android获取图片尺寸的两种方式及bitmap的缩放操作

 //Uri.parse("file://"+result.getImage().getCompressPath()))
  String path=uri.getPath();
  Log.e("图片路径",path+"");
  SpannableString spannableString=new SpannableString(path);
  //方法一：通过uri把图片转化为bitmap的方法
  Bitmap bitmap= BitmapFactory.decodeFile(path);
  int height= bitmap.getHeight();
  int width= bitmap.getWidth();
  Log.e("通过bitmap获取到的图片大小","width:"+width+"height"+height);
  //方法二：使用Options类来获取
  BitmapFactory.Options options = new BitmapFactory.Options();
  options.inJustDecodeBounds = true;//这个参数设置为true才有效，
  Bitmap bmp = BitmapFactory.decodeFile(path, options);//这里的bitmap是个空
  if(bmp==null){
   Log.e("通过options获取到的bitmap为空","===");
  }
  int outHeight=options.outHeight;
  int outWidth= options.outWidth;
  Log.e("通过Options获取到的图片大小","width:"+outWidth+"height"+outHeight);

 Bitmap bitmap=null;
  BitmapFactory.Options options=new BitmapFactory.Options();
  options.inSampleSize=2;
  options.inJustDecodeBounds = false;
  if(path.equals("a1")){
   bitmap=BitmapFactory.decodeResource(getResources(),R.drawable.a1,options);

public static int[] getImageWidthHeight(String path){
 BitmapFactory.Options options = new BitmapFactory.Options();

 /**
  * 最关键在此，把options.inJustDecodeBounds = true;
  * 这里再decodeFile()，返回的bitmap为空，但此时调用options.outHeight时，已经包含了图片的高了
  */
 options.inJustDecodeBounds = true;
 Bitmap bitmap = BitmapFactory.decodeFile(path, options); // 此时返回的bitmap为null
 /**
  *options.outHeight为原始图片的高
  */
 return new int[]{options.outWidth,options.outHeight};
}