DisplayMetrics获取手机屏幕大小（宽高）

<?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:id="@+id/tv"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
</LinearLayout>

package gphone.ex03_05;

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

public class EX03_05 extends Activity {
/** Called when the activity is first created. */
TextView tv=null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
DisplayMetrics dm=new DisplayMetrics();
this.getWindowManager().getDefaultDisplay().getMetrics(dm);
String str="手机屏幕的分辨率为"+dm.widthPixels+" x "+dm.heightPixels;
tv=(TextView)this.findViewById(R.id.tv);
tv.setText(str);
}
}