Android 屏幕密度及其分辨率获取

以下是三种常见的获取方法：

    // 1、windowManager 获取
    private void windowManager_ScreenDensity() {
        //DisplayMetrics 封装了显示区域的各种属性
        //实例化分辨率容器
        DisplayMetrics displayMetrics = new DisplayMetrics();
        //获取分辨率信息
        getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);

        int width = displayMetrics.widthPixels;
        int height = displayMetrics.heightPixels;
        //屏幕密度
        //每英寸内容容纳的点的个数

        /*
         常用的几个值
        DENSITY_LOW = 120
        DENSITY_MEDIUM = 160  //默认值
        DENSITY_TV = 213      //TV专用
        DENSITY_HIGH = 240
        DENSITY_XHIGH = 320
        DENSITY_400 = 400
        DENSITY_XXHIGH = 480
        DENSITY_XXXHIGH = 640
        */
        int dpi = displayMetrics.densityDpi;
        float density = displayMetrics.density;

        Log.e("HyDetection", "width->" + width + "--height-->" + height + "--dpi-->" + dpi + "---density-->" + density);

    }

    //2、resource 资源获取
    private void resources_ScreenDensity() {

        DisplayMetrics displayMetrics = getResources().getDisplayMetrics();
        int width = displayMetrics.widthPixels;
        int height = displayMetrics.heightPixels;
        int dpi = displayMetrics.densityDpi;
        float density = displayMetrics.density;
        Log.e("HyDetection", "width->" + width + "--height-->" + height + "--dpi-->" + dpi + "---density-->" + density);
    }

    //3、display 获取
    //Display 代指显示区域这个对象，它可以是真实的物理屏幕，或指程序的显示区域
    private void default_ScreenDensity() {
        
        Display display = getWindowManager().getDefaultDisplay();
        int disId = display.getDisplayId();
        Point point = new Point();
        display.getSize(point);
        int width = point.x;
        int height = point.y;

        Log.e("HyDetection", "width-->" + width + "---" + "height-->" + height + "---disId-->" + disId);
        DisplayMetrics displayMetrics = new DisplayMetrics();
        display.getMetrics(displayMetrics);
        width = displayMetrics.widthPixels;
        height = displayMetrics.heightPixels;
        int dpi = displayMetrics.densityDpi;
        float density = displayMetrics.density;
        Log.e("HyDetection", "width->" + width + "--height-->" + height + "--dpi-->" + dpi + "---density-->" + density);
    }