实现如何Android 获得图片的总结

接下来让我解说一下，实现如何Android 获得图片的总结.

//1，已将图片保存到drawable目录下    //通过图片id获得Drawable    Resource res=gerResource();  Drawable drawable=res.getDrawable(id);//id为R.drawable.图片名称    //通过图片id获得Bitmap    Resource res=gerResource();    Bitmap bitmap=BitmapFactory.decodeResource(res, id);    //若只知道图片的名称，可以通过图片的名称获得图片的id    //name:图片的名称 defType：图片的类型（png,jpeg),defPackage:工程的包名  int id =int id =res.getIdentifier(name, defType, defPackage);  //获得id之后可以根据你的需要来获得Bitmap或Drawable    //2,已将图片保存到assest目录下    //知道图片的名称，通过inputstream打开图片    AssetManager asm=getAssetMg();  InputStream is=asm.open(name);//name:图片的名称  //获得Drawable  Drawable da = Drawable.createFromStream(is, null);  //获得Bitmap  Bitmap bitmap=BitmapFactory.decodeStream(is);    //3,图片保存在sdcard,已知图片的路径    //图片路径  String path = Environment.getExternalStorageDirectory().toString()+ "/DCIM/device.png";  RandomAccessFile mMiniThumbFile；  File imgfile = new File(path);  try {      mMiniThumbFile = new RandomAccessFile(imgfile, "rw");  } catch (IOException ex) {  // Open as read-only so we can at least read the existing  // thumbnails.  try {  mMiniThumbFile = new RandomAccessFile(imgfile, "r");  } catch (IOException ex2) {  // ignore exception  System.out.println(ex2.toString());  }  }  data= new byte[10553];  try {  mMiniThumbFile.seek(0);  int got = mMiniThumbFile.read(data, 0, 10552);  System.out.println("got="+got);  } catch (IOException e) {  // TODO Auto-generated catch block  e.printStackTrace();  System.out.println(e.toString());  }  if (data != null) {  //通过data获得bitmap  Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0,data.length);