Android gridview會在更改方向時保持狀態，但需要更新視圖

Question

我有一個gridview，它根據gridview的大小和col寬度設置視圖，當我們開始時一切都很好，但是當我改變方向時，將重新創建視圖並刷新選中的復選框，這是我不想要的。 我需要保持滾動狀態以及復選框狀態。

這是我在getview中的代碼：

public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder;
            if (convertView == null) {
                holder = new ViewHolder();
                convertView = mInflater.inflate(R.layout.galleryitem, null);
                holder.imageview = (ImageView) convertView.findViewById(R.id.thumbImage);
                holder.checkbox = (CheckBox) convertView.findViewById(R.id.itemCheckBox);

                convertView.setTag(holder);
            } else {
                holder = (ViewHolder) convertView.getTag();
            }
            ImageItem item = images.get(position);
            holder.checkbox.setId(position);
            holder.imageview.setId(position);
            holder.checkbox.setOnClickListener(new OnClickListener() {

                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    CheckBox cb = (CheckBox) v;
                    int id = cb.getId();
                    if (images.get(id).selection) {
                        cb.setChecked(false);
                        images.get(id).selection = false;
                    } else {
                        cb.setChecked(true);
                        images.get(id).selection = true;
                    }
                }
            });
            holder.imageview.setOnClickListener(new OnClickListener() {

                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    int id = v.getId();
                    ImageItem item = images.get(id);
                    Intent intent = new Intent();
                    intent.setAction(Intent.ACTION_VIEW);
                    final String[] columns = { MediaStore.Images.Media.DATA };
                    Cursor imagecursor = getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                            columns, MediaStore.Images.Media._ID + " = " + item.id, null, MediaStore.Images.Media._ID);
                    if (imagecursor != null && imagecursor.getCount() > 0) {
                        imagecursor.moveToPosition(0);
                        String path = imagecursor.getString(imagecursor
                                .getColumnIndexOrThrow(MediaStore.Images.Media.DATA));
                        File file = new File(path);
                        imagecursor.close();
                        intent.setDataAndType(Uri.fromFile(file), "image/*");
                        startActivityForResult(intent, VIEW_IMAGE);
                    }
                }
            });
            // holder.imageview.setImageBitmap(item.img);
            holder.imageview.setLayoutParams(mImageViewLayoutParams);

            // Check the height matches our calculated column width
            if (holder.imageview.getLayoutParams().height != mItemHeight) {
                holder.imageview.setLayoutParams(mImageViewLayoutParams);
            }
            bitmapFromId.DisplayImage(item.id, holder.imageview);
            // holder.imageview.setImageBitmap(item.img);
            holder.checkbox.setChecked(item.selection);
            return convertView;
        }

如果我設置了android：configChanges =“ orientation”，它不會更新網格中的視圖

Answer 1

在androidmanifest.xml的活動中添加項目blew

android:configChanges="orientation|screenSize|keyboardHidden"

Answer 2

將此添加到清單中

<activity
            android:name=".Your_Activity"
            android:configChanges="keyboardHidden|orientation" >

並在Window.onOrientationChange進行更改以更新Java代碼中的視圖

Answer 3

您可以在配置更改前保留狀態，並在更改后恢復狀態。 您可以執行如下所示的類似操作。

/*
 * (non-Javadoc)
 * 
 * @see android.app.Activity#onRestoreInstanceState(android.os.Bundle)
 */
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);
    int scrollTo = savedInstanceState.getInt("firstItem");
    gridView.setSelection(scrollTo);
    setSelectedItem(savedInstanceState.getInt("selectedItem"));//A method to set the selected Item
}


/* (non-Javadoc)
 * @see android.app.Activity#onSaveInstanceState(android.os.Bundle)
 */
@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    int scrollTo = gridView.getFirstVisiblePosition();
    outState.putInt("firstItem", scrollTo);
    int selectedItem = getSelectedImageItem();//A method to retrieve the selected item from the adapter
    outState.putInt("selectedItem", selectedItem);
    /*additionally you can pass the entire collection into the bundle and retrieve it as well 
    using android.app.Activity#onRetainNonConfigurationInstance*/
}

請通過下面的鏈接獲取更多信息，從長遠來看，這將為您提供幫助。

處理運行時配置更改