DemoActivity.java

/*
 * 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.
 *
 * This is a small port of the "San Angeles Observation" demo
 * program for OpenGL ES 1.x. For more details, see:
 *
 *    http://jet.ro/visuals/san-angeles-observation/
 *
 * This program demonstrates how to use a GLSurfaceView from Java
 * along with native OpenGL calls to perform frame rendering.
 *
 * Touching the screen will start/stop the animation.
 *
 * Note that the demo runs much faster on the emulator than on
 * real devices, this is mainly due to the following facts:
 *
 * - the demo sends bazillions of polygons to OpenGL without
 *   even trying to do culling. Most of them are clearly out
 *   of view.
 *
 * - on a real device, the GPU bus is the real bottleneck
 *   that prevent the demo from getting acceptable performance.
 *
 * - the software OpenGL engine used in the emulator uses
 *   the system bus instead, and its code rocks :-)
 *
 * Fixing the program to send less polygons to the GPU is left
 * as an exercise to the reader. As always, patches welcomed :-)
 */
package com.example.combinedSplits;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class DemoActivity extends Activity {

    /**
     * Called when the activity is first created.
     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        /* Create a TextView and set its content.
         * the text is retrieved by calling a native
         * function.
         */
        TextView tv = new TextView(this);
        tv.setText(stringFromJNI());
        setContentView(tv);
    }

    /* A native method that is implemented by the
     * 'hello-jni' native library, which is packaged
     * with this application.
     */
    public native String stringFromJNI();

    public native String jniNameFromJNI();

    /* this is used to load the 'hello-jni' library on application
     * startup. The library has already been unpacked into
     * /data/data/com.example.hellojni/lib/libhello-jni.so at
     * installation time by the package manager.
     */
    static {
        System.loadLibrary("hello-jni");
    }
}