Android定时刷新UI界面----Handler
本文转自:http://blog.csdn.net/macong01/article/details/7479266
本想做一个软件可以对UI界面进行定时更新,找了一些资料,先贴一个简单的定时更新界面程序,可以实现每隔1秒递增计数器的功能。
界面布局文件main.xml
- <?xmlversion="1.0"encoding="utf-8"?>
- <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"android:layout_width="fill_parent"
- android:layout_height="fill_parent">
- <TextViewandroid:id="@+id/counter"android:layout_width="fill_parent"
- android:layout_height="wrap_content"android:text="Count: 0"/>
- <LinearLayoutandroid:orientation="horizontal"
- android:layout_width="fill_parent"android:layout_height="wrap_content">
- <Buttonandroid:text="start"android:id="@+id/Button01"
- android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_weight="1.0"></Button>
- <Buttonandroid:text="stop"android:id="@+id/Button02"
- android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_weight="1.0"android:enabled="false"></Button>
- <Buttonandroid:text="reset"android:id="@+id/Button03"
- android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_weight="1.0"></Button>
- </LinearLayout>
- </LinearLayout>
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:id="@+id/counter" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Count: 0" /> <LinearLayout android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="wrap_content"> <Button android:text="start" android:id="@+id/Button01" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="1.0"></Button> <Button android:text="stop" android:id="@+id/Button02" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="1.0" android:enabled="false"></Button> <Button android:text="reset" android:id="@+id/Button03" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="1.0"></Button> </LinearLayout> </LinearLayout>
MyHandler.java
- package com.scnu.mc.myhandler;
- 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.TextView;
- publicclass MyHandler extends Activity {
- private Button btnStart;
- private Button btnStop;
- private Button btnReset;
- private TextView tvCounter;
- privatelong count = 0;
- privateboolean run = false;
- privatefinal Handler handler = new Handler();
- privatefinal Runnable task = new Runnable() {
- @Override
- publicvoid run() {
- // TODO Auto-generated method stub
- if (run) {
- handler.postDelayed(this, 1000);
- count++;
- }
- tvCounter.setText("Count: " + count);
- }
- };
- /** Called when the activity is first created. */
- @Override
- publicvoid 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);
- btnStart.setOnClickListener(new OnClickListener() {
- @Override
- publicvoid onClick(View v) {
- // TODO Auto-generated method stub
- run = true;
- updateButton();
- handler.postDelayed(task, 1000);
- }
- });
- btnStop.setOnClickListener(new OnClickListener() {
- @Override
- publicvoid onClick(View v) {
- // TODO Auto-generated method stub
- run = false;
- updateButton();
- handler.post(task);
- }
- });
- btnReset.setOnClickListener(new OnClickListener() {
- @Override
- publicvoid onClick(View v) {
- // TODO Auto-generated method stub
- count = 0;
- run = false;
- updateButton();
- handler.post(task);
- }
- });
- }
- privatevoid updateButton() {
- btnStart.setEnabled(!run);
- btnStop.setEnabled(run);
- }
- }
package com.scnu.mc.myhandler; 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.TextView; public class MyHandler extends Activity { private Button btnStart; private Button btnStop; private Button btnReset; private TextView tvCounter; private long count = 0; private boolean run = false; private final Handler handler = new Handler(); private final Runnable task = new Runnable() { @Override public void run() { // TODO Auto-generated method stub if (run) { handler.postDelayed(this, 1000); count++; } tvCounter.setText("Count: " + count); } }; /** 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); btnStart.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub run = true; updateButton(); handler.postDelayed(task, 1000); } }); btnStop.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub run = false; updateButton(); handler.post(task); } }); btnReset.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub count = 0; run = false; updateButton(); handler.post(task); } }); } private void updateButton() { btnStart.setEnabled(!run); btnStop.setEnabled(run); } }
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