利用handler实现定时器的两种方法

不多说，直接上 Handler两种方式第一种：package com.example.demo;import android.os.Bundle;import android.os.Handler;import android.app.Activity;import android.content.Intent;import android.view.KeyEvent;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.view.inputmethod.EditorInfo;import android.view.inputmethod.InputMethodManager;import android.widget.EditText;import android.widget.TextView;import android.widget.TextView.OnEditorActionListener;import android.widget.Toast;public class MainActivity extends Activity {private EditText editText1;TextView textView1;Handler handler = new Handler();Runnable runnable = new Runnable() {@Overridepublic void run() {handler.postDelayed(this, 2000);Toast.makeText(MainActivity.this, "YQY_Editor", Toast.LENGTH_SHORT).show();}};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);textView1 = (TextView) findViewById(R.id.textView1);textView1.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {handler.postDelayed(runnable, 2000);}});}}第二种：package com.example.demo;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.app.Activity;import android.content.Intent;import android.view.KeyEvent;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.view.inputmethod.EditorInfo;import android.view.inputmethod.InputMethodManager;import android.widget.EditText;import android.widget.TextView;import android.widget.TextView.OnEditorActionListener;import android.widget.Toast;public class MainActivity extends Activity {private EditText editText1;TextView textView1;Handler handler = new Handler(){public void handleMessage(android.os.Message msg) {switch (msg.what) {case 1:Toast.makeText(getApplicationContext(), "aaa", 3000).show();break;default:break;}};};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);textView1 = (TextView) findViewById(R.id.textView1);textView1.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {new Thread(new MyThread()).start();}});}public class MyThread implements Runnable{@Overridepublic void run() {// TODO Auto-generated method stubwhile (true) {try {Thread.sleep(3000);Message msg=new Message();msg.what=1;handler.sendMessage(msg);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}}<pre name="code" class="java">调用handler.removeCallbacks(runnable);停止线程package com.example.demo;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.view.KeyEvent;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.view.inputmethod.EditorInfo;import android.view.inputmethod.InputMethodManager;import android.widget.EditText;import android.widget.TextView;import android.widget.TextView.OnEditorActionListener;import android.widget.Toast;public class MainActivity extends Activity {private TextView editText1;static Context context;TextView textView1;Handler handler = new Handler();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);textView1 = (TextView) findViewById(R.id.textView1);editText1 = (TextView) findViewById(R.id.editText1);context = this;editText1.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubhandler.removeCallbacks(runnable);}});textView1.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {handler.post(runnable);}});}Runnable runnable = new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stubToast.makeText(context, "aaa", 3000).show();handler.postDelayed(runnable, 2000);}};}