我沒有看到你遇到問題的地方。如果你有你的BaseAdapter
版本在Activity
A然後你可以簡單地調用(在OnCLickListener
爲你的BaseAdapter
的getView
方法來設置該行的項目),你在A Activity
創建一個私有方法:
private void showADialog(int position) {
new AlertDialog.Builder(this)
.setMessage("The clicked row is " + position)
.setPositiveButton("Ok?",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
dialog.dismiss();
}
}).show();
}
如果您的自定義BaseAdapter
與Activity
A不在同一個文件中,那麼您可以使用傳遞給BaseAdapter
的Context
(如果適配器的代碼是上一個問題中的代碼,那麼您應該將它傳入構造函數)。然後,您可以將該Context
投射到您的活動中,並調用以前的方法showADialog()
。再次
//...
item.setTag(new Integer(position)); // or if you use a ViewHolder: holder.item bla.....
item.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Integer realPosition = (Integer) v.getTag();
// Here show the dialog using one of the methods above.You either:
// showADialog(realPosition); // when the code for your custom BaseAdapter in in the same class as Activity A
//((CallingAlertDialogBaseAdapter) context).showADialog(realPosition); // when the code for the custom BaseAdapter is in a separate file then Activity A
//create directly an AlertDialog. For this you'll require a valid Context(from an Activity(getApplicationCOntext() will NOT work).
//You have this context from the parameter that you pass in the constructor of your custom BaseAdapter(as you ussualy pass this in the Activity where you instantiate the adapter)
}
});
//...
感謝:此外,當您設定的聽衆,你應該通過
position
的標籤,所以你可以在OnCLickListener
找回它(否則你會得到錯誤的位置的看法+聽者得到回收)。是的,它和我的其他帖子是一樣的代碼。我最終爲我的History類添加了'BaseAdapter',因爲'mContext'導致了'NullPointerException' - 我的'DialogInterface'在一個單獨的類中,我試圖通過通過'History'' Activity'類'BaseAdapter'。 – gatzkerob