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178 lines (151 loc) · 5.13 KB
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package com.easylib.misc;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.support.v4.content.AsyncTaskLoader;
public class CursorLoaderSupport extends AsyncTaskLoader<Cursor> {
final ForceLoadContentObserver mObserver;
String mTable;
String[] mProjection;
String mSelection;
String[] mSelectionArgs;
String mSortOrder;
Cursor mCursor;
/* Runs on a worker thread */
@Override
public Cursor loadInBackground() {
Cursor cursor = null; //TODO write your query here
if (cursor != null) {
// Ensure the cursor window is filled
cursor.getCount();
cursor.registerContentObserver(mObserver);
}
return cursor;
}
/* Runs on the UI thread */
@Override
public void deliverResult(Cursor cursor) {
if (isReset()) {
// An async query came in while the loader is stopped
if (cursor != null) {
cursor.close();
}
return;
}
Cursor oldCursor = mCursor;
mCursor = cursor;
if (isStarted()) {
super.deliverResult(cursor);
}
if (oldCursor != null && oldCursor != cursor && !oldCursor.isClosed()) {
oldCursor.close();
}
}
/**
* Creates an empty unspecified CursorLoader. You must follow this with
* calls to {@link #setUri(Uri)}, {@link #setSelection(String)}, etc
* to specify the query to perform.
*/
public CursorLoaderSupport(Context context) {
super(context);
mObserver = new ForceLoadContentObserver();
}
/**
* Creates a fully-specified CursorLoader. See
* {@link android.content.ContentResolver#query(Uri, String[], String, String[], String)
* ContentResolver.query()} for documentation on the meaning of the
* parameters. These will be passed as-is to that call.
*/
public CursorLoaderSupport(Context context, String table, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {
super(context);
mObserver = new ForceLoadContentObserver();
mTable = table;
mProjection = projection;
mSelection = selection;
mSelectionArgs = selectionArgs;
mSortOrder = sortOrder;
}
public CursorLoaderSupport(Context context, String table) {
super(context);
mObserver = new ForceLoadContentObserver();
mTable = table;
}
/**
* Starts an asynchronous load of the contacts list data. When the result is ready the callbacks
* will be called on the UI thread. If a previous load has been completed and is still valid
* the result may be passed to the callbacks immediately.
*
* Must be called from the UI thread
*/
@Override
protected void onStartLoading() {
if (mCursor != null) {
deliverResult(mCursor);
}
if (takeContentChanged() || mCursor == null) {
forceLoad();
}
}
/**
* Must be called from the UI thread
*/
@Override
protected void onStopLoading() {
// Attempt to cancel the current load task if possible.
cancelLoad();
}
@Override
public void onCanceled(Cursor cursor) {
if (cursor != null && !cursor.isClosed()) {
cursor.close();
}
}
@Override
protected void onReset() {
super.onReset();
// Ensure the loader is stopped
onStopLoading();
if (mCursor != null && !mCursor.isClosed()) {
mCursor.close();
}
mCursor = null;
}
public String[] getProjection() {
return mProjection;
}
public void setProjection(String[] projection) {
mProjection = projection;
}
public String getSelection() {
return mSelection;
}
public void setSelection(String selection) {
mSelection = selection;
}
public String[] getSelectionArgs() {
return mSelectionArgs;
}
public void setSelectionArgs(String[] selectionArgs) {
mSelectionArgs = selectionArgs;
}
public String getSortOrder() {
return mSortOrder;
}
public void setSortOrder(String sortOrder) {
mSortOrder = sortOrder;
}
// @Override
// public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) {
// super.dump(prefix, fd, writer, args);
// writer.print(prefix); writer.print("mUri="); writer.println(mUri);
// writer.print(prefix); writer.print("mProjection=");
// writer.println(Arrays.toString(mProjection));
// writer.print(prefix); writer.print("mSelection="); writer.println(mSelection);
// writer.print(prefix); writer.print("mSelectionArgs=");
// writer.println(Arrays.toString(mSelectionArgs));
// writer.print(prefix); writer.print("mSortOrder="); writer.println(mSortOrder);
// writer.print(prefix); writer.print("mCursor="); writer.println(mCursor);
// // writer.print(prefix); writer.print("mContentChanged="); writer.println(mContentChanged);
// }
}