弹出窗体。

package com.lixu.tanchuchuangti;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.PopupWindow;
import android.widget.TextView;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final Activity activity = this;

        final Button button = (Button) findViewById(R.id.button1);

        button.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                LayoutInflater mLayoutInflater = activity.getLayoutInflater();
                View view = mLayoutInflater.inflate(android.R.layout.simple_list_item_1, null);
                TextView tv = (TextView) view.findViewById(android.R.id.text1);

                view.setBackgroundColor(Color.GRAY);
                tv.setTextColor(Color.BLUE);
                tv.setText("你好啊 ！！");

                PopupWindow pw = new PopupWindow(view, 100, 100);
                // 将弹出窗体设置在按钮之下
                // pw.showAsDropDown(button);

                // 设置背景图片
                pw.setBackgroundDrawable(activity.getResources().getDrawable(R.drawable.dfdf));
                // 这里要设置一个背景图片才能触发这个功能
                // 点击窗体外关闭弹出窗体
                pw.setOutsideTouchable(true);
                // 设置弹出框居中
                pw.showAtLocation(activity.getWindow().getDecorView(), Gravity.CENTER, 0, 0);

            }
        });
    }

}

运行效果图：