Android PhoneWindowManager监听屏幕右侧向左滑动实现返回功能

概述    由于项目没有设计返回键，一旦进入别的应用，就无法回到桌面。只能通过串口输入inputkeyevent4（返回键）来返回桌面，为了方便调试，在Framework中监听手势，实现返回功能。    在frameworks\base\services\core\java\com\android\server\policy\PhoneWindowManager

        由于项目没有设计返回键，一旦进入别的应用，就无法回到桌面。只能通过串口输入input keyevent 4（返回键）来返回桌面，为了方便调试，在Framework 中监听手势，实现返回功能。

       在frameworks\base\services\core\java\com\androID\server\policy\PhoneWindowManager中有这么一段代码

mSystemGestures = new SystemGesturesPointerEventListener(context,                new SystemGesturesPointerEventListener.Callbacks() {                    @OverrIDe                    public voID onSwipeFromtop() {						Log.i("gyx","onSwipeFromtop");                        if (mStatusbar != null) {                            requestTransIEntbars(mStatusbar);                        }                    }                    @OverrIDe                    public voID onSwipeFromBottom() {						Log.i("gyx","onSwipeFromBottom");                        if (mNavigationbar != null && mNavigationbarposition == NAV_bar_BottOM) {                            requestTransIEntbars(mNavigationbar);                        }                    }                    @OverrIDe                    public voID onSwipeFromright() {						Log.i("gyx","onSwipeFromright");						sendKeyCode(4);						Log.i("gyx","sendKeyCode 4");                        if (mNavigationbar != null && mNavigationbarposition == NAV_bar_RIGHT) {                            requestTransIEntbars(mNavigationbar);                        }                    }                    @OverrIDe                    public voID onSwipeFromleft() {						Log.i("gyx","onSwipeFromleft");                        if (mNavigationbar != null && mNavigationbarposition == NAV_bar_left) {                            requestTransIEntbars(mNavigationbar);                        }                    }                    @OverrIDe                    public voID onFling(int duration) {                        if (mPowerManagerInternal != null) {                            mPowerManagerInternal.powerHint(                                    PowerHint.INteraCTION, duration);                        }                    }                    @OverrIDe                    public voID onDeBUG() {                        // no-op                    }                    @OverrIDe                    public voID onDown() {                        mOrIEntationListener.ontouchstart();                    }                    @OverrIDe                    public voID onUpOrCancel() {                        mOrIEntationListener.ontouchend();                    }                    @OverrIDe                    public voID onm ouseHoverAttop() {                        mHandler.removeMessages(MSG_REQUEST_TRANSIENT_barS);                        Message msg = mHandler.obtainMessage(MSG_REQUEST_TRANSIENT_barS);                        msg.arg1 = MSG_REQUEST_TRANSIENT_barS_ARG_STATUS;                        mHandler.sendMessageDelayed(msg, 500);                    }                    @OverrIDe                    public voID onm ouseHoverAtBottom() {                        mHandler.removeMessages(MSG_REQUEST_TRANSIENT_barS);                        Message msg = mHandler.obtainMessage(MSG_REQUEST_TRANSIENT_barS);                        msg.arg1 = MSG_REQUEST_TRANSIENT_barS_ARG_NAVIGATION;                        mHandler.sendMessageDelayed(msg, 500);                    }                    @OverrIDe                    public voID onm ouseLeaveFromEdge() {                        mHandler.removeMessages(MSG_REQUEST_TRANSIENT_barS);                    }                });

代码中监听了手势 *** 作，其中onSwipeFromright()就是当从屏幕的右侧向左滑动时会触发，只要在这里加入返回的功能即可；
实现返回按键的功能代码如下

private voID sendKeyCode(final int keyCode) {        new Thread(new Runnable() {            @OverrIDe            public voID run() {                try {                    // 创建一个Instrumentation对象                    Instrumentation inst = new Instrumentation();                    // 调用inst对象的按键模拟方法                    inst.sendKeyDownUpSync(keyCode);                } catch (Exception e) {                    e.printstacktrace();                }            }        }).start();    }

 

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