android开发步步为营之61:android定时任务之Handler.postDelayed

/**
 *
 */
package com.figo.study;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

/**
 * @author figo
 *
 */
public class HandlerActivity extends Activity {
	private Button btnHandler, btnClose;
	private Handler handler;

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

		handler = new Handler();
		btnHandler = (Button) findViewById(R.id.btnHandler);
		btnClose = (Button) findViewById(R.id.btnClose);
		// 开始执行定时任务
		btnHandler.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				// 1秒后执行run
				handler.postDelayed(run, 1000);
			}
		});
		// 关闭定时任务
		btnClose.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				handler.removeCallbacks(run);
			}
		});

	}

	// 其实是运行在UI主线程
	Runnable run = new Runnable() {

		@Override
		public void run() {
			// 这里new 一个AsyncTask或者Thread执行耗时任务，否则报ANR的bug
			Toast.makeText(HandlerActivity.this, "test", Toast.LENGTH_SHORT)
					.show();
			// 每隔5秒后执行run方法
			handler.postDelayed(this, 5000);
		}
	};

}