Android开发（22）--seekBar采用handler消息处理操作

来源：互联网发布：javascript 常用对象编辑：程序博客网时间：2024/06/06 20:35

本案例简单实现进度条可走，可拖拽的功能，下面请看源码：

布局文件：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <SeekBar        android:id="@+id/seekBar1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_alignParentTop="true" /></RelativeLayout>

java文件：

package com.example.lession16_seekbar;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.app.Activity;import android.view.Menu;import android.widget.SeekBar;public class MainActivity extends Activity {private SeekBar seekBar;private static final int MAX_PROGRESS =100;private int current_progress=10;private static final int PRO=1;private Handler handler;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);seekBar = (SeekBar) this.findViewById(R.id.seekBar1);seekBar.setMax(MAX_PROGRESS);/*new Thread(new Runnable() {@Overridepublic void run() {while(true){try {Thread.sleep(600);current_progress+=10;seekBar.setProgress(current_progress);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}).start();*/handler = new Handler(){ @Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);switch (msg.what) {case PRO:  if(current_progress>=MAX_PROGRESS){    }else{  current_progress+=1;  seekBar.incrementProgressBy(1);    handler.sendEmptyMessageDelayed(PRO, 600);  }break;default:break;}}}; current_progress=current_progress>0?current_progress:0; seekBar.setProgress(current_progress);  handler.sendEmptyMessage(PRO);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}

效果图（自动走）：