自定义对话框，setContentView 抛出 ResourceNotFoundException

Question

我正在使用this tutorial 创建一个自定义对话框，当我从微调器中单击“创建新文件夹”时应显示该对话框。我进入 OnItemsSelected 方法，检查“创建新文件夹”选项是否已单击，然后我想显示一个对话框来介绍新文件夹的名称。我是这样做的：

res/layout/dialog.html

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/dialog"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:visibility="visible" >

<EditText 
    android:id="@+id/editText_dialog"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:hint="@string/editText_dialog"
    android:layout_alignParentTop="true"
    android:layout_marginTop="15dip"
    android:layout_marginBottom="15dip"/>

<Button 
    android:id="@+id/button_create_dialog"
    android:text="@string/button_create_dialog"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@id/editText_dialog"
    android:layout_alignParentLeft="true"
    android:layout_marginLeft="50dip"
    android:background="#176CEC"
    android:textColor="#fff"
    android:textStyle="bold"
    android:textAppearance="?android:attr/textAppearanceLarge"/>

<Button 
    android:id="@+id/button_cancel_dialog"
    android:text="@string/button_cancel_dialog"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@id/editText_dialog"
    android:layout_alignParentRight="true"
    android:layout_marginRight="50dip"
    android:background="#176CEC"
    android:textColor="#fff"
    android:textStyle="bold"
    android:textAppearance="?android:attr/textAppearanceLarge"/>

</RelativeLayout>

Java 文件

public void onItemSelected(AdapterView<?> parent, View view, int position,long id){
    if (parent.getItemAtPosition(position).toString().matches("Create New Folder")){
        final Dialog dialog = new Dialog(this);
        try {
            dialog.setContentView(R.id.dialog);
            dialog.setTitle("Create New Folder");
        }
        catch (Exception e){
            StringWriter errors = new StringWriter();
            e.printStackTrace(new PrintWriter(errors));
            Log.i("Exception", errors.toString());
        }


        Button createButton = (Button) findViewById(R.id.button_create_dialog);
        Button cancelButton = (Button) findViewById(R.id.button_cancel_dialog);

        createButton.setOnClickListener(new Button.OnClickListener(){
            public void onClick(View v){
                EditText newFolderName = (EditText) findViewById(R.id.editText_dialog);
                String folderName = newFolderName.getText().toString().trim();
                if (folderName.length() > 0) {
                    // do stuff
                    dialog.dismiss();
                }
            }
        });

        cancelButton.setOnClickListener(new Button.OnClickListener(){
            public void onClick(View v){
                dialog.dismiss();
            }
        });
        dialog.show();
    }
}

我收到了 ResourceNotFoundException。这是堆栈跟踪：

11-07 17:11:49.075: I/Exception(8315): android.content.res.Resources$NotFoundException: Resource ID #0x7f05000e
11-07 17:11:49.075: I/Exception(8315):  at android.content.res.Resources.getValue(Resources.java:1118)
11-07 17:11:49.075: I/Exception(8315):  at android.content.res.Resources.loadXmlResourceParser(Resources.java:2304)
11-07 17:11:49.075: I/Exception(8315):  at android.content.res.Resources.getLayout(Resources.java:934)
11-07 17:11:49.075: I/Exception(8315):  at android.view.LayoutInflater.inflate(LayoutInflater.java:395)
11-07 17:11:49.075: I/Exception(8315):  at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
11-07 17:11:49.075: I/Exception(8315):  at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:267)
11-07 17:11:49.075: I/Exception(8315):  at android.app.Dialog.setContentView(Dialog.java:471)
11-07 17:11:49.075: I/Exception(8315):  at com.example.example.MainActivity.onItemSelected(MainActivity.java:94)
11-07 17:11:49.075: I/Exception(8315):  at android.widget.AdapterView.fireOnSelected(AdapterView.java:892)
11-07 17:11:49.075: I/Exception(8315):  at android.widget.AdapterView.access$200(AdapterView.java:49)
11-07 17:11:49.075: I/Exception(8315):  at android.widget.AdapterView$SelectionNotifier.run(AdapterView.java:860)
11-07 17:11:49.075: I/Exception(8315):  at android.os.Handler.handleCallback(Handler.java:730)
11-07 17:11:49.075: I/Exception(8315):  at android.os.Handler.dispatchMessage(Handler.java:92)
11-07 17:11:49.075: I/Exception(8315):  at android.os.Looper.loop(Looper.java:137)
11-07 17:11:49.075: I/Exception(8315):  at android.app.ActivityThread.main(ActivityThread.java:5103)
11-07 17:11:49.075: I/Exception(8315):  at java.lang.reflect.Method.invokeNative(Native Method)
11-07 17:11:49.075: I/Exception(8315):  at java.lang.reflect.Method.invoke(Method.java:525)
11-07 17:11:49.075: I/Exception(8315):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
11-07 17:11:49.075: I/Exception(8315):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
11-07 17:11:49.075: I/Exception(8315):  at dalvik.system.NativeStart.main(Native Method)

可以想象，资源 ID #0x7f05000e 匹配 R.id.dialog，我已经检查过了：

R.java 内部

 public static final int dialog = 0x7f05000e;

知道可能是什么问题吗？

更新 我忘了说在这一行抛出了异常：

dialog.setContentView(R.id.dialog);

Answer 1

发生此错误是因为您尝试在view(s) 上执行findViewById，而不存在于您的Activity 中，但存在于您的对话框中。

更改此代码：

    Button createButton = (Button) findViewById(R.id.button_create_dialog);
    Button cancelButton = (Button) findViewById(R.id.button_cancel_dialog);

收件人：

    Button createButton = (Button) dialog.findViewById(R.id.button_create_dialog);
    Button cancelButton = (Button) dialog.findViewById(R.id.button_cancel_dialog);

那些按钮不在Activity 中，所以你不能只调用findViewById，因为它会尝试在Activity's XML 中查找button's id。相反，调用dialog.findViewById 告诉代码在您的对话框中找到button。

更新（抱歉没有代码标签，我从手机更新）

您应该在 setContentView 方法中使用 R.layout.dialog 而不是 R.id.dialog。