有两种方式：

第一种：post给Handler

        // 开启线程刷新
        handler = new Handler();

        timer = new Timer();
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        mTextLat.setText(AppContext.getLatitude()+"");
                        mTextLng.setText(AppContext.getLongitude()+"");
                    }
                });
            }
        },0,1*1000);

第二种：给Handler发信息

// 开启线程刷新
        handler = new Handler(){
            @Override
            public void handleMessage(Message msg) {
                switch (msg.what) {
                    case 1:
                        mTextLat.setText(AppContext.getLatitude()+"");
                        mTextLng.setText(AppContext.getLongitude()+"");
                }
                super.handleMessage(msg);
            }
        };

        timer = new Timer();
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                Message msg = new Message();
                msg.what = 1;
                handler.sendMessage(msg);
            }
        },0,1*1000);

TimerTask中如何通过Handler交由UIThread更新UI