Android example source code file (MemoryFileProviderTest.java)

This example Android source code file (MemoryFileProviderTest.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, contentresolver, exception, failed, inputstream, io, mediumtest, memoryfileprovidertest, net, network, test, uri

The MemoryFileProviderTest.java Android example source code

/*
 * Copyright (C) 2009 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.ContentResolver;
import android.net.Uri;
import android.test.AndroidTestCase;
import android.test.suitebuilder.annotation.MediumTest;

import java.io.InputStream;
import java.util.Arrays;

/**
 * Tests reading a MemoryFile-based AssestFile from a ContentProvider running
 * in a different process.
 */
public class MemoryFileProviderTest extends AndroidTestCase {

    // reads from a cross-process AssetFileDescriptor for a MemoryFile
    @MediumTest
    public void testRead() throws Exception {
        ContentResolver resolver = getContext().getContentResolver();
        Uri uri = Uri.parse("content://android.content.MemoryFileProvider/data/1/blob");
        byte[] buf = new byte[MemoryFileProvider.TEST_BLOB.length];
        InputStream in = resolver.openInputStream(uri);
        assertNotNull(in);
        int count = in.read(buf);
        assertEquals(buf.length, count);
        assertEquals(-1, in.read());
        in.close();
        assertTrue(Arrays.equals(MemoryFileProvider.TEST_BLOB, buf));
    }

    // tests that we don't leak file descriptors or virtual address space
    @MediumTest
    public void testClose() throws Exception {
        ContentResolver resolver = getContext().getContentResolver();
        // open enough file descriptors that we will crash something if we leak FDs
        // or address space
        for (int i = 0; i < 1025; i++) {
            Uri uri = Uri.parse("content://android.content.MemoryFileProvider/huge");
            InputStream in = resolver.openInputStream(uri);
            assertNotNull("Failed to open stream number " + i, in);
            assertEquals(1000000, in.skip(1000000));
            byte[] buf = new byte[MemoryFileProvider.TEST_BLOB.length];
            int count = in.read(buf);
            assertEquals(buf.length, count);
            assertTrue(Arrays.equals(MemoryFileProvider.TEST_BLOB, buf));
            in.close();
        }
    }

    // tests that we haven't broken AssestFileDescriptors for normal files.
    @MediumTest
    public void testFile() throws Exception {
        ContentResolver resolver = getContext().getContentResolver();
        Uri uri = Uri.parse("content://android.content.MemoryFileProvider/file");
        byte[] buf = new byte[MemoryFileProvider.TEST_BLOB.length];
        InputStream in = resolver.openInputStream(uri);
        assertNotNull(in);
        int count = in.read(buf);
        assertEquals(buf.length, count);
        assertEquals(-1, in.read());
        in.close();
        assertTrue(Arrays.equals(MemoryFileProvider.TEST_BLOB, buf));
    }

}