Android：列表視圖不填充從數據庫中獲取的數據

我想通過使用光標從SQLite中獲取數據來填充列表視圖。但每次關閉應用程序突然顯示「不幸的是停止」Android：列表視圖不填充從數據庫中獲取的數據

這裏是一個簡單的代碼：

public class MainActivity extends ListActivity { 

//Android listview object 
ListView listViewPhoneBook; 

/** Called when the activity is first created. */ 

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

    ListView listContent = (ListView) findViewById(R.id.listPhoneBook); 
    DbAdapter mDb = new DbAdapter(this); 
    mDb.open(); 

    Cursor cursor =mDb.fetchAllPrograms(); 
    startManagingCursor(cursor); 

    String[] from = new String[] { DbAdapter.KEY_TITLE }; 
    int[] to = new int[] { R.id.textViewName }; 

    SimpleCursorAdapter cursorAdapter = new 
SimpleCursorAdapter(this, R.layout.row, cursor, from, to); 

    listContent.setAdapter(cursorAdapter); 



    //Onclick ListView setlistener 
    listContent.setTextFilterEnabled(true); 

    listContent.setOnItemClickListener(new OnItemClickListener() { 
     public void onItemClick(AdapterView<?> parent, View view, 
       int position, long id) { 


     } 

    }); 
    } 
}

XML文件：activity_main.xml中

<?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" 
> 
<ListView 
    android:id="@+id/listPhoneBook" 

    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:dividerHeight="0.1dp" 
    android:divider="#0000CC" 
    > 
    </ListView> 

</LinearLayout>

Row.xml

<?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" 
> 

<TextView 
    android:id="@+id/textViewName" 
    android:layout_marginTop="10dp" 
    android:layout_marginBottom="10dp" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textSize="25dp" 
    android:textColor="#0000FF" 
    android:text="TextView" /> 

</LinearLayout>

數據庫文件：DbAdapter.java

public class DbAdapter{ 


public final static String KEY_TITLE = "title"; 
    public static final String KEY_BODY = "body"; 
    public static final String KEY_ROWID = "_id"; 

    private static final String TAG = "LogoDbAdapter"; 
    private DatabaseHelper mDbHelper; 
    private SQLiteDatabase mDb; 

// Database creation sql statement 


    private static final String DATABASE_NAME = "Logo"; 
    private static final String DATABASE_TABLE = "LogoProgram"; 
    private static final int DATABASE_VERSION = 1; 
private final Context mCtx; 

private static final String TABLE_CREATE = 
     "CREATE TABLE " + DATABASE_TABLE + " (" + 
     KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT," + 
     KEY_TITLE + " TEXT, " + 
     KEY_BODY + " TEXT);"; 

@SuppressLint("SdCardPath") 
private String DATA_PATH="/data/data/com.example/Logo"; 

    private static class DatabaseHelper extends SQLiteOpenHelper{ 

    // Initialize context or database to be used as context 
    DatabaseHelper(Context context) { 
     super(context, DATABASE_NAME, null, DATABASE_VERSION); 
    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 

     db.execSQL(TABLE_CREATE); 


    } 

    //In case of updated version of database is available fire the query 
    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     Log.w(TAG, "Upgrading database from version " + oldVersion + " to " 
       + newVersion + ", which will destroy all old data"); 
     db.execSQL("DROP TABLE IF EXISTS Logoprogram"); 
     onCreate(db); 
    } 
} 


public DbAdapter(Context ctx) { 
    mCtx = ctx; 
} 


public DbAdapter open() throws SQLException { 
    mDbHelper = new DatabaseHelper(mCtx); 
    mDb = mDbHelper.getWritableDatabase(); 

    return this; 
} 

public void close() { 
    mDbHelper.close(); 
} 



public long createProgram(String title, String body) { 
    ContentValues initialValues = new ContentValues(); 
    initialValues.put(KEY_TITLE, title); 
    initialValues.put(KEY_BODY, body); 

    return mDb.insert(DATABASE_TABLE, null, initialValues); 

} 

public String getdata() { 

    String[] columns= new String[]{ KEY_ROWID, KEY_TITLE,KEY_BODY}; 
    Cursor c= mDb.query(DATABASE_TABLE, columns, null, null, null, null, null); 
    String result=""; 

    int id=c.getColumnIndex(KEY_ROWID); 
    int iTitle=c.getColumnIndex(KEY_TITLE); 
    int iBody=c.getColumnIndex(KEY_BODY); 

    for(c.moveToFirst(); !c.isAfterLast();c.moveToNext()){ 
     result= result + c.getString(id) + " " + c.getString(iTitle) + 
" "  + c.getString(iBody) + "\n"; 
     //result= result + c.getString(iTitle) + "\n"; 

    } 

    return result; 
} 



public Cursor fetchAllPrograms() { 

    return mDb.query(DATABASE_TABLE, new String[] {KEY_ROWID, KEY_TITLE, 
      KEY_BODY}, null, null, null, null, null); 
} 


public Cursor fetchPrograms(long rowId) throws SQLException { 

    Cursor mCursor = 

     mDb.query(true, DATABASE_TABLE, new String[] {KEY_ROWID, 
       KEY_TITLE, KEY_BODY}, KEY_ROWID + "=" + rowId, null, 
       null, null, null, null); 
    if (mCursor != null) { 
     mCursor.moveToFirst(); 
    } 
    return mCursor; 

}}

遊標方法存在棄用警告。誰能告訴我，我哪裏出錯了？在此先感謝！

的日誌如下：

03-03 22:42:46.695: D/AndroidRuntime(555): Shutting down VM 
03-03 22:42:46.695: W/dalvikvm(555): threadid=1: thread exiting with uncaught 
exception (group=0x409961f8) 
03-03 22:42:46.727: E/AndroidRuntime(555): FATAL EXCEPTION: main 
03-03 22:42:46.727: E/AndroidRuntime(555): java.lang.RuntimeException: Unable to start 
activity ComponentInfo{com.android.listview/com.android.listview.MainActivity}: 
java.lang.RuntimeException: Your content must have a ListView whose id attribute is 
'android.R.id.list' 
03-03 22:42:46.727: E/AndroidRuntime(555): at 
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955) 
03-03 22:42:46.727: E/AndroidRuntime(555): at 
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980) 
03-03 22:42:46.727: E/AndroidRuntime(555): at 
android.app.ActivityThread.access$600(ActivityThread.java:122) 
03-03 22:42:46.727: E/AndroidRuntime(555): at 
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146) 
03-03 22:42:46.727: E/AndroidRuntime(555): at 
android.os.Handler.dispatchMessage(Handler.java:99) 
03-03 22:42:46.727: E/AndroidRuntime(555): at android.os.Looper.loop(Looper.java:137) 
03-03 22:42:46.727: E/AndroidRuntime(555): at 
android.app.ActivityThread.main(ActivityThread.java:4340) 
03-03 22:42:46.727: E/AndroidRuntime(555): at 
java.lang.reflect.Method.invokeNative(Native Method) 
03-03 22:42:46.727: E/AndroidRuntime(555): at 
java.lang.reflect.Method.invoke(Method.java:511) 
03-03 22:42:46.727: E/AndroidRuntime(555): at 
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
03-03 22:42:46.727: E/AndroidRuntime(555): at 
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
03-03 22:42:46.727: E/AndroidRuntime(555): at dalvik.system.NativeStart.main(Native 
Method) 
03-03 22:42:46.727: E/AndroidRuntime(555): Caused by: java.lang.RuntimeException: Your 
content must have a ListView whose id attribute is 'android.R.id.list' 
03-03 22:42:46.727: E/AndroidRuntime(555): at 
android.app.ListActivity.onContentChanged(ListActivity.java:243) 
03-03 22:42:46.727: E/AndroidRuntime(555): at 
com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:254) 
03-03 22:42:46.727: E/AndroidRuntime(555): at 
android.app.Activity.setContentView(Activity.java:1835) 
03-03 22:42:46.727: E/AndroidRuntime(555): at 
com.android.listview.MainActivity.onCreate(MainActivity.java:24) 
03-03 22:42:46.727: E/AndroidRuntime(555): at 
android.app.Activity.performCreate(Activity.java:4465) 
03-03 22:42:46.727: E/AndroidRuntime(555): at 
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 
03-03 22:42:46.727: E/AndroidRuntime(555): at 
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919) 
03-03 22:42:46.727: E/AndroidRuntime(555): ... 11 more 
03-03 22:42:49.625: I/Process(555): Sending signal. PID: 555 SIG: 9

來源

2013-03-03 Neha Somani

顯示Logcat輸出。 – 2013-03-03 16:31:13

我看到至少有兩個原因你的代碼不能正常工作。

您在這裏(ListView) findViewById(R.id.textViewName);使用錯誤的ListView ID。它應該是：
```
ListView listContent = (ListView) findViewById(R.id.listPhoneBook); 
```
ListView試圖acccess一個Cursor一個已經關閉，因爲你已經叫mDb.close();。您應該致電onDestroy撥打mDb.close();。

編輯：

由於您使用ListActivity，你應該提供一個ListView ID爲android.R.id.list。更改activity_main.xml：

<ListView 
    android:id="@android:id/list" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:dividerHeight="0.1dp" 
    android:divider="#0000CC" >

而且你MainActivity：

ListView listContent = (ListView) findViewById(android.R.id.list);

來源

2013-03-03 16:44:31

同樣的錯誤：無法啓動活動ComponentInfo {com.android.listview/com.android.listview.MainActivity}：java.lang.RuntimeException：你的內容必須有一個ListView，它的id屬性是'android.R.id.list ' – 2013-03-03 17:32:59

檢查我的更新回答 – 2013-03-03 17:40:05

我認爲你的回答是正確的;但我應該如何處理此錯誤：03-03 23：53：46.236：E/AndroidRuntime（31415）：致命例外：主 03-03 23：53：46.236：E/AndroidRuntime（31415）：java.lang。RuntimeException：無法啓動活動ComponentInfo {com.example.logo/com.example.logo.open}：java.lang.RuntimeException：您的內容必須有一個ListView，其ID參數爲'android.R.id.list' Min SDK = 8和Target SDK = 15。我們需要一些用戶權限嗎？ – 2013-03-03 18:29:10

一個問題，我可以在這裏看到的是這樣的

ListView listContent = (ListView) findViewById(R.id.textViewName);

在XML textViewname是一個TextView，而不是列表顯示。

使用此ListView listContent = (ListView) findViewById(R.id.listPhoneBook);

來源

2013-03-03 16:45:19

我忘了在file :: ListView中修正listContent =（ListView）findViewById（R.id.listPhoneBook） ;但仍然是應用程序突然關閉。 – 2013-03-03 17:27:37

Android：列表視圖不填充從數據庫中獲取的數據

回答

相關問題