Android example source code file (JniLibTest.java)

This example Android source code file (JniLibTest.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, could, exception, jni, jnilibtest, override, suppress, test, testcase, unsatisfiedlinkerror, util, utilities, utils, warning

The JniLibTest.java Android example source code

/*
 * Copyright (C) 2006 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.core;

import android.test.suitebuilder.annotation.Suppress;
import android.util.Log;
import junit.framework.TestCase;


@Suppress
public class JniLibTest extends TestCase {

    @Override
    protected void setUp() throws Exception {
        super.setUp();
        /*
         * This causes the native shared library to be loaded when the
         * class is first used.  The library is only loaded once, even if
         * multiple classes include this line.
         *
         * The library must be in java.library.path, which is derived from
         * LD_LIBRARY_PATH.  The actual library name searched for will be
         * "libjni_lib_test.so" under Linux, but may be different on other
         * platforms.
         */
        try {
            System.loadLibrary("jni_lib_test");
        } catch (UnsatisfiedLinkError ule) {
            Log.e("JniLibTest", "WARNING: Could not load jni_lib_test natives");
        }
    }

    private static native int nativeStaticThing(float f);
    private native void nativeThing(int val);

    public void testNativeCall() {
        Log.i("JniLibTest", "JNI search path is "
                + System.getProperty("java.library.path"));
        Log.i("JniLibTest", "'jni_lib_test' becomes '"
                + System.mapLibraryName("jni_lib_test") + "'");

        int result = nativeStaticThing(1234.5f);
        nativeThing(result);
    }
}