Android编程实现Toast只显示最后一条的方法

本文实例讲述了android编程实现toast只显示最后一条的方法。分享给大家供大家参考，具体如下：

在做android开发中，时不时的可能会用到toast，但用toast的时候，连续使用会存在一个问题，就是一条条显示toast。而不是直接显示最后一条。因此，根据此需求，现在写了toastutil这个类，该类中有三个方法供选择。

toastutil.java

import android.content.context;
import android.graphics.pixelformat;
import android.os.handler;
import android.os.looper;
import android.os.message;
import android.view.gravity;
import android.view.windowmanager;
import android.widget.textview;
import android.widget.toast;
public class toastutil {
  //方法一
  private static handler mhandler = new handler(looper.getmainlooper());
  private static toast mtoast = null;
  private static object synobject = new object();
  public static void showtoastbythread(context context, string msg){
    showtoastbythread(context, msg, toast.length_short);
  }
  public static void showtoastbythread(context context, int msg){
    showtoastbythread(context, context.gettext(msg), toast.length_short);
  }
  public static void showtoastbythread(final context context, final charsequence msg, final int length){
    new thread(new runnable() {
      @override
      public void run() {
        mhandler.post(new runnable() {
          @override
          public void run() {
            synchronized (synobject) {
              if (mtoast != null){
                mtoast.settext(msg);
                mtoast.setduration(length);
              }else{
                mtoast = toast.maketext(context, msg, length);
              }
              mtoast.show();
            }
          }
        });
      }
    }).start();
  }
  //方法二:注意此方法不能再子线程中使用
  private static long onetime;
  private static long twotime;
  private static string oldmsg;
  public static void showtoastbytime(context context, string msg){
    if (mtoast == null) {
      mtoast = toast.maketext(context, msg, toast.length_short);
      mtoast.show();
      onetime = system.currenttimemillis();
    } else {
      twotime = system.currenttimemillis();
      if (msg.equals(oldmsg)){
        if (twotime-onetime > toast.length_short){
          mtoast.show();
        }
      } else {
        oldmsg = msg;
        mtoast.settext(msg);
        mtoast.show();
      }
    }
    onetime = twotime;
  }
  public static void showtoastbytime(context context, int msg){
    showtoastbytime(context, context.getstring(msg));
  }
  //方法三
  public static textview mtextview;
  public static windowmanager mwindowmanager = null;
  private static handler mprihandler = new handler(){
    @override
    public void handlemessage(message msg) {
      canceltoast();
    }
  };
  public static void showtoastbywindow(context context, string msg){
    mwindowmanager = (windowmanager) context.getsystemservice(context.window_service);
    if (mtextview == null){
      mtextview = new textview(context);
    }
    mtextview.settext(msg);
    mtextview.settextsize(20);
    mtextview.setpadding(0, 0, 0, 30);
    if (mtextview.getparent() == null){
      windowmanager.layoutparams params = new windowmanager.layoutparams();
      params.gravity= gravity.bottom;
      params.alpha = 0.65f;
      params.x = 0;
      params.height = windowmanager.layoutparams.wrap_content;
      params.width = windowmanager.layoutparams.wrap_content;
      params.flags = windowmanager.layoutparams.flag_not_focusable |
          windowmanager.layoutparams.flag_not_touchable |
          windowmanager.layoutparams.flag_keep_screen_on |
          windowmanager.layoutparams.flag_layout_in_screen;
      params.format = pixelformat.translucent;
      params.windowanimations = 0;
      mwindowmanager.addview(mtextview, params);
      mprihandler.sendemptymessagedelayed(101, 1000);
    } else {
      mtextview.settext(msg);
      mprihandler.removemessages(101);
      mprihandler.sendemptymessagedelayed(101, 1000);
    }
  }
  public static void canceltoast(){
    if (mtextview != null && mtextview.getparent() != null){
      mwindowmanager.removeview(mtextview);
    }
  }
}

更多关于android相关内容感兴趣的读者可查看本站专题：《android布局layout技巧总结》、《android开发入门与进阶教程》、《android调试技巧与常见问题解决方法汇总》、《android基本组件用法总结》、《android视图view技巧总结》及《android控件用法总结》

希望本文所述对大家android程序设计有所帮助。