如何通過在Android中刷不同的ListView項目來啟動活動？

Question

我正在開發一個應用程序，我需要一個ListView像Samsung Galaxy S的contact ListView

我可以在Android的幫助下實現滑動功能-像三星聯系ListView帖子一樣向左/向右滑動ListView幻燈片 。

滑動不同的listview項時，我需要啟動不同的活動。 誰能幫助我？ 任何幫助表示贊賞。

這是我的列表視圖活動。

public class HomeActivity extends Activity {
ListView listView ;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.home_listview);

    // Get ListView object from xml
    listView = (ListView) findViewById(R.id.list);

    // Defined Array values to show in ListView
    String[] values = new String[] { "Android List View",
            "Adapter implementation",
            "Simple List View In Android",
            "Create List View Android",
            "Android Example",
            "List View Source Code",
            "List View Array Adapter",
            "Android Example List View"
    };

    // Define a new Adapter
    // First parameter - Context
    // Second parameter - Layout for the row
    // Third parameter - ID of the TextView to which the data is written
    // Forth - the Array of data

    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, android.R.id.text1, values);


    // Assign adapter to ListView
    listView.setAdapter(adapter);



    // Create a ListView-specific touch listener. ListViews are given special treatment because by default they handle touches for their list items... i.e. they're in charge of drawing
   // the pressed state (the list selector), handling list item clicks, etc.
    SwipeListViewTouchListener touchListener =
            new SwipeListViewTouchListener(
                    listView,
                    new SwipeListViewTouchListener.OnSwipeCallback() {
                        @Override
                        public void onSwipeLeft(ListView listView, int [] reverseSortedPositions) {
                            //  Log.i(this.getClass().getName(), "swipe left : pos="+reverseSortedPositions[0]);
                            // TODO : YOUR CODE HERE FOR LEFT ACTION
                        }

                        @Override
                        public void onSwipeRight(ListView listView, int [] reverseSortedPositions) {
                            //  Log.i(ProfileMenuActivity.class.getClass().getName(), "swipe right : pos="+reverseSortedPositions[0]);
                            // TODO : YOUR CODE HERE FOR RIGHT ACTION

                        }
                    },
                    true, // example : left action = dismiss
                    false); // example : right action without dismiss animation
    listView.setOnTouchListener(touchListener);
// Setting this scroll listener is required to ensure that during ListView scrolling,
// we don't look for swipes.
    listView.setOnScrollListener(touchListener.makeScrollListener());
}}

這是我的SwipeListViewTouchListener類。

public class SwipeListViewTouchListener implements View.OnTouchListener {
// Cached ViewConfiguration and system-wide constant values
private int mSlop;
private int mMinFlingVelocity;
private int mMaxFlingVelocity;
private long mAnimationTime;

// Fixed properties
private ListView mListView;
private OnSwipeCallback mCallback;
private int mViewWidth = 1; // 1 and not 0 to prevent dividing by zero
private boolean dismissLeft = true;
private boolean dismissRight = true;

// Transient properties
private List< PendingSwipeData > mPendingSwipes = new ArrayList< PendingSwipeData >();
private int mDismissAnimationRefCount = 0;
private float mDownX;
private boolean mSwiping;
private VelocityTracker mVelocityTracker;
private int mDownPosition;
private View mDownView;
private boolean mPaused;

/**
 * The callback interface used by {@link SwipeListViewTouchListener} to inform its client
 * about a successful swipe of one or more list item positions.
 */
public interface OnSwipeCallback {
    /**
     * Called when the user has swiped the list item to the left.
     *
     * @param listView               The originating {@link ListView}.
     * @param reverseSortedPositions An array of positions to dismiss, sorted in descending
     *                               order for convenience.
     */
    void onSwipeLeft(ListView listView, int[] reverseSortedPositions);

    void onSwipeRight(ListView listView, int[] reverseSortedPositions);
}

/**
 * Constructs a new swipe-to-action touch listener for the given list view.
 *
 * @param listView The list view whose items should be dismissable.
 * @param callback The callback to trigger when the user has indicated that she would like to
 *                 dismiss one or more list items.
 */
public SwipeListViewTouchListener(ListView listView, OnSwipeCallback callback) {
    ViewConfiguration vc = ViewConfiguration.get(listView.getContext());
    mSlop = vc.getScaledTouchSlop();
    mMinFlingVelocity = vc.getScaledMinimumFlingVelocity();
    mMaxFlingVelocity = vc.getScaledMaximumFlingVelocity();
    mAnimationTime = listView.getContext().getResources().getInteger(
            android.R.integer.config_shortAnimTime);
    mListView = listView;
    mCallback = callback;
}

/**
 * Constructs a new swipe-to-action touch listener for the given list view.
 *
 * @param listView The list view whose items should be dismissable.
 * @param callback The callback to trigger when the user has indicated that she would like to
 *                 dismiss one or more list items.
 * @param dismissLeft set if the dismiss animation is up when the user swipe to the left
 * @param dismissRight set if the dismiss animation is up when the user swipe to the right
 * @see #SwipeListViewTouchListener(ListView, OnSwipeCallback, boolean, boolean)
 */
public SwipeListViewTouchListener(ListView listView, OnSwipeCallback callback, boolean dismissLeft, boolean dismissRight) {
    this(listView, callback);
    this.dismissLeft = dismissLeft;
    this.dismissRight = dismissRight;
}

/**
 * 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;
}

/**
 * Returns an {@link android.widget.AbsListView.OnScrollListener} to be added to the
 * {@link ListView} using
 * {@link ListView#setOnScrollListener(android.widget.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 SwipeListViewTouchListener} is paused during list view scrolling.</p>
 *
 * @see {@link SwipeListViewTouchListener}
 */
public AbsListView.OnScrollListener makeScrollListener() {
    return new AbsListView.OnScrollListener() {@
                                                       Override
                                               public void onScrollStateChanged(AbsListView absListView, int scrollState) {
        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 = mListView.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 = mListView.getChildCount();
            int[] listViewCoords = new int[2];
            mListView.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 = mListView.getChildAt(i);
                child.getHitRect(rect);
                if (rect.contains(x, y)) {
                    mDownView = child;
                    break;
                }
            }

            if (mDownView != null) {
                mDownX = motionEvent.getRawX();
                mDownPosition = mListView.getPositionForView(mDownView);

                mVelocityTracker = VelocityTracker.obtain();
                mVelocityTracker.addMovement(motionEvent);
            }
            view.onTouchEvent(motionEvent);
            return true;
        }

        case MotionEvent.ACTION_UP:
        {
            if (mVelocityTracker == null) {
                break;
            }

            float deltaX = motionEvent.getRawX() - mDownX;
            mVelocityTracker.addMovement(motionEvent);
            mVelocityTracker.computeCurrentVelocity(500); // 1000 by defaut but it was too much
            float velocityX = Math.abs(mVelocityTracker.getXVelocity());
            float velocityY = Math.abs(mVelocityTracker.getYVelocity());
            boolean swipe = false;
            boolean swipeRight = false;

            if (Math.abs(deltaX) > mViewWidth / 2) {
                swipe = true;
                swipeRight = deltaX > 0;
            } else if (mMinFlingVelocity <= velocityX && velocityX <= mMaxFlingVelocity && velocityY < velocityX) {
                swipe = true;
                swipeRight = mVelocityTracker.getXVelocity() > 0;
            }
            if (swipe) {
                // sufficent swipe value
                final View downView = mDownView; // mDownView gets null'd before animation ends
                final int downPosition = mDownPosition;
                final boolean toTheRight = swipeRight;
                ++mDismissAnimationRefCount;
                mDownView.animate()
                        .translationX(swipeRight ? mViewWidth : -mViewWidth)
                        .alpha(0)
                        .setDuration(mAnimationTime)
                        .setListener(new AnimatorListenerAdapter() {@
                                                                            Override
                                                                    public void onAnimationEnd(Animator animation) {
                            performSwipeAction(downView, downPosition, toTheRight, toTheRight ? dismissRight : dismissLeft);
                        }
                        });
            } else {
                // cancel
                mDownView.animate()
                        .translationX(0)
                        .alpha(1)
                        .setDuration(mAnimationTime)
                        .setListener(null);
            }
            mVelocityTracker = null;
            mDownX = 0;
            mDownView = 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;
            if (Math.abs(deltaX) > mSlop) {
                mSwiping = true;
                mListView.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));
                mListView.onTouchEvent(cancelEvent);
            }

            if (mSwiping) {
                mDownView.setTranslationX(deltaX);
                mDownView.setAlpha(Math.max(0f, Math.min(1f,
                        1f - 2f * Math.abs(deltaX) / mViewWidth)));
                return true;
            }
            break;
        }
    }

    return false;
}

class PendingSwipeData implements Comparable < PendingSwipeData > {
    public int position;
    public View view;

    public PendingSwipeData(int position, View view) {
        this.position = position;
        this.view = view;
    }

    @
            Override
    public int compareTo(PendingSwipeData other) {
        // Sort by descending position
        return other.position - position;
    }
}

private void performSwipeAction(final View swipeView, final int swipePosition, boolean toTheRight, boolean dismiss) {
    // 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.

    final ViewGroup.LayoutParams lp = swipeView.getLayoutParams();
    final int originalHeight = swipeView.getHeight();
    final boolean swipeRight = toTheRight;

    ValueAnimator animator;
    if (dismiss)
        animator = ValueAnimator.ofInt(originalHeight, 1).setDuration(mAnimationTime);
    else
        animator = ValueAnimator.ofInt(originalHeight, originalHeight - 1).setDuration(mAnimationTime);


    animator.addListener(new AnimatorListenerAdapter() {@
                                                                Override
                                                        public void onAnimationEnd(Animator animation) {
        --mDismissAnimationRefCount;
        if (mDismissAnimationRefCount == 0) {
            // No active animations, process all pending dismisses.
            // Sort by descending position
            Collections.sort(mPendingSwipes);

            int[] swipePositions = new int[mPendingSwipes.size()];
            for (int i = mPendingSwipes.size() - 1; i >= 0; i--) {
                swipePositions[i] = mPendingSwipes.get(i).position;
            }
            if (swipeRight)
                mCallback.onSwipeRight(mListView, swipePositions);
            else
                mCallback.onSwipeLeft(mListView, swipePositions);

            ViewGroup.LayoutParams lp;
            for (PendingSwipeData pendingDismiss: mPendingSwipes) {
                // Reset view presentation
                pendingDismiss.view.setAlpha(1f);
                pendingDismiss.view.setTranslationX(0);
                lp = pendingDismiss.view.getLayoutParams();
                lp.height = originalHeight;
                pendingDismiss.view.setLayoutParams(lp);
            }

            mPendingSwipes.clear();
        }
    }
    });

    animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {@
                                                                                   Override
                                                                           public void onAnimationUpdate(ValueAnimator valueAnimator) {
        lp.height = (Integer) valueAnimator.getAnimatedValue();
        swipeView.setLayoutParams(lp);
    }
    });

    mPendingSwipes.add(new PendingSwipeData(swipePosition, swipeView));
    animator.start();
}}

Answer 1

好的，所以我在Android Studio中嘗試了代碼。 計算出為了使您能夠基於已刷過的項目執行特定的活動，最好的方法是能夠接收已被刷過的項目的位置。 因此，我檢查了SwipeListViewTouchListener並找到了performSwipeAction的特定部分，並注意到參數final int swipePosition並對其進行了修改...

    private void performSwipeAction(final View swipeView, final int swipePosition, boolean toTheRight, boolean dismiss) {
            // 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.

            final ViewGroup.LayoutParams lp = swipeView.getLayoutParams();
            final int originalHeight = swipeView.getHeight();
            final boolean swipeRight = toTheRight;

            ValueAnimator animator;
            if (dismiss)
                animator = ValueAnimator.ofInt(originalHeight, 1).setDuration(mAnimationTime);
            else
                animator = ValueAnimator.ofInt(originalHeight, originalHeight - 1).setDuration(mAnimationTime);


            animator.addListener(new AnimatorListenerAdapter() {
                @
                        Override
                public void onAnimationEnd(Animator animation) {
                    --mDismissAnimationRefCount;
                    if (mDismissAnimationRefCount == 0) {
                        // No active animations, process all pending dismisses.
                        // Sort by descending position
                        Collections.sort(mPendingSwipes);

                        int[] swipePositions = new int[mPendingSwipes.size()];
                        for (int i = mPendingSwipes.size() - 1; i >= 0; i--) {
                            swipePositions[i] = mPendingSwipes.get(i).position;
                        }
                        if (swipeRight) {
                            mCallback.onSwipeRight(mListView, swipePositions);
                            Log.d("SAMPLE", "SAMPLE IN SWIPE -- " + swipePosition);
                        }else {
Log.d("SAMPLE", "SAMPLE IN SWIPE -- " + swipePosition);
                            mCallback.onSwipeLeft(mListView, swipePositions);
                        }
                        ViewGroup.LayoutParams lp;
                        for (PendingSwipeData pendingDismiss : mPendingSwipes) {
                            // Reset view presentation
                            pendingDismiss.view.setAlpha(1f);
                            pendingDismiss.view.setTranslationX(0);
                            lp = pendingDismiss.view.getLayoutParams();
                            lp.height = originalHeight;
                            pendingDismiss.view.setLayoutParams(lp);
                        }

                        mPendingSwipes.clear();
                    }
                }
            });

並能夠為listview項接收正確的位置（最高的listview項為0，依此類推）。 現在，您要做的就是更改回調中的參數-添加swipePosition，然后使用它來引用listviewitem並基於此啟動活動。 ：D希望這可以在某種程度上幫助您。 :)