Android example source code file (BigCacheTest.java)

This example Android source code file (BigCacheTest.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

activityinstrumentationtestcase, android, bigcachetest, bitmap, drawing, exception, graphics, mediumtest, override, paint, runnable, test, ui, view

The BigCacheTest.java Android example source code

/*
 * Copyright (C) 2007 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.view;

import android.view.BigCache;
import com.android.frameworks.coretests.R;

import android.test.ActivityInstrumentationTestCase;
import android.test.suitebuilder.annotation.MediumTest;
import android.view.View;
import android.view.ViewConfiguration;
import android.graphics.Bitmap;

/**
 * Builds the drawing cache of two Views, one smaller than the maximum cache size,
 * one larger than the maximum cache size. The latter should always have a null
 * drawing cache.
 */
public class BigCacheTest extends ActivityInstrumentationTestCase<BigCache> {
    private View mTiny;
    private View mLarge;

    public BigCacheTest() {
        super("com.android.frameworks.coretests", BigCache.class);
    }

    @Override
    public void setUp() throws Exception {
        super.setUp();

        final BigCache activity = getActivity();
        mTiny = activity.findViewById(R.id.a);
        mLarge = activity.findViewById(R.id.b);
    }

    @MediumTest
    public void testSetUpConditions() throws Exception {
        assertNotNull(mTiny);
        assertNotNull(mLarge);
    }

    @MediumTest
    public void testDrawingCacheBelowMaximumSize() throws Exception {
        final int max = ViewConfiguration.get(getActivity()).getScaledMaximumDrawingCacheSize();
        assertTrue(mTiny.getWidth() * mTiny.getHeight() * 2 < max);
        assertNotNull(createCacheForView(mTiny));
    }

    // TODO: needs to be adjusted to pass on non-HVGA displays
    // @MediumTest
    public void testDrawingCacheAboveMaximumSize() throws Exception {
        final int max = ViewConfiguration.get(getActivity()).getScaledMaximumDrawingCacheSize();
        assertTrue(mLarge.getWidth() * mLarge.getHeight() * 2 > max);
        assertNull(createCacheForView(mLarge));
    }

    private Bitmap createCacheForView(final View view) {
        final Bitmap[] cache = new Bitmap[1];
        getActivity().runOnUiThread(new Runnable() {
            public void run() {
                view.setDrawingCacheEnabled(true);
                view.invalidate();
                view.buildDrawingCache();
                cache[0] = view.getDrawingCache();
            }
        });
        getInstrumentation().waitForIdleSync();
        return cache[0];
    }
}