可能重复:
How to use an existing database with an Android application
我必须在android中使用arrayadapter将项目添加到listview,所以完成编码,我的xml布局文件名是“jobs”,但我得到错误,因为“作业无法解决或不是字段”,我已经在清单中列出了这个活动,但仍然是同样的错误
public class Jobs extends ListActivity {
private TextView selection;
private static final String[] items={"Computer Hardware", "Featured", "Information Technology", "Software", "Technical"
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.jobs);
ListView list = (ListView)findViewById(R.id.list);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.jobs, items);
setListAdapter(adapter);
}
public void onListItemClick(ListView parent, View v, int position, long id)
{
selection.setText(items[position]);
}
}
这是xml布局文件
<?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:id="@+id/selection"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<ListView
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
的manifest.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.rebuix.com"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="9"
android:targetSdkVersion="15" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:icon="@drawable/rebuix"
android:label="@string/app_name"
android:theme="@style/AppTheme"
android:background="#3D0909">
<activity
android:name=".LoadingScreen"
android:label="@string/title_activity_loading_screen" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Rebuix"
android:label="@string/title_activity_rebuix" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.rebuix.com.Rebuix" />
</activity>
<activity
android:name=".com.rebuix.com.Jobs"
android:label="@string/app_name" >
</activity>
<activity
android:name=".Login"
android:label="@string/title_activity_login" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.rebuix.com.Rebuix" />
</activity>
<activity
android:name=".About"
android:label="@string/title_activity_about" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="android.support.v4.app.FragmentActivity" />
</activity>
<activity
android:name=".Home"
android:label="@string/title_activity_home" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="android.support.v4.app.FragmentActivity" />
</activity>
<activity
android:name=".Changepassword"
android:label="@string/title_activity_changepassword" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="android.support.v4.app.FragmentActivity" />
</activity>
</application>
</manifest>
logcat输出
01-31 12:31:53.133: I/Tutorial(531): Starting task with url: www.google.co.uk
01-31 12:32:03.972: D/dalvikvm(531): GC_EXTERNAL_ALLOC freed 64K, 52% free 2595K/5379K, external 1645K/2137K, paused 52ms
01-31 12:32:04.102: D/dalvikvm(531): GC_EXTERNAL_ALLOC freed 2K, 52% free 2594K/5379K, external 2687K/3355K, paused 45ms
01-31 12:32:08.083: D/AndroidRuntime(531): Shutting down VM
01-31 12:32:08.083: W/dalvikvm(531): threadid=1: thread exiting with uncaught exception (group=0x40015560)
01-31 12:32:08.103: E/AndroidRuntime(531): FATAL EXCEPTION: main
01-31 12:32:08.103: E/AndroidRuntime(531): android.content.ActivityNotFoundException: Unable to find explicit activity class {com.exm.com/com.exm.com.Jobs}; have you declared this activity in your AndroidManifest.xml?
01-31 12:32:08.103: E/AndroidRuntime(531): at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1405)
01-31 12:32:08.103: E/AndroidRuntime(531): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1379)
01-31 12:32:08.103: E/AndroidRuntime(531): at android.app.Activity.startActivityForResult(Activity.java:2827)
01-31 12:32:08.103: E/AndroidRuntime(531): at android.app.Activity.startActivity(Activity.java:2933)
01-31 12:32:08.103: E/AndroidRuntime(531): at com.rebuix.com.Rebuix$4.onClick(Rebuix.java:69)
01-31 12:32:08.103: E/AndroidRuntime(531): at android.view.View.performClick(View.java:2485)
01-31 12:32:08.103: E/AndroidRuntime(531): at android.view.View$PerformClick.run(View.java:9080)
01-31 12:32:08.103: E/AndroidRuntime(531): at android.os.Handler.handleCallback(Handler.java:587)
01-31 12:32:08.103: E/AndroidRuntime(531): at android.os.Handler.dispatchMessage(Handler.java:92)
01-31 12:32:08.103: E/AndroidRuntime(531): at android.os.Looper.loop(Looper.java:123)
01-31 12:32:08.103: E/AndroidRuntime(531): at android.app.ActivityThread.main(ActivityThread.java:3683)
01-31 12:32:08.103: E/AndroidRuntime(531): at java.lang.reflect.Method.invokeNative(Native Method)
01-31 12:32:08.103: E/AndroidRuntime(531): at java.lang.reflect.Method.invoke(Method.java:507)
01-31 12:32:08.103: E/AndroidRuntime(531): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
01-31 12:32:08.103: E/AndroidRuntime(531): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
01-31 12:32:08.103: E/AndroidRuntime(531): at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分:3)
因为您正在扩展ListActivity
,所以声明ListView与xml中一样:
android:id="@android:id/list"
并将ListView引用作为:
ListView list = (ListView)findViewById(android.R.id.list);
OR
ListView list = this.getListView();
答案 1 :(得分:1)
你的问题是:
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.jobs, items);
setListAdapter(adapter);
删除android:
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
R.layout.jobs, items);
setListAdapter(adapter);
答案 2 :(得分:1)
试试这个
public class Jobs extends ListActivity {
private TextView selection;
private static final String[] items = { "Computer Hardware", "Featured", "Information Technology",
"Software", "Technical"
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.jobs);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, items);
setListAdapter(adapter);
}
public void onListItemClick(ListView parent, View v, int position, long id) {
selection.setText(items[position]);
}
}
<?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:id="@+id/selection"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<ListView
android:id="@android:id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
说明:
1 )所以你在自定义视图中列出的应该是id:android:id =“@ android:id / list”。如果您想将它们添加到 ListActivity 。
2 )您不会将项目映射到列表视图,而是映射到列表项目。所以你必须使用自定义列表项或在添加新的ArrayAdapter(这个,android.R.layout.simple_list_item_1,项目)时使用android默认值;
答案 3 :(得分:0)
而不是
android.R.layout.jobs
使用
R.layout.jobs
答案 4 :(得分:0)
看起来你使用了错误的R类。您将作业定义称为android.R.layout.jobs
(这是Android的R类,可能不包含作业定义)。这应该是<your package>/R.layout.jobs
。
答案 5 :(得分:0)
问题是:android.R.layout.jobs
在
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.jobs, items);
setListAdapter(adapter);
试一试:
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, items);
答案 6 :(得分:0)
当您通过ListActivity扩展活动时,您必须将listview ID声明为@android:id/list
android:id="@android:id/list"
在您的活动中,无需声明列表视图。或者如果你想申报,那么按照以下方式行事
ListView list = (ListView)findViewById(android.R.id.list);
答案 7 :(得分:0)
不是很难注意到错误,当你收到错误时要注意堆栈跟踪。
01-31 12:32:08.103:E / AndroidRuntime(531):android.content.ActivityNotFoundException:无法找到显式活动类{com.exm.com/com.exm.com.Jobs};你有没有在AndroidManifest.xml中声明这个活动?