获取系统的高度和宽度

/** * 获取显示屏幕的高度 * @return */private int getScreenHeight() {	WindowManager windowManager = mainActivity.getWindowManager();	Display display = windowManager.getDefaultDisplay();	Point point = new Point();	display.getSize(point);	int SCREEN_WIDTH = point.x;	int SCREEN_HEIGHT = point.y;	// 或者	DisplayMetrics dm = new DisplayMetrics();	display.getMetrics(dm);	int SCREEN_WIDTH = dm.widthPixels;	int SCREEN_HEIGHT = dm.heightPixels;	return SCREEN_HEIGHT;}/** * 获取顶部status bar高度 * @return */private int getStatusBarHeight() {	Resources resources = mContext.getResources();	int resourceId = resources.getIdentifier("status_bar_height", "dimen","android");	int height = resources.getDimensionPixelSize(resourceId);	return height;}/** * 获取底部 navigation bar 高度 * @return */private int getNavigationBarHeight() {	Resources resources = mActivity.getResources();	int resourceId = resources.getIdentifier("navigation_bar_height","dimen", "android");	int height = resources.getDimensionPixelSize(resourceId);	return height;}

获取控件的高度和宽度

1）安装布局监听器

mView.getViewTreeObserver().addOnGlobalLayoutListener(	new OnGlobalLayoutListener() {		@Override		public void onGlobalLayout(){                                             			mViewHeight = mView.getHeight();			//OnGlobalLayoutListener可能会被多次触发,所以注销掉			mView.getViewTreeObserver().removeGlobalOnLayoutListener(this);		}});

2）view的UI线程

mView.post(new Runnable() {	@Override	public void run() {		mViewHeight = mView.getMeasuredWidth());		}	});

3）重写Activity的方法

@Overridepublic void onWindowFocusChanged(boolean hasFocus) {	super.onWindowFocusChanged(hasFocus);	int[] location = new int[2];	mView.getLocationOnScreen(location);	mViewHeight = location[1];}

系统调用顺序为

Activity.oncreate()→Activity.onResume()→→TestImageView.onMeasure()→TestImageView.onLayout()→onGlobalLayoutListener()→→Activity.onWidnowFocusChanged()→.....→→TextImageView.onDraw()