The file containing the source code shown below is located in the corresponding directory in <sdk>/samples/android-<version>/...
/*
* Copyright (C) 2008-2009 The Android开源工程
*
* 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 com.example.android.softkeyboard;
import android.inputmethodservice.InputMethodService;
import android.inputmethodservice.Keyboard;
import android.inputmethodservice.KeyboardView;
import android.text.InputType;
import android.text.method.MetaKeyKeyListener;
import android.view.KeyCharacterMap;
import android.view.KeyEvent;
import android.view.View;
import android.view.inputmethod.CompletionInfo;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputConnection;
import android.view.inputmethod.InputMethodManager;
import android.view.inputmethod.InputMethodSubtype;
import java.util.ArrayList;
import java.util.List;
/**
* Example of writing an input method for a soft keyboard. This code is
* focused on simplicity over completeness, so it should in no way be considered
* to be a complete soft keyboard implementation. Its purpose is to provide
* a basic example for how you would get started writing an input method, to
* be fleshed out as appropriate.
*/
public class SoftKeyboard extends InputMethodService
implements KeyboardView.OnKeyboardActionListener {
static final boolean DEBUG = false;
/**
* This boolean indicates the optional example code for performing
* processing of hard keys in addition to regular text generation
* from on-screen interaction. It would be used for input methods that
* perform language translations (such as converting text entered on
* a QWERTY keyboard to Chinese), but may not be used for input methods
* that are primarily intended to be used for on-screen text entry.
*/
static final boolean PROCESS_HARD_KEYS = true;
private InputMethodManager mInputMethodManager;
private LatinKeyboardView mInputView;
private CandidateView mCandidateView;
private CompletionInfo[] mCompletions;
private StringBuilder mComposing = new StringBuilder();
private boolean mPredictionOn;
private boolean mCompletionOn;
private int mLastDisplayWidth;
private boolean mCapsLock;
private long mLastShiftTime;
private long mMetaState;
private LatinKeyboard mSymbolsKeyboard;
private LatinKeyboard mSymbolsShiftedKeyboard;
private LatinKeyboard mQwertyKeyboard;
private LatinKeyboard mCurKeyboard;
private String mWordSeparators;
/**
* Main initialization of the input method component. Be sure to call
* to super class.
*/
@Override public void onCreate() {
super.onCreate();
mInputMethodManager = (InputMethodManager)getSystemService(INPUT_METHOD_SERVICE);
mWordSeparators = getResources().getString(R.string.word_separators);
}
/**
* This is the point where you can do all of your UI initialization. It
* is called after creation and any configuration change.
*/
@Override public void onInitializeInterface() {
if (mQwertyKeyboard != null) {
// Configuration changes can happen after the keyboard gets recreated,
// so we need to be able to re-build the keyboards if the available
// space has changed.
int displayWidth = getMaxWidth();
if (displayWidth == mLastDisplayWidth) return;
mLastDisplayWidth = displayWidth;
}
mQwertyKeyboard = new LatinKeyboard(this, R.xml.qwerty);
mSymbolsKeyboard = new LatinKeyboard(this, R.xml.symbols);
mSymbolsShiftedKeyboard = new LatinKeyboard(this, R.xml.symbols_shift);
}
/**
* Called by the framework when your view for creating input needs to
* be generated. This will be called the first time your input method
* is displayed, and every time it needs to be re-created such as due to
* a configuration change.
*/
@Override public View onCreateInputView() {
mInputView = (LatinKeyboardView) getLayoutInflater().inflate(
R.layout.input, null);
mInputView.setOnKeyboardActionListener(this);
mInputView.setKeyboard(mQwertyKeyboard);
return mInputView;
}
/**
* Called by the framework when your view for showing candidates needs to
* be generated, like {@link #onCreateInputView}.
*/
@Override public View onCreateCandidatesView() {
mCandidateView = new CandidateView(this);
mCandidateView.setService(this);
return mCandidateView;
}
/**
* This is the main point where we do our initialization of the input method
* to begin operating on an application. At this point we have been
* bound to the client, and are now receiving all of the detailed information
* about the target of our edits.
*/
@Override public void onStartInput(EditorInfo attribute, boolean restarting) {
super.onStartInput(attribute, restarting);
// Reset our state. We want to do this even if restarting, because
// the underlying state of the text editor could have changed in any way.
mComposing.setLength(0);
updateCandidates();
if (!restarting) {
// Clear shift states.
mMetaState = 0;
}
mPredictionOn = false;
mCompletionOn = false;
mCompletions = null;
// We are now going to initialize our state based on the type of
// text being edited.
switch (attribute.inputType & InputType.TYPE_MASK_CLASS) {
case InputType.TYPE_CLASS_NUMBER:
case InputType.TYPE_CLASS_DATETIME:
// Numbers and dates default to the symbols keyboard, with
// no extra features.
mCurKeyboard = mSymbolsKeyboard;
break;
case InputType.TYPE_CLASS_PHONE:
// Phones will also default to the symbols keyboard, though
// often you will want to have a dedicated phone keyboard.
mCurKeyboard = mSymbolsKeyboard;
break;
case InputType.TYPE_CLASS_TEXT:
// This is general text editing. We will default to the
// normal alphabetic keyboard, and assume that we should
// be doing predictive text (showing candidates as the
// user types).
mCurKeyboard = mQwertyKeyboard;
mPredictionOn = true;
// We now look for a few special variations of text that will
// modify our behavior.
int variation = attribute.inputType & InputType.TYPE_MASK_VARIATION;
if (variation == InputType.TYPE_TEXT_VARIATION_PASSWORD ||
variation == InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD) {
// Do not display predictions / what the user is typing
// when they are entering a password.
mPredictionOn = false;
}
if (variation == InputType.TYPE_TEXT_VARIATION_EMAIL_ADDRESS
|| variation == InputType.TYPE_TEXT_VARIATION_URI
|| variation == InputType.TYPE_TEXT_VARIATION_FILTER) {
// Our predictions are not useful for e-mail addresses
// or URIs.
mPredictionOn = false;
}
if ((attribute.inputType & InputType.TYPE_TEXT_FLAG_AUTO_COMPLETE) != 0) {
// If this is an auto-complete text view, then our predictions
// will not be shown and instead we will allow the editor
// to supply their own. We only show the editor's
// candidates when in fullscreen mode, otherwise relying
// own it displaying its own UI.
mPredictionOn = false;
mCompletionOn = isFullscreenMode();
}
// We also want to look at the current state of the editor
// to decide whether our alphabetic keyboard should start out
// shifted.
updateShiftKeyState(attribute);
break;
default:
// For all unknown input types, default to the alphabetic
// keyboard with no special features.
mCurKeyboard = mQwertyKeyboard;
updateShiftKeyState(attribute);
}
// Update the label on the enter key, depending on what the application
// says it will do.
mCurKeyboard.setImeOptions(getResources(), attribute.imeOptions);
}
/**
* This is called when the user is done editing a field. We can use
* this to reset our state.
*/
@Override public void onFinishInput() {
super.onFinishInput();
// Clear current composing text and candidates.
mComposing.setLength(0);
updateCandidates();
// We only hide the candidates window when finishing input on
// a particular editor, to avoid popping the underlying application
// up and down if the user is entering text into the bottom of
// its window.
setCandidatesViewShown(false);
mCurKeyboard = mQwertyKeyboard;
if (mInputView != null) {
mInputView.closing();
}
}
@Override public void onStartInputView(EditorInfo attribute, boolean restarting) {
super.onStartInputView(attribute, restarting);
// Apply the selected keyboard to the input view.
mInputView.setKeyboard(mCurKeyboard);
mInputView.closing();
final InputMethodSubtype subtype = mInputMethodManager.getCurrentInputMethodSubtype();
mInputView.setSubtypeOnSpaceKey(subtype);
}
@Override
public void onCurrentInputMethodSubtypeChanged(InputMethodSubtype subtype) {
mInputView.setSubtypeOnSpaceKey(subtype);
}
/**
* Deal with the editor reporting movement of its cursor.
*/
@Override public void onUpdateSelection(int oldSelStart, int oldSelEnd,
int newSelStart, int newSelEnd,
int candidatesStart, int candidatesEnd) {
super.onUpdateSelection(oldSelStart, oldSelEnd, newSelStart, newSelEnd,
candidatesStart, candidatesEnd);
// If the current selection in the text view changes, we should
// clear whatever candidate text we have.
if (mComposing.length() > 0 && (newSelStart != candidatesEnd
|| newSelEnd != candidatesEnd)) {
mComposing.setLength(0);
updateCandidates();
InputConnection ic = getCurrentInputConnection();
if (ic != null) {
ic.finishComposingText();
}
}
}
/**
* This tells us about completions that the editor has determined based
* on the current text in it. We want to use this in fullscreen mode
* to show the completions ourself, since the editor can not be seen
* in that situation.
*/
@Override public void onDisplayCompletions(CompletionInfo[] completions) {
if (mCompletionOn) {
mCompletions = completions;
if (completions == null) {
setSuggestions(null, false, false);
return;
}
List<String> stringList = new ArrayList<String>();
for (int i = 0; i < completions.length; i++) {
CompletionInfo ci = completions[i];
if (ci != null) stringList.add(ci.getText().toString());
}
setSuggestions(stringList, true, true);
}
}
/**
* This translates incoming hard key events in to edit operations on an
* InputConnection. It is only needed when using the
* PROCESS_HARD_KEYS option.
*/
private boolean translateKeyDown(int keyCode, KeyEvent event) {
mMetaState = MetaKeyKeyListener.handleKeyDown(mMetaState,
keyCode, event);
int c = event.getUnicodeChar(MetaKeyKeyListener.getMetaState(mMetaState));
mMetaState = MetaKeyKeyListener.adjustMetaAfterKeypress(mMetaState);
InputConnection ic = getCurrentInputConnection();
if (c == 0 || ic == null) {
return false;
}
boolean dead = false;
if ((c & KeyCharacterMap.COMBINING_ACCENT) != 0) {
dead = true;
c = c & KeyCharacterMap.COMBINING_ACCENT_MASK;
}
if (mComposing.length() > 0) {
char accent = mComposing.charAt(mComposing.length() -1 );
int composed = KeyEvent.getDeadChar(accent, c);
if (composed != 0) {
c = composed;
mComposing.setLength(mComposing.length()-1);
}
}
onKey(c, null);
return true;
}
/**
* Use this to monitor key events being delivered to the application.
* We get first crack at them, and can either resume them or let them
* continue to the app.
*/
@Override public boolean onKeyDown(int keyCode, KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_BACK:
// The InputMethodService already takes care of the back
// key for us, to dismiss the input method if it is shown.
// However, our keyboard could be showing a pop-up window
// that back should dismiss, so we first allow it to do that.
if (event.getRepeatCount() == 0 && mInputView != null) {
if (mInputView.handleBack()) {
return true;
}
}
break;
case KeyEvent.KEYCODE_DEL:
// Special handling of the delete key: if we currently are
// composing text for the user, we want to modify that instead
// of let the application to the delete itself.
if (mComposing.length() > 0) {
onKey(Keyboard.KEYCODE_DELETE, null);
return true;
}
break;
case KeyEvent.KEYCODE_ENTER:
// Let the underlying text editor always handle these.
return false;
default:
// For all other keys, if we want to do transformations on
// text being entered with a hard keyboard, we need to process
// it and do the appropriate action.
if (PROCESS_HARD_KEYS) {
if (keyCode == KeyEvent.KEYCODE_SPACE
&& (event.getMetaState()&KeyEvent.META_ALT_ON) != 0) {
// A silly example: in our input method, Alt+Space
// is a shortcut for 'android' in lower case.
InputConnection ic = getCurrentInputConnection();
if (ic != null) {
// First, tell the editor that it is no longer in the
// shift state, since we are consuming this.
ic.clearMetaKeyStates(KeyEvent.META_ALT_ON);
keyDownUp(KeyEvent.KEYCODE_A);
keyDownUp(KeyEvent.KEYCODE_N);
keyDownUp(KeyEvent.KEYCODE_D);
keyDownUp(KeyEvent.KEYCODE_R);
keyDownUp(KeyEvent.KEYCODE_O);
keyDownUp(KeyEvent.KEYCODE_I);
keyDownUp(KeyEvent.KEYCODE_D);
// And we consume this event.
return true;
}
}
if (mPredictionOn && translateKeyDown(keyCode, event)) {
return true;
}
}
}
return super.onKeyDown(keyCode, event);
}
/**
* Use this to monitor key events being delivered to the application.
* We get first crack at them, and can either resume them or let them
* continue to the app.
*/
@Override public boolean onKeyUp(int keyCode, KeyEvent event) {
// If we want to do transformations on text being entered with a hard
// keyboard, we need to process the up events to update the meta key
// state we are tracking.
if (PROCESS_HARD_KEYS) {
if (mPredictionOn) {
mMetaState = MetaKeyKeyListener.handleKeyUp(mMetaState,
keyCode, event);
}
}
return super.onKeyUp(keyCode, event);
}
/**
* Helper function to commit any text being composed in to the editor.
*/
private void commitTyped(InputConnection inputConnection) {
if (mComposing.length() > 0) {
inputConnection.commitText(mComposing, mComposing.length());
mComposing.setLength(0);
updateCandidates();
}
}
/**
* Helper to update the shift state of our keyboard based on the initial
* editor state.
*/
private void updateShiftKeyState(EditorInfo attr) {
if (attr != null
&& mInputView != null && mQwertyKeyboard == mInputView.getKeyboard()) {
int caps = 0;
EditorInfo ei = getCurrentInputEditorInfo();
if (ei != null && ei.inputType != InputType.TYPE_NULL) {
caps = getCurrentInputConnection().getCursorCapsMode(attr.inputType);
}
mInputView.setShifted(mCapsLock || caps != 0);
}
}
/**
* Helper to determine if a given character code is alphabetic.
*/
private boolean isAlphabet(int code) {
if (Character.isLetter(code)) {
return true;
} else {
return false;
}
}
/**
* Helper to send a key down / key up pair to the current editor.
*/
private void keyDownUp(int keyEventCode) {
getCurrentInputConnection().sendKeyEvent(
new KeyEvent(KeyEvent.ACTION_DOWN, keyEventCode));
getCurrentInputConnection().sendKeyEvent(
new KeyEvent(KeyEvent.ACTION_UP, keyEventCode));
}
/**
* Helper to send a character to the editor as raw key events.
*/
private void sendKey(int keyCode) {
switch (keyCode) {
case '\n':
keyDownUp(KeyEvent.KEYCODE_ENTER);
break;
default:
if (keyCode >= '0' && keyCode <= '9') {
keyDownUp(keyCode - '0' + KeyEvent.KEYCODE_0);
} else {
getCurrentInputConnection().commitText(String.valueOf((char) keyCode), 1);
}
break;
}
}
// Implementation of KeyboardViewListener
public void onKey(int primaryCode, int[] keyCodes) {
if (isWordSeparator(primaryCode)) {
// Handle separator
if (mComposing.length() > 0) {
commitTyped(getCurrentInputConnection());
}
sendKey(primaryCode);
updateShiftKeyState(getCurrentInputEditorInfo());
} else if (primaryCode == Keyboard.KEYCODE_DELETE) {
handleBackspace();
} else if (primaryCode == Keyboard.KEYCODE_SHIFT) {
handleShift();
} else if (primaryCode == Keyboard.KEYCODE_CANCEL) {
handleClose();
return;
} else if (primaryCode == LatinKeyboardView.KEYCODE_OPTIONS) {
// Show a menu or somethin'
} else if (primaryCode == Keyboard.KEYCODE_MODE_CHANGE
&& mInputView != null) {
Keyboard current = mInputView.getKeyboard();
if (current == mSymbolsKeyboard || current == mSymbolsShiftedKeyboard) {
current = mQwertyKeyboard;
} else {
current = mSymbolsKeyboard;
}
mInputView.setKeyboard(current);
if (current == mSymbolsKeyboard) {
current.setShifted(false);
}
} else {
handleCharacter(primaryCode, keyCodes);
}
}
public void onText(CharSequence text) {
InputConnection ic = getCurrentInputConnection();
if (ic == null) return;
ic.beginBatchEdit();
if (mComposing.length() > 0) {
commitTyped(ic);
}
ic.commitText(text, 0);
ic.endBatchEdit();
updateShiftKeyState(getCurrentInputEditorInfo());
}
/**
* Update the list of available candidates from the current composing
* text. This will need to be filled in by however you are determining
* candidates.
*/
private void updateCandidates() {
if (!mCompletionOn) {
if (mComposing.length() > 0) {
ArrayList<String> list = new ArrayList<String>();
list.add(mComposing.toString());
setSuggestions(list, true, true);
} else {
setSuggestions(null, false, false);
}
}
}
public void setSuggestions(List<String> suggestions, boolean completions,
boolean typedWordValid) {
if (suggestions != null && suggestions.size() > 0) {
setCandidatesViewShown(true);
} else if (isExtractViewShown()) {
setCandidatesViewShown(true);
}
if (mCandidateView != null) {
mCandidateView.setSuggestions(suggestions, completions, typedWordValid);
}
}
private void handleBackspace() {
final int length = mComposing.length();
if (length > 1) {
mComposing.delete(length - 1, length);
getCurrentInputConnection().setComposingText(mComposing, 1);
updateCandidates();
} else if (length > 0) {
mComposing.setLength(0);
getCurrentInputConnection().commitText("", 0);
updateCandidates();
} else {
keyDownUp(KeyEvent.KEYCODE_DEL);
}
updateShiftKeyState(getCurrentInputEditorInfo());
}
private void handleShift() {
if (mInputView == null) {
return;
}
Keyboard currentKeyboard = mInputView.getKeyboard();
if (mQwertyKeyboard == currentKeyboard) {
// Alphabet keyboard
checkToggleCapsLock();
mInputView.setShifted(mCapsLock || !mInputView.isShifted());
} else if (currentKeyboard == mSymbolsKeyboard) {
mSymbolsKeyboard.setShifted(true);
mInputView.setKeyboard(mSymbolsShiftedKeyboard);
mSymbolsShiftedKeyboard.setShifted(true);
} else if (currentKeyboard == mSymbolsShiftedKeyboard) {
mSymbolsShiftedKeyboard.setShifted(false);
mInputView.setKeyboard(mSymbolsKeyboard);
mSymbolsKeyboard.setShifted(false);
}
}
private void handleCharacter(int primaryCode, int[] keyCodes) {
if (isInputViewShown()) {
if (mInputView.isShifted()) {
primaryCode = Character.toUpperCase(primaryCode);
}
}
if (isAlphabet(primaryCode) && mPredictionOn) {
mComposing.append((char) primaryCode);
getCurrentInputConnection().setComposingText(mComposing, 1);
updateShiftKeyState(getCurrentInputEditorInfo());
updateCandidates();
} else {
getCurrentInputConnection().commitText(
String.valueOf((char) primaryCode), 1);
}
}
private void handleClose() {
commitTyped(getCurrentInputConnection());
requestHideSelf(0);
mInputView.closing();
}
private void checkToggleCapsLock() {
long now = System.currentTimeMillis();
if (mLastShiftTime + 800 > now) {
mCapsLock = !mCapsLock;
mLastShiftTime = 0;
} else {
mLastShiftTime = now;
}
}
private String getWordSeparators() {
return mWordSeparators;
}
public boolean isWordSeparator(int code) {
String separators = getWordSeparators();
return separators.contains(String.valueOf((char)code));
}
public void pickDefaultCandidate() {
pickSuggestionManually(0);
}
public void pickSuggestionManually(int index) {
if (mCompletionOn && mCompletions != null && index >= 0
&& index < mCompletions.length) {
CompletionInfo ci = mCompletions[index];
getCurrentInputConnection().commitCompletion(ci);
if (mCandidateView != null) {
mCandidateView.clear();
}
updateShiftKeyState(getCurrentInputEditorInfo());
} else if (mComposing.length() > 0) {
// If we were generating candidate suggestions for the current
// text, we would commit one of them here. But for this sample,
// we will just commit the current text.
commitTyped(getCurrentInputConnection());
}
}
public void swipeRight() {
if (mCompletionOn) {
pickDefaultCandidate();
}
}
public void swipeLeft() {
handleBackspace();
}
public void swipeDown() {
handleClose();
}
public void swipeUp() {
}
public void onPress(int primaryCode) {
}
public void onRelease(int primaryCode) {
}
}