QGIS Python Importing layers from a plugin UI (Version 2.x)

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Import raster and vector layers from a QGIS plugin user interface. Learn how to create drop down combo boxes showing the names of loaded layers, add layers to the drop downs, and update line edits with file names when new layers are loaded.
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excellent work! I would like to know if I charge 2 raster layers. How can I work those 2 layers inside my plugin? I want to do something similar to a raster calculator. Please I need your help!
excelente trabajo, quisiera saber si yo cargo 2 capas raster ¿como puedo trabajar esas 2 capas dentro de mi herramienta? quiero hacer algo parecido a una calculadora raster. por favor necesito tu ayuda.
From Perú

jhonchahua
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have created a plugin in QGIS 2.10.1. After making some modifications in the ui file in Qt Designer and reloaded the plugin or restarted QGIS or restarted the pc these are not incorporated.

anushkasingh