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
importandroid.content.Context;
importandroid.graphics.PixelFormat;
importandroid.os.Handler;
importandroid.os.Looper;
importandroid.os.Message;
importandroid.view.Gravity;
importandroid.view.WindowManager;
importandroid.widget.TextView;
importandroid.widget.Toast;
publicclassToastUtil{
//方法一
privatestaticHandlermHandler=newHandler(Looper.getMainLooper());
privatestaticToastmToast=null;
privatestaticObjectsynObject=newObject();
publicstaticvoidshowToastByThread(Contextcontext,Stringmsg){
showToastByThread(context,msg,Toast.LENGTH_SHORT);
}
publicstaticvoidshowToastByThread(Contextcontext,intmsg){
showToastByThread(context,context.getText(msg),Toast.LENGTH_SHORT);
}
publicstaticvoidshowToastByThread(finalContextcontext,finalCharSequencemsg,finalintlength){
newThread(newRunnable(){
@Override
publicvoidrun(){
mHandler.post(newRunnable(){
@Override
publicvoidrun(){
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
privatestaticlongoneTime;
privatestaticlongtwoTime;
privatestaticStringoldMsg;
publicstaticvoidshowToastByTime(Contextcontext,Stringmsg){
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;
}
publicstaticvoidshowToastByTime(Contextcontext,intmsg){
showToastByTime(context,context.getString(msg));
}
//方法三
publicstaticTextViewmTextView;
publicstaticWindowManagermWindowManager=null;
privatestaticHandlermPriHandler=newHandler(){
@Override
publicvoidhandleMessage(Messagemsg){
cancelToast();
}
};
publicstaticvoidshowToastByWindow(Contextcontext,Stringmsg){
mWindowManager=(WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
if(mTextView==null){
mTextView=newTextView(context);
}
mTextView.setText(msg);
mTextView.setTextSize(20);
mTextView.setPadding(0,0,0,30);
if(mTextView.getParent()==null){
WindowManager.LayoutParamsparams=newWindowManager.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);
}
}
publicstaticvoidcancelToast(){
if(mTextView!=null&&mTextView.getParent()!=null){
mWindowManager.removeView(mTextView);
}
}
}
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希望本文所述对大家Android程序设计有所帮助。