Android系统移植与调试之------->如何修改Android设备添加重启、飞行模式、静音模式等功能（二）

今天要说的是为Android设备添加重启、飞行模式、静音模式按钮，客户需求中需要添加这项功能，在长按电源键弹出的菜单中没有这些选项，谨以此文记录自己添加这个功能的过程。

首先找到长按电源键弹出的对话框，在frameworks\base\policy\src\com\android\internal\policy\impl\GlobalActions.java文件中，修改createDialog（）方法。

 /**
     * Create the global actions dialog.
     * @return A new dialog.
     */
    private AlertDialog createDialog() {
        // Simple toggle style if there's no vibrator, otherwise use a tri-state
        if (!mHasVibrator) {
            mSilentModeAction = new SilentModeToggleAction();
        } else {
            mSilentModeAction = new SilentModeTriStateAction(mContext, mAudioManager, mHandler);
        }
        mAirplaneModeOn = new ToggleAction(
                R.drawable.ic_lock_airplane_mode,
                R.drawable.ic_lock_airplane_mode_off,
                R.string.global_actions_toggle_airplane_mode,
                R.string.global_actions_airplane_mode_on_status,
                R.string.global_actions_airplane_mode_off_status) {

            void onToggle(boolean on) {
                if (mHasTelephony && Boolean.parseBoolean(
                        SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE))) {
                    mIsWaitingForEcmExit = true;
                    // Launch ECM exit dialog
                    Intent ecmDialogIntent =
                            new Intent(TelephonyIntents.ACTION_SHOW_NOTICE_ECM_BLOCK_OTHERS, null);
                    ecmDialogIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                    mContext.startActivity(ecmDialogIntent);
                } else {
                    changeAirplaneModeSystemSetting(on);
                }
            }

            @Override
            protected void changeStateFromPress(boolean buttonOn) {
                if (!mHasTelephony) return;

                // In ECM mode airplane state cannot be changed
                if (!(Boolean.parseBoolean(
                        SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE)))) {
                    mState = buttonOn ? State.TurningOn : State.TurningOff;
                    mAirplaneState = mState;
                }
            }

            public boolean showDuringKeyguard() {
                return true;
            }

            public boolean showBeforeProvisioning() {
                return false;
            }
        };
        onAirplaneModeChanged();

        mItems = new ArrayList<Action>();

        // first: power off
        mItems.add(
            new SinglePressAction(
                    com.android.internal.R.drawable.ic_lock_power_off,
                    R.string.global_action_power_off) {

                public void onPress() {
                    // shutdown by making sure radio and power are handled accordingly.
                    mWindowManagerFuncs.shutdown();
                }

                public boolean onLongPress() {
                    mWindowManagerFuncs.rebootSafeMode();
                    return true;
                }

                public boolean showDuringKeyguard() {
                    return true;
                }

                public boolean showBeforeProvisioning() {
                    return true;
                }
            });

	//edited by ouyang started
	// next: reboot
        mItems.add(
            new SinglePressAction(
                    com.android.internal.R.drawable.ic_lock_power_off,
                    R.string.global_action_reboot) {

                public void onPress() {
                    	//reboot
			mWindowManagerFuncs.reboot(true);
                }

                public boolean onLongPress() {
                    mWindowManagerFuncs.rebootSafeMode();
                    return true;
                }

                public boolean showDuringKeyguard() {
                    return true;
                }

                public boolean showBeforeProvisioning() {
                    return true;
                }
            });
	//edited by ouyang ended

        // next: airplane mode
       	 mItems.add(mAirplaneModeOn);

        // last: silent mode
        if (SHOW_SILENT_TOGGLE) {
            mItems.add(mSilentModeAction);
        }

	//edited by ouyang ended
        List<UserInfo> users = mContext.getPackageManager().getUsers();
        if (users.size() > 1) {
            UserInfo currentUser;
            try {
                currentUser = ActivityManagerNative.getDefault().getCurrentUser();
            } catch (RemoteException re) {
                currentUser = null;
            }
            for (final UserInfo user : users) {
                boolean isCurrentUser = currentUser == null
                        ? user.id == 0 : (currentUser.id == user.id);
                SinglePressAction switchToUser = new SinglePressAction(
                        com.android.internal.R.drawable.ic_menu_cc,
                        (user.name != null ? user.name : "Primary")
                        + (isCurrentUser ? " \u2714" : "")) {
                    public void onPress() {
                        try {
                            ActivityManagerNative.getDefault().switchUser(user.id);
                            getWindowManager().lockNow();
                        } catch (RemoteException re) {
                            Log.e(TAG, "Couldn't switch user " + re);
                        }
                    }

                    public boolean showDuringKeyguard() {
                        return true;
                    }

                    public boolean showBeforeProvisioning() {
                        return false;
                    }
                };
                mItems.add(switchToUser);
            }
        }

        mAdapter = new MyAdapter();

        final AlertDialog.Builder ab = new AlertDialog.Builder(mContext);

        ab.setAdapter(mAdapter, this)
                .setInverseBackgroundForced(true);

        final AlertDialog dialog = ab.create();
        dialog.getListView().setItemsCanFocus(true);
        dialog.getListView().setLongClickable(true);
        dialog.getListView().setOnItemLongClickListener(
                new AdapterView.OnItemLongClickListener() {
                    @Override
                    public boolean onItemLongClick(AdapterView<?> parent, View view, int position,
                            long id) {
                        return mAdapter.getItem(position).onLongPress();
                    }
        });
        dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG);

        dialog.setOnDismissListener(this);

        return dialog;
    }

在GlobalActionsDialog方法可以看 mItems.add这个方法是添加菜单选项的，该菜单的添加的第一个选项就是关机选项。可以仿照关机的Item添加一个重启的选项，如上面的代码所示；这样就解决了在长按的电源键弹出的对话框中添加一个重启选项了。当然这仅仅是添加一个显示而已，接下来就为这个选项添加逻辑控制代码了。

在上面的代码中使用的mWindowManagerFuncs.reboot方法和R.string.global_action_reboot资源（资源的添加放到最后说），默认是不存在的，所以需要在自己手动添加。

2、首先在找到WindowManagerFuncs这个所在的位置，在frameworks\base\core\java\android\view\WindowManagerPolicy.java中

 public interface WindowManagerFuncs {
        public static final int LID_ABSENT = -1;
        public static final int LID_CLOSED = 0;
        public static final int LID_OPEN = 1;

        /**
         * Ask the window manager to re-evaluate the system UI flags.
         */
        public void reevaluateStatusBarVisibility();

        /**
         * Add a fake window to the window manager.  This window sits
         * at the top of the other windows and consumes events.
         */
        public FakeWindow addFakeWindow(Looper looper,
                InputEventReceiver.Factory inputEventReceiverFactory,
                String name, int windowType, int layoutParamsFlags, boolean canReceiveKeys,
                boolean hasFocus, boolean touchFullscreen);

        /**
         * Returns a code that describes the current state of the lid switch.
         */
        public int getLidState();

        /**
         * Creates an input channel that will receive all input from the input dispatcher.
         */
        public InputChannel monitorInput(String name);

        /**
         * Switch the keyboard layout for the given device.
         * Direction should be +1 or -1 to go to the next or previous keyboard layout.
         */
        public void switchKeyboardLayout(int deviceId, int direction);

        public void shutdown();
        public void rebootSafeMode();
	//edited by ouyang
	public void reboot(boolean confirm);
    }

添加reboot方法。但这只是添加接口而已，它的具体实现在呢？找了许久在frameworks\base\services\java\com\android\server\wm\windowManagerService.java中找到了这个接口的实现。

在该类中加入reboot()方法，该方法调用ShutdownThread的reboot方法

  // Called by window manager policy.  Not exposed externally.
    @Override
    public void shutdown() {
        ShutdownThread.shutdown(mContext, true);
    }
    //edited by ouyang start
    public void reboot(boolean confirm){
	ShutdownThread.reboot(mContext,null,confirm);
    }
    //edited by ouyang end	

同样在仿照关机的原理添加reboot的具体实现代码，既然在ShutdownThread这个类中提供了shutdown和rebootSafeMode的方法，那按理也应该有reboot的方法，或者类似reboot的方法。找到Shutdown.java文件，在frameworks\base\services\java\com\android\server\power\ShutdownThread.java中，

 /**
     * Request a clean shutdown, waiting for subsystems to clean up their
     * state etc.  Must be called from a Looper thread in which its UI
     * is shown.
     *
     * @param context Context used to display the shutdown progress dialog.
     * @param reason code to pass to the kernel (e.g. "recovery"), or null.
     * @param confirm true if user confirmation is needed before shutting down.
     */
    public static void reboot(final Context context, String reason, boolean confirm) {
        mReboot = true;
        mRebootSafeMode = false;
        mRebootReason = reason;
        shutdownInner(context, confirm);
    }

其中提供了一个静态的reboot方法，所以在windowManagerService.java中的reboot实现中直接调用ShutdownThread中reboot即可。

 public static void reboot(final Context context, String reason, boolean confirm)；有三个参数，后两个参数解释如下： reason  如果值为是null，正常重启；如果是recovery，系统重启进入recovery mode ；confirm为true显示关机提示框，需要用户【确认】；false不显示提示框，直接关机。

到此重启功能基本上可以使用了（除资源还没有添加之外），但是此时选择重启选项时，其提示还是不够关机的提示，所以还要修改选择“重启”时的对话框的提示。

在frameworks\base\services\java\com\android\server\pm\ShutdownThread.java中

修改shutdownInner方法

 static void shutdownInner(final Context context, boolean confirm) {
        // ensure that only one thread is trying to power down.
        // any additional calls are just returned
        synchronized (sIsStartedGuard) {
            if (sIsStarted) {
                Log.d(TAG, "Request to shutdown already running, returning.");
                return;
            }
        }

        final int longPressBehavior = context.getResources().getInteger(
                        com.android.internal.R.integer.config_longPressOnPowerBehavior);
	//edited by ouyang started
	final int resourceId =mReboot
	?com.android.internal.R.string.reboot_confirm
	:(mRebootSafeMode
                ? com.android.internal.R.string.reboot_safemode_confirm
                : (longPressBehavior == 2
                        ? com.android.internal.R.string.shutdown_confirm_question
                        : com.android.internal.R.string.shutdown_confirm));
	//edited by ouyang ended  

        /**
	//resource code
	final int resourceId = mRebootSafeMode
                ? com.android.internal.R.string.reboot_safemode_confirm
                : (longPressBehavior == 2
                        ? com.android.internal.R.string.shutdown_confirm_question
                        : com.android.internal.R.string.shutdown_confirm);
	*/
        Log.d(TAG, "Notifying thread to start shutdown longPressBehavior=" + longPressBehavior);

        if (confirm) {
            final CloseDialogReceiver closer = new CloseDialogReceiver(context);
            final AlertDialog dialog = new AlertDialog.Builder(context)
		    /*
		    //source code
                    .setTitle(mRebootSafeMode
                            ? com.android.internal.R.string.reboot_safemode_title
                            : com.android.internal.R.string.power_off)
                    .setMessage(resourceId)
		    */
		    //edited by ouyang started
                    .setTitle(mReboot
                        ?com.android.internal.R.string.global_action_reboot
                        :(mRebootSafeMode
                            ? com.android.internal.R.string.reboot_safemode_title
                            : com.android.internal.R.string.power_off))
                    .setMessage(resourceId)
                    //edited by ouyang ended	

                    .setPositiveButton(com.android.internal.R.string.yes, new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            beginShutdownSequence(context);
                        }
                    })
                    .setNegativeButton(com.android.internal.R.string.no, null)
                    .create();
            closer.dialog = dialog;
            dialog.setOnDismissListener(closer);
            dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
            dialog.show();
        } else {
            beginShutdownSequence(context);
        }
    }

至此关于代码部分的改动全部完成，接下就添加需要添加使用到的资源了，就是其中使用的字符串，为了简单起见就添加了英文和简体中文：

在对应的资源文件中添加：

frameworks\base\core\res\res\values\strings.xml

 <!--edited by ouyang started-->
    <string name="global_action_reboot">Reboot</string>
    <string name="reboot_confirm">Do you want to reboot your device?</string>
    <!--edited by ouyang started-->

frameworks\base\core\res\res\values-zh-rCN\strings.xml

<!--edited by ouyang started-->
    <string name="global_action_reboot">重启</string>
    <string name="reboot_confirm">您要重新启动您的设备吗？</string>
    <!--edited by ouyang started-->

现在已经添加了好这些资源，但是现在还不能使用，此时编译会出现找不到该资源的错误，还需要在frameworks\base\core\res\res\values\public.xml文件中进行资源声明：

<java-symbol type="string" name="global_action_reboot" />
<java-symbol type="string" name="reboot_confirm" />  

最后还得确认 framework/base/core/res/res/values/config.xml文件中的config_longPressOnPowerBehavior属性变成1

最后重新编译即可

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  作者：欧阳鹏  欢迎转载，与人分享是进步的源泉！

  转载请保留原文地址：http://blog.csdn.net/ouyang_peng

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