Add LoaderTestCase that makes it easier to test Loaders.

>

</method>

</class>

<class name="LoaderTestCase"

 extends="android.test.AndroidTestCase"

 abstract="false"

 static="false"

 final="false"

 deprecated="not deprecated"

 visibility="public"

>

<constructor name="LoaderTestCase"

 type="android.test.LoaderTestCase"

 static="false"

 final="false"

 deprecated="not deprecated"

 visibility="public"

>

</constructor>

<method name="getLoaderResultSynchronously"

 return="T"

 abstract="false"

 native="false"

 synchronized="false"

 static="false"

 final="false"

 deprecated="not deprecated"

 visibility="public"

>

<parameter name="loader" type="android.content.Loader&lt;T&gt;">

</parameter>

</method>

</class>

<class name="MoreAsserts"

 extends="java.lang.Object"

 abstract="false"

/*

 * Copyright (C) 2010 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License

 */

package android.test;

import android.content.Loader;

import android.content.Loader.OnLoadCompleteListener;

import android.os.AsyncTask;

import android.os.Handler;

import android.os.Looper;

import android.os.Message;

import java.util.concurrent.ArrayBlockingQueue;

/**

 * A convenience class for testing {@link Loader}s. This test case

 * provides a simple way to synchronously get the result from a Loader making

 * it easy to assert that the Loader returns the expected result.

 */

public class LoaderTestCase extends AndroidTestCase {

    static {

        // Force class loading of AsyncTask on the main thread so that it's handlers are tied to

        // the main thread and responses from the worker thread get delivered on the main thread.

        // The tests are run on another thread, allowing them to block waiting on a response from

        // the code running on the main thread. The main thread can't block since the AysncTask

        // results come in via the event loop.

        new AsyncTask<Void, Void, Void>() {

            @Override

            protected Void doInBackground(Void... args) {return null;}

            @Override

            protected void onPostExecute(Void result) {}

        };

    }

    /**

     * Runs a Loader synchronously and returns the result of the load. The loader will

     * be started, stopped, and destroyed by this method so it cannot be reused.

     *

     * @param loader The loader to run synchronously

     * @return The result from the loader

     */

    public <T> T getLoaderResultSynchronously(final Loader<T> loader) {

        // The test thread blocks on this queue until the loader puts it's result in

        final ArrayBlockingQueue<T> queue = new ArrayBlockingQueue<T>(1);

        // This callback runs on the "main" thread and unblocks the test thread

        // when it puts the result into the blocking queue

        final OnLoadCompleteListener<T> listener = new OnLoadCompleteListener<T>() {

            @Override

            public void onLoadComplete(Loader<T> completedLoader, T data) {

                // Shut the loader down

                completedLoader.unregisterListener(this);

                completedLoader.stopLoading();

                completedLoader.destroy();

                // Store the result, unblocking the test thread

                queue.add(data);

            }

        };

        // This handler runs on the "main" thread of the process since AsyncTask

        // is documented as needing to run on the main thread and many Loaders use

        // AsyncTask

        final Handler mainThreadHandler = new Handler(Looper.getMainLooper()) {

            @Override

            public void handleMessage(Message msg) {

                loader.registerListener(0, listener);

                loader.startLoading();

            }

        };

        // Ask the main thread to start the loading process

        mainThreadHandler.sendEmptyMessage(0);

        // Block on the queue waiting for the result of the load to be inserted

        T result;

        while (true) {

            try {

                result = queue.take();

                break;

            } catch (InterruptedException e) {

                throw new RuntimeException("waiting thread interrupted", e);

            }

        }

        return result;

    }

}