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如何在ListActivity中正确填充来自SQLite的记录？

2010-06-07 65 views
2

有人可以告诉我如何轻松地在ListActivity选项卡中显示来自sqllite的每条记录吗？我有点困惑于此。我是否需要在TabActivity或ListActivity或两者中的助手类中创建数据库？我的数据库辅助类是如下：如何在ListActivity中正确填充来自SQLite的记录？

package tabs.app; 

import android.content.ContentValues; 
import android.content.Context; 
import android.database.Cursor; 
import android.database.SQLException; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteOpenHelper; 
import android.util.Log; 

public class DBAdapter 
{ 

private static String DB_PATH = "/data/data/tabs.app/databases/"; 

    public static final String KEY_ROWID = "_id"; 
    public static final String KEY_LATITUDE = "latitude"; 
    public static final String KEY_LONGITUDE = "longitude"; 
    private static final String TAG = "DBAdapter"; 

    private static final String DATABASE_NAME = "coords"; 
    private static final String DATABASE_TABLE = "coordsStorages"; 
    private static final int DATABASE_VERSION = 2; 

    /* private static final String DATABASE_CREATE = 
     "create table coordsStorage (_id integer primary key autoincrement, latitude integer not null, longitude integer not null)"; 
    */ 
    public Context context; 

    private DatabaseHelper DBHelper; 
    private SQLiteDatabase db; 

    public DBAdapter(Context ctx) 
    { 
     this.context = ctx; 
     DBHelper = new DatabaseHelper(context); 
    } 

    private static class DatabaseHelper extends SQLiteOpenHelper 
    { 
     DatabaseHelper(Context context) 
     { 
      super(context, DATABASE_NAME, null, DATABASE_VERSION); 
     } 

     @Override 
     public void onCreate(SQLiteDatabase db) 
     { 
      db.execSQL("create table coordsStorages (_id integer primary key autoincrement, latitude integer not null, longitude integer not null)"); 
     } 

     @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 titles"); 
      onCreate(db); 
     } 
    }  

    //---opens the database--- 
    public DBAdapter open() throws SQLException 
    { 
     db = DBHelper.getWritableDatabase(); 
     return this; 
    } 

    //---closes the database---  
    public void close() 
    { 
     DBHelper.close(); 
    } 

    //---insert a title into the database--- 
    public long insertCoords(int latitude, int longitude) 
    { 
     ContentValues initialValues = new ContentValues(); 
     initialValues.put(KEY_LATITUDE, latitude); 
     initialValues.put(KEY_LONGITUDE, longitude); 
     return db.insert(DATABASE_TABLE, null, initialValues); 
    } 

    public void openDataBase() throws SQLException{ 

     //Open the database 
     String myPath = DB_PATH + DATABASE_NAME; 
     db = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY); 

    } 


    //---deletes a particular title--- 
    public boolean deleteTitle(long rowId) 
    { 
     return db.delete(DATABASE_TABLE, KEY_ROWID + 
      "=" + rowId, null) > 0; 
    } 

    //---retrieves all the titles--- 
    public Cursor getAllTitles() 
    { 
     return db.query(DATABASE_TABLE, new String[] { 
      KEY_ROWID, 
      KEY_LATITUDE, 
      KEY_LONGITUDE}, 
       null, 
       null, 
       null, 
       null, 
       null); 
    } 

    //---retrieves a particular title--- 
    public Cursor getTitle(long rowId) throws SQLException 
    { 
     Cursor mCursor = 
       db.query(true, DATABASE_TABLE, new String[] { 
        KEY_ROWID, 
        KEY_LATITUDE, 
        KEY_LONGITUDE}, 
        KEY_ROWID + "=" + rowId, 
        null, 
        null, 
        null, 
        null, 
        null); 
     if (mCursor != null) { 
      mCursor.moveToFirst(); 
     } 
     return mCursor; 
    } 

    //---updates a title--- 
    /*public boolean updateTitle(long rowId, int latitude, 
    int longitude) 
    { 
     ContentValues args = new ContentValues(); 
     args.put(KEY_LATITUDE, latitude); 
     args.put(KEY_LONGITUDE, longitude); 
     return db.update(DATABASE_TABLE, args, 
         KEY_ROWID + "=" + rowId, null) > 0; 
    }*/ 
} 

And Im trying to retrieve the records in TabActivity like this: 

public class Areas extends ListActivity { 

DBAdapter db; 
SimpleCursorAdapter mAdapter; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.areas_layout); 

      db = new DBAdapter(this); 
      db.open(); 
      Cursor c = db.getAllTitles(); 
      startManagingCursor(c); 

      String[] display = new String[] { db.KEY_LATITUDE };  
      int[] to = new int[] { R.id.row_latitude}; 
     /* 
      String[] display2 = new String[] { db.KEY_LONGITUDE };  
      int[] to2 = new int[] { R.id.row_longitude};*/ 

      mAdapter = new SimpleCursorAdapter(this, R.layout.areas_layout, c, display, to); 
      setListAdapter(mAdapter); 

     /* mAdapter2 = new SimpleCursorAdapter(this, R.layout.areas_layout, c, display2, to2); 
      setListAdapter(mAdapter2);*/ 

      db.close(); 



} 
/* 
private void fillData() { 

    // Get all of the rows from the database and create the item list 
    Cursor c = db.getAllTitles(); 
    startManagingCursor(c); 


}*/ 

}

每当我试图做到这一点的错误日志输出这样的：

06-07 09:51:56.529: 
ERROR/AndroidRuntime(2034): Uncaught 
handler: thread main exiting due to 
uncaught exception 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034): 
java.lang.RuntimeException: Unable to 
start activity 
ComponentInfo{tabs.app/tabs.app.Areas}: 
java.lang.RuntimeException: Your 
content must have a ListView whose id 
attribute is 'android.R.id.list' 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2401) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.app.ActivityThread.startActivityNow(ActivityThread.java:2242) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.app.LocalActivityManager.moveToState(LocalActivityManager.java:127) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.app.LocalActivityManager.startActivity(LocalActivityManager.java:339) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:631) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.widget.TabHost.setCurrentTab(TabHost.java:317) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.widget.TabHost$2.onTabSelectionChanged(TabHost.java:127) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.widget.TabWidget$TabClickListener.onClick(TabWidget.java:346) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.view.View.performClick(View.java:2344) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.view.View.onTouchEvent(View.java:4133) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.view.View.dispatchTouchEvent(View.java:3672) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:850) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent( oneWindow.java:1712) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1202) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.app.Activity.dispatchTouchEvent(Activity.java:1987) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent( oneWindow.java:1696) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.view.ViewRoot.handleMessage(ViewRoot.java:1658) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.os.Handler.dispatchMessage(Handler.java:99) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.os.Looper.loop(Looper.java:123) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.app.ActivityThread.main(ActivityThread.java:4203) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
java.lang.reflect.Method.invokeNative(Native 
Method) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
java.lang.reflect.Method.invoke(Method.java:521) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
dalvik.system.NativeStart.main(Native 
Method) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034): Caused by: 
java.lang.RuntimeException: Your 
content must have a ListView whose id 
attribute is 'android.R.id.list' 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.app.ListActivity.onContentChanged(ListActivity.java:236) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:316) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.app.Activity.setContentView(Activity.java:1620) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
tabs.app.Areas.onCreate(Areas.java:18) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  at 
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364) 

06-07 09:51:56.559: 
ERROR/AndroidRuntime(2034):  ... 30 
more 

06-07 09:51:56.619: INFO/Process(51): 
Sending signal. PID: 2034 SIG: 3 

06-07 09:51:56.619: 
INFO/dalvikvm(2034): threadid=7: 
reacting to signal 3 

06-07 09:51:56.619: 
ERROR/dalvikvm(2034): Unable to open 
stack trace file 
'/data/anr/traces.txt': Permission 
denied

有人可以告诉我什么，我做错了吗？非常感谢！

来源

2010-06-07 Pavel

回答

1 
java.lang.RuntimeException: Your 
content must have a ListView whose id 
attribute is 'android.R.id.list'

这个错误是抱怨你的视图文件（R.layout.areas_layout）中的ListView没有被赋予正确的ID。你的ListView XML必须是这样的：

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

尝试这样做，看看它是否解决您的问题：

****************编辑*** ***********************************

感谢您分享您的布局代码，问题似乎是因为您的列表行xml布局与主内容视图位于同一个布局文件中。你需要让他们分开。

在你R.layout.areas_layout文件只是你的LinearLayout，然后你的列表视图为您排一个单独的XML文件，这将是这个样子：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    > 
    <TextView 
    android:id="@+id/row_latitude" 
    android:layout_width="wrap_content" 
    android:layout_height="fill_parent" 
    /> 
</LinearLayout>

你会再通过列表行您SimpleCursorAdapter：

mAdapter = new SimpleCursorAdapter(this, R.layout.my_list_row, c, display, to);

来源

2010-06-07 09:15:39 m6tt

1

好，我解决我添加列表视图的问题和布局是这样的：

<TextView android:id="@+id/row_latitude" android:layout_width="wrap_content" android:layout_height="fill_parent" /> 

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

所以基本上textView是上面的listview。 Thx帮助队友！

来源

2010-06-07 09:40:14 Pavel

+0

看到我上面编辑的职位。保持列表行xml与ListView所在的内容视图是分开的，这是一种很好的做法。很高兴您能够对它进行排序，祝您好运 – m6tt 2010-06-07 09:42:50

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