深入浅出Google Android源码

/* * Copyright (C) 2008-2009 Google Inc. * * 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.android.inputmethod.latin; import android.app.AlertDialog; import android.content.BroadcastReceiver; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.IntentFilter; import android.content.SharedPreferences; import android.content.res.Configuration; import android.inputmethodservice.InputMethodService; import android.inputmethodservice.Keyboard; import android.inputmethodservice.KeyboardView; import android.media.AudioManager; import android.os.Debug; import android.os.Handler; import android.os.Message; import android.os.SystemClock; import android.os.Vibrator; import android.preference.PreferenceManager; import android.text.AutoText; import android.text.ClipboardManager; import android.text.TextUtils; import android.util.Log; import android.util.PrintWriterPrinter; import android.util.Printer; import android.view.KeyEvent; import android.view.View; import android.view.Window; import android.view.WindowManager; import android.view.inputmethod.CompletionInfo; import android.view.inputmethod.EditorInfo; import android.view.inputmethod.InputConnection; import android.view.inputmethod.InputMethodManager; import java.io.FileDescriptor; import java.io.PrintWriter; import java.util.ArrayList; import java.util.List; /** * Input method implementation for Qwerty'ish keyboard. */ public class LatinIME extends InputMethodService implements KeyboardView.OnKeyboardActionListener { static final boolean DEBUG = false; static final boolean TRACE = false; private static final String PREF_VIBRATE_ON = "vibrate_on"; private static final String PREF_SOUND_ON = "sound_on"; private static final String PREF_AUTO_CAP = "auto_cap"; private static final String PREF_QUICK_FIXES = "quick_fixes"; private static final String PREF_SHOW_SUGGESTIONS = "show_suggestions"; private static final String PREF_AUTO_COMPLETE = "auto_complete"; private static final int MSG_UPDATE_SUGGESTIONS = 0; private static final int MSG_START_TUTORIAL = 1; // How many continuous deletes at which to start deleting at a higher speed. private static final int DELETE_ACCELERATE_AT = 20; // Key events coming any faster than this are long-presses. private static final int QUICK_PRESS = 200; private static final int KEYCODE_ENTER = 10; private static final int KEYCODE_SPACE = ' '; // Contextual menu positions private static final int POS_SETTINGS = 0; private static final int POS_METHOD = 1; private LatinKeyboardView mInputView; private CandidateViewContainer mCandidateViewContainer; private CandidateView mCandidateView; private Suggest mSuggest; private CompletionInfo[] mCompletions; private AlertDialog mOptionsDialog; KeyboardSwitcher mKeyboardSwitcher; private UserDictionary mUserDictionary; private String mLocale; private StringBuilder mComposing = new StringBuilder(); private WordComposer mWord = new WordComposer(); private int mCommittedLength; private boolean mPredicting; private CharSequence mBestWord; private boolean mPredictionOn; private boolean mCompletionOn; private boolean mAutoSpace; private boolean mAutoCorrectOn; private boolean mCapsLock; private boolean mVibrateOn; private boolean mSoundOn; private boolean mAutoCap; private boolean mQuickFixes; private boolean mShowSuggestions; private boolean mAutoComplete; private int mCorrectionMode; // Indicates whether the suggestion strip is to be on in landscape private boolean mJustAccepted; private CharSequence mJustRevertedSeparator; private int mDeleteCount; private long mLastKeyTime; private Tutorial mTutorial; private Vibrator mVibrator; private long mVibrateDuration; private AudioManager mAudioManager; private final float FX_VOLUME = 1.0f; private boolean mSilentMode; private String mWordSeparators; private String mSentenceSeparators; Handler mHandler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case MSG_UPDATE_SUGGESTIONS: updateSuggestions(); break; case MSG_START_TUTORIAL: if (mTutorial == null) { if (mInputView.isShown()) { mTutorial = new Tutorial(LatinIME.this, mInputView); mTutorial.start(); } else { // Try again soon if the view is not yet showing sendMessageDelayed(obtainMessage(MSG_START_TUTORIAL), 100); } } break; } } }; @Override public void onCreate() { super.onCreate(); //setStatusIcon(R.drawable.ime_qwerty); mKeyboardSwitcher = new KeyboardSwitcher(this); initSuggest(getResources().getConfiguration().locale.toString()); mVibrateDuration = getResources().getInteger(R.integer.vibrate_duration_ms); // register to receive ringer mode changes for silent mode IntentFilter filter = new IntentFilter(AudioManager.RINGER_MODE_CHANGED_ACTION); registerReceiver(mReceiver, filter); } private void initSuggest(String locale) { mLocale = locale; mSuggest = new Suggest(this, R.raw.main); mSuggest.setCorrectionMode(mCorrectionMode); mUserDictionary = new UserDictionary(this); mSuggest.setUserDictionary(mUserDictionary); mWordSeparators = getResources().getString(R.string.word_separators); mSentenceSeparators = getResources().getString(R.string.sentence_separators); } @Override public void onDestroy() { mUserDictionary.close(); unregisterReceiver(mReceiver); super.onDestroy(); } @Override public void onConfigurationChanged(Configuration conf) { if (!TextUtils.equals(conf.locale.toString(), mLocale)) { initSuggest(conf.locale.toString()); } super.onConfigurationChanged(conf); } @Override public View onCreateInputView() { mInputView = (LatinKeyboardView) getLayoutInflater().inflate( R.layout.input, null); mKeyboardSwitcher.setInputView(mInputView); mKeyboardSwitcher.makeKeyboards(); mInputView.setOnKeyboardActionListener(this); mKeyboardSwitcher.setKeyboardMode(KeyboardSwitcher.MODE_TEXT, 0); return mInputView; } @Override public View onCreateCandidatesView() { mKeyboardSwitcher.makeKeyboards(); mCandidateViewContainer = (CandidateViewContainer) getLayoutInflater().inflate( R.layout.candidates, null); mCandidateViewContainer.initViews(); mCandidateView = (CandidateView) mCandidateViewContainer.findViewById(R.id.candidates); mCandidateView.setService(this); setCandidatesViewShown(true); return mCandidateViewContainer; } @Override public void onStartInputView(EditorInfo attribute, boolean restarting) { // In landscape mode, this method gets ca