Android开发之seekBar采用handler消息处理操作的方法

释放双眼,带上耳机,听听看~!

 

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" >
<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;
@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 block
e.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):

 

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