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Add an option to not register the ContentObserver when creating a CursorAdapter.

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Change-Id: Ic18f0307f5ba0d54f7270d8d1e032feff537360b
This commit is contained in:
Jeff Hamilton
2010-03-31 23:54:11 -05:00
parent bb9d7bd4cf
commit 451513baa7
2 changed files with 96 additions and 7 deletions
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53
api/current.xml
View File

@@ -200039,6 +200039,20 @@
<parameter name="autoRequery" type="boolean">
</parameter>
</constructor>
<constructor name="CursorAdapter"
type="android.widget.CursorAdapter"
static="false"
final="false"
deprecated="not deprecated"
visibility="public"
>
<parameter name="context" type="android.content.Context">
</parameter>
<parameter name="c" type="android.database.Cursor">
</parameter>
<parameter name="flags" type="int">
</parameter>
</constructor>
<method name="bindView"
return="void"
abstract="true"
@@ -200186,6 +200200,23 @@
<parameter name="autoRequery" type="boolean">
</parameter>
</method>
<method name="init"
return="void"
abstract="false"
native="false"
synchronized="false"
static="false"
final="false"
deprecated="not deprecated"
visibility="protected"
>
<parameter name="context" type="android.content.Context">
</parameter>
<parameter name="c" type="android.database.Cursor">
</parameter>
<parameter name="flags" type="int">
</parameter>
</method>
<method name="newDropDownView"
return="android.view.View"
abstract="false"
@@ -200257,6 +200288,28 @@
<parameter name="filterQueryProvider" type="android.widget.FilterQueryProvider">
</parameter>
</method>
<field name="FLAG_AUTO_REQUERY"
type="int"
transient="false"
volatile="false"
value="1"
static="true"
final="true"
deprecated="not deprecated"
visibility="public"
>
</field>
<field name="FLAG_REGISTER_CONTENT_OBSERVER"
type="int"
transient="false"
volatile="false"
value="2"
static="true"
final="true"
deprecated="not deprecated"
visibility="public"
>
</field>
</class>
<class name="CursorTreeAdapter"
extends="android.widget.BaseExpandableListAdapter"

50
core/java/android/widget/CursorAdapter.java
View File

@@ -79,6 +79,18 @@ public abstract class CursorAdapter extends BaseAdapter implements Filterable,
*/
protected FilterQueryProvider mFilterQueryProvider;
/**
* If set the adapter will call requery() on the cursor whenever a content change
* notification is delivered. Implies {@link #FLAG_REGISTER_CONTENT_OBSERVER}
*/
public static final int FLAG_AUTO_REQUERY = 0x01;
/**
* If set the adapter will register a content observer on the cursor and will call
* {@link #onContentChanged()} when a notification comes in.
*/
public static final int FLAG_REGISTER_CONTENT_OBSERVER = 0x02;
/**
* Constructor. The adapter will call requery() on the cursor whenever
* it changes so that the most recent data is always displayed.
@@ -87,7 +99,7 @@ public abstract class CursorAdapter extends BaseAdapter implements Filterable,
* @param context The context
*/
public CursorAdapter(Context context, Cursor c) {
init(context, c, true);
init(context, c, FLAG_AUTO_REQUERY);
}
/**
@@ -99,19 +111,43 @@ public abstract class CursorAdapter extends BaseAdapter implements Filterable,
* data is always displayed.
*/
public CursorAdapter(Context context, Cursor c, boolean autoRequery) {
init(context, c, autoRequery);
init(context, c, autoRequery ? FLAG_AUTO_REQUERY : 0);
}
/**
* Constructor
* @param c The cursor from which to get the data.
* @param context The context
* @param flags flags used to determine the behavior of the adapter
*/
public CursorAdapter(Context context, Cursor c, int flags) {
init(context, c, flags);
}
protected void init(Context context, Cursor c, boolean autoRequery) {
init(context, c, autoRequery ? FLAG_AUTO_REQUERY : 0);
}
protected void init(Context context, Cursor c, int flags) {
if ((flags & FLAG_AUTO_REQUERY) == FLAG_AUTO_REQUERY) {
flags |= FLAG_REGISTER_CONTENT_OBSERVER;
mAutoRequery = true;
} else {
mAutoRequery = false;
}
boolean cursorPresent = c != null;
mAutoRequery = autoRequery;
mCursor = c;
mDataValid = cursorPresent;
mContext = context;
mRowIDColumn = cursorPresent ? c.getColumnIndexOrThrow("_id") : -1;
mChangeObserver = new ChangeObserver();
if ((flags & FLAG_REGISTER_CONTENT_OBSERVER) == FLAG_REGISTER_CONTENT_OBSERVER) {
mChangeObserver = new ChangeObserver();
} else {
mChangeObserver = null;
}
if (cursorPresent) {
c.registerContentObserver(mChangeObserver);
if (mChangeObserver != null) c.registerContentObserver(mChangeObserver);
c.registerDataSetObserver(mDataSetObserver);
}
}
@@ -246,13 +282,13 @@ public abstract class CursorAdapter extends BaseAdapter implements Filterable,
return;
}
if (mCursor != null) {
mCursor.unregisterContentObserver(mChangeObserver);
if (mChangeObserver != null) mCursor.unregisterContentObserver(mChangeObserver);
mCursor.unregisterDataSetObserver(mDataSetObserver);
mCursor.close();
}
mCursor = cursor;
if (cursor != null) {
cursor.registerContentObserver(mChangeObserver);
if (mChangeObserver != null) cursor.registerContentObserver(mChangeObserver);
cursor.registerDataSetObserver(mDataSetObserver);
mRowIDColumn = cursor.getColumnIndexOrThrow("_id");
mDataValid = true;