0

我的程序包含一个用于检索数据库数据的列表视图。但代码不起作用。下面给出了 xml 文件和 logcat。请帮助我。我的程序包含一个用于检索数据库数据的列表视图。但代码不起作用。下面给出了xml文件和logcat。请帮助我

package example.showevent1;

import android.app.ListActivity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.widget.SimpleCursorAdapter;
import android.widget.ListView;

class Getclicker  extends ListActivity {
    Intent intent = getIntent();
    String datevalue = intent.getStringExtra(FirstActivity.EXTRA_MESSAGE);
    String Userselectvalue = intent.getStringExtra(FirstActivity.EXTRA_MESSAGE1);
    classdbOpenHelper eventsData1;
    Cursor cursor1;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_first);                        /*String datevalue = date.getText().toString();
        String Userselectvalue = userSelection.getText().toString();

        String showevent = eventsData.getContact(datevalue,Userselectvalue);
        show.setText(showevent);*/

         cursor1 = eventsData1.getContact(datevalue,Userselectvalue);
         String[] fromColumns = {classdbOpenHelper.KEY_EVENT};
         int[] toViews = {R.id.event};
         SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,R.layout.events, cursor1, fromColumns, toViews,0 );
         ListView listView = (ListView) findViewById(android.R.id.list); 
         listView.setAdapter(adapter);
        }

    public void onDestroy() {
        eventsData1.close();
      }

}

activity_first.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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:background="@color/color_1"
    tools:context=".FirstActivity" >

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/editText1"
        android:layout_alignBottom="@+id/editText1"
        android:layout_alignParentRight="true"
        android:text="@string/_add" />

    <TextView
        android:id="@+id/textView4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/button1"
        android:layout_alignTop="@+id/button2"
        android:text="Add Event" />

    <TextView
        android:id="@+id/textView5"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="22dp"
        android:background="#ffffff"
        android:text="" />

    <Button
        android:id="@+id/button3"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/textView5"
        android:layout_alignLeft="@+id/textView5"
        android:layout_marginBottom="22dp"
        android:text="ShowEvent" />

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/button3"
        android:layout_alignLeft="@+id/button3"
        android:layout_marginBottom="17dp"
        android:background="#ffffff"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <Spinner
        android:id="@+id/spinner1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/textView1"
        android:layout_alignParentLeft="true"
        android:layout_marginBottom="16dp"
        android:background="#ffffff"
        android:textColor="#b22924" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/button1"
        android:layout_marginBottom="28dp"
        android:text="@string/select"
        android:textAlignment="gravity"
        android:textColor="#b22924"
        android:textSize="20sp"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/button1"
        android:layout_alignBottom="@+id/button1"
        android:layout_alignRight="@+id/button2"
        android:background="#ffffff"
        android:text="Medium Text"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/spinner1"
        android:layout_alignParentLeft="true"
        android:layout_marginBottom="22dp"
        android:text="Select A Place" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/textView4"
        android:layout_alignLeft="@+id/textView1"
        android:layout_marginBottom="38dp"
        android:text="@string/dt" />
  <ListView android:id="@+id/list"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent" />

</RelativeLayout>

事件.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="6dip" >

    <TextView
        android:id="@+id/event"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView" />
</RelativeLayout>

日志猫

08-07 06:46:14.565: E/AndroidRuntime(3633): FATAL EXCEPTION: main
08-07 06:46:14.565: E/AndroidRuntime(3633): java.lang.RuntimeException: Unable to start activity ComponentInfo{example.showevent1/example.showevent1.FirstActivity}: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
08-07 06:46:14.565: E/AndroidRuntime(3633):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
08-07 06:46:14.565: E/AndroidRuntime(3633):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
08-07 06:46:14.565: E/AndroidRuntime(3633):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
08-07 06:46:14.565: E/AndroidRuntime(3633):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
08-07 06:46:14.565: E/AndroidRuntime(3633):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-07 06:46:14.565: E/AndroidRuntime(3633):     at android.os.Looper.loop(Looper.java:137)
08-07 06:46:14.565: E/AndroidRuntime(3633):     at android.app.ActivityThread.main(ActivityThread.java:5041)
08-07 06:46:14.565: E/AndroidRuntime(3633):     at java.lang.reflect.Method.invokeNative(Native Method)
08-07 06:46:14.565: E/AndroidRuntime(3633):     at java.lang.reflect.Method.invoke(Method.java:511)
08-07 06:46:14.565: E/AndroidRuntime(3633):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
08-07 06:46:14.565: E/AndroidRuntime(3633):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
08-07 06:46:14.565: E/AndroidRuntime(3633):     at dalvik.system.NativeStart.main(Native Method)
08-07 06:46:14.565: E/AndroidRuntime(3633): Caused by: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
08-07 06:46:14.565: E/AndroidRuntime(3633):     at android.app.ListActivity.onContentChanged(ListActivity.java:243)
08-07 06:46:14.565: E/AndroidRuntime(3633):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:273)
08-07 06:46:14.565: E/AndroidRuntime(3633):     at android.app.Activity.setContentView(Activity.java:1881)
08-07 06:46:14.565: E/AndroidRuntime(3633):     at example.showevent1.FirstActivity.onCreate(FirstActivity.java:56)
08-07 06:46:14.565: E/AndroidRuntime(3633):     at android.app.Activity.performCreate(Activity.java:5104)
08-07 06:46:14.565: E/AndroidRuntime(3633):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
08-07 06:46:14.565: E/AndroidRuntime(3633):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
08-07 06:46:14.565: E/AndroidRuntime(3633):     ... 11 more
4

3 回答 3

2

每个 ListActivity 在它的布局定义中都需要一个默认的 ListView id，而不是你的 ListView id：

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

利用 ：

<ListView android:id="@android:id/list"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"/>
于 2013-08-07T06:58:26.263 回答
1

从文档中引用

http://developer.android.com/reference/android/app/ListActivity.html

ListActivity 有一个默认布局，它由屏幕中央的单个全屏列表组成。但是，如果您愿意，您可以通过在 onCreate() 中使用 setContentView() 设置您自己的视图布局来自定义屏幕布局。为此，您自己的视图必须包含一个 ID 为“@android:id/list”的 ListView 对象（如果它在代码中，则为列表）

将以下内容添加到 xml 中的列表视图中

   <ListView android:id="@android:id/list"

初始化列表视图

   ListView listView = getListView();
于 2013-08-07T07:00:07.453 回答
0

改变

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

对此：

<ListView android:id="@id/android:list"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent" />

在您的 XML 文件中。希望能帮助到你。

于 2013-08-07T07:03:58.910 回答