Android example source code file (ContentQueryMapTest.java)

This example Android source code file (ContentQueryMapTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, androidtestcase, content, contentquerymap, contentquerymaptest, contentvalues, cursor, looperthread, mediumtest, new, object, observer, os, provider, runnable, string, test, throwable, util, value

The ContentQueryMapTest.java Android example source code

/*
 * Copyright (C) 2008 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.content;

import android.content.ContentQueryMap;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.database.Cursor;
import android.os.Handler;
import android.os.Looper;
import android.provider.Settings;
import android.test.AndroidTestCase;
import android.test.suitebuilder.annotation.MediumTest;

import java.util.Observable;
import java.util.Observer;

/** Test of {@link ContentQueryMap} */
public class ContentQueryMapTest extends AndroidTestCase {
    /** Helper class to run test code in a new thread with a Looper. */
    private abstract class LooperThread extends Thread {
        public Throwable mError = null;
        public boolean mSuccess = false;

        abstract void go();

        public void run() {
            try {
                Looper.prepare();
                go();
                Looper.loop();
            } catch (Throwable e) {
                mError = e;
            }
        }
    }

    @MediumTest
    public void testContentQueryMap() throws Throwable {
        LooperThread thread = new LooperThread() {
            void go() {
                ContentResolver r = getContext().getContentResolver();
                Settings.System.putString(r, "test", "Value");
                Cursor cursor = r.query(
                        Settings.System.CONTENT_URI,
                        new String[] {
                            Settings.System.NAME,
                            Settings.System.VALUE,
                        }, null, null, null);

                final ContentQueryMap cqm = new ContentQueryMap(
                        cursor, Settings.System.NAME, true, null);
                // Get the current state of the CQM. This forces a requery and means that the
                // call to getValues() below won't do a requery().
                cqm.getRows();
                
                // The cache won't notice changes until the loop runs.
                Settings.System.putString(r, "test", "New Value");
                ContentValues v = cqm.getValues("test");
                String value = v.getAsString(Settings.System.VALUE);
                assertEquals("Value", value);

                // Use an Observer to find out when the cache does update.
                cqm.addObserver(new Observer() {
                    public void update(Observable o, Object arg) {
                        // Should have the new values by now.
                        ContentValues v = cqm.getValues("test");
                        String value = v.getAsString(Settings.System.VALUE);
                        assertEquals("New Value", value);
                        Looper.myLooper().quit();
                        cqm.close();
                        mSuccess = true;
                    }
                });

                // Give up after a few seconds, if it doesn't.
                new Handler().postDelayed(new Runnable() {
                    public void run() {
                        fail("Timed out");
                    }
                }, 5000);
            }
        };

        thread.start();
        thread.join();
        if (thread.mError != null) throw thread.mError;
        assertTrue(thread.mSuccess);
    }
}