活动的完整代码：
package com.stevovo.myactivity;
import java.util.ArrayList;
import java.util.EmptyStackException;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckedTextView;
import android.widget.ExpandableListView;
import android.widget.LinearLayout;
import android.widget.ListView;
public class myactivityselect extends Activity {
ArrayList<String> mCheckedItems;
MyListView lv;
ExpandableListView elv;
Activity a;
Button tv, back1, back2;
MySimpleExpandableList simpleList; //custom expandable list view adapter
MySimpleGroup grp; //just a class to manage parents and children
boolean firstRun;
public void onCreate(Bundle savedInstanceState) {
simpleList = new MySimpleExpandableList(myactivityselect .this);
super.onCreate(savedInstanceState);
a = this;
firstRun = true;
changeView(R.layout.ingr_selectview);
}
public void onPause() {
myactivitydb.db.saveInventoryItems(mCheckedItems); //save checked items in database
super.onPause();
}
public MySimpleGroup ComputeIngredients() {
MySimpleGroup grp = new MySimpleGroup();
Ingredient[] ingrs = myactivitydb.db.getIngredients(lv.mCheckedItems);
String[] currentEffects;
String mainIngredient;
String[] sMatchingIngredients;
ArrayList<String> matchingIngredients;
for (int i = 0; i < ingrs.length; i++) {
mainIngredient = ingrs[i].name;
currentEffects = new String[4];
currentEffects[0] = ingrs[i].effects[0];
currentEffects[1] = ingrs[i].effects[1];
currentEffects[2] = ingrs[i].effects[2];
currentEffects[3] = ingrs[i].effects[3];
matchingIngredients = new ArrayList<String>();
for (int x = 0; x < ingrs.length; x++) {
if (mainIngredient.equals(ingrs[x].name)) {
continue;
}
for (int y = 0; y < 4; y++) {
if (currentEffects[y].equals(ingrs[x].effects[y])) {
matchingIngredients.add(ingrs[x].name);
break;
}
}
}
sMatchingIngredients = new String[matchingIngredients.size()];
for (int x = 0; x < matchingIngredients.size(); x++) {
sMatchingIngredients[x] = matchingIngredients.get(x).toString();
}
if (matchingIngredients.size() > 0) {
grp.addGroup(mainIngredient, sMatchingIngredients);
}
}
return grp;
}
public void changeView(int layoutResID) {
switch (layoutResID) {
case R.layout.ingr_selectview:
a.setContentView(layoutResID);
lv = (MyListView) a.findViewById(R.id.list_IngrSelect);
lv.setTextFilterEnabled(true);
if (firstRun) {
lv.mCheckedItems = myactivitydb.db.getSavedInventoryItems();
firstRun = false;
} else if (this.mCheckedItems != null) {
lv.mCheckedItems = this.mCheckedItems;
}
tv = (Button) a.findViewById(R.id.btnShowPotions);
tv.setText("Show Available Potions");
tv.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
if (lv.mCheckedItems.size() > 0) {
MySimpleGroup grp = ComputeIngredients();
simpleList.clear();
simpleList.addSimpleGroup(grp);
simpleList.showChildCount(true);
mCheckedItems = lv.mCheckedItems;
changeView(R.layout.ingr_selectview_ingrs);
}
}
});
class MyCheckedTextView extends CheckedTextView {
public boolean checked;
public MyCheckedTextView(Context context) {
super(context);
}
}
class MyArrayAdapter<T> extends ArrayAdapter<T> {
Context context;
public MyArrayAdapter(Context context, int textViewResourceId) {
super(context, textViewResourceId);
this.context = context;
}
public View getView(int position, View convertView, ViewGroup parent) {
MyCheckedTextView ctv = new MyCheckedTextView(this.context);
ctv.setText((String) getItem(position).toString());
ctv.checked = lv.isItemChecked((String) ctv.getText());
if (ctv.checked) {
ctv.setCheckMarkDrawable(android.R.drawable.button_onoff_indicator_on);
} else {
ctv.setCheckMarkDrawable(android.R.drawable.button_onoff_indicator_off);
}
ctv.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
MyCheckedTextView view = (MyCheckedTextView) v;
if (!view.checked) {
view.checked = true;
view.setCheckMarkDrawable(android.R.drawable.button_onoff_indicator_on);
lv.addCheckedItem((String) view.getText());
} else {
view.checked = false;
view.setCheckMarkDrawable(android.R.drawable.button_onoff_indicator_off);
lv.removeCheckedItem((String) view.getText());
}
}
});
return ctv;
}
}
MyArrayAdapter<String> arr = new MyArrayAdapter<String>(this, android.R.layout.simple_list_item_checked);
myactivitydb.db.ingredient_list_array(arr);
lv.setAdapter(arr);
lv.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
break;
case R.layout.ingr_selectview_ingrs:
a.setContentView(layoutResID);
elv = (ExpandableListView) a.findViewById(R.id.list_ingrSelectIngrs);
elv.setAdapter(simpleList);
back1 = (Button) a.findViewById(R.id.btnBack);
back1.setText("Go Back");
back1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
changeView(R.layout.ingr_selectview);
}
});
break;
}
}
}
我有一个方法changeView，它使用setContentView在两个不同的视图之间切换。一切正常，但初始列表视图（MyListView lv）文本过滤器仅在启动活动时起作用。
调用changeView方法后，我的lv列表视图文本过滤器不再有效。谁能告诉我为什么？
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