activity.getWindowManager().getDefaultDisplay();

Rect outRect = new Rect();

activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(outRect);

Rect outRect = new Rect();

activity.getWindow().findViewById(Window.ID_ANDROID_CONTENT).getDrawingRect(outRect);

package com.example.testactivity;

import android.app.Activity;

import android.os.Bundle;

import android.util.DisplayMetrics;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

public class TextActivity extends Activity {

    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.textView1);

        btn=(Button)findViewById(R.id.button1);

        btn.setOnClickListener(new OnClickListener() {

            @Override

            public void onClick(View v) {

                // TODO Auto-generated method stub

                dm=new DisplayMetrics();

                getWindowManager().getDefaultDisplay().getMetrics(dm);

            //获得手机宽高

                String strPM="手机分辨率为："+dm.widthPixels+"*"+dm.heightPixels;

                tv.setText(strPM);

            }

        });

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.main, menu);

        return true;

    }

}