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

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 onmousehoverattop() {
            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 onmousehoveratbottom() {
            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 onmouseleavefromedge() {
            mhandler.removemessages(msg_request_transient_bars);
          }
        });

代码中监听了手势操作，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();
  }

总结

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