Android定时任务示例-优快云博客

本文链接：https://blog.youkuaiyun.com/mars5337/article/details/5621377

本文介绍了一个简单的Android应用示例，该应用通过使用Handler和Runnable实现了基本的定时任务功能。当用户勾选CheckBox时，应用将显示一条提示信息，并在三秒后再次更新UI。

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import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.SystemClock;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.CompoundButton.OnCheckedChangeListener;

public class TestTimer extends Activity {
    private Button btnStart;
    private Button btnStop;
    private Button btnReset;
    private TextView tvCounter;

    private CheckBox cb ;

    private long count = 0;
    private boolean run = false;

    private Handler handler = new Handler();

    private Runnable task = new Runnable() {

        public void run() {
            // TODO Auto-generated method stub

            SystemClock.sleep(3000);
            Toast.makeText(TestTimer.this, "关闭打钩", Toast.LENGTH_SHORT).show();
//            handler.post(task);
        }
    };

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        btnStart = (Button) findViewById(R.id.Button01);
        btnStop = (Button) findViewById(R.id.Button02);
        btnReset = (Button) findViewById(R.id.Button03);
        tvCounter = (TextView) findViewById(R.id.counter);
        cb = (CheckBox)findViewById(R.id.cb);

        cb.setOnCheckedChangeListener(new OnCheckedChangeListener() {

   @Override
   public void onCheckedChanged(CompoundButton arg0, boolean arg1) {
    // TODO Auto-generated method stub
    if(arg1){
     Toast.makeText(TestTimer.this, "开启打钩", Toast.LENGTH_SHORT).show();

    }else{
     cb.setChecked(false);
     handler.post(task);

    }
   }
  });
    }
}

我的handler