Android更新文本视图计时器和刷新地图内容？

我有下面的布局文件。基本上我有谷歌地图，在左上角我有一个

TextView

，我需要每隔15秒刷新一次地图。布局很好

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <fragment xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:map="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/map"
    tools:context="com.example.ns.appversion1.MapActivityFragment1"
    android:name="com.google.android.gms.maps.SupportMapFragment"/>

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:weightSum="2" >

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:gravity="left"
                android:padding="3dp"
                android:id="@+id/textRefresh"
                android:background="@drawable/border"
                android:text="Refreshing 1"
                android:textColor="#03A9FA"
                android:textSize="12sp" />


        </LinearLayout>
    </FrameLayout>
 </RelativeLayout>

我试过Charu的解决方案如下

 public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_map_activity_fragment1, null, false);

        SupportMapFragment mapFragment = (SupportMapFragment) this.getChildFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);
        tv = (TextView) getActivity().findViewById(R.id.textRefresh);
        MyCount counter = new MyCount(15000, 1000);
        counter.start();

        return view;
    }

---

这将演示从15倒计时到0（-1秒），并且每15秒将再次重复此任务

    public class YourActivity extends Activity {


    TextView textView;
    android.os.Handler customHandler;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
        textView = (TextView) findViewById(R.id.text);


        customHandler = new android.os.Handler();
        customHandler.postDelayed(updateTimerThread, 0);
    }


    // count down timer is an abstract class, so extend it and fill in methods
    public class MyCount extends CountDownTimer {

        public MyCount(long millisInFuture, long countDownInterval) {
            super(millisInFuture, countDownInterval);
        }

        @Override
        public void onFinish() {
            textView.setText("done!");
        }

        @Override
        public void onTick(long millisUntilFinished) {
            textView.setText("Left: " + millisUntilFinished / 1000);
        }
    }

    private Runnable updateTimerThread = new Runnable()
    {
        public void run()
        {

            // 10000 is the starting number (in milliseconds)
            // 1000 is the number to count down each time (in milliseconds)
            MyCount counter = new MyCount(15000, 1000);
            counter.start();
            customHandler.postDelayed(this, 15000); // repeat body after  15 seconds
        }
    };
}

只是一个建议

据我所知，处理程序在主线程上运行，所以，一旦该线程负责所有UI交互，请尝试使用轻处理任务。如果您需要处理大量数据或需要一些时间，比如等待服务器的响应，我建议您使用另一个线程，比如使用异步任务或协同路由

---

就我个人而言，我喜欢两者兼用。我使用处理程序来创建此事件，一旦到了创建时间，我就会调用在另一个线程中运行的函数来执行此操作。

您说了很多。你到底想做什么；）1.在15秒内刷新地图，或者使用倒计时？我只想在我的标签上显示倒计时，从15、14、13等一直到1，然后我调用json刷新地图？注释不用于扩展讨论；这段对话已经结束。

    public class YourActivity extends Activity {


    TextView textView;
    android.os.Handler customHandler;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
        textView = (TextView) findViewById(R.id.text);


        customHandler = new android.os.Handler();
        customHandler.postDelayed(updateTimerThread, 0);
    }


    // count down timer is an abstract class, so extend it and fill in methods
    public class MyCount extends CountDownTimer {

        public MyCount(long millisInFuture, long countDownInterval) {
            super(millisInFuture, countDownInterval);
        }

        @Override
        public void onFinish() {
            textView.setText("done!");
        }

        @Override
        public void onTick(long millisUntilFinished) {
            textView.setText("Left: " + millisUntilFinished / 1000);
        }
    }

    private Runnable updateTimerThread = new Runnable()
    {
        public void run()
        {

            // 10000 is the starting number (in milliseconds)
            // 1000 is the number to count down each time (in milliseconds)
            MyCount counter = new MyCount(15000, 1000);
            counter.start();
            customHandler.postDelayed(this, 15000); // repeat body after  15 seconds
        }
    };
}