android获取屏幕大小

1.MainActivity.java

package fanxiaoli.screen;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private TextView tv;
    private Button btn;
    //获取手机屏幕分辨率的类
    private DisplayMetrics dm;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tv = (TextView)findViewById(R.id.tv);
        btn = (Button)findViewById(R.id.btnOK);
        btn.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {
                dm = new DisplayMetrics();
                getWindowManager().getDefaultDisplay().getMetrics(dm);
                //获得手机的宽度和高度像素单位为px
                String strPM = "手机屏幕分辨率为:" + dm.widthPixels+"* "+dm.heightPixels;
                tv.setText(strPM);
            }
        });


    }
}

2.activity_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:id="@+id/tv"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="手机分辨率为:"/>
    <Button
        android:id="@+id/btnOK"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="获取手机分辨率"/>
</LinearLayout>