<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:gravity="center_horizontal"
  android:orientation="vertical"
 >
<LinearLayout
  android:id="@+id/pop_layout"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:gravity="center_horizontal"
  android:orientation="vertical"
  android:layout_alignParentBottom="true"
   android:background="@drawable/btn_style_alert_dialog_background"
   >
  <Button
    android:id="@+id/btn_take_photo"
    android:layout_marginLeft="20dip"
    android:layout_marginRight="20dip"
    android:layout_marginTop="20dip"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="拍照"
    android:background="@drawable/btn_style_alert_dialog_button"
    android:textStyle="bold"
     />
  <Button
    android:id="@+id/btn_pick_photo"
    android:layout_marginLeft="20dip"
    android:layout_marginRight="20dip"
    android:layout_marginTop="5dip"
     android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="从相册选择"
     android:background="@drawable/btn_style_alert_dialog_button"
     android:textStyle="bold"
     />
  <Button
    android:id="@+id/btn_cancel"
    android:layout_marginLeft="20dip"
    android:layout_marginRight="20dip"
    android:layout_marginTop="15dip"
    android:layout_marginBottom="15dip"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="取消"
    android:background="@drawable/btn_style_alert_dialog_cancel"
    android:textColor="#ffffff"
    android:textStyle="bold"
    />
</LinearLayout>
</RelativeLayout>

import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.Toast;
public class SelectPicPopupWindow extends Activity implements OnClickListener{
  private Button btn_take_photo, btn_pick_photo, btn_cancel;
  private LinearLayout layout;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.alert_dialog);
    btn_take_photo = (Button) this.findViewById(R.id.btn_take_photo);
    btn_pick_photo = (Button) this.findViewById(R.id.btn_pick_photo);
    btn_cancel = (Button) this.findViewById(R.id.btn_cancel);
    layout=(LinearLayout)findViewById(R.id.pop_layout);
    //添加选择窗口范围监听可以优先获取触点，即不再执行onTouchEvent()函数，点击其他地方时执行onTouchEvent()函数销毁Activity
    layout.setOnClickListener(new OnClickListener() {
      public void onClick(View v) {
        // TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(), "提示：点击窗口外部关闭窗口！",
            Toast.LENGTH_SHORT).show();
      }
    });
    //添加按钮监听
    btn_cancel.setOnClickListener(this);
    btn_pick_photo.setOnClickListener(this);
    btn_take_photo.setOnClickListener(this);
  }
  //实现onTouchEvent触屏函数但点击屏幕时销毁本Activity
  @Override
  public boolean onTouchEvent(MotionEvent event){
    finish();
    return true;
  }
  public void onClick(View v) {
    switch (v.getId()) {
    case R.id.btn_take_photo:
      break;
    case R.id.btn_pick_photo:
      break;
    case R.id.btn_cancel:
      break;
    default:
      break;
    }
    finish();
  }
}

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;
public class MainActivity extends Activity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    TextView tv = (TextView) this.findViewById(R.id.text);
    //把文字控件添加监听，点击弹出自定义窗口
    tv.setOnClickListener(new OnClickListener() {
      public void onClick(View v) {
        startActivity(new Intent(MainActivity.this,SelectPicPopupWindow.class));
      }
    });
  }
}