弹出popwindow 背景变暗

先看下效果图吧

代码如下

package com.example.administrator.popwindowdemo.view;

import android.app.Activity;

import android.content.Context;

import android.graphics.drawable.ColorDrawable;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup.LayoutParams;

import android.view.WindowManager;

import android.widget.LinearLayout;

import android.widget.PopupWindow;

import com.example.administrator.popwindowdemo.R;

/**

 * Created by Administrator on 2016/4/12.

 */

public class CustomPopwindow extends PopupWindow {

    private View mView;

    public CustomPopwindow(Activity context,View.OnClickListener itemsOnClick){

        super(context);

        initView(context,itemsOnClick);

    }

    private void initView(final Activity context,View.OnClickListener itemsOnClick) {

        // TODO Auto-generated method stub

        LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        mView = mInflater.inflate(R.layout.select_popwindow,null);

        LinearLayout ll_select01 = (LinearLayout) mView.findViewById(R.id.ll_select01);

        LinearLayout ll_select02 = (LinearLayout) mView.findViewById(R.id.ll_select02);

        LinearLayout ll_select03 = (LinearLayout) mView.findViewById(R.id.ll_select03);

        //取消按钮

        ll_select03.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {

                //销毁弹出框

                dismiss();

                backgroundAlpha(context, 1f);

            }

        });

        //设置按钮监听

        ll_select01.setOnClickListener(itemsOnClick);

        ll_select02.setOnClickListener(itemsOnClick);

        //设置SelectPicPopupWindow的View

        this.setContentView(mView);

        //设置SelectPicPopupWindow弹出窗体的宽

        this.setWidth(LayoutParams.FILL_PARENT);

        //设置SelectPicPopupWindow弹出窗体的高

        this.setHeight(LayoutParams.WRAP_CONTENT);

        //设置SelectPicPopupWindow弹出窗体可点击

        this.setFocusable(true);

        //设置PopupWindow可触摸

        this.setTouchable(true);

        //设置非PopupWindow区域是否可触摸

//        this.setOutsideTouchable(false);

        //设置SelectPicPopupWindow弹出窗体动画效果

        this.setAnimationStyle(R.style.select_anim);

        //实例化一个ColorDrawable颜色为半透明

        ColorDrawable dw = new ColorDrawable(0x00000000);

        //设置SelectPicPopupWindow弹出窗体的背景

        this.setBackgroundDrawable(dw);

        backgroundAlpha(context,0.5f);//0.0-1.0

        this.setOnDismissListener(new OnDismissListener() {

            @Override

            public void onDismiss() {

                // TODO Auto-generated method stub

                backgroundAlpha(context, 1f);

            }

        });

    }

    /**

     * 设置添加屏幕的背景透明度

     * @param bgAlpha

     */

    public void backgroundAlpha(Activity context, float bgAlpha)

    {

        WindowManager.LayoutParams lp = context.getWindow().getAttributes();

        lp.alpha = bgAlpha;

        context.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);

        context.getWindow().setAttributes(lp);

    }

}

在Activity中的代码：

public class MainActivity extends AppCompatActivity {

    private CustomPopwindow customPopwindow;

    private Activity mActivity;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        mActivity = this;

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);

        setSupportActionBar(toolbar);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);

        fab.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View view) {

                customPopwindow = new CustomPopwindow(mActivity,itemsOnClick);

                customPopwindow.showAtLocation(view,

                        Gravity.BOTTOM|Gravity.CENTER_HORIZONTAL, 0, 0);

            }

        });

    }

    //为弹出窗口实现监听类

    private View.OnClickListener itemsOnClick = new View.OnClickListener(){

        public void onClick(View v) {

            customPopwindow.dismiss();

            customPopwindow.backgroundAlpha(mActivity,1f);

            switch (v.getId()) {

                case R.id.ll_select01:

                    //do something

                    break;

                case R.id.ll_select02:

                     //do something

                    break;

                default:

                    break;

            }

        }

    };

}

源码下载：https://git.oschina.net/alicelsj/PopwindowDemo