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本文实例讲述了Android编程开发之seekBar采用handler消息处理操作的方法。分享给大家供大家参考,具体如下:
该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" > <SeekBarandroid: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; @Override protected 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() { @Override public 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(){@Override public 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); } @Override public 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):

希望本文所述对大家Android程序设计有所帮助。