判断当前设备加载多少分辨率的图

设备加载图除了和屏幕的分辨率有关，而且还和设备的物理尺寸有关；

DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
Log.d("SplashActivity", "xdpi:" + metrics.xdpi);
Log.d("SplashActivity", "ydpi:" + metrics.ydpi);
Log.d("SplashActivity", "width pixels:" + metrics.widthPixels);
Log.d("SplashActivity", "height pixels:" + metrics.heightPixels);
Log.d("SplashActivity", "densityDpi:" + metrics.densityDpi);

switch (metrics.densityDpi) {
case DisplayMetrics.DENSITY_LOW:
Toast.makeText(this, "L-dip", Toast.LENGTH_SHORT).show();
break;
case DisplayMetrics.DENSITY_MEDIUM:
Toast.makeText(this, "M-dip", Toast.LENGTH_SHORT).show();
break;
case DisplayMetrics.DENSITY_HIGH:
Toast.makeText(this, "H-dip", Toast.LENGTH_SHORT).show();
break;
case DisplayMetrics.DENSITY_XHIGH:
Toast.makeText(this, "xh-dip", Toast.LENGTH_SHORT).show();
break;
default:
Toast.makeText(this, "dip:" + metrics.densityDpi,
Toast.LENGTH_SHORT).show();