Android入门之SeekBar（纯java）

import android.app.Activity;
import android.os.Bundle;
import android.widget.*;
import android.widget.SeekBar.OnSeekBarChangeListener;

public class SeekBarTest extends Activity {

private LinearLayout mainLayout=null;//主容器
private TextView tv=null;//文本
private SeekBar sb=null;//可拖动进度条
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mainLayout_init();
setContentView(mainLayout);
}

/*mainLayout主容器初始化*/
void mainLayout_init(){
mainLayout=new LinearLayout(this);
LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(-1,-1);
mainLayout.setLayoutParams(lp);
mainLayout.setOrientation(LinearLayout.VERTICAL);
tv_init();
mainLayout.addView(tv);
sb_init();
mainLayout.addView(sb);
}
/*tv文本初始化*/
void tv_init(){
tv=new TextView(this);
tv.setText("这里显示进度\n");
tv.append("当前选中进度：50%");
}
/*sb可拖动进度条初始化*/
void sb_init(){
sb=new SeekBar(this);
//设置进度条长度为300
LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(300, -2);
sb.setLayoutParams(lp);
//设定初始进度为50%
sb.setProgress(50);
//绑定监听
OnSeekBarChangeListener osbcl=new OnSeekBarChangeListener(){
public void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {
tv.setText("这里显示进度\n");
tv.append("当前选中进度："+progress+"%");
}
public void onStartTrackingTouch(SeekBar seekBar) {}
public void onStopTrackingTouch(SeekBar seekBar) {}
};
sb.setOnSeekBarChangeListener(osbcl);
}
}