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我正在使用自定義CursorAdapter並在數據庫中有值，但問題是值不會顯示在自定義ListView中。我在SO搜索，但無法找到我的答案。我的自定義CursorAdapter不顯示項目
通過調試，我發現遊標適配器bindView()和newView()中的2個方法沒有執行，但構造函數正在執行。我不確定整體發生了什麼。所以我的問題是爲什麼ListView項目不顯示？
這是我的代碼，我只發佈相關的代碼，所以如果有任何額外的代碼需要評論，以便我將相應地編輯。
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//a listview object
notesView = (ListView)findViewById(R.id.listView);
//an object of SQLiteOpenHelper class
dbhelper = new DataBaseHelper(this);
//cursor object
passCursor = dbhelper.fetchAllNotes();
// the custom cursor adapter class object
dataCursor = new CustomCursor(this,passCursor);
notesView.setAdapter(dataCursor);
notesView.setOnItemClickListener(this);
bar = (Toolbar)findViewById(R.id.toolbar);
setSupportActionBar(bar);
}
這裏是CursorAdapter源代碼：
public class CustomCursor extends CursorAdapter {
private static final String NOTE_TITLE = "title";
private static final String RECORD_ID = "_id";
private static final String RECORD_DATE = "date";
private static final String DELETE_FLAG="deleteflag";
LayoutInflater inflater;
TextView tv, recordID, dateET;
LinearLayout ll;
String getText, existsRecordID;
long datevalue;
SimpleDateFormat dateFormatter;
String listViewHeight;
Context cont;
int getDeleteFlag;
String listHeightValue;
LinearLayout.LayoutParams params;
Cursor getCursor;
CustomCursor(Context context, Cursor c) {
super(context, c, 0);
cont= context;
getCursor= c;
//inflater = LayoutInflater.from(context);
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
dateFormatter = new SimpleDateFormat("dd-MM-yyyy HH:mm");
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
return inflater.inflate(R.layout.customlistview, parent, false);
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
getDeleteFlag = cursor.getInt(cursor.getColumnIndex(DELETE_FLAG));
ll = (LinearLayout)view.findViewById(R.id.listViewLayout);
setListViewHeight(ll,context);
getText = cursor.getString(cursor.getColumnIndex(NOTE_TITLE));
existsRecordID = cursor.getString(cursor.getColumnIndex(RECORD_ID));
datevalue = cursor.getLong(cursor.getColumnIndex(RECORD_DATE));
Date newdate = new Date(datevalue);
recordID = (TextView) view.findViewById(R.id.recordID);
tv = (TextView) view.findViewById(R.id.content);
dateET = (TextView) view.findViewById(R.id.date);
tv.setText(getText.trim());
recordID.setText(existsRecordID);
dateET.setText(dateFormatter.format(newdate));
}
}
EDIT 1
這裏是主要佈局，
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/fragplacement"
xmlns:android="http://schemas.android.com/apk/res/android">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:gravity="top|left"
android:descendantFocusability="blocksDescendants"
tools:context="com.random.simplenotes.MainActivity">
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/toolbar"
>
</android.support.v7.widget.Toolbar>
<ListView
android:layout_width="match_parent"
android:clickable="true"
android:layout_height="match_parent"
android:id="@+id/listView"
android:scrollbars="vertical"
/>
</LinearLayout>
</FrameLayout>
下面是ListView項的佈局，
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="wrap_content"
android:descendantFocusability="blocksDescendants"
android:background="@color/PeachPuff"
android:id="@+id/listViewLayout"
android:layout_margin="7dp">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Here is the content.."
android:gravity="center"
android:id="@+id/content"
android:textColor="@color/black"
android:focusable="false"
android:ellipsize="end"
android:lines="1"
android:maxLines="1"
android:layout_gravity="center_horizontal" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="@color/black"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="12/09/15"
android:layout_margin="10dp"
android:focusable="false"
android:id="@+id/date" />
<TextView
android:layout_width="1dp"
android:layout_height="1dp"
android:visibility="gone"
android:focusable="false"
android:id="@+id/recordID" />
</LinearLayout>
代碼的方法setListViewHeight()
private void setListViewHeight(LinearLayout ll, Context con) {
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(con);
listHeightValue = sp.getString(con.getResources().getString(R.string.listViewHeightkey),Constants.DEFAULT_VALUE_LISTVIEW_HEIGHT);
switch (listHeightValue)
{
case "Tiny":
params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,200);
ll.setLayoutParams(params);
break;
case "Medium":
params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,220);
ll.setLayoutParams(params);
break;
case "Large":
params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,250);
ll.setLayoutParams(params);
break;
default:
params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,150);
ll.setLayoutParams(params);
}
}