PopupWindow增加半透明蒙层

先看效果图：

实现代码：

BasePopupWindowWithMask.class

package com.example.popupwindowwithmask;

import android.content.Context;
import android.graphics.PixelFormat;
import android.graphics.drawable.ColorDrawable;
import android.os.IBinder;
import android.view.KeyEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.PopupWindow;

/**
 * Created by kk on 2017/7/22.
 */

public abstract class BasePopupWindowWithMask extends PopupWindow {
    protected Context context;
    private WindowManager windowManager;
    private View maskView;

    public BasePopupWindowWithMask(Context context) {
        super(context);
        this.context = context;
        windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        setContentView(initContentView());
        setHeight(initHeight());
        setWidth(initWidth());
        setOutsideTouchable(true);
        setFocusable(true);
        setTouchable(true);
        setBackgroundDrawable(new ColorDrawable());
    }

    protected abstract View initContentView();

    protected abstract int initHeight();

    protected abstract int initWidth();

    @Override
    public void showAsDropDown(View anchor) {
        addMask(anchor.getWindowToken());
        super.showAsDropDown(anchor);
    }

    private void addMask(IBinder token) {
        WindowManager.LayoutParams wl = new WindowManager.LayoutParams();
        wl.width = WindowManager.LayoutParams.MATCH_PARENT;
        wl.height = WindowManager.LayoutParams.MATCH_PARENT;
        wl.format = PixelFormat.TRANSLUCENT;//不设置这个弹出框的透明遮罩显示为黑色
        wl.type = WindowManager.LayoutParams.TYPE_APPLICATION_PANEL;//该Type描述的是形成的窗口的层级关系
        wl.token = token;//获取当前Activity中的View中的token,来依附Activity
        maskView = new View(context);
        maskView.setBackgroundColor(0x7f000000);
        maskView.setFitsSystemWindows(false);
        maskView.setOnKeyListener(new View.OnKeyListener() {
            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                if (keyCode == KeyEvent.KEYCODE_BACK) {
                    removeMask();
                    return true;
                }
                return false;
            }
        });
        /**
         * 通过WindowManager的addView方法创建View，产生出来的View根据WindowManager.LayoutParams属性不同，效果也就不同了。
         * 比如创建系统顶级窗口，实现悬浮窗口效果！
         */
        windowManager.addView(maskView, wl);
    }

    private void removeMask() {
        if (null != maskView) {
            windowManager.removeViewImmediate(maskView);
            maskView = null;
        }
    }

    @Override
    public void dismiss() {
        removeMask();
        super.dismiss();
    }
}

TestPopupWindow.class

package com.example.popupwindowwithmask;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.WindowManager;

/**
 * Created by kk on 2017/7/22.
 */

public class TestPopupWindow extends BasePopupWindowWithMask {
    private int[] mIds;
    private View contentView;
    private OnItemClickListener listener;

    public interface OnItemClickListener {
        void OnItemClick(View v);
    }

    public void setOnItemClickListener(OnItemClickListener listener) {
        this.listener = listener;
    }

    public TestPopupWindow(Context context, int[] mIds) {
        super(context);
        this.mIds = mIds;

        initListener();
    }

    @Override
    protected View initContentView() {
        contentView = LayoutInflater.from(context).inflate(R.layout.pop_layout, null, false);
        return contentView;
    }

    private void initListener() {
        for (int i = 0; i < mIds.length; i++) {
            contentView.findViewById(mIds[i]).setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (null != listener) {
                        listener.OnItemClick(v);
                    }
                    dismiss();
                }
            });
        }
    }

    @Override
    protected int initHeight() {
        return WindowManager.LayoutParams.WRAP_CONTENT;
    }

    @Override
    protected int initWidth() {
        return (int) (0.5 * UIUtils.getScreenWidth(context));
    }
}

MainActivity.class

package com.example.popupwindowwithmask;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private TextView textView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView = (TextView) findViewById(R.id.tv_popup);


        final TestPopupWindow testPopupWindow = new TestPopupWindow(this, new int[]{R.id.pop_location, R.id.pop_group, R.id.pop_list});

        textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                testPopupWindow.showAsDropDown(textView);
            }
        });

        testPopupWindow.setOnItemClickListener(new TestPopupWindow.OnItemClickListener() {
            @Override
            public void OnItemClick(View v) {
                switch (v.getId()) {
                    case R.id.pop_location:
                        Toast.makeText(MainActivity.this, "地址", Toast.LENGTH_SHORT).show();
                        break;
                    case R.id.pop_group:
                        Toast.makeText(MainActivity.this, "分组", Toast.LENGTH_SHORT).show();
                        break;
                    case R.id.pop_list:
                        Toast.makeText(MainActivity.this, "清单", Toast.LENGTH_SHORT).show();
                        break;
                }
            }
        });
    }
}

pop_layout.xml

pop_background.xml

UIUtils.class

package com.example.popupwindowwithmask;

import android.content.Context;

/**
 * Created by kk on 2017/7/22.
 */

public class UIUtils {
    /**
     * 获得屏幕宽度
     *
     * @param context
     * @return
     */
    public static int getScreenWidth(Context context) {
        return context.getResources().getDisplayMetrics().widthPixels;
    }

    /**
     * 获得屏幕高度
     *
     * @param context
     * @return
     */
    public static int getScreenHeight(Context context) {
        return context.getResources().getDisplayMetrics().heightPixels;
    }

}

源码：http://download.csdn.net/detail/qq_33748378/9908042

参考资料：

https://developer.android.google.cn/reference/android/view/WindowManager.html

https://developer.android.google.cn/reference/android/view/WindowManager.LayoutParams.html