Android_左右滑动切换背景
来源:互联网 发布:韩语网络班 编辑:程序博客网 时间:2024/05/27 21:15
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
同事需要设置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);
- }
- }
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