自定义对话框的EditText返回null [英] Custom Dialog EditText returns null

问题描述

很多人都面临着类似的问题，我想我已经遵循固定在计算器上的所有帖子中提到的所有问题。

Many people have faced similar issues, and I think I have followed and fixed all the issues as mentioned in all those posts on stackoverflow.

• 的setContentView到我的布局


• 与dialog.findViewById初始化的EditText

但我仍然停留在空指针。我缺少什么？

But I am still stuck at the nullpointer. What am I missing ?

布局名称是serverchange.xml。 serverchange.xml的内容

Layout name is serverchange.xml. Contents of serverchange.xml are

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<EditText
    android:id="@+id/server"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:inputType="textUri" />

<TextView
    android:id="@+id/status"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:editable="true" />

</LinearLayout>

是由optionsmenu选择菜单上创建对话框。

Dialog is created on by selecting a menu on optionsmenu.

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle item selection
    switch (item.getItemId()) {
    case R.id.serverChange:
        showDialog(SERVER_CHANGE);
        // newGame();
        return true;
    }
}

我得到一个NullPointerException异常在

I get a NullPointerException at

if (changeServerView == null) throw new NullPointerException() ;

code：

@Override
protected Dialog onCreateDialog(int id) {
    switch (id) {
    case SERVER_CHANGE:
        serverChangeDialog = new Dialog(this);
        serverChangeDialog.setContentView(R.layout.serverchange);
        serverChangeDialog.setTitle("Change Server");
        serverChangeDialog.setOnKeyListener(this);
        serverChangeDialog.show();
        changeServerView = (EditText) serverChangeDialog.findViewById(R.id.serverChange);
        status = (TextView) serverChangeDialog.findViewById(R.id.status);
        if (changeServerView == null) throw new NullPointerException() ;
    }
    return null;
}

我的安其实施

@Override
public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {
    if (dialog == serverChangeDialog) {
        if (keyCode == KeyEvent.KEYCODE_ENTER) {
            String backupServer = server;
            server = changeServerView.getText().toString();

下面嫌我得到一个NullPointerException异常。

Here too I get a NullPointerException.

推荐答案

从XML文件错误ID refrences，

Wrong id refrences from xml file,

使用服务器 而不是 serverChange

changeServerView = (EditText) serverChangeDialog.findViewById(R.id.server);
                                                                   ^^^^^^  

这篇关于自定义对话框的EditText返回null的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！