Android中使用Toast.cancel()方法優化toast內容顯示的解決方法

2020-04-11 12:25:18

字體：大中小

來源：轉載

供稿：網友

產品在測試過程中發現一個bug，就是測試人員不停的瘋狂的點擊某個按鈕，觸發了toast以后，toast內容會一直排著隊的顯示出來，不能很快的消失。這樣可能會影響用戶的使用。

看到Toast有一個cancel()方法：

void cancel() 
Close the view if it's showing, or don't show it if it isn't showing yet. 

做程序員的，基本一看api就知道，用這個可以取消上一個toast的顯示，然后顯示下一個，這樣就能解決出現的問題。可是在測試的過程中，發現卻沒有想象中的那么簡單，不信可以百度一下，很多很多人發現toast的cancel()方法不起作用。還是不講具體過程，只講結果吧。

我把toast做成了一個應用類，方便使用，大家可以直接用：

復制代碼代碼如下:

package com.arui.framework.android.util;  

import android.content.Context;  
import android.os.Handler;  
import android.os.Looper;  
import android.widget.Toast;  

復制代碼代碼如下:

/**    
 * Toast util class.    
 *     
 * @author <A >http://VeVB.COm</A>    
 * @version 2011/11/30    
 *     
 */   
public class ToastUtil {  

    private static Handler handler = new Handler(Looper.getMainLooper());  

    private static Toast toast = null;  

    private static Object synObj = new Object();  

    public static void showMessage(final Context act, final String msg) {  
        showMessage(act, msg, Toast.LENGTH_SHORT);  
    }  

    public static void showMessage(final Context act, final int msg) {  
        showMessage(act, msg, Toast.LENGTH_SHORT);  
    }  

    public static void showMessage(final Context act, final String msg,  
            final int len) {  
        new Thread(new Runnable() {  
            public void run() {  
                handler.post(new Runnable() {  
                    @Override  
                    public void run() {  
                        synchronized (synObj) {  
                            if (toast != null) {  
                                toast.cancel();  
                                toast.setText(msg);  
                                toast.setDuration(len);  
                            } else {  
                                toast = Toast.makeText(act, msg, len);  
                            }  
                            toast.show();  
                        }  
                    }  
                });  
            }  
        }).start();  
    }  

  
    public static void showMessage(final Context act, final int msg,  
            final int len) {  
        new Thread(new Runnable() {  
            public void run() {  
                handler.post(new Runnable() {  
                    @Override  
                    public void run() {  
                        synchronized (synObj) {  
                            if (toast != null) {  
                                toast.cancel();  
                                toast.setText(msg);  
                                toast.setDuration(len);  
                            } else {  
                                toast = Toast.makeText(act, msg, len);  
                            }  
                            toast.show();  
                        }  
                    }  
                });  
            }  
        }).start();  
    }  

}  