When setting up the ToolManager, the default Tool is the Pan Tool. To change the tool, use ToolManager.setTool(ToolManager.Tool) API.

For example, to switch to the Text Highlighting tool, do the following:

mToolManager.Tool = mToolManager.CreateTool(ToolManager.ToolMode.TextHighlight, mToolManager.Tool);

To continuously using the same tool, do:

var tool = mToolManager.CreateTool(ToolManager.ToolMode.TextHighlight, mToolManager.Tool);
((Tool) tool).ForceSameNextToolMode = true;
mToolManager.Tool = tool;