Android-SimpleCursorAdapter changeCursor函数太慢
我正在寻找一个解决方案,以加快更新我的微调器。目前,我正在使用SimpleCursorAdapter,并在基于先前选择的微调器更改搜索条件时调用ChangeCursor 我做了一些计时测试,查询时间从5毫秒到60毫秒,而changeCursor函数则在600毫秒到4000毫秒之间。是否有另一种方法可以更快地更新适配器上的光标?我没有使用相同的查询,因此我不能简单地重新查询游标,然后调用notifydatasetchanged。我必须创建一个新的查询,然后返回一个新的游标(也许有更好的方法来完成这一部分) 以下是我目前的人口情况Android-SimpleCursorAdapter changeCursor函数太慢,android,spinner,simplecursoradapter,Android,Spinner,Simplecursoradapter,我正在寻找一个解决方案,以加快更新我的微调器。目前,我正在使用SimpleCursorAdapter,并在基于先前选择的微调器更改搜索条件时调用ChangeCursor 我做了一些计时测试,查询时间从5毫秒到60毫秒,而changeCursor函数则在600毫秒到4000毫秒之间。是否有另一种方法可以更快地更新适配器上的光标?我没有使用相同的查询,因此我不能简单地重新查询游标,然后调用notifydatasetchanged。我必须创建一个新的查询,然后返回一个新的游标(也许有更好的方法来完成这
private void writerSpinner() {
String[] columns = new String[] { Passage.COL_WRITER_ID + " " + BaseColumns._ID, Passage.COL_WRITER_NAME };
String whereClause = null;
String groupBy = null;
String orderBy = Passage.COL_WRITER_ID + " ASC";
if (mAdapterPassage == null) {
String[] columnsSpinner = new String[] { Passage.COL_WRITER_NAME };
int[] to = new int[] { android.R.id.text1 };
mAdapterPassage = new SimpleCursorAdapter(getActivity(), android.R.layout.simple_spinner_item, null, columnsSpinner, to);
mAdapterPassage.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
mPassage.setAdapter(mAdapterPassage);
mPassage.setOnItemSelectedListener(onItemSelectedListener);
}
AsyncLoadData loadData = new AsyncLoadData(mAdapterPassage, mPassage, Passage.TABLE_NAME_WRITERS, columns, whereClause, groupBy, orderBy);
loadData.execute();
}
private void updateChapterSpinner() {
String[] columns = new String[] { Passage.COL_WRITER_ID + " " + BaseColumns._ID, Passage.COL_CHAPTER_ID };
String whereClause = Passage.COL_WRITER_ID + " = " + mSelectedWriterId;
String groupBy = Passage.COL_CHAPTER_ID;
String orderBy = Passage.COL_CHAPTER_ID + " ASC";
if (mAdapterChapter == null) {
String[] columnsSpinner = new String[] { Passage.COL_CHAPTER_ID };
int[] to = new int[] { android.R.id.text1 };
mAdapterChapter = new SimpleCursorAdapter(getActivity(), android.R.layout.simple_spinner_item, null, columnsSpinner, to);
mAdapterChapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
mChapter.setAdapter(mAdapterChapter);
mChapter.setOnItemSelectedListener(onItemSelectedListener);
}
AsyncLoadData loadData = new AsyncLoadData(mAdapterChapter, mChapter, Passage.TABLE_NAME_PASSAGES, columns, whereClause, groupBy, orderBy);
loadData.execute();
}
private void updateVerseSpinner() {
String[] columns = new String[] { Passage.COL_WRITER_ID + " " + BaseColumns._ID, Passage.COL_VERSE_ID };
String whereClause = Passage.COL_WRITER_ID + " = " + mSelectedWriterId
+ " AND " + Passage.COL_CHAPTER_ID + " = " + mSelectedChapter;
String groupBy = Passage.COL_VERSE_ID;
String orderBy = Passage.COL_VERSE_ID + " ASC";
if (mAdapterVerse == null) {
String[] columnsSpinner = new String[] { Passage.COL_VERSE_ID };
int[] to = new int[] { android.R.id.text1 };
mAdapterVerse = new SimpleCursorAdapter(getActivity(), android.R.layout.simple_spinner_item, null, columnsSpinner, to);
mAdapterVerse.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
mVerse.setAdapter(mAdapterVerse);
mVerse.setOnItemSelectedListener(onItemSelectedListener);
}
AsyncLoadData loadData = new AsyncLoadData(mAdapterVerse, mVerse, Passage.TABLE_NAME_PASSAGES, columns, whereClause, groupBy, orderBy);
loadData.execute();
}
private class AsyncLoadData extends AsyncTask<Void, Void, Void> {
String mTableName;
String[] mColumns;
String mWhereClause;
String mGroupBy;
String mOrderBy;
Spinner mSpinner;
Cursor mCursor;
SimpleCursorAdapter mAdapter;
public AsyncLoadData(SimpleCursorAdapter adapter, Spinner spinner, String tableName, String[] columns, String whereClause, String groupBy, String orderBy) {
mAdapter = adapter;
mSpinner = spinner;
mTableName = tableName;
mColumns = columns;
mWhereClause = whereClause;
mGroupBy = groupBy;
mOrderBy = orderBy;
}
@Override
protected void onPreExecute()
{
//mSpinner.setVisibility(View.GONE);
}
@Override
protected Void doInBackground(Void... arg0) {
long startCursor = new Date().getTime();
mCursor = mDBHandler.query(mTableName, mColumns, mWhereClause, null, mGroupBy, null, mOrderBy);
long timeToQuery = new Date().getTime() - startCursor;
Log.i("CursorQuery", "Time to Query Cursor " + mGroupBy + ": " + timeToQuery + "ms");
return null;
}
@Override
protected void onPostExecute(Void result)
{
long startAdapter = new Date().getTime();
mAdapter.changeCursor(mCursor);
long timeToChangeCursor = new Date().getTime() - startAdapter;
Log.i("AdapterQuery", "Time to Change Cursor " + mGroupBy + ": " + timeToChangeCursor + "ms");
mAdapter.notifyDataSetChanged();
//mSpinner.setVisibility(View.VISIBLE);
}
}
private OnItemSelectedListener onItemSelectedListener = new OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
switch(parent.getId()) {
case R.id.bible_passage:
mSelectedWriterId = position + 1;
updateChapterSpinner();
break;
case R.id.bible_chapter:
mSelectedChapter = position + 1;
updateVerseSpinner();
break;
case R.id.bible_verse:
mSelectedVerse = position + 1;
break;
}
}
public void onNothingSelected(AdapterView<?> parent) {
}
};
private void writerSpinner(){
字符串[]列=新字符串[]{Passage.COL\u WRITER\u ID+“”+BaseColumns.\u ID,Passage.COL\u WRITER\u NAME};
字符串whereClause=null;
字符串groupBy=null;
字符串orderBy=Passage.COL\u WRITER\u ID+“ASC”;
if(madapterpassession==null){
String[]columnsSpinner=新字符串[]{Passage.COL\u WRITER\u NAME};
int[]to=newint[]{android.R.id.text1};
madapterPassation=new SimpleCursorAdapter(getActivity(),android.R.layout.simple\u微调器\u项,null,columnsSpinner,to);
madapterPassation.setDropDownViewResource(android.R.layout.simple\u微调器\u下拉菜单\u项);
mPassage.setAdapter(mAdapterPassage);
mPassage.setOnItemSelectedListener(onItemSelectedListener);
}
AsyncLoadData loadData=新的AsyncLoadData(mAdapterPassage、mPassage、Passage.TABLE\u NAME\u WRITERS、columns、where子句、groupBy、orderBy);
loadData.execute();
}
私有void updateChapterSpinner(){
字符串[]列=新字符串[]{Passage.COL\u WRITER\u ID+“”+BaseColumns.\u ID,Passage.COL\u CHAPTER\u ID};
字符串whereClause=Passage.COL\u WRITER\u ID+“=”+mSelectedWriterId;
字符串groupBy=Passage.COL\u CHAPTER\u ID;
字符串orderBy=Passage.COL\u CHAPTER\u ID+“ASC”;
如果(mAdapterChapter==null){
String[]columnspinner=新字符串[]{Passage.COL\u CHAPTER\u ID};
int[]to=newint[]{android.R.id.text1};
mAdapterChapter=new SimpleCursorAdapter(getActivity(),android.R.layout.simple\u微调器\u项,null,columnsSpinner,to);
setDropDownViewResource(android.R.layout.simple\u微调器\u下拉菜单\u项);
McChapter.setAdapter(Madapter章);
mChapter.setOnItemSelectedListener(onItemSelectedListener);
}
AsyncLoadData loadData=新的AsyncLoadData(mAdapterChapter、mChapter、Passage.TABLE\u NAME\u passions、columns、where子句、groupBy、orderBy);
loadData.execute();
}
私有void updateVerseSpinner(){
字符串[]列=新字符串[]{Passage.COL\u WRITER\u ID+“”+BaseColumns.\u ID,Passage.COL\u VERSE\u ID};
字符串whereClause=Passage.COL\u WRITER\u ID+“=”+mSelectedWriterId
+“和”+Passage.COL_CHAPTER_ID+“=”+mSelectedChapter;
字符串groupBy=Passage.COL\u VERSE\u ID;
字符串orderBy=Passage.COL\u VERSE\u ID+“ASC”;
if(mAdapterVerse==null){
String[]columnsSpinner=新字符串[]{Passage.COL\u VERSE\u ID};
int[]to=newint[]{android.R.id.text1};
mAdapterVerse=new SimpleCursorAdapter(getActivity(),android.R.layout.simple\u微调器\u项,null,columnsSpinner,to);
setDropDownViewResource(android.R.layout.simple\u微调器\u下拉菜单\u项);
mVerse.setAdapter(mAdapterVerse);
mVerse.setOnItemSelectedListener(onItemSelectedListener);
}
AsyncLoadData loadData=新的AsyncLoadData(mAdapterVerse、mVerse、Passage.TABLE\u NAME\u passions、columns、where子句、groupBy、orderBy);
loadData.execute();
}
私有类AsyncLoadData扩展了AsyncTask{
字符串名称;
字符串[]m列;
字符串子句;
字符串管理器;
弦摩德比;
纺纱机;
光标mCursor;
简单的适应;
公共AsyncLoadData(SimpleCursorAdapter适配器、微调器微调器、字符串表名、字符串[]列、字符串whereClause、字符串groupBy、字符串orderBy){
mAdapter=适配器;
mSpinner=旋转器;
mTableName=表名;
mColumns=列;
mWhere子句=where子句;
mGroupBy=groupBy;
摩德比=奥德比;
}
@凌驾
受保护的void onPreExecute()
{
//mSpinner.setVisibility(View.GONE);
}
@凌驾
受保护的Void doInBackground(Void…arg0){
long startCursor=new Date().getTime();
mCursor=mDBHandler.query(mTableName、mColumns、mWhereClause、null、mGroupBy、null、mOrderBy);
long-timeToQuery=new Date().getTime()-startCursor;
Log.i(“游标查询”,“查询游标的时间”+mGroupBy+:“+timeToQuery+“ms”);
返回null;
}
@凌驾
受保护的void onPostExecute(void结果)
{
long startAdapter=new Date().getTime();
mAdapter.changeCursor(mCursor);
long-timeToChangeCursor=新日期().getTime()-startAdapter;
Log.i(“AdapterQuery”,“更改光标的时间”+mGroupBy+:“+timeToChangeCursor+“ms”);
mAdapter.notifyDataSetChanged();
//mSpinner.setVisibility(View.VISIBLE);
}
}
私有OnItemSelectedListener OnItemSelectedListener=新建OnItemSelectedListener(){
已选择公共视图(AdapterView父视图、视图视图、整型位置、长id){
开关(parent.getId()){
案例R.id.bible_段:
mSelectedWriterId=位置+1;
updateCh
adapter.changeCursor(new HugeSQLiteCursor(db, stepSize,
table, columnFields,
selection, selectionArgs));