android - 如何从自定义 FirebaseListAdapter 类调用 mainActivity 中的静态方法？

Question

我想使用 Firebase 在 ChatListAdapter 类的 mainActivity 中弹出一个警报 View 。

问题/错误:

com.firebase.androidchat.Main.activity.this cannot be reference from a static context

ChatListAdapter 中的代码:

public class ChatListAdapter extends FirebaseListAdapter<Chat> {

...

protected void populateView(View view, Chat chat) {
...    
    MainActivity.displayAmountPopup();
}

ChatListAdapter 中的代码:

public static void displayAmountPopup(){

....

    new AlertDialog.Builder(MainActivity.this)
            .setTitle(strTitle)
            .setMessage(strAmountMessage)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    Log.d("AlertDialog", "Positive");
                    // Present Acknowledgement View!!!!!!!!!
                    Intent intent = new Intent(MainActivity.this, AcknowledgementActivity.class);
                    startActivity(intent);

                    /*Couldn't work this Error:local variable mContext is accessed from within inner class; needs to be declared final
                    Intent intent = new Intent(mContext, AcknowledgementActivity.class);
                    //startActivity(intent);
                    mContext.startActivity(new Intent(mContext, AcknowledgementActivity.class));*/
                }
            })
            .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    Log.d("AlertDialog", "Negative");
                }
            })
            .show();
}

Answer 1

com.firebase.androidchat.Main.activity.this cannot be reference from a static context

因为无法从 static 方法/ block 访问 MainActivity.this。

要获取用于显示 AlertDialog 的 Context，请将一个 Context 参数添加到 displayAmountPopup 方法:

public static void displayAmountPopup(Context mContext){
....
    new AlertDialog.Builder(mContext)
    ....
}

现在从 populateView 调用时将上下文传递给 displayAmountPopup 方法:

MainActivity.displayAmountPopup(view.getContext());