ListActivity不会在ListView中显示任何条目
这似乎是一个经常遇到的问题，但无法找到我所提供的解决方案。
所以我有一个Activity，它扩展了ListActivity及其中的以下代码：
super.onCreate(savedInstanceState);
db = SQLiteDatabase.openDatabase(playersDatabaseName, null, SQLiteDatabase.CREATE_IF_NECESSARY | SQLiteDatabase.OPEN_READWRITE);
SQLStatement = "create table if not exists Players_And_Scores(_id integer primary key autoincrement, Player String, Score String);";
db.execSQL(SQLStatement);
cv.put("Player", WelcomeActivity.playersName);
cv.put("Score", GameActivity.currentScore);
try
{
db.insertOrThrow("Players_And_Scores", null, cv);
}
catch (Exception e)
{
Log.i("SQLiteException", cv.toString() + " is there already");
}
c = db.query("Players_And_Scores", null, null, null, null, null, null, null);
SimpleCursorAdapter adapter = new SimpleCursorAdapter(getApplicationContext(), android.R.layout.simple_list_item_1,
c, new String[] {"Player", "Score"}, new int[] {android.R.id.text1}, 0);
this.setListAdapter(adapter);
这会设置一个列表视图，每次添加条目时，都会在数据库中添加一个新行，并将新行添加到listwiev。但是所有的线都是空的。所以它识别行数，但不识别内容。
我在想是否应该向xml添加一些东西，所以我一直在玩它而没有结果。 这是我目前用于xml的内容：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<!-- the android:id is important -->
<ListView
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
</LinearLayout>
任何想法都将不胜感激。
修改 这是logcat：
04-23 03:05:16.083 3332-3332/statesgame.app D/dalvikvm﹕ Not late-enabling CheckJNI (already on)
04-23 03:05:16.193 3332-3332/statesgame.app I/can read﹕ true
04-23 03:05:16.193 3332-3332/statesgame.app I/this﹕ State Capital
04-23 03:05:16.193 3332-3332/statesgame.app I/this﹕ ---------------- ---------------
04-23 03:05:16.193 3332-3332/statesgame.app I/this﹕ Alabama Montgomery
State=Wyoming
04-23 03:05:16.473 3332-3332/statesgame.app I/SQLiteException﹕ Capital=Cheyenne State=Wyoming is there already
04-23 03:05:16.483 3332-3332/statesgame.app I/db﹕ []
04-23 03:05:16.513 3332-3332/statesgame.app D/dalvikvm﹕ GC_FOR_ALLOC freed 485K, 16% free 3261K/3856K, paused 5ms, total 13ms
04-23 03:05:16.533 3332-3332/statesgame.app D/﹕ HostConnection::get() New Host Connection established 0xb88f79f0, tid 3332
04-23 03:05:16.573 3332-3332/statesgame.app W/EGL_emulation﹕ eglSurfaceAttrib not implemented
04-23 03:05:16.573 3332-3332/statesgame.app D/OpenGLRenderer﹕ Enabling debug mode 0
04-23 03:05:17.453 3332-3332/statesgame.app D/dalvikvm﹕ GC_FOR_ALLOC freed 52K, 15% free 3298K/3856K, paused 3ms, total 4ms
04-23 03:05:17.453 3332-3332/statesgame.app I/enteract﹕ act
04-23 03:05:17.533 3332-3332/statesgame.app W/EGL_emulation﹕ eglSurfaceAttrib not implemented
04-23 03:05:18.813 3332-3332/statesgame.app I/buttn﹕ Click
04-23 03:05:18.813 3332-3332/statesgame.app I/cursorEntirs﹕ 3
04-23 03:05:18.813 3332-3332/statesgame.app I/cCount﹕ 50
04-23 03:05:19.143 3332-3332/statesgame.app I/buttn﹕ Click
04-23 03:05:19.143 3332-3332/statesgame.app I/cursorEntirs﹕ 33
04-23 03:05:19.143 3332-3332/statesgame.app I/cCount﹕ 50
04-23 03:05:19.313 3332-3332/statesgame.app I/buttn﹕ Click
04-23 03:05:19.313 3332-3332/statesgame.app I/cursorEntirs﹕ 34
04-23 03:05:19.313 3332-3332/statesgame.app I/cCount﹕ 50
04-23 03:05:19.483 3332-3332/statesgame.app I/buttn﹕ Click
04-23 03:05:19.483 3332-3332/statesgame.app I/cursorEntirs﹕ 5
04-23 03:05:19.483 3332-3332/statesgame.app I/cCount﹕ 50
04-23 03:05:19.623 3332-3332/statesgame.app I/buttn﹕ Click
04-23 03:05:19.623 3332-3332/statesgame.app I/cursorEntirs﹕ 2
04-23 03:05:19.623 3332-3332/statesgame.app I/cCount﹕ 50
04-23 03:05:19.743 3332-3332/statesgame.app I/buttn﹕ Click
04-23 03:05:19.893 3332-3332/statesgame.app I/buttn﹕ Click
04-23 03:05:20.063 3332-3332/statesgame.app I/buttn﹕ Click
04-23 03:05:20.213 3332-3332/statesgame.app I/buttn﹕ Click
04-23 03:05:20.533 3332-3332/statesgame.app I/buttn﹕ Click
04-23 03:05:20.763 3332-3332/statesgame.app I/buttn﹕ Click
04-23 03:05:20.793 3332-3332/statesgame.app D/dalvikvm﹕ GC_FOR_ALLOC freed 30K, 13% free 3427K/3896K, paused 2ms, total 3ms
04-23 03:05:20.793 3332-3332/statesgame.app D/dalvikvm﹕ GC_FOR_ALLOC freed 5K, 12% free 3520K/3996K, paused 2ms, total 2ms
04-23 03:05:20.803 3332-3332/statesgame.app I/dalvikvm-heap﹕ Grow heap (frag case) to 4.618MB for 1127532-byte allocation
04-23 03:05:20.823 3332-3341/statesgame.app D/dalvikvm﹕ GC_FOR_ALLOC freed <1K, 10% free 4621K/5100K, paused 21ms, total 21ms
04-23 03:05:20.873 3332-3332/statesgame.app W/EGL_emulation﹕ eglSurfaceAttrib not implemented
04-23 03:09:38.607 3439-3439/statesgame.app D/AndroidRuntime﹕ Shutting down VM
04-23 03:09:38.607 3439-3439/statesgame.app W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0xb2ce5b20)
04-23 03:09:38.607 3439-3439/statesgame.app E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: statesgame.app, PID: 3439
java.lang.RuntimeException: Unable to instantiate application android.app.Application: java.lang.IllegalStateException: Unable to get package info for statesgame.app; is package not installed?
at android.app.LoadedApk.makeApplication(LoadedApk.java:516)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4317)
at android.app.ActivityThread.access$1500(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalStateException: Unable to get package info for statesgame.app; is package not installed?
at android.app.LoadedApk.initializeJavaContextClassLoader(LoadedApk.java:376)
at android.app.LoadedApk.getClassLoader(LoadedApk.java:329)
at android.app.LoadedApk.makeApplication(LoadedApk.java:508)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4317)
at android.app.ActivityThread.access$1500(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
04-23 03:09:39.737 3468-3468/statesgame.app D/dalvikvm﹕ Not late-enabling CheckJNI (already on)
04-23 03:09:39.787 3468-3468/statesgame.app I/can read﹕ true
04-23 03:09:39.797 3468-3468/statesgame.app I/this﹕ State Capital
04-23 03:09:39.797 3468-3468/statesgame.app I/this﹕ ---------------- ---------------
04-23 03:09:39.797 3468-3468/statesgame.app I/this﹕ Alabama Montgomery
04-23 03:09:39.817 3468-3468/statesgame.app D/dalvikvm﹕ GC_FOR_ALLOC freed 109K, 7% free 3230K/3448K, paused 18ms, total 19ms
04-23 03:09:39.827 3468-3468/statesgame.app I/SQLiteException﹕ Capital=Montgomery State=Alabama is there already
04-23 03:10:05.507 3468-3468/statesgame.app D/dalvikvm﹕ GC_FOR_ALLOC freed 75K, 12% free 3428K/3892K, paused 3ms, total 3ms
04-23 03:10:05.507 3468-3468/statesgame.app D/dalvikvm﹕ GC_FOR_ALLOC freed 8K, 12% free 3518K/3992K, paused 2ms, total 2ms
04-23 03:10:05.507 3468-3468/statesgame.app I/dalvikvm-heap﹕ Grow heap (frag case) to 4.616MB for 1127532-byte allocation
04-23 03:10:05.527 3468-3477/statesgame.app D/dalvikvm﹕ GC_FOR_ALLOC freed <1K, 10% free 4619K/5096K, paused 13ms, total 13ms
04-23 03:10:05.577 3468-3468/statesgame.app W/EGL_emulation﹕ eglSurfaceAttrib not implemented
04-23 03:18:27.315 3575-3575/statesgame.app W/EGL_emulation﹕ eglSurfaceAttrib not implemented
04-23 03:18:29.785 3575-3575/statesgame.app D/dalvikvm﹕ GC_FOR_ALLOC freed 276K, 11% free 3456K/3844K, paused 3ms, total 3ms
04-23 03:18:29.785 3575-3575/statesgame.app D/dalvikvm﹕ GC_FOR_ALLOC freed 36K, 11% free 3518K/3944K, paused 2ms, total 3ms
04-23 03:18:29.785 3575-3575/statesgame.app I/dalvikvm-heap﹕ Grow heap (frag case) to 4.616MB for 1127532-byte allocation
04-23 03:18:29.805 3575-3584/statesgame.app D/dalvikvm﹕ GC_FOR_ALLOC freed <1K, 9% free 4619K/5048K, paused 12ms, total 12ms
04-23 03:18:29.875 3575-3575/statesgame.app W/EGL_emulation﹕ eglSurfaceAttrib not implemented
修改 添加了清单：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="statesgame.app" >
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="statesgame.app.WelcomeActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="statesgame.app.GameActivity"
android:label="@string/title_activity_game" >
</activity>
<activity
android:name="statesgame.app.ScoresActivity"
android:label="@string/title_activity_scores" >
</activity>
</application>
</manifest>
我以这种方式开始我的活动：
Intent intent = new Intent(getApplicationContext(), ScoresActivity.class);
startActivity(intent);
2 个答案:
答案 0 :(得分：0)
试试如下：
Cursor cursor = db.query("Players_And_Scores", new String[]
{"Player","Score"}, null, null, null);
startManagingCursor(cursor);
// THE DESIRED COLUMNS TO BE BOUND
String[] columns = new String[] { "Player", "Score"};
SimpleCursorAdapter adapter = new SimpleCursorAdapter(getApplicationContext(), android.R.layout.simple_expandable_list_item_2,
cursor , columns, new int[] {android.R.id.text1,android.R.id.text2}, 0);
希望这对你有用。
答案 1 :(得分：0)
我找到了解决方案。很奇怪，我只是将我的光标对象更改为：
c = db.query("Players_And_Scores", new String[]{"_id", "Player", "Score"}, null, null, null, null, null, null);
添加我的数据库的所有行显式解决了问题，但遗憾的是只显示了一个条目"Players"。为了在ListView行中放置更多条目，我可能需要创建一个自定义适配器。
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