用PopupWindow实现自定义Dailog

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Android的PopupWindow是个很有用的widget，利用它可以实现悬浮窗体的效果，比如实现一个悬浮的菜单，最常见的应用就是在视频播放界面里，做一个工具栏，用来控制播放进度。本文利用PopupWindow来实现一个通用的Dailog，类似Android系统的AlertDailog，从中学习和掌握有关PopupWindow和Dailog的使用和实现细节。

界面效果如图所示，点击 Click 按钮后，弹出对话框提示。

1. CustomDailog的布局

首先定义 CustDailog的布局文件，由系统的AlertDailog可以知道，一个对话框包含了三个要素，一个是Title，即标题，一个是Message，即主体内容，还有一个是Button，即确定和取消的按钮，用来与用户交互。因此，布局设计如下：

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:background="@drawable/shape_bg"
    android:layout_margin="10dp">
                                                                                                                                                                                                                                                                                                                  
    <TextView      
        android:id="@+id/CustomDlgTitle"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textStyle="bold"
        android:textSize="20sp"
        android:layout_margin="10dp"
        android:gravity="center"/>
                                                                                                                                                                                                                                                                                                                      
    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="@android:color/darker_gray"/>
                                                                                                                                                                                                                                                                                                                      
    <LinearLayout
        android:id="@+id/CustomDlgContentView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_margin="5dp" />
                                                                                                                                                                                                                                                                                                                  
    <TextView
        android:id="@+id/CustomDlgContentText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="15sp"
        android:layout_margin="5dp"
        android:paddingLeft="5sp"/>
                                                                                                                                                                                                                                                                                                              
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_margin="5dp" >
                                                                                                                                                                                                                                                                                                                  
        <Button
            android:id="@+id/CustomDlgButtonOK"
            android:layout_width="0dp"
            android:layout_weight="0.5"
            android:layout_height="wrap_content"
            android:visibility="gone"/>
                                                                                                                                                                                                                                                                                                                          
        <Button
            android:id="@+id/CustomDlgButtonCancel"
            android:layout_width="0dp"
            android:layout_weight="0.5"
            android:layout_height="wrap_content"          
            android:visibility="gone"/>
                                                                                                                                                                                                                                                                                                            
    </LinearLayout>
                                                                                                                                                                                                                                                                                                              
</LinearLayout>

其中，shap_bg.xml 是Dailog的背景的定义文件，你可以修改此文件，来改变Dailog的背景：

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<?xml version="1.0" encoding="UTF-8"?>
<shape android:shape="rectangle"
  xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="#e6ecee" />
    <stroke  android:width="1.0dip" android:color="@android:color/darker_gray" />
    <corners android:radius="8.0dip" />
</shape>

（2） CustomDailog的定义

CustomDailog的接口，可以类比AlertDailg的接口定义，主要包括如下一些方法：

1. setTitle 设置标题

2. setMessage 设置主体内容

3. setPositiveButton 设置 “确定” 按钮

4. setNegativeButton 设置 “取消” 按钮

5. show 显示

6. dimiss 消失

其定义如下：

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package com.ticktick.popdailog;
                                                                                                                                                 
import android.content.Context;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.PopupWindow;
import android.widget.TextView;
                                                                                                                                                     
public class CustomDailog {
                                                                                                                                                
    private View mParent;
    private PopupWindow mPopupWindow;
    private LinearLayout mRootLayout;  
    private LayoutParams mLayoutParams; 
                                                                                                                                                
    //PopupWindow必须有一个ParentView，所以必须添加这个参数
    public CustomDailog(Context context, View parent) {
                                                                                                                                                    
        mParent = parent;
                                                                                                                                                    
        LayoutInflater mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);      
                                                                                                                                                    
        //加载布局文件
        mRootLayout = (LinearLayout)mInflater.inflate(R.layout.custom_dailog, null);  
                                                                                                                                                           
        mLayoutParams = new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
    }  
                                                                                                                                                
    //设置Dailog的标题
    public void setTitle(String title) {
        TextView mTitle = (TextView)mRootLayout.findViewById(R.id.CustomDlgTitle);
        mTitle.setText(title);
    }
                                                                                                                                                
    //设置Dailog的主体内容
    public void setMessage(String message) {
        TextView mMessage = (TextView)mRootLayout.findViewById(R.id.CustomDlgContentText);
        mMessage.setText(message);
    }
                                                                                                                                                
    //设置Dailog的“确定”按钮
    public void setPositiveButton(String text,OnClickListener listener ) {
        final Button buttonOK = (Button)mRootLayout.findViewById(R.id.CustomDlgButtonOK);
        buttonOK.setText(text);
        buttonOK.setOnClickListener(listener);
        buttonOK.setVisibility(View.VISIBLE);
    }
                                                                                                                                                
    //设置Dailog的“取消”按钮
    public void setNegativeButton(String text,OnClickListener listener ) {
        final Button buttonCancel = (Button)mRootLayout.findViewById(R.id.CustomDlgButtonCancel);
        buttonCancel.setText(text);
        buttonCancel.setOnClickListener(listener);
        buttonCancel.setVisibility(View.VISIBLE);
    }
                                                                                                                                                
    //替换Dailog的“主体”布局
    public void setContentLayout(View layout) {
                                                                                                                                                    
        TextView mMessage = (TextView)mRootLayout.findViewById(R.id.CustomDlgContentText);
        mMessage.setVisibility(View.GONE);
                                                                                                                                                    
        LinearLayout contentLayout = (LinearLayout)mRootLayout.findViewById(R.id.CustomDlgContentView);      
        contentLayout.addView(layout);              
    }
                                                                                                                                                
    //设置Dailog的长宽
    public void setLayoutParams(int width, int height) {
        mLayoutParams.width  = width;
        mLayoutParams.height = height;
    }
                                                                                                                                                
    //显示Dailog
    public void show() {
                                                                                                                                                
        if(mPopupWindow == null) {
            mPopupWindow = new PopupWindow(mRootLayout, mLayoutParams.width,mLayoutParams.height);
            mPopupWindow.setFocusable(true);
        }
                                                                                                                                                    
        mPopupWindow.showAtLocation(mParent, Gravity.CENTER, Gravity.CENTER, Gravity.CENTER);
    }
                                                                                                                                                
    //取消Dailog的显示
    public void dismiss() {
                                                                                                                                                    
        if(mPopupWindow == null) {
            return;
        }
                                                                                                                                                    
        mPopupWindow.dismiss();
    }
}

（3）在Activity中的使用方法

由于 PopupWindow 的显示必须给一个ParentView，在Activity中使用的话，最简单的方法就是将整个activity的“根View”传递给这个PopupWindow，这样就可以在整个屏幕的正中央来显示Dailog，获取Acitivity的根View的方法如下：

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findViewById(android.R.id.content)).getChildAt(0);

因此，上面定义的 CunstomDailog的使用方法如下所示：

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final CustomDailog dailog = new CustomDailog(this,getRootLayout());
dailog.setTitle("Warning");
dailog.setMessage("This is ticktick's blog!");
dailog.setPositiveButton("OK", new OnClickListener() {        
    @Override
    public void onClick(View v) {
        dailog.dismiss();         
    }
});
dailog.setNegativeButton("Cancel", new OnClickListener() {        
    @Override
    public void onClick(View v) {
    dailog.dismiss();         
    }
});
dailog.show();

到此为止，整个Dailog的实现就介绍到这里了

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