Android 之高仿活动时分秒倒计时

1. 从mian.xml下手：

<LinearLayout 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"
    android:gravity="center"
    android:orientation="vertical" >

    <TextView 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="离结束时间为："/>

   <LinearLayout 
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_gravity="center"
       android:layout_marginTop="10dp"
       android:orientation="horizontal">

    <TextView
        android:id="@+id/tvtime1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:gravity="center"
        android:background="#3B3B3B"
        android:text="12"
        android:textColor="#FFFFFF"
        android:textSize="30sp" />

    <TextView
        android:id="@+id/tvtime2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
       android:layout_marginLeft="10dp"
        android:gravity="center"
        android:text="12"
        android:textColor="#FFFFFF"
        android:background="#3B3B3B"
        android:textSize="30sp" />

    <TextView
        android:id="@+id/tvtime3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
         android:layout_marginLeft="10dp"
        android:gravity="center"
        android:background="#3B3B3B"
        android:textColor="#FFFFFF"
        android:text="13"
        android:textSize="30sp" />

    LinearLayout>

LinearLayout>

1. MainActivity

public class MainActivity extends Activity {
    private TextView  tvtime1,tvtime2,tvtime3;
    private  long  time=400;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tvtime1=(TextView)findViewById(R.id.tvtime1);
        tvtime2=(TextView) findViewById(R.id.tvtime2);
        tvtime3=(TextView) findViewById(R.id.tvtime3);
        handler.postDelayed(runnable, 1000);  
    }


    Handler handler = new Handler();  
    Runnable runnable = new Runnable() {  
        @Override  
        public void run() {  
            time--;  
            String formatLongToTimeStr = formatLongToTimeStr(time);
            String[] split = formatLongToTimeStr.split("：");
            for (int i = 0; i < split.length; i++) {
                if(i==0){
                    tvtime1.setText(split[0]+"小时");
                }
                if(i==1){
                    tvtime2.setText(split[1]+"分钟");
                }
                if(i==2){
                    tvtime3.setText(split[2]+"秒");
                }

            }
            if(time>0){
                handler.postDelayed(this, 1000);  
            }
        }  
    };  

    public  String formatLongToTimeStr(Long l) {        
           int hour = 0;        
           int minute = 0;       
           int second = 0;        
           second = l.intValue() ;        
           if (second > 60) {            
            minute = second / 60;         //取整   
            second = second % 60;         //取余
           }        

           if (minute > 60) {            
            hour = minute / 60;            
            minute = minute % 60;        
           }        
           String strtime = hour+"："+minute+"："+second;
           return strtime;   

    }

}

效果图：