在我的主活动文件中，我有两个类，我想移出到新文件（只是为了清理代码）。这两个类是AdapterForPostsListView和PostFilter。我尝试使用Eclipse的“Refractor” - ＆gt; “将类型移动到新文件”但它生成错误，因为在主/父活动中定义了一些变量。
public class Amawal extends SherlockActivity {
// Declare Variables
ListView list;
EditText editsearch;
private List<Post> wp_posts = null;
private AdapterForPostsListView dataAdapter = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.home_activity);
// Initialise DB; copy it from assets to system if not already done.
AmawalDB db = new AmawalDB(this, null, 1);
db.initialise();
wp_posts = db.getAllPosts();
populateListView();
registerClickCallback();
}
private void populateListView() {
// create an ArrayAdaptar from the Posts object
dataAdapter = new AdapterForPostsListView(this, R.layout.item_view, wp_posts);
ListView list = (ListView) findViewById(R.id.posts_container_listview);
// Assign adapter to ListView
list.setAdapter(dataAdapter);
// enables filtering for the contents of the given ListView
list.setTextFilterEnabled(true);
}
/*
* http://www.mysamplecode.com/2012/07/android-listview-custom-layout-filter.
* html
*/
private class AdapterForPostsListView extends ArrayAdapter<Post> {
private ArrayList<Post> originalList;
private ArrayList<Post> newList;
private PostFilter filter;
public AdapterForPostsListView(Context context, int textViewResourceId, List<Post> countryList) {
super(context, textViewResourceId, countryList);
this.newList = new ArrayList<Post>();
this.newList.addAll(countryList);
this.originalList = new ArrayList<Post>();
this.originalList.addAll(countryList);
}
@Override
public Filter getFilter() {
if (filter == null) {
filter = new PostFilter();
}
return filter;
}
private class ViewHolder {
TextView holder_post_title;
TextView holder_post_content;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
Log.v("ConvertView", String.valueOf(position));
if (convertView == null) {
LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = vi.inflate(R.layout.item_view, null);
holder = new ViewHolder();
holder.holder_post_title = (TextView) convertView.findViewById(R.id.item_postTitle);
holder.holder_post_content = (TextView) convertView.findViewById(R.id.item_postContent);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
Post post = newList.get(position);
holder.holder_post_title.setText(post.getpostTitle());
holder.holder_post_content.setText(post.getPostContent());
return convertView;
}
private class PostFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
constraint = constraint.toString().toLowerCase(Locale.getDefault());
FilterResults result = new FilterResults();
if (constraint != null && constraint.toString().length() > 0) {
ArrayList<Post> filteredItems = new ArrayList<Post>();
for (int i = 0, l = originalList.size(); i < l; i++) {
Post post = originalList.get(i);
if (post.toString().toLowerCase(Locale.getDefault()).contains(constraint))
filteredItems.add(post);
}
result.count = filteredItems.size();
result.values = filteredItems;
} else {
synchronized (this) {
result.values = originalList;
result.count = originalList.size();
}
}
return result;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
newList = (ArrayList<Post>) results.values;
notifyDataSetChanged();
clear();
for (int i = 0, l = newList.size(); i < l; i++)
add(newList.get(i));
notifyDataSetInvalidated();
}
}
}
private void registerClickCallback() {
ListView list = (ListView) findViewById(R.id.posts_container_listview);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View viewClicked, int position, long id) {
Post clickedPost = wp_posts.get(position);
// New intent
Intent i = new Intent(Amawal.this, SinglePost.class);
int ID = clickedPost.getID();
String message = "You clicked position " + position + " Which is ID " + ID;
Toast.makeText(Amawal.this, message, Toast.LENGTH_LONG).show();
// supply a Tag
i.putExtra("ID", ID);
// launch activity
startActivity(i);
}
});
}
// Create the options menu
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Get the options menu view from menu.xml in menu folder
getSupportMenuInflater().inflate(R.menu.menu, menu);
// Locate the EditText in menu.xml
editsearch = (EditText) menu.findItem(R.id.menu_search).getActionView();
// Listen to search text change
editsearch.addTextChangedListener(new TextWatcher() {
@Override
public void afterTextChanged(Editable s) {
String text = editsearch.getText().toString().toLowerCase(Locale.getDefault());
dataAdapter.getFilter().filter(text);
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
}
@Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
}
});
// Show the search menu item in menu.xml
MenuItem menuSearch = menu.findItem(R.id.menu_search);
menuSearch.setOnActionExpandListener(new OnActionExpandListener() {
// Menu Action Collapse
@Override
public boolean onMenuItemActionCollapse(MenuItem item) {
// Empty EditText to remove text filtering
editsearch.setText("");
editsearch.clearFocus();
return true;
}
// Menu Action Expand
@Override
public boolean onMenuItemActionExpand(MenuItem item) {
// Focus on EditText
editsearch.requestFocus();
// Force the keyboard to show on EditText focus
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);
return true;
}
});
// Show the about us menu item in menu.xml
MenuItem menuAbout = menu.findItem(R.id.menu_about);
// Capture the about menu click
menuAbout.setOnMenuItemClickListener(new OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem item) {
// TODO Auto-generated method stub
// Open the about us activity
Toast.makeText(getApplicationContext(), "Nothing here!", Toast.LENGTH_LONG).show();
return false;
}
});
return true;
}
@Override
protected void onDestroy() {
super.onDestroy();
// Close the database here
}
}
由于我是Java的OOP的新手，我在使用新创建的类时遇到了问题:(
答案 0 :(得分：0)
将一个构造函数添加到要移出的类中，这些类将从父类中获取所需的变量作为参数。将这些值存储为其方法可以访问的该类的成员变量。
例如，如果我们为了简单起见假设只需要传递originalList：
class PostFilter extends Filter {
private ArrayList<Post> originalList;
public PostFilter(ArrayList<Post> originalList) {
this.originalList = originalList;
}
...