Android屏幕和尺寸

DisplayMetrics dm=new DisplayMetrics();
//获取的像素高度不包含虚拟键所占空间
((WindowManager)context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay()
.getMetrics(dm);
int width=dm.widthPixels;//屏幕宽度（像素）
int height=dm.heightPixels;//屏幕高度（像素）
float density=dm.density;//dp缩放因子（0.75/1.0/1.5/3.0）
int densityDpi=dm.densityDpi;//广义密度（120/160/240/480）
float xdpi=dm.xdpi;//x轴方向的真实密度
float ydpi=dm.ydpi;//y轴方向的真实密度

- ::35.246 -/? I/UiUtils: getScreenWidthPixels: widthPixels=, heightPixels=
- ::35.246 -/? I/UiUtils: getScreenWidthPixels: density=3.0, densityDpi=
- ::35.246 -/? I/UiUtils: getScreenWidthPixels: xdpi=442.451, ydpi=443.345

getRealMetrics()和getMetrics()获取到的屏幕信息差别只在于widthPixels或heightPixels的值是否去除虚拟键所占用的像素，和是否全屏和沉浸模式无关。

来自 <http://xiaoyaozjl.iteye.com/blog/2178415> 

使用getRealMetrics()
- ::45.793 -/? I/UiUtils: getScreenWidthPixels: widthPixels=, heightPixels=
- ::45.793 -/? I/UiUtils: getScreenWidthPixels: density=3.0, densityDpi=
- ::45.794 -/? I/UiUtils: getScreenWidthPixels: xdpi=442.451, ydpi=443.345

传递点击事件的同时拦截滑动事件

/*dispatch click event but intercept sliding event in the listView*/
        recyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
            LinearLayout linearLayout;
            boolean mScrolling;
            boolean mIsTouchInListView;
            float touchDownx;
            @Override
            public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {

                int x = (int) e.getRawX();
                int y = (int) e.getRawY();
                linearLayout = (LinearLayout) rv.findViewById(R.id.menu_layout);
                mIsTouchInListView = !isTouchPointInView(linearLayout, x, y);

                switch(e.getAction()){
                    case MotionEvent.ACTION_DOWN:
                        touchDownx = e.getX();
                        mScrolling = false;
                        break;
                    case MotionEvent.ACTION_MOVE:
                        if(Math.abs(touchDownx -e.getX()) >= ViewConfiguration.get(mActivity).getScaledTouchSlop()){
                            mScrolling = true;
                        }else{
                            mScrolling = false;
                        }
                        break;
                    case MotionEvent.ACTION_UP:
                        mScrolling =false;
                        break;
                }

                Log.i(TAG, "onInterceptTouchEvent: "+mIsTouchInListView+","+mScrolling);

                return (mIsTouchInListView && mScrolling);
            }

            @Override
            public void onTouchEvent(RecyclerView rv, MotionEvent e) {
                Log.i(TAG, "onTouchEvent: ");
            }
            @Override
            public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {}
        });

全屏

  　　　　Window window = getWindow();
        WindowManager.LayoutParams params = window.getAttributes();
        params.systemUiVisibility = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
        window.setAttributes(params);

　　　　Dialog弹出时避免退出全屏
　　　　 
　　　　　AlertDialog  alertDialog = dialogBuilder.create();
        alertDialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);
        DialogViewManager.fullScreenImmersive(alertDialog.getWindow().getDecorView());
        alertDialog.show();
        alertDialog.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);

Android锁屏状态启动Activity

   Window win = getWindow();
        WindowManager.LayoutParams params = win.getAttributes();
        params = win.getAttributes();
        params.flags |= WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED;

        params.flags |= WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON;
        PowerManager pm = ((PowerManager) getSystemService(POWER_SERVICE));
        mWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, TAG);
        mWakeLock.acquire();
        Log.d(TAG, "acquire wake lock");
        win.setAttributes(params);