欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  Java

Android编程实现左右滑动切换背景的方法

程序员文章站 2022-06-11 11:55:47
...
本文实例讲述了Android编程实现左右滑动切换背景的方法。分享给大家供大家参考,具体如下:

最近想做一个左右滑动切换背景图片的应用,特地将自己的研究分享一下:

这个需要继承2个监听接口 OnGestureListener, OnTouchListener

关于这2个接口大家可以在网上查一下

同时需要设置2个属性

bgLayout.setOnTouchListener(this);
bgLayout.setLongClickable(true);

并且在这个函数中有如下这几句话

public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
return this.mGesture.onTouchEvent(event);
}

附送代码:

public class SwitcherActivity extends Activity implements OnGestureListener,
    OnTouchListener {
  /** Called when the activity is first created. */
  LinearLayout bgLayout = null;
  private GestureDetector mGesture = null;
  private int flag = 3;
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    mGesture = new GestureDetector(this);
    bgLayout = (LinearLayout) findViewById(R.id.bg);
    bgLayout.setBackgroundResource(R.drawable.bg3);
    bgLayout.setOnTouchListener(this);
    bgLayout.setLongClickable(true);
  }
  public boolean onDown(MotionEvent e) {
    // TODO Auto-generated method stub
    return false;
  }
  public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
      float velocityY) {
    // 处理左右滑动
    if (e1.getX() - e2.getX() > 100) { // 向左滑动
      if (flag == 3) {
        bgLayout.setBackgroundResource(R.drawable.bg4);
        flag = 4;
        return true;
      }
      if (flag == 4) {
        bgLayout.setBackgroundResource(R.drawable.bg5);
        flag = 5;
        return true;
      }
      if (flag == 1) {
        bgLayout.setBackgroundResource(R.drawable.bg2);
        flag = 2;
        return true;
      }
      if (flag == 2) {
        bgLayout.setBackgroundResource(R.drawable.bg3);
        flag = 3;
        return true;
      }
    } else if (e1.getX() - e2.getX() < -100) { // 向右滑动
      if (flag == 3) {
        bgLayout.setBackgroundResource(R.drawable.bg2);
        flag = 2;
        return true;
      }
      if (flag == 2) {
        bgLayout.setBackgroundResource(R.drawable.bg1);
        flag = 1;
        return true;
      }
      if (flag == 5) {
        bgLayout.setBackgroundResource(R.drawable.bg4);
        flag = 4;
        return true;
      }
      if (flag == 4) {
        bgLayout.setBackgroundResource(R.drawable.bg3);
        flag = 3;
        return true;
      }
    }
    return false;
  }
  public void onLongPress(MotionEvent e) {
    // TODO Auto-generated method stub
  }
  public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
      float distanceY) {
    // TODO Auto-generated method stub
    return false;
  }
  public void onShowPress(MotionEvent e) {
    // TODO Auto-generated method stub
  }
  public boolean onSingleTapUp(MotionEvent e) {
    // TODO Auto-generated method stub
    return false;
  }
  public boolean onTouch(View v, MotionEvent event) {
    // TODO Auto-generated method stub
    return this.mGesture.onTouchEvent(event);
  }
}

希望本文所述对大家Android程序设计有所帮助。

更多Android编程实现左右滑动切换背景的方法相关文章请关注PHP中文网!