Toast类避免显示时间叠加的方法

import android.app.Activity;import android.app.Fragment;import android.content.Context;import android.widget.Toast; /** * Toast工具类 * Created by user on 2016/12/22. */ public class ToastUtil {   private static Toast toast = null;  private static ToastUtil toastUtil = null;   public ToastUtil(){}   public synchronized static ToastUtil getInstance(){    if(null == toastUtil){      toastUtil = new ToastUtil();    }     return toastUtil;  }   public void showToast(Context context, String string){     if(toast != null){      toast.cancel();    }      toast = Toast.makeText(context, string,Toast.LENGTH_SHORT);      toast.show();  }   public void showToast(Fragment fragment, String string){    showToast(fragment.getActivity(),string);  }   public void showToast(Activity activity, String string){    if(toast != null){      toast.cancel();    }    toast = Toast.makeText(activity, string,Toast.LENGTH_SHORT);    toast.show();  }   public void showToastTest(Context context){    if(toast != null){      toast.cancel();    }    toast = Toast.makeText(context, "click",Toast.LENGTH_SHORT);    toast.show();  }   public void showToastTest(Fragment fragment){    showToastTest(fragment.getActivity());  }   public void showToastTest(Activity activity){    if(toast != null){      toast.cancel();    }    toast = Toast.makeText(activity, "click",Toast.LENGTH_SHORT);    toast.show();  }}     if(null == toastUtil){      toastUtil = new ToastUtil();    }     return toastUtil;  }public void showToastInThread(Context context,String msg){    Looper.prepare();    if(toast != null){      toast.cancel();    }    toast = Toast.makeText(context,msg,Toast.LENGTH_SHORT);    toast.show();    Looper.loop();  }  public void showToast(Context context, String string){     if(toast != null){      toast.cancel();    }      toast = Toast.makeText(context, string,Toast.LENGTH_SHORT);      toast.show();  } }

ToastUtil.getInstance().showToast(mContext,"test");

ToastUtil.getInstance().showToastInThread(mContext,"str");