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);
}