android平台 cocos2d-x 读取相册数据

2021-08-07 14:36:47

现已解决方案如下：

1、使用 jni 调用 java 方法启动相册选择框
2、使用java将获取的图片保存到本地
3、使用Cocos2d-x中 CCImage 读取

JAVA代码如下：

//启动图片选择框
   private void launchCamera()
   {
      // TODO Auto-generated method stub
      Intent intent = new Intent();
      intent.setType("image/*");//set intent type
      intent.setAction(Intent.ACTION_GET_CONTENT);

      //取得图片信息返回MainActivity
      startActivityForResult(intent,1);
   }

   //图片选择回调
   protected void onActivityResult(int requestCode,int resultCode,Intent data)
   {
      if(resultCode==RESULT_OK)
      {
            Uri uri = data.getData();

            //通过URI获取图片绝对地址
            String[] proj = { MediaStore.Images.Media.DATA };

            Cursor cursor = managedQuery(uri,proj,null,null,null);

            int actual_image_column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);

            //游标跳到首位，防止越界
            cursor.moveToFirst();

            String img_path = cursor.getString(actual_image_column_index);

            //通过地址获得位图信息
            Bitmap bitmap =BitmapFactory.decodeFile(img_path);

            saveMyBitmap("001", bitmap);

         }

   }

   //保存图片到本地
   private void saveMyBitmap(String bitName,Bitmap mBitmap)
   {
   File f = new File("/sdcard/" + bitName + ".png");
   try {

   f.createNewFile();

   } catch (IOException e) {
   // TODO Auto-generated catch block

   }

   FileOutputStream fOut = null;
   try {

   fOut = new FileOutputStream(f);

   } catch (FileNotFoundException e) {

   e.printStackTrace();
   }

   mBitmap.compress(Bitmap.CompressFormat.PNG, 100, fOut);

   try {

   fOut.flush();

   } catch (IOException e) {

   e.printStackTrace();
   }

   try {

   fOut.close();

   } catch (IOException e) {

   e.printStackTrace();
   }

   }


C++代码如下:

//读取本地存储数据
CCSprite* LoadingLayer::loadImage()
{
CCSprite* tempsprite = NULL;

const char* path = "/sdcard/001.png";
FILE* fp = fopen(path, "rb");
if (!fp)
{
      return tempsprite;
}

fseek(fp,0,SEEK_END);
int len = ftell(fp);
fseek(fp,0,SEEK_SET);
char* buf = (char*)malloc(len);
fread(buf,len,1,fp);
fclose(fp);

if(len==0 || buf==NULL)
{
      return tempsprite;
}

CCImage* img = new CCImage;
img->initWithImageData(buf,len);
free(buf);
cocos2d::CCTexture2D* texture = new cocos2d::CCTexture2D();
texture->initWithImage(img);
img->release();
tempsprite = CCSprite::createWithTexture(texture);
texture->release();

return tempsprite;

}

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