Android入门之SeekBar(纯Java)
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);
- }
- }
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