獲取顯示屏幕的信息

通過DisplayMetrics, 可以獲取顯示屏幕的有關信息, 包括:
widthPixels: 屏幕的水平分辨率.
heightPixels: 屏幕的垂直分辨率.
density: 屏幕的邏輯密度.
densityDpi: 以每英寸多少點(dots-per-insh)顯示屏幕的邏輯密度.
scaledDensity: 字體顯示的縮放係數.
xdpi: 水平的每英寸多少確切的物理像素.
ydpi: 水平的每英寸多少確切的物理像素.



main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  >
<TextView
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="@string/hello"
  />
<TextView
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:id="@+id/textscreen"
  />
</LinearLayout>

AndroidDisplayResolution.java

package com.AndroidDisplayResolution;

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

public class AndroidDisplayResolution extends Activity {
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
    
      TextView textScreen = (TextView)findViewById(R.id.textscreen);
    
      DisplayMetrics dm = new DisplayMetrics();
      getWindowManager().getDefaultDisplay().getMetrics(dm);
      textScreen.setText(
        "Screen Width: " + String.valueOf(dm.widthPixels) + "\n" +
        "Screen Height: " + String.valueOf(dm.heightPixels) + "\n" +
        "Density: " + String.valueOf(dm.density) + "\n" +
        "DensityDPI: " + String.valueOf(dm.densityDpi) + "\n" +
        "Scaled Density: " + String.valueOf(dm.scaledDensity) + "\n" +
        "X DPI: " + String.valueOf(dm.xdpi) + "\n" +
        "Y DPI: " + String.valueOf(dm.ydpi) + "\n");
  }
}