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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.example.android.platform_library;
     18 
     19 import android.util.Config;
     20 import android.util.Log;
     21 
     22 public final class PlatformLibrary {
     23     static {
     24         /*
     25          * Load the library.  If it's already loaded, this does nothing.
     26          */
     27         System.loadLibrary("platform_library_jni");
     28     }
     29 
     30     private int mJniInt = -1;
     31 
     32     public PlatformLibrary() {}
     33 
     34     /*
     35      * Test native methods.
     36      */
     37     public int getInt(boolean bad) {
     38         /* this alters mJniInt */
     39         int result = getJniInt(bad);
     40 
     41         /* reverse a string, for no very good reason */
     42         String reverse = reverseString("Android!");
     43 
     44         Log.i("PlatformLibrary", "getInt: " + result + ", '" + reverse + "'");
     45 
     46         return mJniInt;
     47     }
     48 
     49     /*
     50      * Simple method, called from native code.
     51      */
     52     private static void yodel(String msg) {
     53         Log.d("PlatformLibrary", "yodel: " + msg);
     54     }
     55 
     56     /*
     57      * Trivial native method call.  If "bad" is true, this will throw an
     58      * exception.
     59      */
     60     native private int getJniInt(boolean bad);
     61 
     62     /*
     63      * Native method that returns a new string that is the reverse of
     64      * the original.  This also calls yodel().
     65      */
     66     native private static String reverseString(String str);
     67 }
     68