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;        }    }}