EmergencyButton.java revision 8150d2a2a12b38598fd55d8ae3c3b5662ec3520f 
1/*
2 * Copyright (C) 2008 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.content.Context;
20import android.content.Intent;
21import android.os.PowerManager;
22import android.os.SystemClock;
23import android.os.UserHandle;
24import android.telecom.TelecomManager;
25import android.util.AttributeSet;
26import android.view.View;
27import android.widget.Button;
28
29import com.android.internal.telephony.IccCardConstants.State;
30import com.android.internal.widget.LockPatternUtils;
31
32/**
33 * This class implements a smart emergency button that updates itself based
34 * on telephony state.  When the phone is idle, it is an emergency call button.
35 * When there's a call in progress, it presents an appropriate message and
36 * allows the user to return to the call.
37 */
38public class EmergencyButton extends Button {
39    private static final Intent INTENT_EMERGENCY_DIAL = new Intent()
40            .setAction("com.android.phone.EmergencyDialer.DIAL")
41            .setPackage("com.android.phone")
42            .setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
43                    | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS
44                    | Intent.FLAG_ACTIVITY_CLEAR_TASK);
45
46    KeyguardUpdateMonitorCallback mInfoCallback = new KeyguardUpdateMonitorCallback() {
47
48        @Override
49        public void onSimStateChanged(int subId, int slotId, State simState) {
50            updateEmergencyCallButton();
51        }
52
53        @Override
54        public void onPhoneStateChanged(int phoneState) {
55            updateEmergencyCallButton();
56        }
57    };
58
59    public interface EmergencyButtonCallback {
60        public void onEmergencyButtonClickedWhenInCall();
61    }
62
63    private LockPatternUtils mLockPatternUtils;
64    private PowerManager mPowerManager;
65    private EmergencyButtonCallback mEmergencyButtonCallback;
66
67    private final boolean mIsVoiceCapable;
68    private final boolean mEnableEmergencyCallWhileSimLocked;
69
70    public EmergencyButton(Context context) {
71        this(context, null);
72    }
73
74    public EmergencyButton(Context context, AttributeSet attrs) {
75        super(context, attrs);
76        mIsVoiceCapable = context.getResources().getBoolean(
77                com.android.internal.R.bool.config_voice_capable);
78        mEnableEmergencyCallWhileSimLocked = mContext.getResources().getBoolean(
79                com.android.internal.R.bool.config_enable_emergency_call_while_sim_locked);
80    }
81
82    @Override
83    protected void onAttachedToWindow() {
84        super.onAttachedToWindow();
85        KeyguardUpdateMonitor.getInstance(mContext).registerCallback(mInfoCallback);
86    }
87
88    @Override
89    protected void onDetachedFromWindow() {
90        super.onDetachedFromWindow();
91        KeyguardUpdateMonitor.getInstance(mContext).removeCallback(mInfoCallback);
92    }
93
94    @Override
95    protected void onFinishInflate() {
96        super.onFinishInflate();
97        mLockPatternUtils = new LockPatternUtils(mContext);
98        mPowerManager = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);
99        setOnClickListener(new OnClickListener() {
100            public void onClick(View v) {
101                takeEmergencyCallAction();
102            }
103        });
104        updateEmergencyCallButton();
105    }
106
107    /**
108     * Shows the emergency dialer or returns the user to the existing call.
109     */
110    public void takeEmergencyCallAction() {
111        // TODO: implement a shorter timeout once new PowerManager API is ready.
112        // should be the equivalent to the old userActivity(EMERGENCY_CALL_TIMEOUT)
113        mPowerManager.userActivity(SystemClock.uptimeMillis(), true);
114        if (isInCall()) {
115            resumeCall();
116            if (mEmergencyButtonCallback != null) {
117                mEmergencyButtonCallback.onEmergencyButtonClickedWhenInCall();
118            }
119        } else {
120            KeyguardUpdateMonitor.getInstance(mContext).reportEmergencyCallAction(
121                    true /* bypassHandler */);
122            getContext().startActivityAsUser(INTENT_EMERGENCY_DIAL,
123                    new UserHandle(mLockPatternUtils.getCurrentUser()));
124        }
125    }
126
127    private void updateEmergencyCallButton() {
128        boolean visible = false;
129        if (mIsVoiceCapable) {
130            // Emergency calling requires voice capability.
131            if (isInCall()) {
132                visible = true; // always show "return to call" if phone is off-hook
133            } else {
134                final boolean simLocked = KeyguardUpdateMonitor.getInstance(mContext)
135                        .isSimPinVoiceSecure();
136                if (simLocked) {
137                    // Some countries can't handle emergency calls while SIM is locked.
138                    visible = mEnableEmergencyCallWhileSimLocked;
139                } else {
140                    // Only show if there is a secure screen (pin/pattern/SIM pin/SIM puk);
141                    visible = mLockPatternUtils.isSecure(mLockPatternUtils.getCurrentUser());
142                }
143            }
144        }
145        if (visible) {
146            setVisibility(View.VISIBLE);
147
148            int textId;
149            if (isInCall()) {
150                textId = com.android.internal.R.string.lockscreen_return_to_call;
151            } else {
152                textId = com.android.internal.R.string.lockscreen_emergency_call;
153            }
154            setText(textId);
155        } else {
156            setVisibility(View.GONE);
157        }
158    }
159
160    public void setCallback(EmergencyButtonCallback callback) {
161        mEmergencyButtonCallback = callback;
162    }
163
164    /**
165     * Resumes a call in progress.
166     */
167    private void resumeCall() {
168        getTelecommManager().showInCallScreen(false);
169    }
170
171    /**
172     * @return {@code true} if there is a call currently in progress.
173     */
174    private boolean isInCall() {
175        return getTelecommManager().isInCall();
176    }
177
178    private TelecomManager getTelecommManager() {
179        return (TelecomManager) mContext.getSystemService(Context.TELECOM_SERVICE);
180    }
181}
182