Add colab notebooks for Android build (#525)

docs/source/ncnn/android/build-sherpa-ncnn.rst

@@ -123,6 +123,7 @@ Android ABIs:
   - ``arm64-v8a``
   - ``armeabi-v7a``
   - ``x86_64``
+  - ``x86``
 
 .. caution::
 
@@ -139,6 +140,18 @@ Android ABIs:
 
     `<https://github.com/k2-fsa/sherpa-ncnn/releases>`_
 
+.. hint::
+
+   We provide a colab notebook
+   |build sherpa-ncnn for android colab notebook|
+   for you to try this section step by step.
+
+   If you are using Windows or you don't want to setup your local environment
+   to build the C++ libraries, please use the above colab notebook.
+
+.. |build sherpa-ncnn for android colab notebook| image:: https://colab.research.google.com/assets/colab-badge.svg
+   :target: https://github.com/k2-fsa/colab/blob/master/sherpa-ncnn/build_sherpa_ncnn_for_android.ipynb
+
 Build for arm64-v8a
 ^^^^^^^^^^^^^^^^^^^
 
@@ -244,6 +257,14 @@ You should see the following screen shot after running the above copy ``cp`` com
    :alt: Generated shared libraries for x86_64
    :width: 600
 
+Build for x86
+^^^^^^^^^^^^^
+
+.. code-block:: bash
+
+  cd sherpa-ncnn # Go to the root repo
+  ./build-android-x86.sh
+
 Download pre-trained models
 ---------------------------
 

docs/source/onnx/android/build-sherpa-onnx.rst

@@ -152,6 +152,7 @@ Android ABIs:
   - ``arm64-v8a``
   - ``armv7-eabi``
   - ``x86_64``
+  - ``x86``
 
 .. caution::
 
@@ -160,6 +161,26 @@ Android ABIs:
 
   If you want to test the app on an emulator, you probably need ``x86_64``.
 
+.. hint::
+
+   Building scripts for this section are for macOS and Linux. If you are
+   using Windows or if you don't want to build the shared libraries by yourself,
+   you can download pre-compiled shared libraries for this section by visiting
+
+    `<https://github.com/k2-fsa/sherpa-onnx/releases>`_
+
+.. hint::
+
+   We provide a colab notebook
+   |build sherpa-onnx for android colab notebook|
+   for you to try this section step by step.
+
+   If you are using Windows or you don't want to setup your local environment
+   to build the C++ libraries, please use the above colab notebook.
+
+.. |build sherpa-onnx for android colab notebook| image:: https://colab.research.google.com/assets/colab-badge.svg
+   :target: https://github.com/k2-fsa/colab/blob/master/sherpa-onnx/build_sherpa_onnx_for_android.ipynb
+
 Build for arm64-v8a
 ^^^^^^^^^^^^^^^^^^^
 
@@ -260,6 +281,14 @@ You should see the following screen shot after running the above copy ``cp`` com
    :alt: Generated shared libraries for x86_64
    :width: 600
 
+Build for x86
+^^^^^^^^^^^^^
+
+.. code-block:: bash
+
+  cd sherpa-onnx # Go to the root repo
+  ./build-android-x86.sh
+
 Download pre-trained models
 ---------------------------