unity上面调用andorid相册的插件-android部分

由于最近项目需要做，一个简单的unity3d上面链接android原生相册获取图片的插件，于是乎简单的了解了一下，以下是实现步骤:

1.从unity3d的项目路径中拷出jar包unity3D5.0\u3d\Unity\Editor\Data\PlaybackEngines\androidplayer\release\bin\classess

2.新建一个acitivity把classes.jre包放入libs文件夹，并创建一个继承自UnityPlayerActivity的类

2.1导入classes.jar

2.2创建继承自UnityPlayerActivity的类

public class Main extends UnityPlayerActivity{private String photoPath="";public static String FILE_NAME = "image.png";public static final int CHOOSE_PICTURE=4;private String newPath="";    private String headPath="";@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);}}

3.主要的类中书写供unity脚本回调的方法(Main()是实现打开相册的方法，RefreshPic是实现图片截图之后保存到照相机中的相册方法)

public void Main(){Intent openAlbumIntent = new Intent(Intent.ACTION_GET_CONTENT);      openAlbumIntent.setType("image/*");              startActivityForResult(openAlbumIntent, CHOOSE_PICTURE);  } public void RefreshPic(String oldpath) { photoPath="/mnt/sdcard/DCIM/Camera/"; SimpleDateFormat sDateFormat=new SimpleDateFormat("yyyyMMddhhmmss");      FILE_NAME="p"+sDateFormat.format(new java.util.Date())+".png";  copyFile(oldpath, photoPath); myDeleteFile(oldpath); Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);  Uri uri = Uri.fromFile(new File(photoPath+FILE_NAME));  intent.setData(uri);  sendBroadcast(intent);   }

4.书写打开相册选择图片之后的回调方法

 @Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {    // 拍照          if(requestCode==CHOOSE_PICTURE)        {             Uri originalUri = data.getData();               String[] proj = {MediaStore.Images.Media.DATA}; Cursor cursor = getContentResolver().query(originalUri, proj, null, null, null);  int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); cursor.moveToFirst();     //判断游标是否为空 if(cursor.getString(column_index)!=null) {     //得到选择图片的原始路径 String oldpath = cursor.getString(column_index);  //保存原始图片的路径 newPath="/mnt/sdcard/Android/data/com.unitypluginstest.main/files/sourcefiles"; //保存压缩后图片的路径 headPath="/mnt/sdcard/Android/data/com.unitypluginstest.main/files/headfiles"; SimpleDateFormat sDateFormat=new SimpleDateFormat("yyyyMMddhhmmss");      FILE_NAME="p"+sDateFormat.format(new java.util.Date())+".png";   //将选择的图片文件复制到新的路径 copyFile(oldpath, newPath); //位图工厂模式打开对图片进行压缩设置 BitmapFactory.Options options = new BitmapFactory.Options();             options.inSampleSize =2;             Bitmap b = BitmapFactory.decodeFile(newPath+"/"+FILE_NAME, options);         BitmapFactory.Options options1 = new BitmapFactory.Options();             options1.inSampleSize =getSuitableSize(b.getWidth()*2,b.getHeight()*2);             Bitmap b1= BitmapFactory.decodeFile(newPath+"/"+FILE_NAME, options1);             saveBitmap(headPath, b1);             }             else             {  Toast.makeText(getApplicationContext(), "当前的路径不存在", Toast.LENGTH_SHORT).show();             }        }super.onActivityResult(requestCode, resultCode, data);}

5.书写回调图片方法之后的相关工具方法(文件复制,压缩,保存图片等)

 public void copyFile(String oldPath, String newPath) {          try {              int bytesum = 0;              int byteread = 0;              File oldfile = new File(oldPath);            File newfile=new File(newPath);           if(!newfile.exists())           {           newfile.mkdirs();           }           if (oldfile.exists()) {                InputStream inStream = new FileInputStream(oldPath); //读入原文件                  FileOutputStream fs = new FileOutputStream(newPath+"/"+FILE_NAME);                  byte[] buffer = new byte[1024];                  while ( (byteread = inStream.read(buffer)) != -1) {                      bytesum += byteread;                    fs.write(buffer, 0, byteread);                  }                  Log.e("tag", "success!");               inStream.close();                  fs.close();           }          }          catch (Exception e) {              e.printStackTrace();            }      }     public boolean myDeleteFile(String path) { File file=new File(path); if(file.exists()) { file.delete(); return true; }else { return false; } }private int getSuitableSize(int width, int height) {int suitableSize = 16;if(width>height){suitableSize=Math.round(width/128);}else if(height>width) {suitableSize=Math.round(height/128);}else {suitableSize=Math.round(width/128);}return suitableSize;}public void saveBitmap(String filePath,Bitmap bmp) { File file = new File(filePath); if(!file.exists()){file.mkdirs();}try { FileOutputStream out = new FileOutputStream(file+"/"+FILE_NAME); bmp.compress(Bitmap.CompressFormat.PNG, 30, out); out.flush(); out.close(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } 

6.生成自己编写的jar包，并且导出相关的资源文件