[安卓] 5、SeekBar拖动条

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越来越发现这些控件用法大同小异了，这里注意几个函数：seekBar.setSecondaryProgress(0);设置初始进度为0，总共为0~99，对其监听用setOnSeekBarChangeListener。

 public class MainActivity extends Activity {
     private SeekBar seekBar;
     private TextView tv;

     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         seekBar = (SeekBar) findViewById(R.id.seekbar);
         tv = (TextView) findViewById(R.id.tv);
         seekBar.setSecondaryProgress(0);
         seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
             //当用户对拖动条的拖动的动作完成时触发
             @Override
             public void onStopTrackingTouch(SeekBar seekBar) {
                 tv.setText("<拖动条>完成拖动");
             }
             //当用户对拖动条进行拖动时触发
             @Override
             public void onStartTrackingTouch(SeekBar seekBar) {
                 tv.setText("<拖动条>拖动中...");
             }
             //当拖动条的值发生改变的时触发
             @Override
             public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                 tv.setText("当前<拖动条>的值为："+progress);
             }
         });
     }
 }

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