安卓实时显示时间

安卓开发过程中，有时候会用到实时的显示当前时间的功能，比如：自定义的状态栏就需要实时的更新当前时间，看下面图就是自定义的状态栏实时的更新时间：

实时显示更新时间代码：TimeThread.java

import android.os.Handler;
import android.os.Message;
import android.widget.TextView;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

/**
 * Copyright: Copyright (c) 2017-2025
 * Class:  实时更新时间的线程
 *
 * @author: 赵小贱
 * @date: 2017/9/13
 * describe:
 */
public class TimeThread extends Thread {
    public TextView tvDate;
    private int msgKey1 = 22;

    public TimeThread(TextView tvDate) {
        this.tvDate = tvDate;
    }

    @Override
    public void run() {
        do {
            try {
                Thread.sleep(1000);
                Message msg = new Message();
                msg.what = msgKey1;
                mHandler.sendMessage(msg);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        } while (true);
    }

    private Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
                case 22:

                    SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
                    String date = sdf.format(new Date());

                    tvDate.setText(date + getWeek());

                    break;

                default:
                    break;
            }
        }
    };

    /**
     * 获取今天星期几
     * @return
     */
    public static String getWeek() {
        Calendar cal = Calendar.getInstance();
        int i = cal.get(Calendar.DAY_OF_WEEK);
        switch (i) {
            case 1:
                return "周日";
            case 2:
                return "周一";
            case 3:
                return "周二";
            case 4:
                return "周三";
            case 5:
                return "周四";
            case 6:
                return "周五";
            case 7:
                return "周六";
            default:
                return "";
        }
    }
}

调用代码：MainActivity.java

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
/**
 * Copyright: Copyright (c) 2017-2025
 * Class:  主方法
 * @author: 赵小贱
 * @date: 2017/9/13
 * describe:
 */
public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        TextView tvDate= (TextView) findViewById(R.id.tv_date);
        //实时更新时间（1秒更新一次）
        TimeThread timeThread = new TimeThread(tvDate);//tvDate 是显示时间的控件TextView
        timeThread.start();//启动线程



    }

}

源码下载地址：http://download.csdn.net/download/zhaoxiaojian1213/9977254

安卓监听WiFi信号的变化：http://blog.csdn.net/zhaoxiaojian1213/article/details/77976504

安卓自定义电量显示图标：http://blog.csdn.net/zhaoxiaojian1213/article/details/77977505