取得手机屏幕大小 DisplayMetrics

package com.wzc.test;import android.content.res.Resources;import android.graphics.Color;import android.graphics.drawable.Drawable;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.DisplayMetrics;import android.widget.TextView;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        TextView mTv1= (TextView) findViewById(R.id.tv_1);        DisplayMetrics dm = new DisplayMetrics();        getWindowManager().getDefaultDisplay().getMetrics(dm);        String strOpt = "手机屏幕分辨率为：" +                dm.widthPixels + " x " + dm.heightPixels;        mTv1.setText(strOpt);    }}