MainActivity.java

package com.baru.checkdisplay;

import android.app.Activity;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.Menu;
import android.widget.TextView;

/**
 * 
 * <h3><b>MainActivity</b></h3></br>
 * 
 * @author aincc@barusoft.com
 * @version 1.0.0
 * @since 1.0.0
 */
public class MainActivity extends Activity
{
	private TextView info;

	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		info = (TextView) findViewById(R.id.info);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu)
	{
		getMenuInflater().inflate(R.menu.activity_main, menu);
		return true;
	}

	@Override
	protected void onResume()
	{
		checkDisplay();
		super.onResume();
	}

	/**
	 * 
	 * @since 1.0.0
	 */
	private void checkDisplay()
	{
		DisplayMetrics displayMetrics = new DisplayMetrics();
		getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);

		StringBuilder sb = new StringBuilder();
		sb.append("< Display Information >\n\n");
		sb.append("xdpi = ").append(displayMetrics.xdpi).append("\n");
		sb.append("ydpi = ").append(displayMetrics.ydpi).append("\n");
		sb.append("scaledDensity = ").append(displayMetrics.scaledDensity).append("\n");
		sb.append("densityDpi = ").append(displayMetrics.densityDpi).append("\n");
		sb.append("density = ").append(displayMetrics.density).append("\n");
		sb.append("widthPixels = ").append(displayMetrics.widthPixels).append("\n");
		sb.append("heightPixels = ").append(displayMetrics.heightPixels).append("\n");

		// API Level 13
		// Point outSize = new Point();
		// getWindowManager().getDefaultDisplay().getSize(outSize);
		// sb.append("width = ").append(outSize.x).append("\n");
		// sb.append("height = ").append(outSize.y).append("\n");

		// px = dp * displayMetrics.densityDpi

		info.setText(sb.toString());
	}

}