Android-Handler使用

package com.cs.dxm.handlertest;import android.os.Bundle;import android.os.Handler;import android.support.design.widget.FloatingActionButton;import android.support.design.widget.Snackbar;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.Toolbar;import android.view.View;import android.view.Menu;import android.view.MenuItem;import android.widget.Button;public class MainActivity extends AppCompatActivity {    private Button btnStart=null;    private Button btnEnd=null;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);        setSupportActionBar(toolbar);        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);        fab.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)                        .setAction("Action", null).show();            }        });        btnStart = (Button)findViewById(R.id.btnStart);        btnStart.setOnClickListener(new StartClickListener());        btnEnd = (Button)findViewById(R.id.btnEnd);        btnEnd.setOnClickListener(new EndClickListener());    }    class StartClickListener implements View.OnClickListener{        @Override        public void onClick(View v) {            handler.post(updateThread);        }    }    class  EndClickListener implements View.OnClickListener{        @Override        public void onClick(View v) {            handler.removeCallbacks(updateThread);        }    }    Handler handler = new Handler();    Runnable updateThread = new Runnable() {        @Override        public void run() {            System.out.println("update thread");            handler.postDelayed(updateThread,3000);        }    };    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.menu_main, menu);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        // Handle action bar item clicks here. The action bar will        // automatically handle clicks on the Home/Up button, so long        // as you specify a parent activity in AndroidManifest.xml.        int id = item.getItemId();        //noinspection SimplifiableIfStatement        if (id == R.id.action_settings) {            return true;        }        return super.onOptionsItemSelected(item);    }}

/*********************************content_main.xml************************************/

<?xml version="1.0" encoding="utf-8"?>

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