Android JNI图像处理经典例子

/* * IBMPhotoPhun.java * * Author: Frank Ableson * Contact Info: fableson@navitend.com */ package com.msi.ibm.ndk; import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.graphics.BitmapFactory; import android.graphics.Bitmap; import android.graphics.Bitmap.Config; import android.view.View; import android.widget.ImageView; public class IBMPhotoPhun extends Activity { private String tag = "IBMPhotoPhun"; private Bitmap bitmapOrig = null; private Bitmap bitmapGray = null; private Bitmap bitmapWip = null; private ImageView ivDisplay = null; // NDK STUFF static { System.loadLibrary("ibmphotophun"); } public native void convertToGray(Bitmap bitmapIn,Bitmap bitmapOut); public native void changeBrightness(int direction,Bitmap bitmap); public native void findEdges(Bitmap bitmapIn,Bitmap bitmapOut); // END NDK STUFF /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Log.i(tag,"before image stuff"); ivDisplay = (ImageView) findViewById(R.id.ivDisplay); // load bitmap from resources BitmapFactory.Options options = new BitmapFactory.Options(); // Make sure it is 24 bit color as our image processing algorithm expects this format options.inPreferredConfig = Config.ARGB_8888; bitmapOrig = BitmapFactory.decodeResource(this.getResources(), R.drawable.sampleimage,options); if (bitmapOrig != null) ivDisplay.setImageBitmap(bitmapOrig); } public void onResetImage(View v) { Log.i(tag,"onResetImage"); ivDisplay.setImageBitmap(bitmapOrig); } public void onFindEdges(View v) { Log.i(tag,"onFindEdges"); // make sure our target bitmaps are happy bitmapGray = Bitmap.createBitmap(bitmapOrig.getWidth(),bitmapOrig.getHeight(),Config.ALPHA_8); bitmapWip = Bitmap.createBitmap(bitmapOrig.getWidth(),bitmapOrig.getHeight(),Config.ALPHA_8); // before finding edges, we need to convert this image to gray convertToGray(bitmapOrig,bitmapGray); // find edges in the image findEdges(bitmapGray,bitmapWip); ivDisplay.setImageBitmap(bitmapWip); } public void onConvertToGray(View v) { Log.i(tag,"onConvertToGray"); bitmapWip = Bitmap.createBitmap(bitmapOrig.getWidth(),bitmapOrig.getHeight(),Config.ALPHA_8); convertToGray(bitmapOrig,bitmapWip); ivDisplay.setImageBitmap(bitmapWip); } public void onDimmer(View v) { Log.i(tag,"onDimmer"); changeBrightness(2,bitmapWip); ivDisplay.setImageBitmap(bitmapWip); } public void onBrighter(View v) { Log.i(tag,"onBrighter"); changeBrightness(1,bitmapWip); ivDisplay.setImageBitmap(bitmapWip); } }