/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.widget;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.text.Editable;
import android.text.Selection;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.util.Log;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.CompletionInfo;
import android.view.inputmethod.InputMethodManager;
import android.view.inputmethod.EditorInfo;
import com.android.internal.R;
/**
* <p>An editable text view that shows completion suggestions automatically
* while the user is typing. The list of suggestions is displayed in a drop
* down menu from which the user can choose an item to replace the content
* of the edit box with.</p>
*
* <p>The drop down can be dismissed at any time by pressing the back key or,
* if no item is selected in the drop down, by pressing the enter/dpad center
* key.</p>
*
* <p>The list of suggestions is obtained from a data adapter and appears
* only after a given number of characters defined by
* {@link #getThreshold() the threshold}.</p>
*
* <p>The following code snippet shows how to create a text view which suggests
* various countries names while the user is typing:</p>
*
* <pre class="prettyprint">
* public class CountriesActivity extends Activity {
* protected void onCreate(Bundle icicle) {
* super.onCreate(icicle);
* setContentView(R.layout.countries);
*
* ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
* android.R.layout.simple_dropdown_item_1line, COUNTRIES);
* AutoCompleteTextView textView = (AutoCompleteTextView)
* findViewById(R.id.countries_list);
* textView.setAdapter(adapter);
* }
*
* private static final String[] COUNTRIES = new String[] {
* "Belgium", "France", "Italy", "Germany", "Spain"
* };
* }
* </pre>
*
* @attr ref android.R.styleable#AutoCompleteTextView_completionHint
* @attr ref android.R.styleable#AutoCompleteTextView_completionThreshold
* @attr ref android.R.styleable#AutoCompleteTextView_completionHintView
* @attr ref android.R.styleable#AutoCompleteTextView_dropDownSelector
* @attr ref android.R.styleable#AutoCompleteTextView_dropDownAnchor
* @attr ref android.R.styleable#AutoCompleteTextView_dropDownWidth
*/
public class AutoCompleteTextView extends EditText implements Filter.FilterListener {
static final boolean DEBUG = false;
static final String TAG = "AutoCompleteTextView";
private static final int HINT_VIEW_ID = 0x17;
private CharSequence mHintText;
private int mHintResource;
private ListAdapter mAdapter;
private Filter mFilter;
private int mThreshold;
private PopupWindow mPopup;
private DropDownListView mDropDownList;
private int mDropDownVerticalOffset;
private int mDropDownHorizontalOffset;
private int mDropDownAnchorId;
private View mDropDownAnchorView; // view is retrieved lazily from id once needed
private int mDropDownWidth;
private Drawable mDropDownListHighlight;
private AdapterView.OnItemClickListener mItemClickListener;
private AdapterView.OnItemSelectedListener mItemSelectedListener;
private final DropDownItemClickListener mDropDownItemClickListener =
new DropDownItemClickListener();
private int mLastKeyCode = KeyEvent.KEYCODE_UNKNOWN;
private boolean mOpenBefore;
private Validator mValidator = null;
private boolean mBlockCompletion;
private AutoCompleteTextView.ListSelectorHider mHideSelector;
// Indicates whether this AutoCompleteTextView is attached to a window or not
// The widget is attached to a window when mAttachCount > 0
private int mAttachCount;
public AutoCompleteTextView(Context context) {
this(context, null);
}
public AutoCompleteTextView(Context context, AttributeSet attrs) {
this(context, attrs, com.android.internal.R.attr.autoCompleteTextViewStyle);
}
public AutoCompleteTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mPopup = new PopupWindow(context, attrs,
com.android.internal.R.attr.autoCompleteTextViewStyle);
TypedArray a =
context.obtainStyledAttributes(
attrs, com.android.internal.R.styleable.AutoCompleteTextView, defStyle, 0);
mThreshold = a.getInt(
R.styleable.AutoCompleteTextView_completionThreshold, 2);
mHintText = a.getText(R.styleable.AutoCompleteTextView_completionHint);
mDropDownListHighlight = a.getDrawable(
R.styleable.AutoCompleteTextView_dropDownSelector);
mDropDownVerticalOffset = (int)
a.getDimension(R.styleable.AutoCompleteTextView_dropDownVerticalOffset, 0.0f);
mDropDownHorizontalOffset = (int)
a.getDimension(R.styleable.AutoCompleteTextView_dropDownHorizontalOffset, 0.0f);
// Get the anchor's id now, but the view won't be ready, so wait to actually get the
// view and store it in mDropDownAnchorView lazily in getDropDownAnchorView later.
// Defaults to NO_ID, in which case the getDropDownAnchorView method will simply return
// this TextView, as a default anchoring point.
mDropDownAnchorId = a.getResourceId(R.styleable.AutoCompleteTextView_dropDownAnchor,
View.NO_ID);
// For dropdown width, the developer can specify a specific width, or FILL_PARENT
// (for full screen width) or WRAP_CONTENT (to match the width of the anchored view).
mDropDownWidth = a.getLayoutDimension(R.styleable.AutoCompleteTextView_dropDownWidth,
ViewGroup.LayoutParams.WRAP_CONTENT);
mHintResource = a.getResourceId(R.styleable.AutoCompleteTextView_completionHintView,
R.layout.simple_dropdown_hint);
// Always turn on the auto complete input type flag, since it
// makes no sense to use this widget without it.
int inputType = getInputType();
if ((inputType&EditorInfo.TYPE_MASK_CLASS)
== EditorInfo.TYPE_CLASS_TEXT) {
inputType |= EditorInfo.TYPE_TEXT_FLAG_AUTO_COMPLETE;
setRawInputType(inputType);
}
a.recycle();
setFocusable(true);
addTextChangedListener(new MyWatcher());
}
/**
* Sets this to be single line; a separate method so
* MultiAutoCompleteTextView can skip this.
*/
/* package */ void finishInit() {
setSingleLine();
}
/**
* <p>Sets the optional hint text that is displayed at the bottom of the
* the matching list. This can be used as a cue to the user on how to
* best use the list, or to provide extra information.</p>
*
* @param hint the text to be displayed to the user
*
* @attr ref android.R.styleable#AutoCompleteTextView_completionHint
*/
public void setCompletionHint(CharSequence hint) {
mHintText = hint;
}
/**
* <p>Returns the current width for the auto-complete drop down list. This can
* be a fixed width, or {@link ViewGroup.LayoutParams#FILL_PARENT} to fill the screen, or
* {@link ViewGroup.LayoutParams#WRAP_CONTENT} to fit the width of its anchor view.</p>
*
* @return the width for the drop down list
*/
public int getDropDownWidth() {
return mDropDownWidth;
}
/**
* <p>Sets the current width for the auto-complete drop down list. This can
* be a fixed width, or {@link ViewGroup.LayoutParams#FILL_PARENT} to fill the screen, or
* {@link ViewGroup.LayoutParams#WRAP_CONTENT} to fit the width of its anchor view.</p>
*
* @param width the width to use
*/
public void setDropDownWidth(int width) {
mDropDownWidth = width;
}
/**
* <p>Returns the id for the view that the auto-complete drop down list is anchored to.</p>
*
* @return the view's id, or {@link View#NO_ID} if none specified
*/
public int getDropDownAnchor() {
return mDropDownAnchorId;
}
/**
* <p>Sets the view to which the auto-complete drop down list should anchor. The view
* corresponding to this id will not be loaded until the next time it is needed to avoid
* loading a view which is not yet instantiated.</p>
*
* @param id the id to anchor the drop down list view to
*/
public void setDropDownAnchor(int id) {
mDropDownAnchorId = id;
mDropDownAnchorView = null;
}
/**
* <p>Returns the number of characters the user must type before the drop
* down list is shown.</p>
*
* @return the minimum number of characters to type to show the drop down
*
* @see #setThreshold(int)
*/
public int getThreshold() {
return mThreshold;
}
/**
* <p>Specifies the minimum number of characters the user has to type in the
* edit box before the drop down list is shown.</p>
*
* <p>When <code>threshold</code> is less than or equals 0, a threshold of
* 1 is applied.</p>
*
* @param threshold the number of characters to type before the drop down
* is shown
*
* @see #getThreshold()
*
* @attr ref android.R.styleable#AutoCompleteTextView_completionThreshold
*/
public void setThreshold(int threshold) {
if (threshold <= 0) {
threshold = 1;
}
mThreshold = threshold;
}
/**
* <p>Sets the listener that will be notified when the user clicks an item
* in the drop down list.</p>
*
* @param l the item click listener
*/
public void setOnItemClickListener(AdapterView.OnItemClickListener l) {
mItemClickListener = l;
}
/**
* <p>Sets the listener that will be notified when the user selects an item
* in the drop down list.</p>
*
* @param l the item selected listener
*/
public void setOnItemSelectedListener(AdapterView.OnItemSelectedListener l) {
mItemSelectedListener = l;
}
/**
* <p>Returns the listener that is notified whenever the user clicks an item
* in the drop down list.</p>
*
* @return the item click listener
*
* @deprecated Use {@link #getOnItemClickListener()} intead
*/
@Deprecated
public AdapterView.OnItemClickListener getItemClickListener() {
return mItemClickListener;
}
/**
* <p>Returns the listener that is notified whenever the user selects an
* item in the drop down list.</p>
*
* @return the item selected listener
*
* @deprecated Use {@link #getOnItemSelectedListener()} intead
*/
@Deprecated
public AdapterView.OnItemSelectedListener getItemSelectedListener() {
return mItemSelectedListener;
}
/**
* <p>Returns the listener that is notified whenever the user clicks an item
* in the drop down list.</p>
*
* @return the item click listener
*/
public AdapterView.OnItemClickListener getOnItemClickListener() {
return mItemClickListener;
}
/**
* <p>Returns the listener that is notified whenever the user selects an
* item in the drop down list.</p>
*
* @return the item selected listener
*/
public AdapterView.OnItemSelectedListener getOnItemSelectedListener() {
return mItemSelectedListener;
}
/**
* <p>Returns a filterable list adapter used for auto completion.</p>
*
* @return a data adapter used for auto completion
*/
public ListAdapter getAdapter() {
return mAdapter;
}
/**
* <p>Changes the list of data used for auto completion. The provided list
* must be a filterable list adapter.</p>
*
* <p>The caller is still responsible for managing any resources used by the adapter.
* Notably, when the AutoCompleteTextView is closed or released, the adapter is not notified.
* A common case is the use of {@link android.widget.CursorAdapter}, which
* contains a {@link android.database.Cursor} that must be closed. This can be done
* automatically (see
* {@link android.app.Activity#startManagingCursor(android.database.Cursor)
* startManagingCursor()}),
* or by manually closing the cursor when the AutoCompleteTextView is dismissed.</p>
*
* @param adapter the adapter holding the auto completion data
*
* @see #getAdapter()
* @see android.widget.Filterable
* @see android.widget.ListAdapter
*/
public <T extends ListAdapter & Filterable> void setAdapter(T adapter) {
mAdapter = adapter;
if (mAdapter != null) {
//noinspection unchecked
mFilter = ((Filterable) mAdapter).getFilter();
} else {
mFilter = null;
}
if (mDropDownList != null) {
mDropDownList.setAdapter(mAdapter);
}
}
@Override
public boolean onKeyPreIme(int keyCode, KeyEvent event) {
if (isPopupShowing()) {
// special case for the back key, we do not even try to send it
// to the drop down list but instead, consume it immediately
if (keyCode == KeyEvent.KEYCODE_BACK) {
dismissDropDown();
return true;
}
}
return super.onKeyPreIme(keyCode, event);
}
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
if (isPopupShowing() && mDropDownList.getSelectedItemPosition() >= 0) {
boolean consumed = mDropDownList.onKeyUp(keyCode, event);
if (consumed) {
switch (keyCode) {
// if the list accepts the key events and the key event
// was a click, the text view gets the selected item
// from the drop down as its content
case KeyEvent.KEYCODE_ENTER:
case KeyEvent.KEYCODE_DPAD_CENTER:
performCompletion();
return true;
}
}
}
return super.onKeyUp(keyCode, event);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// when the drop down is shown, we drive it directly
if (isPopupShowing()) {
// the key events are forwarded to the list in the drop down view
// note that ListView handles space but we don't want that to happen
// also if selection is not currently in the drop down, then don't
// let center or enter presses go there since that would cause it
// to select one of its items
if (keyCode != KeyEvent.KEYCODE_SPACE
&& (mDropDownList.getSelectedItemPosition() >= 0
|| (keyCode != KeyEvent.KEYCODE_ENTER
&& keyCode != KeyEvent.KEYCODE_DPAD_CENTER))) {
int curIndex = mDropDownList.getSelectedItemPosition();
boolean consumed;
final boolean below = !mPopup.isAboveAnchor();
if ((below && keyCode == KeyEvent.KEYCODE_DPAD_UP && curIndex <= 0) ||
(!below && keyCode == KeyEvent.KEYCODE_DPAD_DOWN && curIndex >=
mDropDownList.getAdapter().getCount() - 1)) {
// When the selection is at the top, we block the key
// event to prevent focus from moving.
mDropDownList.hideSelector();
mDropDownList.requestLayout();
mPopup.setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED);
mPopup.update();
return true;
}
consumed = mDropDownList.onKeyDown(keyCode, event);
if (DEBUG) Log.v(TAG, "Key down: code=" + keyCode + " list consumed="
+ consumed);
if (consumed) {
// If it handled the key event, then the user is
// navigating in the list, so we should put it in front.
mPopup.setInputMethodMode(PopupWindow.INPUT_METHOD_NOT_NEEDED);
// Here's a little trick we need to do to make sure that
// the list view is actually showing its focus indicator,
// by ensuring it has focus and getting its window out
// of touch mode.
mDropDownList.requestFocusFromTouch();
mPopup.update();
switch (keyCode) {
// avoid passing the focus from the text view to the
// next component
case KeyEvent.KEYCODE_ENTER:
case KeyEvent.KEYCODE_DPAD_CENTER:
case KeyEvent.KEYCODE_DPAD_DOWN:
case KeyEvent.KEYCODE_DPAD_UP:
return true;
}
} else {
if (below && keyCode == KeyEvent.KEYCODE_DPAD_DOWN) {
// when the selection is at the bottom, we block the
// event to avoid going to the next focusable widget
Adapter adapter = mDropDownList.getAdapter();
if (adapter != null && curIndex == adapter.getCount() - 1) {
return true;
}
} else if (!below && keyCode == KeyEvent.KEYCODE_DPAD_UP && curIndex == 0) {
return true;
}
}
}
} else {
switch(keyCode) {
case KeyEvent.KEYCODE_DPAD_DOWN:
performValidation();
}
}
mLastKeyCode = keyCode;
boolean handled = super.onKeyDown(keyCode, event);
mLastKeyCode = KeyEvent.KEYCODE_UNKNOWN;
if (handled && isPopupShowing() && mDropDownList != null) {
clearListSelection();
}
return handled;
}
/**
* Returns <code>true</code> if the amount of text in the field meets
* or exceeds the {@link #getThreshold} requirement. You can override
* this to impose a different standard for when filtering will be
* triggered.
*/
public boolean enoughToFilter() {
if (DEBUG) Log.v(TAG, "Enough to filter: len=" + getText().length()
+ " threshold=" + mThreshold);
return getText().length() >= mThreshold;
}
/**
* This is used to watch for edits to the text view. Note that we call
* to methods on the auto complete text view class so that we can access
* private vars without going through thunks.
*/
private class MyWatcher implements TextWatcher {
public void afterTextChanged(Editable s) {
doAfterTextChanged();
}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
doBeforeTextChanged();
}
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
}
void doBeforeTextChanged() {
if (mBlockCompletion) return;
// when text is changed, inserted or deleted, we attempt to show
// the drop down
mOpenBefore = isPopupShowing();
if (DEBUG) Log.v(TAG, "before text changed: open=" + mOpenBefore);
}
void doAfterTextChanged() {
if (mBlockCompletion) return;
// if the list was open before the keystroke, but closed afterwards,
// then something in the keystroke processing (an input filter perhaps)
// called performCompletion() and we shouldn't do any more processing.
if (DEBUG) Log.v(TAG, "after text changed: openBefore=" + mOpenBefore
+ " open=" + isPopupShowing());
if (mOpenBefore && !isPopupShowing()) {
return;
}
// the drop down is shown only when a minimum number of characters
// was typed in the text view
if (enoughToFilter()) {
if (mFilter != null) {
performFiltering(getText(), mLastKeyCode);
}
} else {
// drop down is automatically dismissed when enough characters
// are deleted from the text view
dismissDropDown();
if (mFilter != null) {
mFilter.filter(null);
}
}
}
/**
* <p>Indicates whether the popup menu is showing.</p>
*
* @return true if the popup menu is showing, false otherwise
*/
public boolean isPopupShowing() {
return mPopup.isShowing();
}
/**
* <p>Converts the selected item from the drop down list into a sequence
* of character that can be used in the edit box.</p>
*
* @param selectedItem the item selected by the user for completion
*
* @return a sequence of characters representing the selected suggestion
*/
protected CharSequence convertSelectionToString(Object selectedItem) {
return mFilter.convertResultToString(selectedItem);
}
/**
* <p>Clear the list selection. This may only be temporary, as user input will often bring
* it back.
*/
public void clearListSelection() {
if (mDropDownList != null) {
mDropDownList.hideSelector();
mDropDownList.requestLayout();
}
}
/**
* Set the position of the dropdown view selection.
*
* @param position The position to move the selector to.
*/
public void setListSelection(int position) {
if (mPopup.isShowing() && (mDropDownList != null)) {
mDropDownList.setSelection(position);
// ListView.setSelection() will call requestLayout()
}
}
/**
* Get the position of the dropdown view selection, if there is one. Returns
* {@link ListView#INVALID_POSITION ListView.INVALID_POSITION} if there is no dropdown or if
* there is no selection.
*
* @return the position of the current selection, if there is one, or
* {@link ListView#INVALID_POSITION ListView.INVALID_POSITION} if not.
*
* @see ListView#getSelectedItemPosition()
*/
public int getListSelection() {
if (mPopup.isShowing() && (mDropDownList != null)) {
return mDropDownList.getSelectedItemPosition();
}
return ListView.INVALID_POSITION;
}
/**
* We're changing the adapter and its views so really, really clear everything out
* @hide - for SearchDialog only
*/
public void resetListAndClearViews() {
if (mDropDownList != null) {
mDropDownList.resetListAndClearViews();
}
}
/**
* <p>Starts filtering the content of the drop down list. The filtering
* pattern is the content of the edit box. Subclasses should override this
* method to filter with a different pattern, for instance a substring of
* <code>text</code>.</p>
*
* @param text the filtering pattern
* @param keyCode the last character inserted in the edit box; beware that
* this will be null when text is being added through a soft input method.
*/
@SuppressWarnings({ "UnusedDeclaration" })
protected void performFiltering(CharSequence text, int keyCode) {
mFilter.filter(text, this);
}
/**
* <p>Performs the text completion by converting the selected item from
* the drop down list into a string, replacing the text box's content with
* this string and finally dismissing the drop down menu.</p>
*/
public void performCompletion() {
performCompletion(null, -1, -1);
}
@Override
public void onCommitCompletion(CompletionInfo completion) {
if (isPopupShowing()) {
mBlockCompletion = true;
replaceText(completion.getText());
mBlockCompletion = false;
if (mItemClickListener != null) {
final DropDownListView list = mDropDownList;
// Note that we don't have a View here, so we will need to
// supply null. Hopefully no existing apps crash...
mItemClickListener.onItemClick(list, null, completion.getPosition(),
completion.getId());
}
}
}
private void performCompletion(View selectedView, int position, long id) {
if (isPopupShowing()) {
Object selectedItem;
if (position < 0) {
selectedItem = mDropDownList.getSelectedItem();
} else {
selectedItem = mAdapter.getItem(position);
}
if (selectedItem == null) {
Log.w(TAG, "performCompletion: no selected item");
return;
}
mBlockCompletion = true;
replaceText(convertSelectionToString(selectedItem));
mBlockCompletion = false;
if (mItemClickListener != null) {
final DropDownListView list = mDropDownList;
if (selectedView == null || position < 0) {
selectedView = list.getSelectedView();
position = list.getSelectedItemPosition();
id = list.getSelectedItemId();
}
mItemClickListener.onItemClick(list, selectedView, position, id);
}
}
dismissDropDown();
}
/**
* Identifies whether the view is currently performing a text completion, so subclasses
* can decide whether to respond to text changed events.
*/
public boolean isPerformingCompletion() {
return mBlockCompletion;
}
/**
* <p>Performs the text completion by replacing the current text by the
* selected item. Subclasses should override this method to avoid replacing
* the whole content of the edit box.</p>
*
* @param text the selected suggestion in the drop down list
*/
protected void replaceText(CharSequence text) {
setText(text);
// make sure we keep the caret at the end of the text view
Editable spannable = getText();
Selection.setSelection(spannable, spannable.length());
}
public void onFilterComplete(int count) {
if (mAttachCount <= 0) return;
/*
* This checks enoughToFilter() again because filtering requests
* are asynchronous, so the result may come back after enough text
* has since been deleted to make it no longer appropriate
* to filter.
*/
if (count > 0 && enoughToFilter()) {
if (hasFocus() && hasWindowFocus()) {
showDropDown();
}
} else {
dismissDropDown();
}
}
@Override
public void onWindowFocusChanged(boolean hasWindowFocus) {
super.onWindowFocusChanged(hasWindowFocus);
performValidation();
if (!hasWindowFocus) {
dismissDropDown();
}
}
@Override
protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
super.onFocusChanged(focused, direction, previouslyFocusedRect);
performValidation();
if (!focused) {
dismissDropDown();
}
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
mAttachCount++;
}
@Override
protected void onDetachedFromWindow() {
dismissDropDown();
mAttachCount--;
super.onDetachedFromWindow();
}
/**
* <p>Closes the drop down if present on screen.</p>
*/
public void dismissDropDown() {
InputMethodManager imm = InputMethodManager.peekInstance();
if (imm != null) {
imm.displayCompletions(this, null);
}
mPopup.dismiss();
mPopup.setContentView(null);
mDropDownList = null;
}
@Override
protected boolean setFrame(int l, int t, int r, int b) {
boolean result = super.setFrame(l, t, r, b);
if (mPopup.isShowing()) {
mPopup.update(this, r - l, -1);
}
return result;
}
/**
* Set the horizontal offset with respect to {@link #setDropDownAnchor(int)}
* @hide pending API council review
*/
public void setDropDownHorizontalOffset(int horizontalOffset) {
mDropDownHorizontalOffset = horizontalOffset;
}
/**
* Set the vertical offset with respect to {@link #setDropDownAnchor(int)}
* @hide pending API council review
*/
public void setDropDownVerticalOffset(int verticalOffset) {
mDropDownVerticalOffset = verticalOffset;
}
/**
* <p>Used for lazy instantiation of the anchor view from the id we have. If the value of
* the id is NO_ID or we can't find a view for the given id, we return this TextView as
* the default anchoring point.</p>
*/
private View getDropDownAnchorView() {
if (mDropDownAnchorView == null && mDropDownAnchorId != View.NO_ID) {
mDropDownAnchorView = getRootView().findViewById(mDropDownAnchorId);
}
return mDropDownAnchorView == null ? this : mDropDownAnchorView;
}
/**
* <p>Displays the drop down on screen.</p>
*/
public void showDropDown() {
int height = buildDropDown();
if (mPopup.isShowing()) {
int widthSpec;
if (mDropDownWidth == ViewGroup.LayoutParams.FILL_PARENT) {
// The call to PopupWindow's update method below can accept -1 for any
// value you do not want to update.
widthSpec = -1;
} else if (mDropDownWidth == ViewGroup.LayoutParams.WRAP_CONTENT) {
widthSpec = getDropDownAnchorView().getWidth();
} else {
widthSpec = mDropDownWidth;
}
mPopup.update(getDropDownAnchorView(), mDropDownHorizontalOffset,
mDropDownVerticalOffset, widthSpec, height);
} else {
if (mDropDownWidth == ViewGroup.LayoutParams.FILL_PARENT) {
mPopup.setWindowLayoutMode(ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
} else {
mPopup.setWindowLayoutMode(0, ViewGroup.LayoutParams.WRAP_CONTENT);
if (mDropDownWidth == ViewGroup.LayoutParams.WRAP_CONTENT) {
mPopup.setWidth(getDropDownAnchorView().getWidth());
} else {
mPopup.setWidth(mDropDownWidth);
}
}
mPopup.setHeight(height);
mPopup.setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED);
mPopup.setOutsideTouchable(true);
mPopup.setTouchInterceptor(new PopupTouchIntercepter());
mPopup.showAsDropDown(getDropDownAnchorView(),
mDropDownHorizontalOffset, mDropDownVerticalOffset);
mDropDownList.setSelection(ListView.INVALID_POSITION);
mDropDownList.hideSelector();
mDropDownList.requestFocus();
post(mHideSelector);
}
}
/**
* <p>Builds the popup window's content and returns the height the popup
* should have. Returns -1 when the content already exists.</p>
*
* @return the content's height or -1 if content already exists
*/
private int buildDropDown() {
ViewGroup dropDownView;
int otherHeights = 0;
if (mAdapter != null) {
InputMethodManager imm = InputMethodManager.peekInstance();
if (imm != null) {
int N = mAdapter.getCount();
if (N > 20) N = 20;
CompletionInfo[] completions = new CompletionInfo[N];
for (int i = 0; i < N; i++) {
Object item = mAdapter.getItem(i);
long id = mAdapter.getItemId(i);
completions[i] = new CompletionInfo(id, i,
convertSelectionToString(item));
}
imm.displayCompletions(this, completions);
}
}
if (mDropDownList == null) {
Context context = getContext();
mHideSelector = new ListSelectorHider();
mDropDownList = new DropDownListView(context);
mDropDownList.setSelector(mDropDownListHighlight);
mDropDownList.setAdapter(mAdapter);
mDropDownList.setVerticalFadingEdgeEnabled(true);
mDropDownList.setOnItemClickListener(mDropDownItemClickListener);
mDropDownList.setFocusable(true);
mDropDownList.setFocusableInTouchMode(true);
if (mItemSelectedListener != null) {
mDropDownList.setOnItemSelectedListener(mItemSelectedListener);
}
dropDownView = mDropDownList;
View hintView = getHintView(context);
if (hintView != null) {
// if an hint has been specified, we accomodate more space for it and
// add a text view in the drop down menu, at the bottom of the list
LinearLayout hintContainer = new LinearLayout(context);
hintContainer.setOrientation(LinearLayout.VERTICAL);
LinearLayout.LayoutParams hintParams = new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT, 0, 1.0f
);
hintContainer.addView(dropDownView, hintParams);
hintContainer.addView(hintView);
// measure the hint's height to find how much more vertical space
// we need to add to the drop down's height
int widthSpec = MeasureSpec.makeMeasureSpec(getWidth(), MeasureSpec.AT_MOST);
int heightSpec = MeasureSpec.UNSPECIFIED;
hintView.measure(widthSpec, heightSpec);
hintParams = (LinearLayout.LayoutParams) hintView.getLayoutParams();
otherHeights = hintView.getMeasuredHeight() + hintParams.topMargin
+ hintParams.bottomMargin;
dropDownView = hintContainer;
}
mPopup.setContentView(dropDownView);
} else {
dropDownView = (ViewGroup) mPopup.getContentView();
final View view = dropDownView.findViewById(HINT_VIEW_ID);
if (view != null) {
LinearLayout.LayoutParams hintParams =
(LinearLayout.LayoutParams) view.getLayoutParams();
otherHeights = view.getMeasuredHeight() + hintParams.topMargin
+ hintParams.bottomMargin;
}
}
// Max height available on the screen for a popup anchored to us
final int maxHeight = mPopup.getMaxAvailableHeight(this, mDropDownVerticalOffset);
//otherHeights += dropDownView.getPaddingTop() + dropDownView.getPaddingBottom();
return mDropDownList.measureHeightOfChildren(MeasureSpec.UNSPECIFIED,
0, ListView.NO_POSITION, maxHeight - otherHeights, 2) + otherHeights;
}
private View getHintView(Context context) {
if (mHintText != null && mHintText.length() > 0) {
final TextView hintView = (TextView) LayoutInflater.from(context).inflate(
mHintResource, null).findViewById(com.android.internal.R.id.text1);
hintView.setText(mHintText);
hintView.setId(HINT_VIEW_ID);
return hintView;
} else {
return null;
}
}
/**
* Sets the validator used to perform text validation.
*
* @param validator The validator used to validate the text entered in this widget.
*
* @see #getValidator()
* @see #performValidation()
*/
public void setValidator(Validator validator) {
mValidator = validator;
}
/**
* Returns the Validator set with {@link #setValidator},
* or <code>null</code> if it was not set.
*
* @see #setValidator(android.widget.AutoCompleteTextView.Validator)
* @see #performValidation()
*/
public Validator getValidator() {
return mValidator;
}
/**
* If a validator was set on this view and the current string is not valid,
* ask the validator to fix it.
*
* @see #getValidator()
* @see #setValidator(android.widget.AutoCompleteTextView.Validator)
*/
public void performValidation() {
if (mValidator == null) return;
CharSequence text = getText();
if (!TextUtils.isEmpty(text) && !mValidator.isValid(text)) {
setText(mValidator.fixText(text));
}
}
/**
* Returns the Filter obtained from {@link Filterable#getFilter},
* or <code>null</code> if {@link #setAdapter} was not called with
* a Filterable.
*/
protected Filter getFilter() {
return mFilter;
}
private class ListSelectorHider implements Runnable {
public void run() {
if (mDropDownList != null) {
mDropDownList.hideSelector();
mDropDownList.requestLayout();
}
}
}
private class PopupTouchIntercepter implements OnTouchListener {
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
mPopup.setInputMethodMode(PopupWindow.INPUT_METHOD_NOT_NEEDED);
mPopup.update();
}
return false;
}
}
private class DropDownItemClickListener implements AdapterView.OnItemClickListener {
public void onItemClick(AdapterView parent, View v, int position, long id) {
performCompletion(v, position, id);
}
}
/**
* <p>Wrapper class for a ListView. This wrapper hijacks the focus to
* make sure the list uses the appropriate drawables and states when
* displayed on screen within a drop down. The focus is never actually
* passed to the drop down; the list only looks focused.</p>
*/
private static class DropDownListView extends ListView {
/**
* <p>Creates a new list view wrapper.</p>
*
* @param context this view's context
*/
public DropDownListView(Context context) {
super(context, null, com.android.internal.R.attr.dropDownListViewStyle);
}
/**
* <p>Avoids jarring scrolling effect by ensuring that list elements
* made of a text view fit on a single line.</p>
*
* @param position the item index in the list to get a view for
* @return the view for the specified item
*/
@Override
protected View obtainView(int position) {
View view = super.obtainView(position);
if (view instanceof TextView) {
((TextView) view).setHorizontallyScrolling(true);
}
return view;
}
/**
* <p>Returns the top padding of the currently selected view.</p>
*
* @return the height of the top padding for the selection
*/
public int getSelectionPaddingTop() {
return mSelectionTopPadding;
}
/**
* <p>Returns the bottom padding of the currently selected view.</p>
*
* @return the height of the bottom padding for the selection
*/
public int getSelectionPaddingBottom() {
return mSelectionBottomPadding;
}
/**
* <p>Returns the focus state in the drop down.</p>
*
* @return true always
*/
@Override
public boolean hasWindowFocus() {
return true;
}
/**
* <p>Returns the focus state in the drop down.</p>
*
* @return true always
*/
@Override
public boolean isFocused() {
return true;
}
/**
* <p>Returns the focus state in the drop down.</p>
*
* @return true always
*/
@Override
public boolean hasFocus() {
return true;
}
protected int[] onCreateDrawableState(int extraSpace) {
int[] res = super.onCreateDrawableState(extraSpace);
//noinspection ConstantIfStatement
if (false) {
StringBuilder sb = new StringBuilder("Created drawable state: [");
for (int i=0; i<res.length; i++) {
if (i > 0) sb.append(", ");
sb.append("0x");
sb.append(Integer.toHexString(res[i]));
}
sb.append("]");
Log.i(TAG, sb.toString());
}
return res;
}
}
/**
* This interface is used to make sure that the text entered in this TextView complies to
* a certain format. Since there is no foolproof way to prevent the user from leaving
* this View with an incorrect value in it, all we can do is try to fix it ourselves
* when this happens.
*/
public interface Validator {
/**
* Validates the specified text.
*
* @return true If the text currently in the text editor is valid.
*
* @see #fixText(CharSequence)
*/
boolean isValid(CharSequence text);
/**
* Corrects the specified text to make it valid.
*
* @param invalidText A string that doesn't pass validation: isValid(invalidText)
* returns false
*
* @return A string based on invalidText such as invoking isValid() on it returns true.
*
* @see #isValid(CharSequence)
*/
CharSequence fixText(CharSequence invalidText);
}
}