android listview gridview scrollview 各种拉动加载

package com.stay.pull.lib; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Color; import android.os.Handler; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.View; import android.view.ViewConfiguration; import android.view.ViewGroup; import android.view.animation.AccelerateDecelerateInterpolator; import android.view.animation.Interpolator; import android.widget.LinearLayout; import com.stay.pull.R; import com.stay.pull.lib.internal.LoadingLayout; public abstract class PullToRefreshBase<T extends View> extends LinearLayout { final class SmoothScrollRunnable implements Runnable { static final int ANIMATION_DURATION_MS = 190; static final int ANIMATION_FPS = 1000 / 60; private final Interpolator interpolator; private final int scrollToY; private final int scrollFromY; private final Handler handler; private boolean continueRunning = true; private long startTime = -1; private int currentY = -1; public SmoothScrollRunnable(Handler handler, int fromY, int toY) { this.handler = handler; this.scrollFromY = fromY; this.scrollToY = toY; this.interpolator = new AccelerateDecelerateInterpolator(); } @Override public void run() { /** * Only set startTime if this is the first time we're starting, else * actually calculate the Y delta */ if (startTime == -1) { startTime = System.currentTimeMillis(); } else { /** * We do do all calculations in long to reduce software float * calculations. We use 1000 as it gives us good accuracy and * small rounding errors */ long normalizedTime = (1000 * (System.currentTimeMillis() - startTime)) / ANIMATION_DURATION_MS; normalizedTime = Math.max(Math.min(normalizedTime, 1000), 0); final int deltaY = Math.round((scrollFromY - scrollToY) * interpolator.getInterpolation(normalizedTime / 1000f)); this.currentY = scrollFromY - deltaY; setHeaderScroll(currentY); } // If we're not at the target Y, keep going... if (continueRunning && scrollToY != currentY) { handler.postDelayed(this, ANIMATION_FPS); } } public void stop() { this.continueRunning = false; this.handler.removeCallbacks(this); } }; // =========================================================== // Constants // =========================================================== static final float FRICTION = 2.0f; static final int PULL_TO_REFRESH = 0x0; static final int RELEASE_TO_REFRESH = 0x1; static final int REFRESHING = 0x2; static final int MANUAL_REFRESHING = 0x3; public static final int MODE_PULL_DOWN_TO_REFRESH = 0x1; public static final int MODE_PULL_UP_TO_REFRESH = 0x2; public static final int MODE_BOTH = 0x3; // =========================================================== // Fields // =========================================================== private int touchSlop; private float initialMotionY; private float lastMotionX; private float lastMotionY; private boolean isBeingDragged = false; private int state = PULL_TO_REFRESH; private int mode = MODE_PULL_DOWN_TO_REFRESH; private int currentMode; private boolean disableScrollingWhileRefreshing = true; T refreshableView; private boolean isPullToRefreshEnabled = true; private LoadingLayout headerLayout; private LoadingLayout footerLayout; private int headerHeight; private final Handler handler = new Handler(); private OnRefreshListener onRefreshListener; private SmoothScrollRunnable currentSmoothScrollRunnable; // =========================================================== // Constructors // =========================================================== public PullToRefreshBase(Context context) { super(context); init(context, null); } public PullToRefreshBase(Context context, int mode) { super(context); this.mode = mode; init(context, null); } public PullToRefreshBase(Context context, AttributeSet attrs) { super(context, attrs); init(context, attrs); } // =========================================================== // Getter & Setter // =========================================================== /** * Deprecated. Use {@link #getRefreshableView()} from now on. * * @deprecated * @return The Refreshable View which is currently wrapped */ public final T getAdapterView() { return refreshableView; } /** * Get the Wrapped Refreshable View. Anything returned here has already been * added to the content view. * * @return The View which is currently wrapped */ public final T getRefreshableView() { return refreshableView; } /** * Whether Pull-to-Refresh is enabled * * @return enabled */ public final boolean isPullToRefreshEnabled() { return isPullToRefreshEnabled; } /** * Returns whether the widget has disabled scrolling on the Refreshable View * while refreshing. * * @param true if the widget has disabled scrolling while refreshing */ public final boolean isDisableScrollingWhileRefreshing() { return disableScrollingWhileRefreshing; } /** * Returns whether the Widget is currently in the Refreshing state * * @return true if the Widget is currently refreshing */ public final boolean isRefreshing() { return state == REFRESHING || state == MANUAL_REFRESHING; } /** * By default the Widget disabled scrolling on the Refreshable View while * refreshing. This method can change this behaviour. * * @param disableScrollingWhileRefreshing * - true if you want to disable scrolling while refreshing */ public final void setDisableScrollingWhileRefreshing(boolean disableScrollingWhileRefreshing) { this.disableScrollingWhileRefreshing = disableScrollingWhileRefreshing; } /** * Mark the current Refresh as complete. Will Reset the UI and hide the * Refreshing View */ public final void onRefreshComplete() { if (state != PULL_TO_REFRESH) { resetHeader(); } } /** * Set OnRefreshListener for the Widget * * @param listener * - Listener to be used when the Widget is set to Refresh */ public final void setOnRefreshListener(OnRefreshListener listener) { onRefreshListener = listener; } /** * A mutator to enable/disable Pull-to-Refresh for the current View * * @param enable * Whether Pull-To-Refresh should be used */ public final void setPullToRefreshEnabled(boolean enable) { this.isPullToRefreshEnabled = enable; } /** * Set Text to show when the Widget is being pulled, and will refresh when * released * * @param releaseLabel * - String to display */ public void setReleaseLabel(String releaseLabel) { if (null != headerLayout) { headerLayout.setReleaseLabel(releaseLabel); } if (null != footerLayout) { footerLayout.setReleaseLabel(releaseLabel); } } /** * Set Text to show when the Widget is being Pulled * * @param pullLabel * - String to display */ public void setPullLabel(String pullLabel) { if (null != headerLayout) { headerLayout.setPullLabel(pullLabel); } if (null != footerLayout) { footerLayout.setPullLabel(pullLabel); } } /** * Set Text to show when the Widget is refreshing * * @param refreshingLabel * - String to display */ public void setRefreshingLabel(String refreshingLabel) { if (null != headerLayout) { headerLayout.setRefreshingLabel(refreshingLabel); } if (null != footerLayout) { footerLayout.setRefreshingLabel(refreshingLabel); } } public final void setRefreshing() { this.setRefreshing(true); } /** * Sets the Widget to be in the refresh state. The UI will be updated to * show the 'Refreshing' view. * * @param doScroll * - true if you want to force a scroll to the Refreshing view. */ public final void setRefreshing(boolean doScroll) { if (!isRefreshing()) { setRefreshingInternal(doScroll); state = MANUAL_REFRESHIN