1 package io.github.froger.jni;
 2 
 3 import android.app.Activity;
 4 import android.graphics.Bitmap;
 5 import android.graphics.drawable.BitmapDrawable;
 6 import android.os.Bundle;
 7 import android.view.View;
 8 import android.widget.Button;
 9 import android.widget.ImageView;
10 
11 public
 
 class MyActivity extends Activity {
12     /** Called when the activity is first created. */
13     ImageView imgView;
14     Button btnNDK, btnRestore;
15     public static native int[] ImgFun(int[] buf, int w, int h);
16     static {
17         System.loadLibrary("ImgFun");
18     }
19     @Override
 
20     public void onCreate(Bundle savedInstanceState) {
21         super.onCreate(savedInstanceState);
22         setContentView(R.layout.activity_my);
23 
24         this.setTitle("使用NDK轉換灰度圖");
25         btnRestore = (Button) this.findViewById(R.id.btnRestore);
26         //btnRestore.setText(ImgFun());
 

27         btnRestore.setOnClickListener(new ClickEvent());
28         btnNDK = (Button) this.findViewById(R.id.btnNDK);
29         btnNDK.setOnClickListener(new ClickEvent());
30         imgView = (ImageView) this.findViewById(R.id.ImageView01);
31         Bitmap img = ((BitmapDrawable) getResources().getDrawable(
32                 R.drawable.ic_launcher)).getBitmap();
33         imgView.setImageBitmap(img);
34     }
35 
36     class ClickEvent implements View.OnClickListener {
37         public void onClick(View v) {
38             //btnRestore.setText(ImgFun());
39             if (v == btnNDK) {
40                 long current = System.currentTimeMillis();
41                 Bitmap img1 = ((BitmapDrawable) getResources().getDrawable(
42                         R.drawable.ic_launcher)).getBitmap();
43                 int w = img1.getWidth(), h = img1.getHeight();
44                 int[] pix = new int[w * h];
45                 img1.getPixels(pix, 0, w, 0, 0, w, h);
46                 int[] resultInt = ImgFun(pix, w, h);
47                 Bitmap resultImg = Bitmap.createBitmap(w, h, Bitmap.Config.RGB_565);
48                 resultImg.setPixels(resultInt, 0, w, 0, 0, w, h);
49                 long performance = System.currentTimeMillis() - current;
50                 imgView.setImageBitmap(resultImg);
51             } else if (v == btnRestore) {
52                 Bitmap img2 = ((BitmapDrawable) getResources().getDrawable(
53                         R.drawable.ic_launcher)).getBitmap();
54                 imgView.setImageBitmap(img2);
55             }
56         }
57     }
58 
59 
60 }