自定义View继承现有的Toast，实现订单提醒的Toast，从左下角显示然后退出

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/** * Created by  on 16-2-4. */public class NotifyToast extends Toast {    private long lastShowTime;    public static NotifyToast instance;    public static synchronized NotifyToast getInstance(Context context){        if(instance==null){            instance = new NotifyToast(context,"你有未处理的订单，请抓紧处理",3000);        }        return instance;    }    private MediaPlayer mPlayer;    /**     * Construct an empty Toast object.  You must call {@link #setView} before you     * can call {@link #show}.     *     * @param context The context to use.  Usually your {@link Application}     *                or {@link Activity} object.     */    public NotifyToast(Context context,CharSequence text, int duration) {        super(context);        mPlayer = MediaPlayer.create(context, R.raw.neworder);        //2016年08月02日10:51:32 不需要设置完成后释放资源的回调，整段注释掉了//        mPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener()//        {//            @Override//            public void onCompletion(MediaPlayer mp)//            {////                mp.release();// 释放资源。让资源得到释放;;//            }//        });        LayoutInflater inflate = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);        DisplayMetrics dm = context.getResources().getDisplayMetrics();        View v = inflate.inflate(R.layout.new_data_toast, null);        // v.setMinimumWidth(dm.widthPixels);// 设置控件最小宽度为手机屏幕宽度        setView(v);        this.setDuration(duration);// 设置 显示多长时间;;;;        this.setGravity(Gravity.LEFT|Gravity.BOTTOM, (int) (dm.density * 10), (int) (dm.density * 10));    }    public void show() {        long nowTime = new Date().getTime();        if (nowTime - lastShowTime > 10000) {            super.show();            if(mPlayer!=null) {                mPlayer.start();            }            lastShowTime = nowTime;        }    }}

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