擷取android的實際解析度跟DPI

package com.example.myapp;

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

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

     
        String lcd_info = ""; 
        Display display = getWindowManager().getDefaultDisplay();         
        DisplayMetrics dm = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);
        int width = dm.widthPixels;
        int height = dm.heightPixels; 
  
        float density = dm.densityDpi;
        lcd_info += "\n" +" 解析度:" + width + "*" +height;
        lcd_info += "\n" +" 螢幕密度:" + density;
        
        TextView wf = new TextView(this);
        wf.setText(lcd_info);
        setContentView(wf);
        

        
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
}