正则表达式匹配图片路径名然后使用DIalog显示

1 if(IMAGE_PATH.matches("[a-zA-Z0-9\\/]*\\.(jpg|JPG|png|PNG|gif|GIF)")){
2                         DialogFragment fragment=ImageDialogFragment.newInstance(getActivity(),IMAGE_PATH);
3                         fragment.show(getActivity().getSupportFragmentManager(),"TAG");
4                     }else {
5                         Toast.makeText(getActivity(),IMAGE_PATH+"不是图片文件路径",Toast.LENGTH_SHORT).show();
6                     }

[a-zA-Z0-9\\/]*\\.(jpg|JPG|png|PNG|gif|GIF)

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout
 3     android:layout_width="wrap_content"
 4     android:layout_height="wrap_content"
 5     xmlns:android="http://schemas.android.com/apk/res/android"
 6     android:gravity="center">
 7     <ImageView
 8         android:id="@+id/show_image"
 9         android:contentDescription="@string/app_name"
10         android:layout_width="wrap_content"
11         android:layout_height="wrap_content"/>
12 </RelativeLayout>

 1 @Override
 2 public Dialog onCreateDialog(Bundle savedInstanceState) {
 3 
 4     View v=mLayoutInflater.inflate(R.layout.dialog_show_image,null);
 5 
 6     ImageView showImage=(ImageView)v.findViewById(R.id.show_image);
 7     Bitmap bm= BitmapFactory.decodeFile(PATH_IMAGE);
 8     showImage.setImageBitmap(bm);
 9 
10     AlertDialog.Builder builder=new AlertDialog.Builder(getActivity());
11     builder.setView(v)
12             .setPositiveButton(R.string.fire, new DialogInterface.OnClickListener() {
13                 @Override
14                 public void onClick(DialogInterface dialog, int which) {
15                     //
16                 }
17             })
18     .setTitle(PATH_IMAGE);
19     return builder.create();
20 }