Android删除项目列表视图和数据库

我有点困在这里了。我可以在listview中删除该项，但从数据库中删除该项时也遇到问题：

我的listview类：

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

        final VorgangDataSource dataSource = new VorgangDataSource(this);

        Log.d(TAG,"Die Datenquelle wird geöffnet!");
        dataSource.open();

        final List<vorgangsdaten> vorgangsdatenList = dataSource.getAllVorgangsDaten();

        final ArrayAdapter<vorgangsdaten> VorgangArrayAdapter = new ArrayAdapter<>(
                this,
                R.layout.mylistlayout,
                vorgangsdatenList
        );

        final ListView lv = (ListView)findViewById(R.id.listView);
        lv.setAdapter(VorgangArrayAdapter);
        lv.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {

                int pos = position;
                long i = id;
                vorgangsdatenList.remove(pos);
                dataSource.deleteRow(i);
                VorgangArrayAdapter.notifyDataSetChanged();

                return false;
            }
        });
        dataSource.close();



        //ActionBar Costumization
        android.support.v7.app.ActionBar ab = getSupportActionBar();
        ab.setIcon(R.drawable.search1);
        ab.setDisplayShowHomeEnabled(true);
        ab.setDisplayUseLogoEnabled(true);
    }
}

public void deleteRow(long id){
        String s_id;
        s_id = String.valueOf(id);
        database.delete(VorgangDbHelper.TABLE_VORGAENGE_LIST,VorgangDbHelper.COLUMN_ID + "="+s_id,null);
    }

  public static final String TABLE_VORGAENGE_LIST = "vorgaenge_list";

    public static final String COLUMN_ID = "_id";

public void deleteRow(long id){
        String s_id;
        s_id = String.valueOf(id);

        database.delete(VorgangDbHelper.TABLE_VORGAENGE_LIST,VorgangDbHelper.COLUMN_ID + " = ?", new String[] { s_id });
    }

来自vorgangdbhelper的表行：

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

        final VorgangDataSource dataSource = new VorgangDataSource(this);

        Log.d(TAG,"Die Datenquelle wird geöffnet!");
        dataSource.open();

        final List<vorgangsdaten> vorgangsdatenList = dataSource.getAllVorgangsDaten();

        final ArrayAdapter<vorgangsdaten> VorgangArrayAdapter = new ArrayAdapter<>(
                this,
                R.layout.mylistlayout,
                vorgangsdatenList
        );

        final ListView lv = (ListView)findViewById(R.id.listView);
        lv.setAdapter(VorgangArrayAdapter);
        lv.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {

                int pos = position;
                long i = id;
                vorgangsdatenList.remove(pos);
                dataSource.deleteRow(i);
                VorgangArrayAdapter.notifyDataSetChanged();

                return false;
            }
        });
        dataSource.close();



        //ActionBar Costumization
        android.support.v7.app.ActionBar ab = getSupportActionBar();
        ab.setIcon(R.drawable.search1);
        ab.setDisplayShowHomeEnabled(true);
        ab.setDisplayUseLogoEnabled(true);
    }
}

public void deleteRow(long id){
        String s_id;
        s_id = String.valueOf(id);
        database.delete(VorgangDbHelper.TABLE_VORGAENGE_LIST,VorgangDbHelper.COLUMN_ID + "="+s_id,null);
    }

  public static final String TABLE_VORGAENGE_LIST = "vorgaenge_list";

    public static final String COLUMN_ID = "_id";

public void deleteRow(long id){
        String s_id;
        s_id = String.valueOf(id);

        database.delete(VorgangDbHelper.TABLE_VORGAENGE_LIST,VorgangDbHelper.COLUMN_ID + " = ?", new String[] { s_id });
    }

我的爱人给了我一个d`oh。那么我做错了什么

编辑：错误消息

05-29 21:43:55.829 7725-7725/com.example/AndroidRuntime: FATAL EXCEPTION: main
                                                                              Process: com.example PID: 7725
                                                                              java.lang.IllegalStateException: attempt to re-open an already-closed object: SQLiteDatabase: /data/data/com.example/databases/vorgaenge_list.db
                                                                                  at android.database.sqlite.SQLiteClosable.acquireReference(SQLiteClosable.java:55)
                                                                                  at android.database.sqlite.SQLiteDatabase.delete(SQLiteDatabase.java:1613)
                                                                                  at com.example.VorgangDataSource.deleteRow(VorgangDataSource.java:75)
                                                                                  at com.example.anzeigen$1.onItemLongClick(anzeigen.java:71)
                                                                                  at android.widget.AbsListView.performLongPress(AbsListView.java:3659)
                                                                                  at android.widget.AbsListView$CheckForLongPress.run(AbsListView.java:3601)
                                                                                  at android.os.Handler.handleCallback(Handler.java:733)
                                                                                  at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                                  at android.os.Looper.loop(Looper.java:146)
                                                                                  at android.app.ActivityThread.main(ActivityThread.java:5679)
                                                                                  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:1291)
                                                                                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
                                                                                  at dalvik.system.NativeStart.main(Native Method)

解决方案：

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

        final VorgangDataSource dataSource = new VorgangDataSource(this);

        Log.d(TAG,"Die Datenquelle wird geöffnet!");
        dataSource.open();

        final List<vorgangsdaten> vorgangsdatenList = dataSource.getAllVorgangsDaten();

        final ArrayAdapter<vorgangsdaten> VorgangArrayAdapter = new ArrayAdapter<>(
                this,
                R.layout.mylistlayout,
                vorgangsdatenList
        );

        final ListView lv = (ListView)findViewById(R.id.listView);
        lv.setAdapter(VorgangArrayAdapter);
        lv.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {

                int pos = position;
                long i = id;
                vorgangsdatenList.remove(pos);
                dataSource.deleteRow(i);
                VorgangArrayAdapter.notifyDataSetChanged();

                return false;
            }
        });
        dataSource.close();



        //ActionBar Costumization
        android.support.v7.app.ActionBar ab = getSupportActionBar();
        ab.setIcon(R.drawable.search1);
        ab.setDisplayShowHomeEnabled(true);
        ab.setDisplayUseLogoEnabled(true);
    }
}

public void deleteRow(long id){
        String s_id;
        s_id = String.valueOf(id);
        database.delete(VorgangDbHelper.TABLE_VORGAENGE_LIST,VorgangDbHelper.COLUMN_ID + "="+s_id,null);
    }

  public static final String TABLE_VORGAENGE_LIST = "vorgaenge_list";

    public static final String COLUMN_ID = "_id";

public void deleteRow(long id){
        String s_id;
        s_id = String.valueOf(id);

        database.delete(VorgangDbHelper.TABLE_VORGAENGE_LIST,VorgangDbHelper.COLUMN_ID + " = ?", new String[] { s_id });
    }

删除行方法：

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

        final VorgangDataSource dataSource = new VorgangDataSource(this);

        Log.d(TAG,"Die Datenquelle wird geöffnet!");
        dataSource.open();

        final List<vorgangsdaten> vorgangsdatenList = dataSource.getAllVorgangsDaten();

        final ArrayAdapter<vorgangsdaten> VorgangArrayAdapter = new ArrayAdapter<>(
                this,
                R.layout.mylistlayout,
                vorgangsdatenList
        );

        final ListView lv = (ListView)findViewById(R.id.listView);
        lv.setAdapter(VorgangArrayAdapter);
        lv.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {

                int pos = position;
                long i = id;
                vorgangsdatenList.remove(pos);
                dataSource.deleteRow(i);
                VorgangArrayAdapter.notifyDataSetChanged();

                return false;
            }
        });
        dataSource.close();



        //ActionBar Costumization
        android.support.v7.app.ActionBar ab = getSupportActionBar();
        ab.setIcon(R.drawable.search1);
        ab.setDisplayShowHomeEnabled(true);
        ab.setDisplayUseLogoEnabled(true);
    }
}

public void deleteRow(long id){
        String s_id;
        s_id = String.valueOf(id);
        database.delete(VorgangDbHelper.TABLE_VORGAENGE_LIST,VorgangDbHelper.COLUMN_ID + "="+s_id,null);
    }

  public static final String TABLE_VORGAENGE_LIST = "vorgaenge_list";

    public static final String COLUMN_ID = "_id";

public void deleteRow(long id){
        String s_id;
        s_id = String.valueOf(id);

        database.delete(VorgangDbHelper.TABLE_VORGAENGE_LIST,VorgangDbHelper.COLUMN_ID + " = ?", new String[] { s_id });
    }

---

请尝试将行

dataSource.close（）

移到

onDestroy（）方法中。问题是您在
onCreate（）
中关闭了数据库

并将删除方法更新为：
database.delete（VorgangDbHelper.TABLE_VORGAENGE_列表，VorgangDbHelper.COLUMN_ID+“=？”，新字符串[]{s_ID}）
请尝试将行
dataSource.close（）
移到
ondestory（）方法中。问题是您在
onCreate（）
中关闭了数据库

并将删除方法更新为：
database.delete（VorgangDbHelper.TABLE_VORGAENGE_列表，VorgangDbHelper.COLUMN_ID+“=？”，新字符串[]{s_ID}）
get抛出的错误消息是什么？请尝试将行
dataSource.close（）
移到
ondestory（）方法中。问题是您在onCreate.Errors in initial Post中关闭了数据库。get抛出的错误消息是什么？请尝试将行
dataSource.close（）
移到
onDestroy（）方法中。问题是您在onCreate中关闭了数据库。初始postOK中的错误不会创建d'oh，我可以再次删除listview，但当我退出listview活动并返回时，数据库条目仍然存在。您的数据源对象是什么类型的？您可能需要“提交”或“刷新”更改..final VorgangDataSource dataSource=new VorgangDataSource（此）；它包含关于列的所有信息。如果您需要，我可以在最初的帖子中发布。是的，我可以看到，但是“VorgangDataSource”不是一个公共类。请查看它的内部-在这种情况下，基类/超类是什么？它是一个公共类：-）现在将它添加到init postOK，它不会创建d'oh，我可以再次删除listview，但当我退出listview活动并返回时，数据库条目仍然存在。您的数据源对象是什么类型的？您可能需要“提交”或“刷新”更改..final VorgangDataSource dataSource=new VorgangDataSource（此）；它包含关于列的所有信息。如果您需要，我可以在最初的帖子中发布。是的，我可以看到，但是“VorgangDataSource”不是一个公共类。请查看它的内部-本例中的基类/超类是什么？它是一个公共类：-）现在将其添加到init post