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要求:
滑动以撤消取消的代码。请帮助我实现我的要求。 Link i referred
ListviewActivity.class
package com.swipe.delete;
import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.hudomju.swipe.SwipeToDismissTouchListener;
import com.hudomju.swipe.adapter.ListViewAdapter;
import java.util.ArrayList;
import java.util.List;
import static android.widget.Toast.LENGTH_SHORT;
public class ListViewActivity extends Activity {
private static final int TIME_TO_AUTOMATICALLY_DISMISS_ITEM = 3000;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list_view_activity);
init((ListView) findViewById(R.id.list_view));
}
private void init(ListView listView) {
final MyBaseAdapter adapter = new MyBaseAdapter();
listView.setAdapter(adapter);
final SwipeToDismissTouchListener<ListViewAdapter> touchListener =
new SwipeToDismissTouchListener<>(
new ListViewAdapter(listView),
new SwipeToDismissTouchListener.DismissCallbacks<ListViewAdapter>() {
@Override
public boolean canDismiss(int position) {
return true;
}
@Override
public void onPendingDismiss(ListViewAdapter recyclerView, int position) {
}
@Override
public void onDismiss(ListViewAdapter view, int position) {
adapter.remove(position);
}
});
touchListener.setDismissDelay(TIME_TO_AUTOMATICALLY_DISMISS_ITEM);
listView.setOnTouchListener(touchListener);
// Setting this scroll listener is required to ensure that during ListView scrolling,
// we don't look for swipes.
listView.setOnScrollListener((AbsListView.OnScrollListener) touchListener.makeScrollListener());
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if (touchListener.existPendingDismisses()) {
touchListener.undoPendingDismiss();
} else {
Toast.makeText(ListViewActivity.this, "Position " + position, LENGTH_SHORT).show();
}
}
});
}
static class MyBaseAdapter extends BaseAdapter {
private static final int SIZE = 100;
private final List<String> mDataSet = new ArrayList<>();
MyBaseAdapter() {
for (int i = 0; i < SIZE; i++)
mDataSet.add(i, "This is row number " + i);
}
@Override
public int getCount() {
return mDataSet.size();
}
@Override
public String getItem(int position) {
return mDataSet.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
public void remove(int position) {
mDataSet.remove(position);
notifyDataSetChanged();
}
static class ViewHolder {
TextView dataTextView;
ViewHolder(View view) {
dataTextView = (TextView) view.findViewById(R.id.txt_data);
view.setTag(this);
}
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder = convertView == null
? new ViewHolder(convertView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.list_item, parent, false))
: (ViewHolder) convertView.getTag();
viewHolder.dataTextView.setText(mDataSet.get(position));
return convertView;
}
}
}
SwipeToDismissTouchListener.class
package com.swipe.Delete;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ValueAnimator;
import android.graphics.Rect;
import android.os.Handler;
import android.support.annotation.NonNull;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.ListView;
public class SwipeToDismissTouchListener<SomeCollectionView extends ViewAdapter> implements
View.OnTouchListener {
// Cached ViewConfiguration and system-wide constant values
private final int mSlop;
private final int mMinFlingVelocity;
private final int mMaxFlingVelocity;
private final long mAnimationTime;
// Fixed properties
private final SomeCollectionView mRecyclerView;
private final DismissCallbacks<SomeCollectionView> mCallbacks;
private int mViewWidth = 1; // 1 and not 0 to prevent dividing by zero
// Transient properties
private PendingDismissData mPendingDismiss;
private float mDownX;
private float mDownY;
private boolean mSwiping;
private int mSwipingSlop;
private VelocityTracker mVelocityTracker;
private int mDownPosition;
private RowContainer mRowContainer;
private boolean mPaused;
// Handler to dismiss pending items after a delay
private final Handler mHandler;
private final Runnable mDismissRunnable = new Runnable() {
@Override
public void run() {
processPendingDismisses();
}
};
private long mDismissDelayMillis = -1; // negative to disable automatic dismissing
public class RowContainer {
final View container;
final View dataContainer;
final View undoContainer;
boolean dataContainerHasBeenDismissed;
public RowContainer(ViewGroup container) {
this.container = container;
dataContainer = container.getChildAt(0);
undoContainer = container.getChildAt(1);
dataContainerHasBeenDismissed = false;
}
View getCurrentSwipingView() {
return dataContainerHasBeenDismissed ? undoContainer: dataContainer;
}
}
/**
* The callback interface used by {@link SwipeToDismissTouchListener} to inform its client
* about a successful dismissal of one or more list item positions.
*/
public interface DismissCallbacks<SomeCollectionView extends ViewAdapter> {
/**
* Called to determine whether the given position can be dismissed.
*/
boolean canDismiss(int position);
/**
* Called when an item is swiped away by the user and the undo layout is completely visible.
* Do NOT remove the list item yet, that should be done in { #onDismiss(com.hudomju.swipe.adapter.ViewAdapter, int)}
* This may also be called immediately before and item is completely dismissed.
*
* @param recyclerView The originating {android.support.v7.widget.RecyclerView}.
* @param position The position of the dismissed item.
*/
void onPendingDismiss(SomeCollectionView recyclerView, int position);
/**
* Called when the item is completely dismissed and removed from the list, after the undo layout is hidden.
*
* @param recyclerView The originating { android.support.v7.widget.RecyclerView}.
* @param position The position of the dismissed item.
*/
void onDismiss(SomeCollectionView recyclerView, int position);
}
/**
* Constructs a new swipe-to-dismiss touch listener for the given list view.
*
* @param recyclerView The list view whose items should be dismissable.
* @param callbacks The callback to trigger when the user has indicated that she would like to
* dismiss one or more list items.
*/
public SwipeToDismissTouchListener(SomeCollectionView recyclerView,
DismissCallbacks<SomeCollectionView> callbacks) {
ViewConfiguration vc = ViewConfiguration.get(recyclerView.getContext());
mSlop = vc.getScaledTouchSlop();
mMinFlingVelocity = vc.getScaledMinimumFlingVelocity() * 16;
mMaxFlingVelocity = vc.getScaledMaximumFlingVelocity();
mAnimationTime = recyclerView.getContext().getResources().getInteger(
android.R.integer.config_shortAnimTime);
mRecyclerView = recyclerView;
mCallbacks = callbacks;
mHandler = new Handler();
}
/**
* Enables or disables (pauses or resumes) watching for swipe-to-dismiss gestures.
*
* @param enabled Whether or not to watch for gestures.
*/
public void setEnabled(boolean enabled) {
mPaused = !enabled;
}
/**
* Set the delay after which the pending items will be dismissed when there was no user action.
* Set to a negative value to disable automatic dismissing items.
* @param dismissDelayMillis The delay between onPendingDismiss and onDismiss calls, in milliseconds.
*/
public void setDismissDelay(long dismissDelayMillis) {
this.mDismissDelayMillis = dismissDelayMillis;
}
/**
* Returns an {@link AbsListView.OnScrollListener} to be added to the {@link
* ListView} using {@link ListView#setOnScrollListener(AbsListView.OnScrollListener)}.
* If a scroll listener is already assigned, the caller should still pass scroll changes through
* to this listener. This will ensure that this {@link SwipeToDismissTouchListener} is
* paused during list view scrolling.</p>
*
* @see SwipeToDismissTouchListener
*/
public Object makeScrollListener() {
return mRecyclerView.makeScrollListener(new AbsListView.OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView absListView, int scrollState) {
processPendingDismisses();
setEnabled(scrollState != AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL);
}
@Override
public void onScroll(AbsListView absListView, int i, int i1, int i2) {
}
});
}
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
if (mViewWidth < 2) {
mViewWidth = mRecyclerView.getWidth();
}
switch (motionEvent.getActionMasked()) {
case MotionEvent.ACTION_DOWN: {
if (mPaused) {
return false;
}
// TODO: ensure this is a finger, and set a flag
// Find the child view that was touched (perform a hit test)
Rect rect = new Rect();
int childCount = mRecyclerView.getChildCount();
int[] listViewCoords = new int[2];
mRecyclerView.getLocationOnScreen(listViewCoords);
int x = (int) motionEvent.getRawX() - listViewCoords[0];
int y = (int) motionEvent.getRawY() - listViewCoords[1];
View child;
for (int i = 0; i < childCount; i++) {
child = mRecyclerView.getChildAt(i);
child.getHitRect(rect);
if (rect.contains(x, y)) {
assert child instanceof ViewGroup &&
((ViewGroup) child).getChildCount() == 2 :
"Each child needs to extend from ViewGroup and have two children";
boolean dataContainerHasBeenDismissed = mPendingDismiss != null &&
mPendingDismiss.position == mRecyclerView.getChildPosition(child) &&
mPendingDismiss.rowContainer.dataContainerHasBeenDismissed;
mRowContainer = new RowContainer((ViewGroup) child);
mRowContainer.dataContainerHasBeenDismissed = dataContainerHasBeenDismissed;
break;
}
}
if (mRowContainer != null) {
mDownX = motionEvent.getRawX();
mDownY = motionEvent.getRawY();
mDownPosition = mRecyclerView.getChildPosition(mRowContainer.container);
if (mCallbacks.canDismiss(mDownPosition)) {
mVelocityTracker = VelocityTracker.obtain();
mVelocityTracker.addMovement(motionEvent);
} else {
mRowContainer = null;
}
}
return false;
}
case MotionEvent.ACTION_CANCEL: {
if (mVelocityTracker == null) {
break;
}
if (mRowContainer != null && mSwiping) {
// cancel
mRowContainer.getCurrentSwipingView()
.animate()
.translationX(0)
.alpha(1)
.setDuration(mAnimationTime)
.setListener(null);
}
mVelocityTracker.recycle();
mVelocityTracker = null;
mDownX = 0;
mDownY = 0;
mRowContainer = null;
mDownPosition = ListView.INVALID_POSITION;
mSwiping = false;
break;
}
case MotionEvent.ACTION_UP: {
if (mVelocityTracker == null) {
break;
}
float deltaX = motionEvent.getRawX() - mDownX;
mVelocityTracker.addMovement(motionEvent);
mVelocityTracker.computeCurrentVelocity(1000);
float velocityX = mVelocityTracker.getXVelocity();
float absVelocityX = Math.abs(velocityX);
float absVelocityY = Math.abs(mVelocityTracker.getYVelocity());
boolean dismiss = false;
boolean dismissRight = false;
if (Math.abs(deltaX) > mViewWidth / 2 && mSwiping) {
dismiss = true;
dismissRight = deltaX > 0;
} else if (mMinFlingVelocity <= absVelocityX && absVelocityX <= mMaxFlingVelocity
&& absVelocityY < absVelocityX && mSwiping) {
// dismiss only if flinging in the same direction as dragging
dismiss = (velocityX < 0) == (deltaX < 0);
dismissRight = mVelocityTracker.getXVelocity() > 0;
}
if (dismiss && mDownPosition != ListView.INVALID_POSITION) {
// dismiss
final RowContainer downView = mRowContainer; // mDownView gets null'd before animation ends
final int downPosition = mDownPosition;
mRowContainer.getCurrentSwipingView()
.animate()
.translationX(dismissRight ? mViewWidth : -mViewWidth)
.alpha(0)
.setDuration(mAnimationTime)
.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
performDismiss(downView, downPosition);
}
});
} else {
// cancel
mRowContainer.getCurrentSwipingView()
.animate()
.translationX(0)
.alpha(1)
.setDuration(mAnimationTime)
.setListener(null);
}
mVelocityTracker.recycle();
mVelocityTracker = null;
mDownX = 0;
mDownY = 0;
mRowContainer = null;
mDownPosition = ListView.INVALID_POSITION;
mSwiping = false;
break;
}
case MotionEvent.ACTION_MOVE: {
if (mVelocityTracker == null || mPaused) {
break;
}
mVelocityTracker.addMovement(motionEvent);
float deltaX = motionEvent.getRawX() - mDownX;
float deltaY = motionEvent.getRawY() - mDownY;
if (Math.abs(deltaX) > mSlop && Math.abs(deltaY) < Math.abs(deltaX) / 2) {
mSwiping = true;
mSwipingSlop = deltaX > 0 ? mSlop : -mSlop;
mRecyclerView.requestDisallowInterceptTouchEvent(true);
// Cancel ListView's touch (un-highlighting the item)
MotionEvent cancelEvent = MotionEvent.obtain(motionEvent);
cancelEvent.setAction(MotionEvent.ACTION_CANCEL |
(motionEvent.getActionIndex()
<< MotionEvent.ACTION_POINTER_INDEX_SHIFT));
mRecyclerView.onTouchEvent(cancelEvent);
cancelEvent.recycle();
}
if (mSwiping) {
mRowContainer.getCurrentSwipingView().setTranslationX(deltaX - mSwipingSlop);
mRowContainer.getCurrentSwipingView().setAlpha(Math.max(0f, Math.min(1f,
1f - 2f * Math.abs(deltaX) / mViewWidth)));
return true;
}
break;
}
}
return false;
}
class PendingDismissData implements Comparable<PendingDismissData> {
public int position;
public RowContainer rowContainer;
public PendingDismissData(int position, RowContainer rowContainer) {
this.position = position;
this.rowContainer= rowContainer;
}
@Override
public int compareTo(@NonNull PendingDismissData other) {
// Sort by descending position
return other.position - position;
}
}
private void performDismiss(RowContainer dismissView, int dismissPosition) {
// Animate the dismissed list item to zero-height and fire the dismiss callback when
// all dismissed list item animations have completed. This triggers layout on each animation
// frame; in the future we may want to do something smarter and more performant.
if (mPendingDismiss != null) {
boolean dismissingDifferentRow = mPendingDismiss.position != dismissPosition;
int newPosition = mPendingDismiss.position < dismissPosition ? dismissPosition-1 : dismissPosition;
processPendingDismisses();
if (dismissingDifferentRow) {
addPendingDismiss(dismissView, newPosition);
}
} else {
addPendingDismiss(dismissView, dismissPosition);
}
}
private void addPendingDismiss(RowContainer dismissView, int dismissPosition) {
dismissView.dataContainerHasBeenDismissed = true;
dismissView.undoContainer.setVisibility(View.VISIBLE);
mPendingDismiss = new PendingDismissData(dismissPosition, dismissView);
// Notify the callbacks
mCallbacks.onPendingDismiss(mRecyclerView, dismissPosition);
// Automatically dismiss the item after a certain delay
if(mDismissDelayMillis >= 0)
mHandler.removeCallbacks(mDismissRunnable);
mHandler.postDelayed(mDismissRunnable, mDismissDelayMillis);
}
/**
* If a view was dismissed and the undo container is showing it will proceed with the final
* dismiss of the item.
* @return whether there were any pending rows to be dismissed.
*/
public boolean processPendingDismisses() {
boolean existPendingDismisses = existPendingDismisses();
if (existPendingDismisses) processPendingDismisses(mPendingDismiss);
return existPendingDismisses;
}
/**
* Whether a row has been dismissed and is waiting for confirmation
* @return whether there are any pending rows to be dismissed.
*/
public boolean existPendingDismisses() {
return mPendingDismiss != null && mPendingDismiss.rowContainer.dataContainerHasBeenDismissed;
}
/**
* If a view was dismissed and the undo container is showing it will undo and make the data
* container reappear.
* @return whether there were any pending rows to be dismissed.
*/
public boolean undoPendingDismiss() {
boolean existPendingDismisses = existPendingDismisses();
if (existPendingDismisses) {
mPendingDismiss.rowContainer.undoContainer.setVisibility(View.GONE);
mPendingDismiss.rowContainer.dataContainer
.animate()
.translationX(0)
.alpha(1)
.setDuration(mAnimationTime)
.setListener(null);
mPendingDismiss = null;
}
return existPendingDismisses;
}
private void processPendingDismisses(final PendingDismissData pendingDismissData) {
mPendingDismiss = null;
final ViewGroup.LayoutParams lp = pendingDismissData.rowContainer.container.getLayoutParams();
final int originalHeight = pendingDismissData.rowContainer.container.getHeight();
ValueAnimator animator = ValueAnimator.ofInt(originalHeight, 1).setDuration(mAnimationTime);
animator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
if (mCallbacks.canDismiss(pendingDismissData.position))
mCallbacks.onDismiss(mRecyclerView, pendingDismissData.position);
pendingDismissData.rowContainer.dataContainer.post(new Runnable() {
@Override
public void run() {
pendingDismissData.rowContainer.dataContainer.setTranslationX(0);
pendingDismissData.rowContainer.dataContainer.setAlpha(1);
pendingDismissData.rowContainer.undoContainer.setVisibility(View.GONE);
pendingDismissData.rowContainer.undoContainer.setTranslationX(0);
pendingDismissData.rowContainer.undoContainer.setAlpha(1);
lp.height = originalHeight;
pendingDismissData.rowContainer.container.setLayoutParams(lp);
}
});
}
});
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
lp.height = (Integer) valueAnimator.getAnimatedValue();
pendingDismissData.rowContainer.container.setLayoutParams(lp);
}
});
animator.start();
}
}
最佳答案
我已经更新并评论了您的代码以实现您想要的。首先检查 MyBaseAdapter()
构造函数,然后检查 getView()
方法。
Package com.swipe.delete;
import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.hudomju.swipe.SwipeToDismissTouchListener;
import com.hudomju.swipe.adapter.ListViewAdapter;
import java.util.ArrayList;
import java.util.List;
import static android.widget.Toast.LENGTH_SHORT;
public class ListViewActivity extends Activity {
private static final int TIME_TO_AUTOMATICALLY_DISMISS_ITEM = 3000;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list_view_activity);
init((ListView) findViewById(R.id.list_view));
}
private void init(ListView listView) {
final MyBaseAdapter adapter = new MyBaseAdapter();
listView.setAdapter(adapter);
final SwipeToDismissTouchListener<ListViewAdapter> touchListener =
new SwipeToDismissTouchListener<>(
new ListViewAdapter(listView),
new SwipeToDismissTouchListener.DismissCallbacks<ListViewAdapter>() {
@Override
public boolean canDismiss(int position) {
return true;
}
@Override
public void onPendingDismiss(ListViewAdapter recyclerView, int position) {
}
@Override
public void onDismiss(ListViewAdapter view, int position) {
adapter.remove(position);
}
});
touchListener.setDismissDelay(TIME_TO_AUTOMATICALLY_DISMISS_ITEM);
listView.setOnTouchListener(touchListener);
// Setting this scroll listener is required to ensure that during ListView scrolling,
// we don't look for swipes.
listView.setOnScrollListener((AbsListView.OnScrollListener) touchListener.makeScrollListener());
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if (touchListener.existPendingDismisses()) {
touchListener.undoPendingDismiss();
} else {
Toast.makeText(ListViewActivity.this, "Position " + position, LENGTH_SHORT).show();
}
}
});
}
static class MyBaseAdapter extends BaseAdapter {
private static final int SIZE = 100;
private final List<String> mDataSet = new ArrayList<>();
MyBaseAdapter() {
for (int i = 0; i < 5; i++){
// You should add an object containing type of view like section or sectionHeader along with your string.
// Here i am just using string search to detect whether it is sectionHeader or section. have a look at getView() Method
mDataSet.add("This is Section Header " + i);
for (int e = 0; e < SIZE; i++){
mDataSet.add(i, "This is section " + e);
}
}
}
@Override
public int getCount() {
return mDataSet.size();
}
@Override
public String getItem(int position) {
return mDataSet.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
public void remove(int position) {
mDataSet.remove(position);
notifyDataSetChanged();
}
static class ViewHolder {
TextView dataTextView;
ViewHolder(View view) {
dataTextView = (TextView) view.findViewById(R.id.txt_data);
view.setTag(this);
}
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder = convertView == null
? new ViewHolder(convertView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.list_item, parent, false))
: (ViewHolder) convertView.getTag();
viewHolder.dataTextView.setText(mDataSet.get(position));
if(mDataSet.get(position).indexof("Section Header") != -1){
// This is your sectionHeader
// Customize you sectionHeader UI here
// Ideally you should use object here so (object.type == 1) can determine whether this is a sectionHeader or header
}else{
// This is your section
// Customize you section UI here
}
return convertView;
}
}
}
希望对你有帮助。
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我有一个工作正常的 DropdownMenu,但我需要一个 ListView,但我无法转换它。 DropdownMenu 如下所示: // Create the List of devices t
我想实现一个可滚动(垂直)且其中包含元素的屏幕。所以我把它放在 listview.builder 上。问题是,其中一个元素是另一个水平滚动的 listview.builder。当我实现它时,horiz
帮助!我想不通! 为了帮助我学习 SwiftUI,我正在使用 ListView 制作一个简单的杂货 list 应用程序。点击列表中的每个项目时,有些按钮会变成绿色或红色。 在我向列表数组中添加太多项目
所以我知道我们可以等待 ListView 加载,然后显示它。但是,如果我们动态加载正在下载的图像,ListView 将加载但图像尚未加载,因此它们不会出现在 ListView 中。 可接受的等待 Li
我是 Android 的新手,正在努力提高编程技能。 在这里,我有自定义 ListView 适配器类,我曾在其中显示 ListView 项目,如 TextView 、图像等。 我需要做的是,我在 Li
So, what I want is to individually disable a button for the concerned item in the ListView when clic
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