Android中怎樣獲取手機分辨率

package com.entity;

import android.os.Bundle;
import android.util.DisplayMetrics;
import android.app.Activity;
/**
 * 獲取手機分辨率
 * DisplayMetrics:顯示尺寸
 * Pixels像素
 * @author 小柔
 *
 */
public class MainActivity extends Activity {

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

DisplayMetrics metrics=new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int width=metrics.widthPixels;
int height=metrics.heightPixels;
MainView mv=new MainView(MainActivity.this, width, height);

//設置顯示內容
setContentView(mv);
}

}

package com.entity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.view.View;
/**
 * 顯示
 * @author 小柔
 *
 */
public class MainView extends View{
private int width;
private int height;
private Paint paint;

//構造方法
public MainView(Context context,int w,int h) {
super(context);
this.width=w;
this.height=h;

paint=new Paint();//實例化一隻筆
paint.setStyle(Style.STROKE);//設置爲空心
paint.setStrokeWidth(1);//設置筆的粗細
paint.setTextSize(20);//設置字體大小
}

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//顯示分辨率
canvas.drawText("你的手機分辨率爲"+width+"*"+height,100,100,paint);
}
}