Android控件SeekBar仿淘宝滑动验证效果

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public class MainActivity extends AppCompatActivity implements SeekBar.OnSeekBarChangeListener {

 private TextView tv;
 private SeekBar seekBar;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  tv = (TextView) findViewById(R.id.tv);
  seekBar = (SeekBar) findViewById(R.id.sb);
  seekBar.setOnSeekBarChangeListener(this);
 }

 /**
  * seekBar进度变化时回调
  *
  * @param seekBar 
  * @param progress 
  * @param fromUser 
  */
 @Override
 public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
  if (seekBar.getProgress() == seekBar.getMax()) {
   tv.setVisibility(View.VISIBLE);
   tv.setTextColor(Color.WHITE);
   tv.setText("完成验证");
  } else {
   tv.setVisibility(View.INVISIBLE);
  }
 }

 /**
  * seekBar开始触摸时回调
  *
  * @param seekBar
  */
 @Override
 public void onStartTrackingTouch(SeekBar seekBar) {

 }

 /**
  * seekBar停止触摸时回调
  *
  * @param seekBar
  */
 @Override
 public void onStopTrackingTouch(SeekBar seekBar) {
  if (seekBar.getProgress() != seekBar.getMax()) {
   seekBar.setProgress(0);
   tv.setVisibility(View.VISIBLE);
   tv.setTextColor(Color.GRAY);
   tv.setText("请按住滑块，拖动到最右边");
  }
 }
}