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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.app.ActivityManagerNative;
20import android.app.ActivityOptions;
21import android.content.Context;
22import android.content.Intent;
23import android.content.res.Configuration;
24import android.os.PowerManager;
25import android.os.RemoteException;
26import android.os.SystemClock;
27import android.os.UserHandle;
28import android.telecom.TelecomManager;
29import android.util.AttributeSet;
30import android.util.Slog;
31import android.view.View;
32import android.widget.Button;
33
34import com.android.internal.logging.MetricsLogger;
35import com.android.internal.logging.MetricsProto.MetricsEvent;
36import com.android.internal.telephony.IccCardConstants.State;
37import com.android.internal.widget.LockPatternUtils;
38
39/**
40 * This class implements a smart emergency button that updates itself based
41 * on telephony state.  When the phone is idle, it is an emergency call button.
42 * When there's a call in progress, it presents an appropriate message and
43 * allows the user to return to the call.
44 */
45public class EmergencyButton extends Button {
46    private static final Intent INTENT_EMERGENCY_DIAL = new Intent()
47            .setAction("com.android.phone.EmergencyDialer.DIAL")
48            .setPackage("com.android.phone")
49            .setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
50                    | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS
51                    | Intent.FLAG_ACTIVITY_CLEAR_TOP);
52
53    private static final String LOG_TAG = "EmergencyButton";
54
55    KeyguardUpdateMonitorCallback mInfoCallback = new KeyguardUpdateMonitorCallback() {
56
57        @Override
58        public void onSimStateChanged(int subId, int slotId, State simState) {
59            updateEmergencyCallButton();
60        }
61
62        @Override
63        public void onPhoneStateChanged(int phoneState) {
64            updateEmergencyCallButton();
65        }
66    };
67
68    public interface EmergencyButtonCallback {
69        public void onEmergencyButtonClickedWhenInCall();
70    }
71
72    private LockPatternUtils mLockPatternUtils;
73    private PowerManager mPowerManager;
74    private EmergencyButtonCallback mEmergencyButtonCallback;
75
76    private final boolean mIsVoiceCapable;
77    private final boolean mEnableEmergencyCallWhileSimLocked;
78
79    public EmergencyButton(Context context) {
80        this(context, null);
81    }
82
83    public EmergencyButton(Context context, AttributeSet attrs) {
84        super(context, attrs);
85        mIsVoiceCapable = context.getResources().getBoolean(
86                com.android.internal.R.bool.config_voice_capable);
87        mEnableEmergencyCallWhileSimLocked = mContext.getResources().getBoolean(
88                com.android.internal.R.bool.config_enable_emergency_call_while_sim_locked);
89    }
90
91    @Override
92    protected void onAttachedToWindow() {
93        super.onAttachedToWindow();
94        KeyguardUpdateMonitor.getInstance(mContext).registerCallback(mInfoCallback);
95    }
96
97    @Override
98    protected void onDetachedFromWindow() {
99        super.onDetachedFromWindow();
100        KeyguardUpdateMonitor.getInstance(mContext).removeCallback(mInfoCallback);
101    }
102
103    @Override
104    protected void onFinishInflate() {
105        super.onFinishInflate();
106        mLockPatternUtils = new LockPatternUtils(mContext);
107        mPowerManager = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);
108        setOnClickListener(new OnClickListener() {
109            public void onClick(View v) {
110                takeEmergencyCallAction();
111            }
112        });
113        updateEmergencyCallButton();
114    }
115
116    @Override
117    protected void onConfigurationChanged(Configuration newConfig) {
118        super.onConfigurationChanged(newConfig);
119        updateEmergencyCallButton();
120    }
121
122    /**
123     * Shows the emergency dialer or returns the user to the existing call.
124     */
125    public void takeEmergencyCallAction() {
126        MetricsLogger.action(mContext, MetricsEvent.ACTION_EMERGENCY_CALL);
127        // TODO: implement a shorter timeout once new PowerManager API is ready.
128        // should be the equivalent to the old userActivity(EMERGENCY_CALL_TIMEOUT)
129        mPowerManager.userActivity(SystemClock.uptimeMillis(), true);
130        try {
131            ActivityManagerNative.getDefault().stopSystemLockTaskMode();
132        } catch (RemoteException e) {
133            Slog.w(LOG_TAG, "Failed to stop app pinning");
134        }
135        if (isInCall()) {
136            resumeCall();
137            if (mEmergencyButtonCallback != null) {
138                mEmergencyButtonCallback.onEmergencyButtonClickedWhenInCall();
139            }
140        } else {
141            KeyguardUpdateMonitor.getInstance(mContext).reportEmergencyCallAction(
142                    true /* bypassHandler */);
143            getContext().startActivityAsUser(INTENT_EMERGENCY_DIAL,
144                    ActivityOptions.makeCustomAnimation(getContext(), 0, 0).toBundle(),
145                    new UserHandle(KeyguardUpdateMonitor.getCurrentUser()));
146        }
147    }
148
149    private void updateEmergencyCallButton() {
150        boolean visible = false;
151        if (mIsVoiceCapable) {
152            // Emergency calling requires voice capability.
153            if (isInCall()) {
154                visible = true; // always show "return to call" if phone is off-hook
155            } else {
156                final boolean simLocked = KeyguardUpdateMonitor.getInstance(mContext)
157                        .isSimPinVoiceSecure();
158                if (simLocked) {
159                    // Some countries can't handle emergency calls while SIM is locked.
160                    visible = mEnableEmergencyCallWhileSimLocked;
161                } else {
162                    // Only show if there is a secure screen (pin/pattern/SIM pin/SIM puk);
163                    visible = mLockPatternUtils.isSecure(KeyguardUpdateMonitor.getCurrentUser());
164                }
165            }
166        }
167        if (visible) {
168            setVisibility(View.VISIBLE);
169
170            int textId;
171            if (isInCall()) {
172                textId = com.android.internal.R.string.lockscreen_return_to_call;
173            } else {
174                textId = com.android.internal.R.string.lockscreen_emergency_call;
175            }
176            setText(textId);
177        } else {
178            setVisibility(View.GONE);
179        }
180    }
181
182    public void setCallback(EmergencyButtonCallback callback) {
183        mEmergencyButtonCallback = callback;
184    }
185
186    /**
187     * Resumes a call in progress.
188     */
189    private void resumeCall() {
190        getTelecommManager().showInCallScreen(false);
191    }
192
193    /**
194     * @return {@code true} if there is a call currently in progress.
195     */
196    private boolean isInCall() {
197        return getTelecommManager().isInCall();
198    }
199
200    private TelecomManager getTelecommManager() {
201        return (TelecomManager) mContext.getSystemService(Context.TELECOM_SERVICE);
202    }
203}
204