1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.keyguard;
18
19import android.app.admin.DevicePolicyManager;
20import android.content.Context;
21import android.content.res.Configuration;
22import android.text.Editable;
23import android.text.InputType;
24import android.text.TextWatcher;
25import android.text.method.DigitsKeyListener;
26import android.text.method.TextKeyListener;
27import android.util.AttributeSet;
28import android.view.View;
29import android.view.inputmethod.InputMethodInfo;
30import android.view.inputmethod.InputMethodManager;
31import android.view.inputmethod.InputMethodSubtype;
32import android.widget.TextView.OnEditorActionListener;
33
34import com.android.internal.widget.PasswordEntryKeyboardHelper;
35import com.android.internal.widget.PasswordEntryKeyboardView;
36
37import java.util.List;
38/**
39 * Displays an alphanumeric (latin-1) key entry for the user to enter
40 * an unlock password
41 */
42
43public class KeyguardPasswordView extends KeyguardAbsKeyInputView
44        implements KeyguardSecurityView, OnEditorActionListener, TextWatcher {
45
46    private final boolean mShowImeAtScreenOn;
47
48    InputMethodManager mImm;
49
50    public KeyguardPasswordView(Context context) {
51        this(context, null);
52    }
53
54    public KeyguardPasswordView(Context context, AttributeSet attrs) {
55        super(context, attrs);
56        mShowImeAtScreenOn = context.getResources().
57                getBoolean(R.bool.kg_show_ime_at_screen_on);
58    }
59
60    protected void resetState() {
61        mSecurityMessageDisplay.setMessage(R.string.kg_password_instructions, false);
62        mPasswordEntry.setEnabled(true);
63    }
64
65    @Override
66    protected int getPasswordTextViewId() {
67        return R.id.passwordEntry;
68    }
69
70    @Override
71    public boolean needsInput() {
72        return true;
73    }
74
75    @Override
76    public void onResume(int reason) {
77        super.onResume(reason);
78        mPasswordEntry.requestFocus();
79        if (reason != KeyguardSecurityView.SCREEN_ON || mShowImeAtScreenOn) {
80            mImm.showSoftInput(mPasswordEntry, InputMethodManager.SHOW_IMPLICIT);
81        }
82    }
83
84    @Override
85    public void onPause() {
86        super.onPause();
87        mImm.hideSoftInputFromWindow(getWindowToken(), 0);
88    }
89
90    @Override
91    protected void onFinishInflate() {
92        super.onFinishInflate();
93
94        boolean imeOrDeleteButtonVisible = false;
95
96        mImm = (InputMethodManager) getContext().getSystemService(
97                Context.INPUT_METHOD_SERVICE);
98
99        mPasswordEntry.setKeyListener(TextKeyListener.getInstance());
100        mPasswordEntry.setInputType(InputType.TYPE_CLASS_TEXT
101                | InputType.TYPE_TEXT_VARIATION_PASSWORD);
102
103        // Poke the wakelock any time the text is selected or modified
104        mPasswordEntry.setOnClickListener(new OnClickListener() {
105            public void onClick(View v) {
106                mCallback.userActivity(0); // TODO: customize timeout for text?
107            }
108        });
109
110        mPasswordEntry.addTextChangedListener(new TextWatcher() {
111            public void onTextChanged(CharSequence s, int start, int before, int count) {
112            }
113
114            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
115            }
116
117            public void afterTextChanged(Editable s) {
118                if (mCallback != null) {
119                    mCallback.userActivity(0);
120                }
121            }
122        });
123
124        mPasswordEntry.requestFocus();
125
126        // If there's more than one IME, enable the IME switcher button
127        View switchImeButton = findViewById(R.id.switch_ime_button);
128        if (switchImeButton != null && hasMultipleEnabledIMEsOrSubtypes(mImm, false)) {
129            switchImeButton.setVisibility(View.VISIBLE);
130            imeOrDeleteButtonVisible = true;
131            switchImeButton.setOnClickListener(new OnClickListener() {
132                public void onClick(View v) {
133                    mCallback.userActivity(0); // Leave the screen on a bit longer
134                    mImm.showInputMethodPicker();
135                }
136            });
137        }
138
139        // If no icon is visible, reset the start margin on the password field so the text is
140        // still centered.
141        if (!imeOrDeleteButtonVisible) {
142            android.view.ViewGroup.LayoutParams params = mPasswordEntry.getLayoutParams();
143            if (params instanceof MarginLayoutParams) {
144                final MarginLayoutParams mlp = (MarginLayoutParams) params;
145                mlp.setMarginStart(0);
146                mPasswordEntry.setLayoutParams(params);
147            }
148        }
149    }
150
151    /**
152     * Method adapted from com.android.inputmethod.latin.Utils
153     *
154     * @param imm The input method manager
155     * @param shouldIncludeAuxiliarySubtypes
156     * @return true if we have multiple IMEs to choose from
157     */
158    private boolean hasMultipleEnabledIMEsOrSubtypes(InputMethodManager imm,
159            final boolean shouldIncludeAuxiliarySubtypes) {
160        final List<InputMethodInfo> enabledImis = imm.getEnabledInputMethodList();
161
162        // Number of the filtered IMEs
163        int filteredImisCount = 0;
164
165        for (InputMethodInfo imi : enabledImis) {
166            // We can return true immediately after we find two or more filtered IMEs.
167            if (filteredImisCount > 1) return true;
168            final List<InputMethodSubtype> subtypes =
169                    imm.getEnabledInputMethodSubtypeList(imi, true);
170            // IMEs that have no subtypes should be counted.
171            if (subtypes.isEmpty()) {
172                ++filteredImisCount;
173                continue;
174            }
175
176            int auxCount = 0;
177            for (InputMethodSubtype subtype : subtypes) {
178                if (subtype.isAuxiliary()) {
179                    ++auxCount;
180                }
181            }
182            final int nonAuxCount = subtypes.size() - auxCount;
183
184            // IMEs that have one or more non-auxiliary subtypes should be counted.
185            // If shouldIncludeAuxiliarySubtypes is true, IMEs that have two or more auxiliary
186            // subtypes should be counted as well.
187            if (nonAuxCount > 0 || (shouldIncludeAuxiliarySubtypes && auxCount > 1)) {
188                ++filteredImisCount;
189                continue;
190            }
191        }
192
193        return filteredImisCount > 1
194        // imm.getEnabledInputMethodSubtypeList(null, false) will return the current IME's enabled
195        // input method subtype (The current IME should be LatinIME.)
196                || imm.getEnabledInputMethodSubtypeList(null, false).size() > 1;
197    }
198
199    @Override
200    public void showUsabilityHint() {
201    }
202
203    @Override
204    public int getWrongPasswordStringId() {
205        return R.string.kg_wrong_password;
206    }
207}
208