// 单选      startActivityForResult(ImagePickerActivity.getCallingIntent(MainActivity.this, false), REQ_SINGLE_PICKER);      // 多选      // 也可以 默认多选 startActivityForResult(new Intent(MainActivity.this,ImagePickerActivity.class),REQ_MULTIPLE_PICKER);      startActivityForResult(ImagePickerActivity.getCallingIntent(MainActivity.this, true), REQ_MULTIPLE_PICKER);         @Override      protected void onActivityResult(int requestCode, int resultCode, Intent data) {          super.onActivityResult(requestCode, resultCode, data);            if (requestCode == REQ_MULTIPLE_PICKER && resultCode == RESULT_OK) {              // 获取多选图片的路径数组              ArrayList<String> imgsPath = data.getStringArrayListExtra(ImagePickerActivity.EXTRA_MULTIPLE_PICKER);                gridView.setAdapter(new PreviewAdapter(imgsPath));          } else if (requestCode == REQ_SINGLE_PICKER && resultCode == RESULT_OK) {             // 获取单选图片的路径             // 也可以   ArrayList<String> imgsPath = data.getStringArrayListExtra(ImagePickerActivity.EXTRA_MULTIPLE_PICKER);              String path = data.getStringExtra(ImagePickerActivity.EXTRA_SINGLE_PICKER);                ArrayList<String> imgsPath = new ArrayList<>();              imgsPath.add(path);              gridView.setAdapter(new PreviewAdapter(imgsPath));          }      }