我最近写了一段代码，两个Activity，第一个Activity向第二个Activity传一张图片的位置信息（第二个Activity要用第一张图片的信息），第二个Activity部分内容为
- Java code
class Image{ public Bitmap image; public int imlen=0;//图像总像素数 public int width;//图像像素矩阵宽 public int height;//图像像素高 public int[] pixel;}public class second extends Activity{ /** Called when the activity is first created. */ private ImageButton btn1;//打开文件 private EditText edt3;//显示第二幅图片位置 private ImageButton btn3;//Embedded public ImageButton btn4;//extract private ImageButton btn5;//save private EditText edt;//password private EditText edt1;//message private ImageView img1; public ProgressBar bar; public Random random = new Random(); public String key = null; static int[] epixel= null; public int p=0;//进度条提示 static int b=0; public Image spic = new Image(); public Image fpic = new Image();//也许错 @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Intent intent = getIntent(); findview(); btn1.setOnClickListener(new MyButtonListener());//打开文件，寻找图片 setImg(); String location = intent.getStringExtra("location"); BitmapFactory.Options options = new BitmapFactory.Options(); if(options != null && location != null) { options.inSampleSize = 2; fpic.image = BitmapFactory.decodeFile(location, options);//get first image if(fpic.image != null) { fpic.image = fpic.image.copy(Bitmap.Config.ARGB_8888, true); fpic.imlen = (int) fpic.image.getHeight()*fpic.image.getWidth(); fpic.pixel = new int[fpic.imlen]; fpic.image.getPixels(fpic.pixel,0,fpic.image.getWidth(),0,0,fpic.image.getWidth(),fpic.image.getHeight()); btn3.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v) {//TODO Auto-generated method stub if(b==0) Toast.makeText(second.this,"请先从图库中选择图片或者拍照", Toast.LENGTH_SHORT).show(); else if(edt.getText().toString().length()==0) Toast.makeText(second.this,"请先输入要密钥", Toast.LENGTH_SHORT).show(); if(edt1.getText().toString().length()==0) Toast.makeText(second.this,"请先输入要嵌入的内容", Toast.LENGTH_SHORT).show(); else{ try { key = edt.getText().toString(); byte[] message = edt1.getText().toString().getBytes("ASCII");//嵌入信息（Byte形式) int[] embed = new int[message.length*8]; embed= match(message,fpic.pixel);//得到匹配序列 String slocation = edt3.getText().toString(); BitmapFactory.Options options = new BitmapFactory.Options(); if(options != null && slocation != null) { options.inSampleSize = 2; spic.image = BitmapFactory.decodeFile(slocation, options);//get first image if(spic.image != null) { spic.image = spic.image.copy(Bitmap.Config.ARGB_8888, true); spic.imlen = (int) spic.image.getHeight()*spic.image.getWidth(); spic.pixel = new int[spic.imlen]; spic.image.getPixels(spic.pixel,0,spic.image.getWidth(),0,0,spic.image.getWidth(),spic.image.getHeight()); } } spic.height = spic.image.getHeight(); spic.pixel = embeded(spic.pixel,embed,key);//嵌入匹配序列 edt.setText("");//将Password置空 edt1.setText("");//将嵌入信息置空 b=2; } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } } });