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我一直在这个错误上一段时间了。我试图在我的对话框中打开一个列表视图，但它没有为我打开这是我的代码。

LOGCAST

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.mybasicapp"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".Slashscreen"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".menu"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MENU" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".tutorialsone"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="com.mybasicapp.TUTORIALSONE" />
                <category android:name="android.intent.category.DEFAULT" />

Java代码：

   public class menu extends Activity{


Button ImagebuttonOpenDialog;

 String KEY_TEXTPSS = "TEXTPSS";
 static final int CUSTOM_DIALOG_ID = 0;

 ListView dialog_ListView;

 String[] listContent = {
   "January", "February", "March", "April",
   "May", "June", "July", "August", "September",
   "October", "November", "December"};


protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    ImagebuttonOpenDialog = (Button)findViewById(R.id.imgbtn1);
    ImagebuttonOpenDialog.setOnClickListener(new Button.OnClickListener(){

        public void onClick(View arg0) {
            showDialog(CUSTOM_DIALOG_ID);
           }});

            }

         @Override
         protected Dialog onCreateDialog(int id) {

          Dialog dialog = null;

          switch(id) {
             case CUSTOM_DIALOG_ID:
              dialog = new Dialog(menu.this);
              dialog.setContentView(R.layout.custom);
              dialog.setTitle("Custom Dialog");

              dialog.setCancelable(true);
              dialog.setCanceledOnTouchOutside(true);

              dialog.setOnCancelListener(new OnCancelListener(){

            public void onCancel(DialogInterface dialog) {
             // TODO Auto-generated method stub
             Toast.makeText(menu.this,
               "OnCancelListener",
               Toast.LENGTH_LONG).show();
            }});

              dialog.setOnDismissListener(new OnDismissListener(){

            public void onDismiss(DialogInterface dialog) {
             // TODO Auto-generated method stub
             Toast.makeText(menu.this,
               "OnDismissListener",
               Toast.LENGTH_LONG).show();
            }});

              //Prepare ListView in dialog
              dialog_ListView = (ListView)dialog.findViewById(R.id.dialoglist);
              ArrayAdapter<String> adapter
               = new ArrayAdapter<String>(this,
                 android.R.layout.simple_list_item_1, listContent);
              dialog_ListView.setAdapter(adapter);
              dialog_ListView.setOnItemClickListener(new OnItemClickListener(){

            public void onItemClick(AdapterView<?> parent, View view,
              int position, long id) {
             // TODO Auto-generated method stub
             Toast.makeText(menu.this,
               parent.getItemAtPosition(position).toString() + " clicked",
               Toast.LENGTH_LONG).show();
             dismissDialog(CUSTOM_DIALOG_ID);
            }});

                 break;
             }

          return dialog;
         }

         @Override
         protected void onPrepareDialog(int id, Dialog dialog, Bundle bundle) {
          // TODO Auto-generated method stub
          super.onPrepareDialog(id, dialog, bundle);

          switch(id) {
             case CUSTOM_DIALOG_ID:
              //
                 break;
             }

         }

        }

活动主xml

   <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
     android:layout_height="match_parent"
   android:background="@drawable/carbon" >

<FrameLayout
    android:id="@+id/frameLayout1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="0dp"
    android:background="@drawable/bottombar" >
</FrameLayout>

<ImageButton
    android:id="@+id/imgbtn1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:layout_marginLeft="42dp"
    android:layout_marginTop="79dp"
    android:src="@android:drawable/btn_star" />

<ImageButton
    android:id="@+id/imgbtn2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:layout_alignTop="@+id/imgbtn1"
    android:layout_marginRight="46dp"
    android:src="@android:drawable/btn_star" />

<ImageButton
    android:id="@+id/imageButton3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/imgbtn1"
    android:layout_below="@+id/imgbtn1"
    android:layout_marginTop="36dp"
    android:src="@android:drawable/btn_star" />

<ImageButton
    android:id="@+id/imageButton4"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/imgbtn2"
    android:layout_alignTop="@+id/imageButton3"
    android:src="@android:drawable/btn_star" />

<ImageButton
    android:id="@+id/imageButton5"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/imageButton3"
    android:layout_below="@+id/imageButton3"
    android:layout_marginTop="49dp"
    android:src="@android:drawable/btn_star" />

<ImageButton
    android:id="@+id/imageButton6"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/imageButton4"
    android:layout_alignTop="@+id/imageButton5"
    android:src="@android:drawable/btn_star" />

<ImageButton
    android:id="@+id/imageButton7"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/imageButton5"
    android:layout_below="@+id/imageButton5"
    android:layout_marginTop="42dp"
    android:src="@android:drawable/btn_star" />

<ImageButton
    android:id="@+id/imageButton8"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/imageButton6"
    android:layout_alignTop="@+id/imageButton7"
    android:src="@android:drawable/btn_star" />

<ImageView
    android:id="@+id/imageView11"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:src="@drawable/kj" />

自定义.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/customdialog"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="20dp"
android:minWidth="300dp">
<ImageView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/ic_launcher"/>

<ListView
    android:id="@+id/dialoglist"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />

<ImageButton
    android:id="@+id/imageButton1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/kj" />

</LinearLayout>

另外我再次查看了java代码，发现我的代码有（按钮）在我的XML中有图像按钮我已经更改了我的java代码，所以你可以看到我现在在哪里......仍然没有运气。我没有知道如何复制日志转换

4

1 回答 1

0

据我计算，当您尝试添加 a 时，buttonOpenDialog您null会得到这样的结果。检查您的id 是否为. 您可能拼错了 id 或者那个 id 根本不存在于您的. 如果您没有发现问题，请发布.NPElisteneractivity_mainButtonim1layoutactivity_main.xml

此外，这不是您的问题，但您应该考虑使用 Java 标准命名约定。类名应以大写字母开头。因此，您将拥有Main而不是main作为您的班级名称。

当您发布问题时，请在您的问题中发布 logcat，因为它总是让会员更容易阅读，然后需要点击有时质量不高的链接。

于 2013-05-13T01:04:30.180 回答