<SeekBar
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:max="100"
  android:thumb="@drawable/device_control_yellow_mid_img_40"
  android:maxHeight="8dp"
  android:progress="50"
  android:progressDrawable="@drawable/seek_style"
  android:id="@+id/id_seek_bar"
  android:layout_marginTop="100dp"
 />

public class MainActivity extends Activity implements SeekBar.OnSeekBarChangeListener{

 private int quota;//當前滑動到的值


 //我的習慣，在Activity后面implements點擊事件，然后在類中處理
 @Override
 public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
  quota=i;

 }

 @Override
 public void onStartTrackingTouch(SeekBar seekBar) {
  mTextView.setText("按下SeekBar ");

 }

 @Override
 public void onStopTrackingTouch(SeekBar seekBar) {
  mTextView.setText("松開SeekBar ");
  setSeekBar(quota);
 }

 private void setSeekBar(int i){
  if (i<33){
   mTextView2.setText("低溫");
   Drawable drawable=getResources().getDrawable(R.drawable.green_low_img_40);
   mSeekBar.setThumb(drawable);
   mSeekBar.setProgress(1);
  }else
  if (i>66){
   mTextView2.setText("高溫");
   Drawable drawable2=getResources().getDrawable(R.drawable.red_high_img_40);
   mSeekBar.setThumb(drawable2);
   mSeekBar.setProgress(99);
  }else {
   mTextView2.setText("中溫");
   Drawable drawable1=getResources().getDrawable(R.drawable.yellow_mid_img_40);
   mSeekBar.setThumb(drawable1);
   mSeekBar.setProgress(50);

  }
 }

}