Android 自动刷新和倒计时刷新实现

Handler与Runnable实现间隔刷新，隔5s刷新一次；

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.widget.TextView;

public class refreshActivity extends Activity {
    public String TAG = "LOG";
    private TextView vtockenstr;
    String strtoken;
    Context context;
    Refreshpage resh = new Refreshpage();

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.srtoken);
        context = this;
        vtockenstr = (TextView) findViewById(R.id.tokenstr);
        vtockenstr.setText(strtoken);
        resh.handler.postDelayed(resh.runnable, 10000);// 每兩秒執行一次runnable.
    }

    @Override
    public void onResume() {
        // 回到Activity的时候重新开始刷新；
        super.onResume();
        resh.handler.postDelayed(resh.runnable, 10000);
    }

    @Override
    public void onPause() {
        // 离开Activity的时候停止刷新；
        super.onPause();
        resh.handler.removeCallbacks(resh.runnable);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        resh.handler.removeCallbacks(resh.runnable);
    }

    class Refreshpage {
        Handler handler = new Handler();
        Runnable runnable = new Runnable() {
            @Override
            public void run() {
                // 要做的事情
                vtockenstr.setText(strtoken);
                handler.postDelayed(this, 10000);
            }
        };
    }

}

 CountDownTimer实现倒计时刷新，隔5分钟刷新一次；这里要注意的是Activity的生命周期问题，必须在onPause()和onResume() 方法里面停止和恢复进程，避免不必要的开销

import java.text.SimpleDateFormat;
import java.util.Date;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class SRTokenActivity extends Activity {
    public String TAG = "LOG";
    private Button fixback;
    TextView tt;
    private TextView vtockenstr;
    String strtoken ;
    Context context;
    Date date;
    MyCount myCount;
    int minute,second,micount,allcount;
    String time;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        Log.e(TAG, "start onCreate~~~"+time+"&"+allcount); 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.srtoken);
        context = this;
        SharedPreferences sp = context.getSharedPreferences("serverparam",
                MODE_PRIVATE); // 获得Preferences
        vtockenstr = (TextView)findViewById(R.id.tokenstr);
        vtockenstr.setText(strtoken);
        tt = (TextView)findViewById(R.id.countdowntime);
        fixback = (Button)findViewById(R.id.fixback);
        fixback.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View v) {
                SRTokenActivity.this.finish();
            }
        });
        vtockenstr.setText(strtoken);
        newtime();
        myCount.start();
        }
    
    //5分钟刷新一次，计算剩下的间隔时间
    public void newtime(){
        date = new Date(System.currentTimeMillis());
        SimpleDateFormat sdf = new SimpleDateFormat("MMddHHmmss");
        time = sdf.format(date) ;
        minute = Integer.parseInt(time.substring(6,8));
        second = Integer.parseInt(time.substring(8,10));
        allcount = (4-minute%5)*60+(60-second);
        myCount = new MyCount(allcount*1000,1000);
        System.out.println("time:"+time);
    }
    
    
    //记录生命周期
    @Override  
    protected void onStart() {  
        super.onStart();  
        Log.e(TAG, "start onStart~~~"+time+"&"+allcount);  
    }  
    @Override  
    protected void onRestart() {  
        super.onRestart();  
        Log.e(TAG, "start onRestart~~~"+time+"&"+allcount); 
    }  
    @Override  
    protected void onResume() {  
        super.onResume();  
        Log.e(TAG, "start onResume~~~"+time+"&"+allcount); 
    }  
    @Override  
    protected void onPause() {  
        super.onPause();  
        Log.e(TAG, "start onPause~~~"+time+"&"+allcount); 
    }  
    @Override  
    protected void onStop() {  
        super.onStop();  
        Log.e(TAG, "start onStop~~~"+time+"&"+allcount); 
    }  
    @Override  
    protected void onDestroy() {  
        super.onDestroy();  
        Log.e(TAG, "start onDestroy~~~"+time+"&"+allcount); 
        myCount.cancel();
    }  
  
    class MyCount extends CountDownTimer {
        public MyCount(long millisInFuture, long countDownInterval) {
            super(millisInFuture, countDownInterval);
        }
        @Override
        public void onFinish() {
            vtockenstr.setText(strtoken);
            newtime();
            myCount.start();
        }
        @Override
        public void onTick(long millisUntilFinished) {
            tt.setText("(" + millisUntilFinished / 1000 + ")秒后刷新...");
        }
        
    }
    
}

【转载】

Android实现计时与倒计时的几种方法

http://blog.csdn.net/ithomer/article/details/6903084

CountDownTimer 实现倒计时

http://blog.csdn.net/yuanjh2001/article/details/6075315

其他例子

http://www.open-open.com/lib/view/open1343782266665.html

http://blog.csdn.net/chrp99/article/details/9169859