封装 Toast 

一、 ToastView.java


 1 import android.content.Context;
 2 import android.view.LayoutInflater;
 3 import android.view.View;
 4 import android.widget.ImageView;
 5 import android.widget.LinearLayout;
 6 import android.widget.TextView;
 7 import android.widget.Toast;
 8 
 9 
10 public class ToastView extends LinearLayout{
11     private static ToastView mToastView;
12     
13     private TextView toastText;
14     private ImageView toastIcon;
15     private Context mContext;
16     
17     private View layout;
18     private Toast mToast;
19     
20 
21     private ToastView(Context context) {
22         super(context,null);
23         mContext = context;
24         LayoutInflater inflater = (LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);  
25         layout = inflater.inflate(R.layout.toast, null);  
26         
27         toastIcon = (ImageView) layout.findViewById(R.id.toastIcon);
28         toastText = (TextView) layout.findViewById(R.id.toastText);
29     }
30     
31     public static ToastView getInstance(Context context) {
32         if (mToastView != null) {
33             return mToastView;
34         } else {
35             if (context != null) {
36                 mToastView = new ToastView(context);
37                 return mToastView;
38             } else {
39                 return null;
40             }
41         }
42     }
43     
44     public void setIconVisiblity(int visiblity){
45         toastIcon.setVisibility(visiblity);
46     }
47     
48     public void showToast(String str,int gravity,int xoffset,int yoffest) {
49         toastText.setText(str);
50         
51         if(mToast!=null){
52             mToast.setGravity(gravity,xoffset,yoffest);
53             mToast.show();
54         }else{
55             mToast= new Toast(mContext);
56             mToast.setView(layout);  
57             mToast.setGravity(gravity,xoffset,yoffest);
58             mToast.setDuration(Toast.LENGTH_SHORT);
59             mToast.show();
60         }
61     }
62     
63     public void showToast(String str,int gravity,int xoffset,int yoffest,int duration) {
64         toastText.setText(str);
65         duration = duration<=0 ? Toast.LENGTH_SHORT : duration;
66         
67         if(mToast!=null){
68             mToast.setGravity(gravity,xoffset,yoffest);
69             mToast.setDuration(duration);
70             mToast.show();
71         }else{
72             mToast= new Toast(mContext);
73             mToast.setView(layout);  
74             mToast.setGravity(gravity,xoffset,yoffest);
75             mToast.setDuration(duration);
76             mToast.show();
77         }
78     }
79 
80 }

 

 

二、toast.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="fill_parent"
 4     android:layout_height="wrap_content"
 5     android:gravity="center_vertical">
 6 
 7 
 8     <TextView
 9         android:id="@+id/toastText"
10         android:layout_width="wrap_content"
11         android:layout_height="@dimen/toastHeight"
12         android:textColor="@color/title_text_color"
13         android:background="@drawable/toast_bg"
14         android:gravity="center"
15         android:paddingLeft="@dimen/toastTextPaddingLeft"
16         android:paddingRight="@dimen/toastTextPaddingRight"
17         android:textSize="@dimen/toastTextSize"/>
18     
19     <ImageView
20         android:id="@+id/toastIcon"
21         android:layout_width="@dimen/toastIconWidth"
22         android:layout_height="@dimen/toastIconWidth"
23         android:layout_marginLeft="@dimen/toastIconWidth"
24         android:scaleType="fitXY"
25         android:layout_centerVertical="true"
26         android:src="@drawable/toast_icon" />
27 </RelativeLayout>

 

三、Acitivity中调用

    
    //自定义的
    private void showToast(String str, int offset) {
        ToastView toast = ToastView.getInstance(RecommendActivity.this); 
        if(offset < 0){
            toast.showToast(str, Gravity.TOP | Gravity.CENTER_HORIZONTAL,0,　　　　//默认时长的Toast
                    (int)getResources().getDimension(R.dimen.defaultToastMarginTop));
        }else{
            toast.showToast(str, Gravity.TOP | Gravity.CENTER_HORIZONTAL,0,　　　　//自定义时长的Toast
                    (int)getResources().getDimension(R.dimen.defaultToastMarginTop), offset);
        }
    }

 

封装的这个Toast没什么技术含量。

但是，之所以把Toast定义为单例模式，是为了防止疯狂点击按钮，出现连续不断的Toast

因为系统的Toast是维护一个队列，每次cancle只对当前的Toast 有用。所以之后的Toast还是会不停出现

 

这个Toast改为单例模式之后。如果当前Toast不为空，只对其进行setText。然后show（不调用show不会出现）

如果当前为空，才会新建一个ToastView。

 

posted @ 2014-12-17 15:33  马小豆包  阅读(352)  评论(0)  编辑  收藏  举报