彈出dialog 即可：

private void seeBigImg() {
// TODO Auto-generated method stub
imageView.setOnClickListener(new OnClickListener() { // 點選放大
public void onClick(View paramView) {
 LayoutInflater inflater = LayoutInflater.from(UploadImgActivity.this);
 View imgEntryView = inflater.inflate(R.layout.dialog_photo_entry, null); // 載入自定義的佈局檔案
 final AlertDialog dialog = new AlertDialog.Builder(UploadImgActivity.this).create();
 ImageView img1 = (ImageView)imgEntryView.findViewById(R.id.large_image);
 img1.setImageBitmap(bm); 
 dialog.setView(imgEntryView); // 自定義dialog
 dialog.show();
 // 點選佈局檔案（也可以理解為點選大圖）後關閉dialog，這裡的dialog不需要按鈕
 imgEntryView.setOnClickListener(new OnClickListener() {
  public void onClick(View paramView) {
   dialog.cancel();
  }
 });
}
});
}