Question

我正在尝试使用带有SimpleCursorAdaptor的listView来显示数据库记录。应用程序不断崩溃，出现以下错误：资源ID＃0x7f0d0061类型＃0x12无效。崩溃的Java代码在

之下

public class ViewActivity extends AppCompatActivity  {

DatabaseHelper myDb;
ListView myList;

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

    myDb = new DatabaseHelper(this);
    myList = (ListView) findViewById(R.id.listViewLocations);


    getListFromDb();
}

public void getListFromDb(){
    Cursor res = myDb.ViewAll();
    startManagingCursor(res);


    //Map cursor from db to viewFields
    String[] fromFieldNames = new String[]{DatabaseHelper.COL_2, DatabaseHelper.COL_3, DatabaseHelper.COL_4, DatabaseHelper.COL_5};
    int[] toViewIDS = new int[]{R.id.viewName, R.id.viewAddress, R.id.viewPostcode, R.id.viewType};

    //Create adaptor to map items from DB to UI
    SimpleCursorAdapter myCursorAdaptor = new SimpleCursorAdapter(this, R.id.item_layout, res, fromFieldNames, toViewIDS, 0);

    // Set adaptor for listView
    myList.setAdapter(myCursorAdaptor);

}

这两个XML文件： activity_view.xml

<ListView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/listViewLocations"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true" />

item_layout.xml

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:text="Medium Text"
    android:id="@+id/viewName"
    android:layout_alignParentTop="true"
    android:layout_alignParentStart="true" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:text="Medium Text"
    android:id="@+id/viewAddress"
    android:layout_below="@+id/viewName"
    android:layout_alignParentStart="true" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:text="Medium Text"
    android:id="@+id/viewPostcode"
    android:layout_below="@+id/viewAddress"
    android:layout_alignParentStart="true" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:text="Medium Text"
    android:id="@+id/viewType"
    android:layout_below="@+id/viewPostcode"
    android:layout_alignParentStart="true" />

为什么它会一直崩溃，我该怎么做才能解决它。

干杯

Answer 1

item_layout应该是布局不是id请更改如下：

SimpleCursorAdapter myCursorAdaptor = new SimpleCursorAdapter(this, R.layout.item_layout, res, fromFieldNames, toViewIDS, 0);

Android应用程序因错误而崩溃：资源ID＃0x7f0d0061类型＃0x12无效

1 个答案: