如何解决changeCursor导致CalledFromWrongThreadException异常…，但仅一次
|| 我正在使用列表视图和上下文菜单。当用户长按上下文菜单中的某个项目时，列表中该项目旁边会出现一个小标记，以使用户知道该项目已被标记为收藏。一切都很好，除了它会在第一次完成时导致强制闭合。每隔一段时间就可以了。 以下是相关代码： @Override
public boolean onContextItemSelected(MenuItem item) {
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
switch (item.getItemId()) {
case 0:
mDbHelper.updateFavorite(info.id,1);
new bgRequery().execute();
return true;
case 1:
mDbHelper.updateFavorite(info.id,0);
new bgRequery().execute();
return true;
default:
return super.onContextItemSelected(item);
}
}
private class bgRequery extends AsyncTask<Void,Integer,Void> {
@Override
protected Void doInBackground(Void... voids ) {
mSpellCursor = fetchCursor();
return null;
}
@Override
protected void onPostExecute(Void voids) {
spellsAdapter.changeCursor(mSpellCursor);
}
}
public class SpellListAdapter extends CursorAdapter {
private LayoutInflater mLayoutInflater;
private Context mContext;
public SpellListAdapter(Context context,Cursor c) {
super(context,c);
mContext = context;
mLayoutInflater = LayoutInflater.from(context);
}
@Override
public View newView(Context context,Cursor cursor,ViewGroup parent) {
View v = mLayoutInflater.inflate(R.layout.list_item_fave,parent,false);
return v;
}
@Override
public void bindView(View v,Context context,Cursor c) {
String spell = c.getString(c.getColumnIndexOrThrow(SpellDbAdapter.KEY_SPELL));
int fave = c.getInt(c.getColumnIndexOrThrow(SpellDbAdapter.KEY_FAVORITE));
/**
* Next set the title of the entry.
*/
TextView Spell = (TextView) v.findViewById(R.id.text);
if (Spell != null) {
Spell.setText(spell);
}
//Set Fave Icon
TextView Fave = (TextView) v.findViewById(R.id.fave_icon);
Fave.setVisibility(View.INVISIBLE);
if (fave == 1){
Fave.setVisibility(View.VISIBLE);
}
}
public void update() {
notifyDataSetChanged();
}
}
解决方法
异步任务有时可能会溢出。您最好在CursorAdapter的onContentChanged中使用自己的线程。这是我的代码供您参考：
private class NearbyLocationListAdapter extends CursorAdapter
{
private static final String TAG = \"NearbyLocationListAdapter\";
private NearbyLocationActivity mActivity = null;
private Thread mContentChanageHanderThread = null;
public NearbyLocationListAdapter(NearbyLocationActivity activity,Cursor c) {
super(activity,c,false);
this.mActivity = activity;
}
// called when adding location info into location db
@Override
protected void onContentChanged() {
// AsyncTask will bring RejectedExecutionException,change to use Thread
// interrupt the original thread since data is updated again
clearContentChanageHanderThread();
mContentChanageHanderThread = new Thread(new Runnable() {
// set as synchronized in case called by multiple thread
@Override
public synchronized void run() {
if (Thread.currentThread().isInterrupted()) {
// Log.d(TAG,\"Thread interrupted. Aborting.\");
return;
}
final Cursor cursor = getLocationCursor();
if (Thread.currentThread().isInterrupted()) {
// Log.d(TAG,\"Thread interrupted after getting cursor. Aborting.\");
if (Util.isValid(cursor)) {
cursor.close();
}
return;
}
NearbyLocationActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
if (Util.isValid(cursor)) {
// will close the original cursor and switch to new one
// notifyDataSetChanged will be called inside
// Log.d(TAG,\"onContentChanged: will changeCursor\");
changeCursor(cursor);
}
else {
Log.e(TAG,\"onContentChanged: cursor is null or closed\");
}
}
});
}
});
mContentChanageHanderThread.start();
}
.....................................
public void clearContentChanageHanderThread() {
//Log.v(TAG,\"clearContentChanageHanderThread\");
if (mContentChanageHanderThread != null && mContentChanageHanderThread.isAlive()) {
mContentChanageHanderThread.interrupt();
mContentChanageHanderThread = null;
}
}
}
runOnUiThread(new Runnable() {
public void run() {
spellsAdapter.changeCursor(mSpellCursor);
}
});
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