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
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bgLayout.setOnTouchListener(this);bgLayout.setLongClickable(true); |
并且在这个函数中有如下这几句话
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public boolean onTouch(View v, MotionEvent event) {// TODO Auto-generated method stubreturn this.mGesture.onTouchEvent(event);} |
附送代码：
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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。
