Android控件SeekBar

Seekbar 是可拖动的进度条,用于用户实现视频和音乐快进、倒退的功能。
主要方法:
  • setMax---设置SeekBar的最大数值
  • setProgress---设置seekBar当前的数值
  • setSecondaryProgress---设置SeekBar的第二数值,即当前拖动条推荐的数值。
    
SeekBar的监听事件:
通过实现OnSeekBarChangeListener接口,需要实现3个方法:
  • 数值改变(onProgressChange)
  • 开始拖动(onStartTrackingTouch)
  • 停止拖动(onStopTrackingTouch)

自定义SeekBar进度条:
(改变进度条样式)
android: progressDrawable=“@drawable/seekbar_img”
(改变滑块的样式)
android: thumb=“@drawable/thumb”

example:
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public class MainActivity extends Activity implements OnSeekBarChangeListener{

 private SeekBar seekbar;
 private TextView tv1;
 private TextView tv2;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  seekbar = (SeekBar) findViewById(R.id.seekBar);
  seekbar.setOnSeekBarChangeListener(this);
  tv1 = (TextView) findViewById(R.id.textView1);
  tv2 = (TextView) findViewById(R.id.textView2);
 }
 //数值改变
 public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
  // TODO Auto-generated method stub
  tv2.setText("当前数值为:"+progress);
  tv1.setText("正在拖动");
 }
 //开始拖动
 public void onStartTrackingTouch(SeekBar seekBar) {
  // TODO Auto-generated method stub
  tv1.setText("开始拖动");
 }
 //停止拖动
 public void onStopTrackingTouch(SeekBar seekBar) {
  // TODO Auto-generated method stub
  tv1.setText("停止拖动");
    }
}
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//my_thumb.xml文件
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android=" http://schemas.android.com/apk/res/android" >
    <item android:drawable="@drawable/one" android:state_pressed="true"></item>
 <item android:drawable="@drawable/one" android:state_focused="true"></item>
 <item android:drawable="@drawable/one" android:state_selected="true"></item>
 <item android:drawable="@drawable/two"></item>
</selector>

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