64 lines
2.0 KiB
ReStructuredText
64 lines
2.0 KiB
ReStructuredText
*********************************************
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Base Loader Callback Interface Implementation
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*********************************************
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.. highlight:: java
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.. class:: BaseLoaderCallback
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Basic implementation of ``LoaderCallbackInterface``. Logic of this implementation is
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well-described by the following scheme:
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.. image:: img/AndroidAppUsageModel.png
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Using in Java Activity
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----------------------
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There is a very base code snippet implementing the async initialization with ``BaseLoaderCallback``.
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See the "15-puzzle" OpenCV sample for details.
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.. code-block:: java
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:linenos:
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public class MyActivity extends Activity implements HelperCallbackInterface
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{
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private BaseLoaderCallback mOpenCVCallBack = new BaseLoaderCallback(this) {
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@Override
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public void onManagerConnected(int status) {
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switch (status) {
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case LoaderCallbackInterface.SUCCESS:
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{
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Log.i(TAG, "OpenCV loaded successfully");
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// Create and set View
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mView = new puzzle15View(mAppContext);
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setContentView(mView);
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} break;
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default:
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{
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super.onManagerConnected(status);
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} break;
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}
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}
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};
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/** Call on every application resume **/
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@Override
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protected void onResume()
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{
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Log.i(TAG, "Called onResume");
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super.onResume();
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Log.i(TAG, "Trying to load OpenCV library");
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if (!OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_6, this, mOpenCVCallBack))
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{
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Log.e(TAG, "Cannot connect to OpenCV Manager");
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}
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}
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Using in Service
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----------------
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Default ``BaseLoaderCallback`` implementation treats application context as ``Activity`` and calls
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``Activity.finish()`` method to exit in case of initialization failure.
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To override this behavior you need to override ``finish()`` method of ``BaseLoaderCallback`` class
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and implement your own finalization method.
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