResult(MainActivity.this, params, REQ_CODE_DOODLE);

/*
Whether or not to optimize drawing, it is suggested to open, which can optimize the drawing speed and performance.
Note: When item is selected for editing after opening, it will be drawn at the top level, and not at the corresponding level until editing is completed.
是否优化绘制，建议开启，可优化绘制速度和性能.
注意：开启后item被选中编辑时时会绘制在最上面一层，直到结束编辑后才绘制在相应层级
 */
boolean optimizeDrawing = true;
DoodleView mDoodleView = new DoodleView(this, bitmap, optimizeDrawing, new IDoodleListener() {
            /*
            called when save the doodled iamge. 
            保存涂鸦图像时调用
             */
            @Override
            public void onSaved(IDoodle doodle, Bitmap bitmap, Runnable callback) {
               //do something
            }

            /*
             called when it is ready to doodle because the view has been measured. Now, you can set size, color, pen, shape, etc. 
             此时view已经测量完成，涂鸦前的准备工作已经完成，在这里可以设置大小、颜色、画笔、形状等。
             */
            @Override
            public void onReady(IDoodle doodle) {
                //do something
            }
        });

mTouchGestureListener = new DoodleOnTouchGestureListener(mDoodleView, new DoodleOnTouchGestureListener.ISelectionListener() {
    /*
     called when the item(such as text, texture) is selected/unselected.
     item（如文字，贴图）被选中或取消选中时回调
     */
    @Override
    public void onSelectedItem(IDoodle doodle, IDoodleSelectableItem selectableItem, boolean selected) {
        //do something
    }

    /*
     called when you click the view to create a item(such as text, texture).
     点击View中的某个点创建可选择的item（如文字，贴图）时回调
     */
    @Override
    public void onCreateSelectableItem(IDoodle doodle, float x, float y) {
        //do something
        /*
if (mDoodleView.getPen() == DoodlePen.TEXT) {
        IDoodleSelectableItem item = new DoodleText(mDoodleView, "hello", 20 * mDoodleView.getUnitSize(), new DoodleColor(Color.RED), x, y);
        mDoodleView.addItem(item);
} else if (mDoodleView.getPen() == DoodlePen.BITMAP) {
        IDoodleSelectableItem item = new DoodleBitmap(mDoodleView, bitmap, 80 * mDoodle.getUnitSize(), x, y);
        mDoodleView.addItem(item);
}
        */
    }
});

// create touch detector, which dectects the gesture of scoll, scale, single tap, etc.
// 创建手势识别器，识别滚动，缩放，点击等手势
IDoodleTouchDetector detector = new DoodleTouchDetector(getApplicationContext(), mTouchGestureListener);
mDoodleView.setDefaultTouchDetector(detector);

// Setting parameters.设置参数
mDoodleView.setPen(DoodlePen.TEXT);
mDoodleView.setShape(DoodleShape.HAND_WRITE);
mDoodleView.setColor(new DoodleColor(Color.RED));

// when you are creating a item or selecting a item to edit
if (mDoodle.isOptimizeDrawing()) {
   mDoodle.markItemToOptimizeDrawing(item);
} else {
   mDoodle.addItem(item);
}

...

// finish creating or editting
if (mDoodle.isOptimizeDrawing()) {
   mDoodle.notifyItemFinishedDrawing(item);
}

public interface IDoodle {
...
    public float getUnitSize();
    public void setDoodleRotation(int degree);
    public void setDoodleScale(float scale, float pivotX, float pivotY);
    public void setPen(IDoodlePen pen);
    public void setShape(IDoodleShape shape);
    public void setDoodleTranslation(float transX, float transY);
    public void setSize(float paintSize);
    public void setColor(IDoodleColor color);
    public void addItem(IDoodleItem doodleItem);
    public void removeItem(IDoodleItem doodleItem);
    public void save();
    public void topItem(IDoodleItem item);
    public void bottomItem(IDoodleItem item);
    public boolean undo(int step);
...
}