Java 初始化适配器的正确方式和位置
我试图为我的列表视图设置一个过滤器,但我遇到了这些错误 无法解析符号“myAdapter” 我知道myAdapter尚未初始化,但我不知道需要在哪个类中声明它 错误:类SearchView中的方法setOnQueryTextListener无法应用于给定类型; 必需:android.support.v7.widget.SearchView.OnQueryTextListener 找到:android.widget.SearchView.OnQueryTextListener 原因:无法通过方法调用转换将实际参数android.widget.SearchView.OnQueryTextListener转换为android.support.v7.widget.SearchView.OnQueryTextListener 我知道android.widget.SearchView.OnQueryTextListener无法转换为android.support.v7.widget.SearchView.OnQueryTextListener,但我不知道代码中需要更改什么。我的应用程序使用支持库。我们将不胜感激 VictoriaLineActivity.java FragmentVictoriaLine.javaJava 初始化适配器的正确方式和位置,java,android,android-activity,android-adapter,android-listfragment,Java,Android,Android Activity,Android Adapter,Android Listfragment,我试图为我的列表视图设置一个过滤器,但我遇到了这些错误 无法解析符号“myAdapter” 我知道myAdapter尚未初始化,但我不知道需要在哪个类中声明它 错误:类SearchView中的方法setOnQueryTextListener无法应用于给定类型; 必需:android.support.v7.widget.SearchView.OnQueryTextListener 找到:android.widget.SearchView.OnQueryTextListener 原因:无法通过方法调
你的错误几乎可以告诉你你做错了什么: 无法解析符号“myAdapter” 这是因为您没有声明任何名为myAdapter的变量 错误:类SearchView中的方法setOnQueryTextListener不能为空 适用于给定类型;必修的: 找到android.support.v7.widget.SearchView.OnQueryTextListener: android.widget.SearchView.OnQueryTextListener原因:实际参数 无法将android.widget.SearchView.OnQueryTextListener转换为 android.support.v7.widget.SearchView.OnQueryTextListener by方法 调用转换 检查您的导入。您需要使用android.support.v7.widget.SearchView,但您使用的是标准的SearchView。这应该可以通过简单地导入正确的包来解决 编辑: 您使用的OnQueryListener类型错误,需要使用支持版本 编辑2: 希望这将帮助您开始:
public class FragmentVictoriaLine extends Fragment {
/**Declare other variables**/
private MyAdapter myAdapter;
public FragmentVictoriaLine() {
// Required empty public constructor
}
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_victoria_line, container, false);
//Tell the system to call onCreateOptinsMenu
setHasOptionsMenu(true);
if (getActivity().findViewById(R.id.detail_container) != null) {
mTwoPane = true;
} else {
mTwoPane = false;
}
mVictoria = new Victoria[]{
new Victoria(R.string.bank, R.string.zone_1, WCBankActivity.class, FragmentWCBank.class),
new Victoria(R.string.wat, R.string.zone_1, WCWATActivity.class, FragmentWCWAT.class)
};
//Declare your adapter here so you can access later
myAdapter = new MyAdapter(getActivity(), mVictoria);
final ListView listView = (ListView) v.findViewById(R.id.list_victoria);
//Set teh adapter here.
listView.setAdapter(myAdapter);
listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
listView.setTextFilterEnabled(true);
return v;
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
// Inflate the menu items for use in the action bar
inflater.inflate(R.menu.menu_victoria_line, menu);
// Associate searchable configuration with the SearchView
SearchManager searchManager = (SearchManager) getActivity().getSystemService(Context.SEARCH_SERVICE);
SearchView searchView = (SearchView) menu.findItem(R.id.action_search).getActionView();
searchView.setSearchableInfo(searchManager.getSearchableInfo(getActivity().getComponentName()));
searchView.setIconifiedByDefault(false);
SearchView.OnQueryTextListener textChangeListener = new SearchView.OnQueryTextListener()
{
@Override
public boolean onQueryTextChange(String newText)
{
// this is your adapter that will be filtered
myAdapter.getFilter().filter(newText);
System.out.println("on text chnge text: "+newText);
return true;
}
@Override
public boolean onQueryTextSubmit(String query)
{
// this is your adapter that will be filtered
myAdapter.getFilter().filter(query);
System.out.println("on query submit: "+query);
return true;
}
};
searchView.setOnQueryTextListener(textChangeListener);
}
/**....rest of your code*/
}
编辑3:
以下是完整的演示:
你的问题不太清楚。这将有助于明确定义问题,并可能缩小发布的代码。目前情况还不错,但可能与您的问题无关。我认为您的设置存在更大的问题。您正在访问活动中的搜索代码,但适配器属于您的片段。实际上,您可以通过调用片段中的onCreateOptionsMenuMenu菜单(而不是活动)来访问片段中的搜索视图。请不要按原样复制。这对你来说只是一个起点。系统服务只能通过上下文访问。我会更新它,但您可能需要通过完整的教程才能正确地实现它。过滤器不是一个小部件。这是你必须实现的东西,请仔细阅读教程。适配器需要实现Filterable才能调用getFilterI实际上是指搜索视图小部件,但这对操作栏中的搜索视图有效吗?是的,因为片段通过调用自己的OnCreateOptions MenuMenu菜单MenuInflater来定义操作菜单
public class FragmentVictoriaLine extends android.support.v4.app.Fragment implements {
private class Victoria {
private CharSequence station;
private CharSequence zone;
private Class<? extends Activity> activityClass;
private Class<? extends android.support.v4.app.Fragment> fragmentClass;
public Victoria(int stationResId, int zoneResId, Class<? extends Activity> activityClass, Class<? extends android.support.v4.app.Fragment> fragmentClass) {
this.fragmentClass = fragmentClass;
this.activityClass = activityClass;
this.station = getResources().getString(stationResId);
this.zone = getResources().getString(zoneResId);
}
@Override
public String toString() { return station.toString(); }
public String getzone(){ return zone.toString(); }
}
private static Victoria[] mVictoria;
/**
* Whether or not the activity is in two-pane mode, i.e. running on a tablet
* device.
*/
public boolean mTwoPane;
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
View v = inflater.inflate(R.layout.fragment_victoria_line, container, false);
if (getActivity().findViewById(R.id.detail_container) != null) {
mTwoPane = true;
}else{
mTwoPane = false;
}
// Instantiate the list of stations.
mVictoria = new Victoria[]{
new Victoria(R.string.bank, R.string.zone_1, WCBankActivity.class, FragmentWCBank.class),
new Victoria(R.string.wat, R.string.zone_1, WCWATActivity.class, FragmentWCWAT.class)
};
final ListView listView = (ListView)v.findViewById(R.id.list_victoria);
listView.setAdapter(new MyAdapter(getActivity(), mVictoria));
listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
listView.setTextFilterEnabled(true);
});
return v;
}
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
setHasOptionsMenu(true);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu items for use in the action bar
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu_victoria_line, menu);
// Associate searchable configuration with the SearchView
SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
SearchView searchView = (SearchView) menu.findItem(R.id.action_search).getActionView();
searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
searchView.setIconifiedByDefault(false);
android.support.v7.widget.SearchView.OnQueryTextListener textChangeListener = new android.support.v7.widget.SearchView.OnQueryTextListener()
{
@Override
public boolean onQueryTextChange(String newText)
{
// this is your adapter that will be filtered
myAdapter.getFilter().filter(newText);
return true;
}
@Override
public boolean onQueryTextSubmit(String query)
{
// this is your adapter that will be filtered
myAdapter.getFilter().filter(query);
return true;
}
};
searchView.setOnQueryTextListener(textChangeListener);
return super.onCreateOptionsMenu(menu);
}
static class MyAdapter extends BaseAdapter {
static class ViewHolder {
TextView station;
TextView zone;
}
LayoutInflater inflater;
Victoria[] mVictoria;
public MyAdapter(Context contexts, Victoria[] samples) {
this.mVictoria = samples;
inflater = LayoutInflater.from(contexts);
}
@Override
public int getCount() {
return mVictoria.length;
}
@Override
public Object getItem(int position) {
return mVictoria[position];
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.list_item_dualline, null);
viewHolder = new ViewHolder();
viewHolder.station = (TextView) convertView.findViewById(R.id.list_item_station);
viewHolder.zone = (TextView) convertView.findViewById(R.id.list_item_zone);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.station.setText(mVictoria[position].station);
viewHolder.zone.setText(mVictoria[position].getzone());
return convertView;
}
}
}
public class FragmentVictoriaLine extends Fragment {
/**Declare other variables**/
private MyAdapter myAdapter;
public FragmentVictoriaLine() {
// Required empty public constructor
}
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_victoria_line, container, false);
//Tell the system to call onCreateOptinsMenu
setHasOptionsMenu(true);
if (getActivity().findViewById(R.id.detail_container) != null) {
mTwoPane = true;
} else {
mTwoPane = false;
}
mVictoria = new Victoria[]{
new Victoria(R.string.bank, R.string.zone_1, WCBankActivity.class, FragmentWCBank.class),
new Victoria(R.string.wat, R.string.zone_1, WCWATActivity.class, FragmentWCWAT.class)
};
//Declare your adapter here so you can access later
myAdapter = new MyAdapter(getActivity(), mVictoria);
final ListView listView = (ListView) v.findViewById(R.id.list_victoria);
//Set teh adapter here.
listView.setAdapter(myAdapter);
listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
listView.setTextFilterEnabled(true);
return v;
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
// Inflate the menu items for use in the action bar
inflater.inflate(R.menu.menu_victoria_line, menu);
// Associate searchable configuration with the SearchView
SearchManager searchManager = (SearchManager) getActivity().getSystemService(Context.SEARCH_SERVICE);
SearchView searchView = (SearchView) menu.findItem(R.id.action_search).getActionView();
searchView.setSearchableInfo(searchManager.getSearchableInfo(getActivity().getComponentName()));
searchView.setIconifiedByDefault(false);
SearchView.OnQueryTextListener textChangeListener = new SearchView.OnQueryTextListener()
{
@Override
public boolean onQueryTextChange(String newText)
{
// this is your adapter that will be filtered
myAdapter.getFilter().filter(newText);
System.out.println("on text chnge text: "+newText);
return true;
}
@Override
public boolean onQueryTextSubmit(String query)
{
// this is your adapter that will be filtered
myAdapter.getFilter().filter(query);
System.out.println("on query submit: "+query);
return true;
}
};
searchView.setOnQueryTextListener(textChangeListener);
}
/**....rest of your code*/
}