林很新的Andr​​oid和我试着加载/坚持从我的自定义对话框preference值。目前，这种失败，因为findViewById返回null。就是这样，我（TRY）这样做正确吗？我如何获得我的EditText小部件在code？

Im very new to android and Im trying to load/persist values from my customized DialogPreference. Currently, this fails because findViewById returns null. Is the way I (try) to do it correct? How do I get access to my EditText widgets in the code?

public class AddressDialogPreference extends DialogPreference {

public AddressDialogPreference(Context context, AttributeSet attrs) {
    super(context, attrs);

    setDialogLayoutResource(R.layout.address_dialog);
}

@Override
protected void onBindDialogView(View view) {

    EditText idField = (EditText) view.findViewById(R.id.hostID);
    EditText ipField = (EditText) view.findViewById(R.id.hostIP);

    SharedPreferences pref = getSharedPreferences();
    idField.setText(pref.getString(getKey() + "_id","ExampleHostname"));
    ipField.setText(pref.getString(getKey() + "_ip","192.168.1.1"));

    super.onBindDialogView(view);
}

@Override
protected void onDialogClosed(boolean positiveResult) {

    if(!positiveResult)
        return;

    Dialog myDial = getDialog();
    EditText idField = (EditText) myDial.findViewById(R.id.hostID);
    EditText ipField = (EditText) myDial.findViewById(R.id.hostIP);

    SharedPreferences.Editor editor = getEditor();
    editor.putString(getKey() + "_id",idField.getText().toString());
    editor.putString(getKey() + "_ip",ipField.getText().toString());
}

address_dialog.xml：     

address_dialog.xml:

<TextView
    android:text="Insert IP address"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />
<EditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/hostIP" />

<TextView
    android:text="Insert identifier"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />
<EditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/hostID" />

推荐答案

好吧，我发现它自己。好了，我还是不知道是什么原因造成的错误，但我做了很多改变布局和code，突然它只是工作。我试图恢复到code，我贴在这里，但我无法重现的错误。进出口张贴我的工作code，所以谁运行到这个问题的人，可以用它。

Ok I found it out myself. Well, I still do not know what caused the error, but I did a lot of changes to the layout and code and suddenly it just worked. I tried to revert to the code that I posted here, but I cannot reproduce the error. Im posting my working code, so anybody who runs into this problem, may use it.

这是管理员还可以选择删除这些帖子，因为它可能无法重现错误。

An admin may also choose to delete this post, as it may be not possible to reproduce the error.

下面的布局：

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

<TextView
    android:text="Insert IP address"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />
<EditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/AddressBox" />

<TextView
    android:text="Insert identifier"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />
<EditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/HostnameBox" />
</LinearLayout>

和AddressDialog preference.java：

and the AddressDialogPreference.java:

public class AddressDialogPreference extends DialogPreference {

private EditText ipBox;
private EditText hostBox;

public AddressDialogPreference(Context context, AttributeSet attrs) {
    super(context, attrs);

    setDialogLayoutResource(R.layout.address_dialog);
}

@Override
protected void onBindDialogView(View view) {

    ipBox = (EditText) view.findViewById(R.id.AddressBox);
    hostBox = (EditText) view.findViewById(R.id.HostnameBox);

    SharedPreferences pref = getSharedPreferences();

    hostBox.setText(pref.getString(getKey() + "_host","ExampleHostname"));
    ipBox.setText(pref.getString(getKey() + "_ip","192.168.1.1"));

    super.onBindDialogView(view);
}

@Override
protected void onDialogClosed(boolean positiveResult) {

    if(!positiveResult)
        return;

    SharedPreferences.Editor editor = getEditor();
    editor.putString(getKey() + "_host",hostBox.getText().toString());
    editor.putString(getKey() + "_ip",ipBox.getText().toString());
    editor.commit();

    super.onDialogClosed(positiveResult);
}
}