长按power键显示关机界面流程

最新推荐文章于 2023-11-21 14:15:47 发布

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最新推荐文章于 2023-11-21 14:15:47 发布

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本文链接：https://blog.youkuaiyun.com/u012966861/article/details/83029873

本文详细解析了Android系统中长按电源键触发关机菜单的内部实现机制，包括事件拦截、延迟消息处理及不同行为模式的逻辑判断。深入探讨了FreemePhoneWindowManager如何重写父类方法，自定义关机界面的显示流程。

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FreemePhoneWindowManager.java

public int interceptKeyBeforeQueueing(KeyEvent event, int policyFlags) {
      int result = super.interceptKeyBeforeQueueing(event, policyFlags); 
      ...... 
}

PhoneWindowManager.java

    public int interceptKeyBeforeQueueing(KeyEvent event, int policyFlags) {
        
        ......
        // Handle special keys.
        switch (keyCode) {
          ......

            case KeyEvent.KEYCODE_POWER: {
                // Any activity on the power button stops the accessibility shortcut
                cancelPendingAccessibilityShortcutAction();
                result &= ~ACTION_PASS_TO_USER;
                isWakeKey = false; // wake-up will be handled separately
                if (down) {
                    interceptPowerKeyDown(event, interactive);//如果按下会执行该方法
                } else {
                    interceptPowerKeyUp(event, interactive, canceled);
                }
                break;
            }

            ......
    }

    private void interceptPowerKeyDown(KeyEvent event, boolean interactive) {
            ......

        // If the power key has still not yet been handled, then detect short
        // press, long press, or multi press and decide what to do.
        mPowerKeyHandled = hungUp || mScreenshotChordVolumeDownKeyTriggered
                || mA11yShortcutChordVolumeUpKeyTriggered || gesturedServiceIntercepted;
        if (!mPowerKeyHandled) {
            if (interactive) {
                // When interactive, we're already awake.
                // Wait for a long press or for the button to be released to decide what to do.
                if (hasLongPressOnPowerBehavior()) {
                    Message msg = mHandler.obtainMessage(MSG_POWER_LONG_PRESS);
                    msg.setAsynchronous(true);
                    mHandler.sendMessageDelayed(msg,
                            ViewConfiguration.get(mContext).getDeviceGlobalActionKeyTimeout());
                }//到Handler中去执行显示界面和关机的操作
            } else {
                wakeUpFromPowerKey(event.getDownTime());

                if (mSupportLongPressPowerWhenNonInteractive && hasLongPressOnPowerBehavior()) {
                    Message msg = mHandler.obtainMessage(MSG_POWER_LONG_PRESS);
                    msg.setAsynchronous(true);
                    mHandler.sendMessageDelayed(msg,
                            ViewConfiguration.get(mContext).getDeviceGlobalActionKeyTimeout());
                    mBeganFromNonInteractive = true;
                } else {
                    final int maxCount = getMaxMultiPressPowerCount();

                    if (maxCount <= 1) {
                        mPowerKeyHandled = true;
                    } else {
                        mBeganFromNonInteractive = true;
                    }
                }
            }
        }

mHandler = new PolicyHandler();

    private class PolicyHandler extends Handler {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                ......
                case MSG_POWER_LONG_PRESS:
                    powerLongPress();
                    break;
                ......
     
            }
        }
    }

    private void powerLongPress() {
        final int behavior = getResolvedLongPressOnPowerBehavior();
        switch (behavior) {
        case LONG_PRESS_POWER_NOTHING:
            break;
        case LONG_PRESS_POWER_GLOBAL_ACTIONS:
            mPowerKeyHandled = true;
            performHapticFeedbackLw(null, HapticFeedbackConstants.LONG_PRESS, false);
            showGlobalActionsInternal();//此处为显示关机界面的方法
            break;
        case LONG_PRESS_POWER_SHUT_OFF:
        case LONG_PRESS_POWER_SHUT_OFF_NO_CONFIRM:
            mPowerKeyHandled = true;
            performHapticFeedbackLw(null, HapticFeedbackConstants.LONG_PRESS, false);
            sendCloseSystemWindows(SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS);
            mWindowManagerFuncs.shutdown(behavior == LONG_PRESS_POWER_SHUT_OFF);
            break;
        }
    }

FreemePhoneWindowManager.java重写了该方法

    @Override
    protected void showGlobalActionsInternal() {
        sendCloseSystemWindows(SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS);
        com.freeme.server.policy.globalaction.FreemeGlobalActions
                .getInstance(mContext, mWindowManagerFuncs)
                .showDialog(isKeyguardShowingAndNotOccluded(), isDeviceProvisioned());
    }

FreemeGlobalActions.java

    public void showDialog(boolean keyguardShowing, boolean isDeviceProvisioned) {
        if (mFreemeGlobalActionsShowing) {
            return;
        }
        mKeyguardShowing = keyguardShowing;
        mIsDeviceProvisioned = isDeviceProvisioned;
        mHandler.sendEmptyMessage(MESSAGE_SHOW);
    }

    private Handler mHandler = new Handler(Looper.getMainLooper()) {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                ......
                case MESSAGE_SHOW: {
                    handleShow();
                } break;
     }

FreemeGlobalActions.java

    private void createGlobalActionsView() {
        if (mGlobalActionsView != null) {
            mWM.removeView(mGlobalActionsView);
            mGlobalActionsView = null;
        }

        int themeID = mContext.getResources().getIdentifier("Theme.Freeme.Panel", "style", "freeme");
        ContextThemeWrapper themeContext = new ContextThemeWrapper(mContext, themeID);
        LayoutInflater inflater = LayoutInflater.from(themeContext);

        int flags = WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED
                | WindowManager.LayoutParams.FLAG_FULLSCREEN
                | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN
                | WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON
                | WindowManager.LayoutParams.FLAG_BLUR_BEHIND;
        int stretch = -1;

        WindowManager.LayoutParams
                lp = new WindowManager.LayoutParams(stretch, stretch, WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG, flags, stretch);
        /*/
        lp.privateFlags |= WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS
        //*/
        lp.privateFlags |= WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS | WindowManager.LayoutParams.PRIVATE_FLAG_COLLAPSE_NAVI_BAR;
        //*/
        lp.screenOrientation = ActivityInfo.SCREEN_ORIENTATION_NOSENSOR;
        //*/ FIXME: 17-7-13  replace anim later
        lp.windowAnimations = android.R.style.Animation_Toast;
        //*/
        mGlobalActionsView = (FreemeGlobalActionsView) inflater.inflate(R.layout.globalaction_root_view_freeme, null);//mGlobalActionsView即为要显示的关机diglog,globalaction_root_view_freeme为xml视图
        mGlobalActionsView.setContentDescription(mContext.getResources().getString(R.string.globalaction_poweroff_widget_name));
        mGlobalActionsView.initUI(mHandler.getLooper());
        mGlobalActionsView.registerActionPressedCallback(this);
        mGlobalActionsView.setVisibility(View.INVISIBLE);
        mGlobalActionsView.requestFocus();
        mWM.addView(mGlobalActionsView, lp);
        mGlobalActionsView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION // hide nav bar
                | View.SYSTEM_UI_FLAG_FULLSCREEN // hide status bar
                | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
    }