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.internal.policy.impl.keyguard;
18
19import android.content.Context;
20import android.content.Intent;
21import android.os.PowerManager;
22import android.os.SystemClock;
23import android.telephony.TelephonyManager;
24import android.util.AttributeSet;
25import android.view.View;
26import android.widget.Button;
27
28import com.android.internal.telephony.IccCardConstants.State;
29import com.android.internal.widget.LockPatternUtils;
30
31/**
32 * This class implements a smart emergency button that updates itself based
33 * on telephony state.  When the phone is idle, it is an emergency call button.
34 * When there's a call in progress, it presents an appropriate message and
35 * allows the user to return to the call.
36 */
37public class EmergencyButton extends Button {
38
39    private static final int EMERGENCY_CALL_TIMEOUT = 10000; // screen timeout after starting e.d.
40    private static final String ACTION_EMERGENCY_DIAL = "com.android.phone.EmergencyDialer.DIAL";
41
42    KeyguardUpdateMonitorCallback mInfoCallback = new KeyguardUpdateMonitorCallback() {
43
44        @Override
45        public void onSimStateChanged(State simState) {
46            int phoneState = KeyguardUpdateMonitor.getInstance(mContext).getPhoneState();
47            updateEmergencyCallButton(simState, phoneState);
48        }
49
50        void onPhoneStateChanged(int phoneState) {
51            State simState = KeyguardUpdateMonitor.getInstance(mContext).getSimState();
52            updateEmergencyCallButton(simState, phoneState);
53        };
54    };
55    private LockPatternUtils mLockPatternUtils;
56    private PowerManager mPowerManager;
57
58    public EmergencyButton(Context context) {
59        this(context, null);
60    }
61
62    public EmergencyButton(Context context, AttributeSet attrs) {
63        super(context, attrs);
64    }
65
66    @Override
67    protected void onAttachedToWindow() {
68        super.onAttachedToWindow();
69        KeyguardUpdateMonitor.getInstance(mContext).registerCallback(mInfoCallback);
70    }
71
72    @Override
73    protected void onDetachedFromWindow() {
74        super.onDetachedFromWindow();
75        KeyguardUpdateMonitor.getInstance(mContext).removeCallback(mInfoCallback);
76    }
77
78    @Override
79    protected void onFinishInflate() {
80        super.onFinishInflate();
81        mLockPatternUtils = new LockPatternUtils(mContext);
82        mPowerManager = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);
83        setOnClickListener(new OnClickListener() {
84            public void onClick(View v) {
85                takeEmergencyCallAction();
86            }
87        });
88        int phoneState = KeyguardUpdateMonitor.getInstance(mContext).getPhoneState();
89        State simState = KeyguardUpdateMonitor.getInstance(mContext).getSimState();
90        updateEmergencyCallButton(simState, phoneState);
91    }
92
93    /**
94     * Shows the emergency dialer or returns the user to the existing call.
95     */
96    public void takeEmergencyCallAction() {
97        // TODO: implement a shorter timeout once new PowerManager API is ready.
98        // should be the equivalent to the old userActivity(EMERGENCY_CALL_TIMEOUT)
99        mPowerManager.userActivity(SystemClock.uptimeMillis(), true);
100        if (TelephonyManager.getDefault().getCallState()
101                == TelephonyManager.CALL_STATE_OFFHOOK) {
102            mLockPatternUtils.resumeCall();
103        } else {
104            Intent intent = new Intent(ACTION_EMERGENCY_DIAL);
105            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
106                    | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
107            getContext().startActivity(intent);
108        }
109    }
110
111    private void updateEmergencyCallButton(State simState, int phoneState) {
112        boolean enabled = false;
113        if (phoneState == TelephonyManager.CALL_STATE_OFFHOOK) {
114            enabled = true; // always show "return to call" if phone is off-hook
115        } else if (mLockPatternUtils.isEmergencyCallCapable()) {
116            boolean simLocked = KeyguardUpdateMonitor.getInstance(mContext).isSimLocked();
117            if (simLocked) {
118                // Some countries can't handle emergency calls while SIM is locked.
119                enabled = mLockPatternUtils.isEmergencyCallEnabledWhileSimLocked();
120            } else {
121                // True if we need to show a secure screen (pin/pattern/SIM pin/SIM puk);
122                // hides emergency button on "Slide" screen if device is not secure.
123                enabled = mLockPatternUtils.isSecure();
124            }
125        }
126        mLockPatternUtils.updateEmergencyCallButtonState(this, phoneState, enabled,
127                KeyguardViewManager.USE_UPPER_CASE, false);
128    }
129
130}
131