<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:padding="16dp">

  <SeekBar
    android:id="@+id/sb"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:max="100"
    android:progress="0"
    android:progressDrawable="@drawable/seekbar_bg"
    android:thumb="@drawable/thumb"
    android:thumbOffset="0dp" />

  <TextView
    android:id="@+id/tv"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_centerInParent="true"
    android:gravity="center"
    android:text="请按住滑块，拖动到最右边"
    android:textColor="#888888"
    android:textSize="14dp" />
</RelativeLayout>

<?xml version="1.0" encoding="UTF-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
  <!--seekBar背景-->
  <item android:id="@android:id/background">
    <!--形状-->
    <shape android:shape="rectangle">
      <!--大小-->
      <size android:height="29dp" />
      <!--圆角-->
      <corners android:radius="2dp" />
      <!--背景-->
      <solid android:color="#E7EAE9" />
      <!--边框-->
      <stroke
        android:width="1dp"
        android:color="#C3C5C4" />
    </shape>
  </item>
  <!--seekBar的进度条-->
  <item android:id="@android:id/progress">
    <clip>
      <shape>
        <corners android:radius="2dp" />
        <solid android:color="#7AC23C" />
        <stroke
          android:width="1dp"
          android:color="#C3C5C4" />
      </shape>
    </clip>
  </item>
</layer-list>

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");
    }
  }
}