Android DialogFragment:如何在多个show()调用中保留视图?

时间:2013-01-31 13:59:56

标签: android android-dialogfragment

我有一个使用自定义布局的对话框片段,其中包含非常复杂的View层次结构。对话框片段的代码或多或少类似于以下内容。

public class CardDetailDialog extends DialogFragment { 

    public CardDetailDialog() { 
        setRetainInstance(true);
        setStyle(STYLE_NORMAL, android.R.style.Theme_Light);
    }

    @Override
    public View onCreateView(LayoutInflater inflater,
            ViewGroup container, Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.card_detail_dialog, container, false);
        /* Modify some view objects ... */
        return view;
    }
}

每当我为此对话框片段调用show()方法时,我注意到始终调用onCreateView并重复布局膨胀过程。在我的应用程序中,用户可能希望在会话期间多次显示该对话框,我认为这是低效的。有没有办法在多个show()调用中保持视图/对话框实例?是否可以使用DialogFragment执行此操作,还是必须直接处理Dialog类?

1 个答案:

答案 0 :(得分:1)

使用布尔标志似乎可以解决问题(参见KEY CHANGE)。我重写onCreateDialog,但在onCreateView中使用相同的策略也应该可以工作(保持对你创建的视图的引用)

我仍然遇到一些与方向更改有关的问题,但可能与a different issue

有关
public class LogFragment extends DialogFragment{

private boolean isCreated;  //KEY CHANGE
private Dialog mDialog;     //KEY CHANGE -- to hold onto dialog instance across show()s

public LogFragment() {
    setRetainInstance(true); // This keeps the fields across activity lifecycle
    isCreated = false;       // KEY CHANGE - we create the dialog/view the 1st time
}

@Override
public Dialog onCreateDialog(Bundle inState) {
    if (isCreated) return mDialog;  // KEY CHANGE - don't recreate, just send it back
    View v = View.inflate(getActivity(),R.layout.log_layout,null);
    mDialog = new AlertDialog.Builder(getActivity())
            ...
            .create();
    isCreated = true;  // KEY CHANGE Set the FLAG
    return mDialog;
}