android - 如何通过移动手指来改变 Activity ？

我想寻求帮助。
你能给我一个如何通过移动手指来改变活动的建议吗。（如图所示）
谢谢你的回答
图像：https://imageshack.us/download/661/xaxrzF.png

最佳答案

您可以使用gesturedector来完成此任务，下面是工作代码，用您自己的活动替换左、右活动

public class MainActivity extends Activity {
  private GestureDetector gesture;

  @Override
  public void onCreate(Bundle savedInstanceState)
  {
    gesture = new GestureDetector(new SwipeGestureDetector());
  }


  @Override
  public boolean onTouchEvent(MotionEvent event)
  {
    if (gesture.onTouchEvent(event))
	{
      return true;
    }
    return super.onTouchEvent(event);
  }

  private void onLeft()
  {
    Intent myIntent = new Intent(MainActivity.this, LeftActivity.class);
	startActivity(myIntent);
  }

  private void onRight()
  {
    Intent myIntent = new Intent(MainActivity.this, RightActivity.class);
	startActivity(myIntent);
  }

  // Private class for gestures
  private class SwipeGestureDetector  extends SimpleOnGestureListener
	{
		private static final int SWIPE_MIN_DISTANCE = 120;
		private static final int SWIPE_MAX_OFF_PATH = 200;
		private static final int SWIPE_THRESHOLD_VELOCITY = 200;

		@Override
		public boolean onFling(MotionEvent e1, MotionEvent e2,float velocityX, float velocityY)
		{
			try
			{
				float diffAbs = Math.abs(e1.getY() - e2.getY());
				float diff = e1.getX() - e2.getX();

				if (diffAbs > SWIPE_MAX_OFF_PATH)
				return false;

				// Left swipe
				if (diff > SWIPE_MIN_DISTANCE&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY)
				{
					MainActivity.this.onLeft();
				}
				// Right swipe

				else if (-diff > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY)
				{
					MainActivity.this.onRight();
				}
			}
			catch (Exception e)
			{
				Log.e("MainActivity", "Error on gestures");
			}
			return false;
		}
	}
}