Android 安卓-刷卡手势有问题
我正在尝试在我的应用程序中实现刷卡手势。我已经编写了几乎所有的代码,但都不起作用 以下是我活动中的代码:Android 安卓-刷卡手势有问题,android,gesture,swipe,onfling,Android,Gesture,Swipe,Onfling,我正在尝试在我的应用程序中实现刷卡手势。我已经编写了几乎所有的代码,但都不起作用 以下是我活动中的代码: // Swipe detector gestureDetector = new GestureDetector(new SwipeGesture(this)); gestureListener = new OnTouchListener() { public boolean onTouch(View v, MotionEvent event) { Log.e(
// Swipe detector
gestureDetector = new GestureDetector(new SwipeGesture(this));
gestureListener = new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event)
{
Log.e("", "It works");
return gestureDetector.onTouchEvent(event);
}
};
LinearLayout root = (LinearLayout) findViewById(R.id.rules_root);
root.setOnTouchListener(gestureListener);
当我触摸屏幕时,logcat显示它工作
在这里,他输入了类的代码swipgesture
:
public class SwipeGesture extends SimpleOnGestureListener
{
private static final int SWIPE_MIN_DISTANCE = 120;
private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
private Activity activity;
public SwipeGesture(Activity activity)
{
super();
this.activity = activity;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
{
Log.e("", "Here I am");
try
{
if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH) return false;
if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY)
{
if ( ((TabActivity) activity.getParent()).getTabHost() != null )
{
TabHost th = ((TabActivity) activity.getParent()).getTabHost();
th.setCurrentTab(th.getCurrentTab() - 1);
}
else
{
activity.finish();
}
Log.e("", "Swipe left");
}
else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY)
{
if ( ((TabActivity) activity.getParent()).getTabHost() != null )
{
TabHost th = ((TabActivity) activity.getParent()).getTabHost();
th.setCurrentTab(th.getCurrentTab() + 1);
}
Log.e("", "Swipe right");
}
}
catch (Exception e)
{
e.printStackTrace();
}
return false;
}
}
行Log.e(“,“我在这里”)代码>从不显示。所以我认为onFling方法从未被调用过
你知道为什么这样不行吗
谢谢
问候
V.你需要改变一些事情,下面是一个例子
设置您的OnTouchListener:
root.setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
if (gestureDetector.onTouchEvent(event)) {
return false;
}
return false;
}
});
class SwipeGesture extends SimpleOnGestureListener {
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
try {
if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
return false;
if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
//Do something
return true;
} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
//Do something
return true;
}
} catch (Exception e) {
Log.e("Fling", "There was an error processing the Fling event:"
+ e.getMessage());
}
return true;
}
// Necessary for the onFling event to register
@Override
public boolean onDown(MotionEvent e) {
return true;
}
}
SwipeGesture类:
root.setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
if (gestureDetector.onTouchEvent(event)) {
return false;
}
return false;
}
});
class SwipeGesture extends SimpleOnGestureListener {
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
try {
if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
return false;
if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
//Do something
return true;
} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
//Do something
return true;
}
} catch (Exception e) {
Log.e("Fling", "There was an error processing the Fling event:"
+ e.getMessage());
}
return true;
}
// Necessary for the onFling event to register
@Override
public boolean onDown(MotionEvent e) {
return true;
}
}
看起来您正在选项卡之间滑动。使用Fragments
和ViewPager
对用户来说更容易、更流畅。在SimpleNogestureListener中,覆盖onDown以注册手势。它可以返回true,但必须这样定义
@Override
public boolean onDown(MotionEvent e) {
return true;
}
…Ohhh伙计,我差不多两个小时都在处理同一个问题,+1感谢你的客观性