有没有人有一个 ListActivity 在列中显示 Textviews 的简单示例，当您从左向右滑动时，您会在新视图中看到该行？这就是说编辑该行的数据或在该行上显示更详细的信息。请不要参考代码 shogun 或其他网站，因为我已经用谷歌搜索过并且没有看到这个答案。
【问题讨论】：
标签： android list textview listactivity swipe
这是我用来检测滑动的 sn-p。然后您可以使用viewflipper 更改视图。
@Override
public boolean onTouchEvent(MotionEvent event) {
if (gestureDetector.onTouchEvent(event)) {
return true;
} else {
return false;
}
}
private static final int SWIPE_MIN_DISTANCE = 30;
private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
class MyGestureDetector 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;
// right to left swipe
if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
leftFling();
} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
rightFling();
}
} catch (Exception e) {
// nothing
}
return false;
}
}
【讨论】：
我遇到了同样的问题，但在这里没有找到答案。
我想检测 ListView 项中的滑动操作并将其标记为已滑动，同时继续支持 OnItemClick 和 OnItemLongClick。
这是我的解决方案：
第一个 SwipeDetector 类：
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
public class SwipeDetector implements View.OnTouchListener {
public static enum Action {
LR, // Left to Right
RL, // Right to Left
TB, // Top to bottom
BT, // Bottom to Top
None // when no action was detected
}
private static final String logTag = "SwipeDetector";
private static final int MIN_DISTANCE = 100;
private float downX, downY, upX, upY;
private Action mSwipeDetected = Action.None;
public boolean swipeDetected() {
return mSwipeDetected != Action.None;
}
public Action getAction() {
return mSwipeDetected;
}
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
downX = event.getX();
downY = event.getY();
mSwipeDetected = Action.None;
return false; // allow other events like Click to be processed
case MotionEvent.ACTION_UP:
upX = event.getX();
upY = event.getY();
float deltaX = downX - upX;
float deltaY = downY - upY;
// horizontal swipe detection
if (Math.abs(deltaX) > MIN_DISTANCE) {
// left or right
if (deltaX < 0) {
Log.i(logTag, "Swipe Left to Right");
mSwipeDetected = Action.LR;
return false;
}
if (deltaX > 0) {
Log.i(logTag, "Swipe Right to Left");
mSwipeDetected = Action.RL;
return false;
}
} else if (Math.abs(deltaY) > MIN_DISTANCE) { // vertical swipe
// detection
// top or down
if (deltaY < 0) {
Log.i(logTag, "Swipe Top to Bottom");
mSwipeDetected = Action.TB;
return false;
}
if (deltaY > 0) {
Log.i(logTag, "Swipe Bottom to Top");
mSwipeDetected = Action.BT;
return false;
}
}
return false;
}
return false;
}
}
第二个我在列表视图中使用滑动检测器类：
final ListView lv = getListView();
final SwipeDetector swipeDetector = new SwipeDetector();
lv.setOnTouchListener(swipeDetector);
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if (swipeDetector.swipeDetected()){
// do the onSwipe action
} else {
// do the onItemClick action
}
}
});
lv.setOnItemLongClickListener(new OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view,int position, long id) {
if (swipeDetector.swipeDetected()){
// do the onSwipe action
} else {
// do the onItemLongClick action
}
}
});
这样我可以支持 3 种操作 - 滑动、单击、长按，并且我可以使用 ListView 项目信息。
稍后添加：
由于 ListView 捕捉到滚动动作，因此有时很难滑动。为了解决这个问题，我对 SwipeDetector.onTouch 进行了以下更改：
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: {
downX = event.getX();
downY = event.getY();
mSwipeDetected = Action.None;
return false; // allow other events like Click to be processed
}
case MotionEvent.ACTION_MOVE: {
upX = event.getX();
upY = event.getY();
float deltaX = downX - upX;
float deltaY = downY - upY;
// horizontal swipe detection
if (Math.abs(deltaX) > HORIZONTAL_MIN_DISTANCE) {
// left or right
if (deltaX < 0) {
Log.i(logTag, "Swipe Left to Right");
mSwipeDetected = Action.LR;
return true;
}
if (deltaX > 0) {
Log.i(logTag, "Swipe Right to Left");
mSwipeDetected = Action.RL;
return true;
}
} else
// vertical swipe detection
if (Math.abs(deltaY) > VERTICAL_MIN_DISTANCE) {
// top or down
if (deltaY < 0) {
Log.i(logTag, "Swipe Top to Bottom");
mSwipeDetected = Action.TB;
return false;
}
if (deltaY > 0) {
Log.i(logTag, "Swipe Bottom to Top");
mSwipeDetected = Action.BT;
return false;
}
}
return true;
}
}
return false;
}
【讨论】：
这是一个非常简化的版本，使用了两个监听器（onTouch 用于滑动检测，onClickIem 用于项目点击检测） 使用 isSwipe 标志停止 onClickItemListener 直到确认不是滑动
检测点击
考虑到它不是先滑动
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3)
{
if(!isSwipe)
{
adapter.increase(arg2);
adapter.notifyDataSetChanged();
}
}
});
检测滑动
listView.setOnTouchListener(new OnTouchListener() {
private int action_down_x = 0;
private int action_up_x = 0;
private int difference = 0;
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
action_down_x = (int) event.getX();
isSwipe=false; //until now
break;
case MotionEvent.ACTION_MOVE:
if(!isSwipe)
{
action_up_x = (int) event.getX();
difference = action_down_x - action_up_x;
if(Math.abs(difference)>50)
{
Log.d("action","action down x: "+action_down_x);
Log.d("action","action up x: "+action_up_x);
Log.d("action","difference: "+difference);
//swipe left or right
if(difference>0){
//swipe left
Log.d("action","swipe left");
adapter.decrease(selectedItem);
adapter.notifyDataSetChanged();
}
else{
//swipe right
Log.d("action","swipe right");
}
isSwipe=true;
}
}
break;
case MotionEvent.ACTION_UP:
Log.d("action", "ACTION_UP - ");
action_down_x = 0;
action_up_x = 0;
difference = 0;
break;
}
return false; //to allow the clicklistener to work after
}
})
【讨论】：
如果您想在滑动列表项时显示一些带有操作的按钮，互联网上的很多库都有这种行为。 我实现了我在互联网上找到的库，我非常满意。它使用起来非常简单，而且速度非常快。我改进了原始库，并为项目单击添加了一个新的单击侦听器。我还添加了 font awesome 库 (http://fortawesome.github.io/Font-Awesome/)，现在您可以简单地添加一个新项目标题并从 font awesome 指定图标名称。
Here是github链接
【讨论】：