读取seekbar的值

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 public class MainActivity extends AppCompatActivity {

     private SeekBar seekbar=null;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
         setSupportActionBar(toolbar);

         seekbar = (SeekBar) findViewById(R.id.seekbar_01);
         seekbar.setMax(100);
         seekbar.setProgress(30);
         seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
             @Override
             public void onProgressChanged(SeekBar seekbar, int progress, boolean fromUser) {
                 Log.v("拖动过程中的值：", String.valueOf(progress) + ", " + String.valueOf(fromUser));
             }

             @Override
             public void onStartTrackingTouch(SeekBar seekbar) {
                 Log.v("开始滑动时的值：", String.valueOf(seekbar.getProgress()));
             }

             @Override
             public void onStopTrackingTouch(SeekBar seekbar) {
                 Log.v("停止滑动时的值：", String.valueOf(seekbar.getProgress()));
             }
         });