Handler的使用一
//activity里面不能做耗时比较长的操作、不仅会导致runtimeException、//还会造成比较差的用户体验、需要把处理大量数据的操作放在单独的线程完成、 package com.ck;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.view.View;import android.widget.Button;public class HandlerDemoActivity extends Activity {private Button start,stop; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); findViewByIds(); start.setOnClickListener(new startOnClickListener()); stop.setOnClickListener(new stopOnClickListener()); } class startOnClickListener implements android.view.View.OnClickListener{public void onClick(View v) { //线程对象加入到执行队列handler.post(runnable);} } class stopOnClickListener implements android.view.View.OnClickListener{public void onClick(View v) {handler.removeCallbacks(runnable);} } Handler handler = new Handler(); Runnable runnable = new Runnable(){public void run() {//这里加入要做的操作System.out.println("updateThread...");handler.postDelayed(runnable, 3000);} }; void findViewByIds(){ start = (Button)findViewById(R.id.start); stop = (Button)findViewById(R.id.stop); }}