Get Android's releaseVersion, SDK Version, Screen DPIs.

gistfile1.java

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		TextView versionTv = (TextView) findViewById(R.id.version_tv);
		versionTv.setText(String.format("Version Release:%s", Build.VERSION.RELEASE));
		TextView sdkTv = (TextView) findViewById(R.id.sdk_tv);
		sdkTv.setText(String.format("SDK:%d", android.os.Build.VERSION.SDK_INT));
		TextView resolutionTv = (TextView) findViewById(R.id.resolution_tv);
		resolutionTv.setText(String.format("Resolution(DPI): %s", getDeviceResolution()));
	}

	/**
	 * Get resolution of screen which kind of dpi will be detected.
	 *
	 * @return DPI type in string.
	 */
	private String getDeviceResolution() {
		int density = getResources().getDisplayMetrics().densityDpi;
		switch (density) {
			case DisplayMetrics.DENSITY_MEDIUM:
				return "MDPI";
			case DisplayMetrics.DENSITY_HIGH:
				return "HDPI";
			case DisplayMetrics.DENSITY_LOW:
				return "LDPI";
			case DisplayMetrics.DENSITY_XHIGH:
				return "XHDPI";
			case DisplayMetrics.DENSITY_TV:
				return "TV";
			case DisplayMetrics.DENSITY_XXHIGH:
				return "XXHDPI";
			case DisplayMetrics.DENSITY_XXXHIGH:
				return "XXXHDPI";
			default:
				return "Unknown";
		}
	}