listView和cursoradapter

Question

我正在研究我的最終項目，並且遇到了一個問題。我想從我的數據庫（DatabaseBon）傳遞數據到一個列表視圖。有人可以幫我嗎？

我的活動是這樣的：

 public class BlackNumbersBlockDb extends Activity { 
     String TAG; 
     @Override 
    protected void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.blocknumbersdb); 
    @SuppressWarnings("unused") 
    Button imBT= (Button)findViewById(R.id.importBL); 
    DataBaseBON info= new DataBaseBON(this); 
    info.open(); 
    Cursor cursor=info.getcursor(); 
    startManagingCursor(cursor); 
    ContactCursorAdapter adapter = new ContactCursorAdapter(null, cursor); 
    ListView contactLV = (ListView) findViewById(R.id.listviewblDB); 
    contactLV.setAdapter(adapter); 
    info.close(); 
     imBT.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      Intent i= new Intent ("android.intent.action.IMPORTM"); 
      startActivity(i); 
     } 
    }); 

我CursorAdapter的樣子：

**import vahid.engineer.com.DataBaseBON** (is it c orrect??) 
    . 
    . 
    . 


    public class ContactCursorAdapter extends CursorAdapter { 
    public ContactCursorAdapter(Context context, Cursor c) { 
    super(context, c); 
} 

@Override 
public void bindView(View view, Context context, Cursor cursor) { 
    TextView name = (TextView)view.findViewById(R.id.blacklistDB1); 
    name.setText(cursor.getString(cursor.getColumnIndex(DataBaseBON.N_NAME))); 
    TextView phone = (TextView)view.findViewById(R.id.blacklistDB2); 
    phone.setText(cursor.getString(cursor.getColumnIndex(DataBaseBON.KEY_NUMBER)));} 

@Override 
public View newView(Context context, Cursor cursor, ViewGroup parent) { 
    LayoutInflater inflater = LayoutInflater.from(context); 
    View v = inflater.inflate(R.layout.lv, parent, false); 
    bindView(v, context, cursor); 
    return v; 

我的LV XML文件看起來像

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="vertical" > 

    <TextView 
      android:id="@+id/blacklistDB1" 
      android:layout_width="33dp" 
      android:layout_height="wrap_content" 
      android:text="Large Text" 
      /> 
    <TextView 
     android:id="@+id/blacklistDB2" 
     android:layout_width="19dp" 
     android:layout_height="wrap_content" 
     android:text="Large Text" 
     /> 
     </LinearLayout> 

我blockornot XML文件的樣子

< LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="vertical" > 
    <ListView 
     android:id="@+id/listviewblDB" 
     android:layout_width="match_parent" 
     android:layout_height="499dp" 
     android:layout_weight="0.72" > 
    </ListView> 
    <LinearLayout 
    android:layout_width="match_parent" 
    android:layout_height="129dp" 
    android:gravity="bottom|center_horizontal|fill|top" 
    android:orientation="horizontal" > 

    <Button 
     android:id="@+id/importBL" 
     android:layout_width="100dp" 
     android:layout_height="90dp" 
     android:layout_marginLeft="10sp" 
     android:layout_marginTop="20sp" 
     android:ems="10" 
     android:text="Import" 
     android:textSize="20sp"/> 
    <Button 
     android:id="@+id/deleteBL" 
     android:layout_width="126dp" 
     android:layout_height="90dp" 
     android:layout_marginLeft="10sp" 
     android:layout_marginTop="20sp" 
     android:ems="10" 
     android:text="Delete" 
     android:textSize="20sp" /> 
     </LinearLayout> 

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:gravity="center_horizontal" 
    android:orientation="vertical" > 
    <TextView 
     android:id="@+id/blacklistDB1" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
    /> 
    <TextView 
     android:id="@+id/blacklistDB2" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
    /> 
     android:layout_width="match_parent" 
    android:layout_height="626dp" 
    android:gravity="bottom|center_horizontal|fill|top" 
    android:orientation="horizontal" /> 
    <LinearLayout 
     android:layout_width="wrap_content" 
     android:layout_height="129dp" 
     android:gravity="bottom|center_horizontal|fill|top" 
     android:orientation="horizontal" > 
     <Button 
      android:id="@+id/importBT" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="Import" android:textSize="30sp"/> 
     <Button 
      android:id="@+id/deleteBT" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_marginLeft="20sp" 
      android:text="Delete" android:textSize="30sp"/> 
     </LinearLayout> 

我的錯誤

 java.lang.NullPointerException 
    at android.view.LayoutInflater.from(LayoutInflater.java:171) 
    at vahid.engineer.com.ContactCursorAdapter.newView(ContactCursorAdapter.java:40) 
at android.widget.CursorAdapter.getView(CursorAdapter.java:182) 
    at android.widget.AbsListView.obtainView(AbsListView.java:1315) 
at android.widget.ListView.makeAndAddView(ListView.java:1727) 

Answer 1

嘗試：

LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);