public class HoverDemoActivity extends Activity {
  private Button btnBottom;
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    btnBottom = (Button) findViewById(R.id.btn_bottom);
    btnBottom.setOnHoverListener(new OnHoverListener() {
      @Override
      public boolean onHover(View v, MotionEvent event) {
        int what = event.getAction();
        switch(what){
         case MotionEvent.ACTION_HOVER_ENTER: //鼠标进入view
           System.out.println("bottom ACTION_HOVER_ENTER");
           break;
         case MotionEvent.ACTION_HOVER_MOVE: //鼠标在view上
           System.out.println("bottom ACTION_HOVER_MOVE");
           break;
         case MotionEvent.ACTION_HOVER_EXIT: //鼠标离开view
           System.out.println("bottom ACTION_HOVER_EXIT");
           break;
        }
        return false;
      }
    });
  }
}