Android获取屏幕宽高、屏幕密度、手动计算view大小

1、ldpi、mdpi、hdpi、xhdpi、xxhdpi

2、计算屏幕密度

3、Android APP图标大小

4、获取状态栏高度

private int getStatusBarHeight() {  int result = 0;  int resourceId = getResources().getIdentifier(    "status_bar_height", "dimen", "android");  if (resourceId > 0) {   result = getResources().getDimensionPixelSize(resourceId);  }  return result; }

5、获取屏幕长宽常用方法
方法一：

WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);int width = wm.getDefaultDisplay().getWidth();int height = wm.getDefaultDisplay().getHeight();

方法二：

WindowManager wm1 = this.getWindowManager();int width = wm1.getDefaultDisplay().getWidth();int height = wm1.getDefaultDisplay().getHeight();

方法三：

DisplayMetrics dm = new DisplayMetrics();getWindowManager().getDefaultDisplay().getMetrics(dm);int mScreenWidth = dm.widthPixels;int mScreenHeight = dm.heightPixels;

6、手动计算View高度，动态布局

private void adjustViewPagerLayoutParams() {        final int w = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);        final int h = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);        ViewTreeObserver vto = chartPager.getViewTreeObserver();        vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {            @Override            public void onGlobalLayout() {                chartPager.getViewTreeObserver().removeGlobalOnLayoutListener(this);                WindowManager wm = (WindowManager) ProjectActivity.this.getSystemService(Context.WINDOW_SERVICE);                int height = wm.getDefaultDisplay().getHeight();                footerView.measure(w, h);                LinearLayout lltitle = (LinearLayout) headerView.findViewById(R.id.chart_title);                lltitle.measure(w, h);                int viewHeight = lltitle.getMeasuredHeight() + footerView.getMeasuredHeight() + (int) (getResources().getDimension(R.dimen.normal_title_bar_h) * 2.5);                chartPager.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, height - viewHeight)); //这里的高绝对不能是WRAP_CONTENT              }        });    }

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