android seekbar的用法

package com.example.test.sliderbar;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.SeekBar;
import android.widget.TextView;
import android.util.Log;

public class MainActivity extends AppCompatActivity  implements SeekBar.OnSeekBarChangeListener{
    TextView seekBarResult;
    SeekBar seekBar;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        seekBar=(SeekBar) findViewById(R.id.seekBar);
        seekBarResult=(TextView) findViewById(R.id.textView);
        seekBar.setOnSeekBarChangeListener(this);
    }

    @Override//这两个函数必须重载，尽管可以没有具体内容
    public void onStartTrackingTouch(SeekBar seekBar) {

    }
    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {

    }

    @Override
    public void onProgressChanged(SeekBar seekBar, int progress,
                                  boolean fromUser) {
        Log.d("SeekBar", "seekid:"+seekBar.getId()+", progess"+progress);
        switch(seekBar.getId()) {
            case R.id.seekBar:{
                // 设置“与系统默认SeekBar对应的TextView”的值
                seekBarResult.setText("SeekBar Value : "+String.valueOf(seekBar.getProgress()));
                break;
            }
            default:
                break;
        }
    }
}