ndk/samples/bitmap-plasma/src/com/example/plasma/Plasma.java

/*
 * Copyright (C) 2010 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 com.example.plasma;

import android.app.Activity;
import android.os.Bundle;
import android.content.Context;
import android.view.View;
import android.graphics.Bitmap;
import android.graphics.Canvas;

public class Plasma extends Activity
{
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(new PlasmaView(this));
    }

    /* load our native library */
    static {
        System.loadLibrary("plasma");
    }
}

class PlasmaView extends View {
    private Bitmap mBitmap;
    private long mStartTime;

    /* implementend by libplasma.so */
    private static native void renderPlasma(Bitmap  bitmap, long time_ms);

    public PlasmaView(Context context) {
        super(context);

        final int W = 200;
        final int H = 200;

        mBitmap = Bitmap.createBitmap(W, H, Bitmap.Config.RGB_565);
        mStartTime = System.currentTimeMillis();
    }

    @Override protected void onDraw(Canvas canvas) {
        //canvas.drawColor(0xFFCCCCCC);
        renderPlasma(mBitmap, System.currentTimeMillis() - mStartTime);
        canvas.drawBitmap(mBitmap, 0, 0, null);
        // force a redraw, with a different time-based pattern.
        invalidate();
    }
}