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package com.ekoconnect.afriphotos; /**/* w ww. java 2 s . c o m*/ * Copyright 2012-2013 Jeremie Martinez (jeremiemartinez@gmail.com) * * Licensed under the Apache License, Version 2.0 (the "License"); you may not * use this file except in compliance with the License. You may obtain a copy of * the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations under * the License. */ import java.text.DateFormat; import java.util.Date; import android.content.Context; import android.util.AttributeSet; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.ViewConfiguration; import android.view.animation.Animation; import android.view.animation.RotateAnimation; import android.view.animation.Transformation; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.ListView; import android.widget.ProgressBar; import android.widget.RelativeLayout; import android.widget.TextView; import android.widget.Toast; import com.ekoconnect.afriphotos.R; /** * @author jmartinez * * Simple Android ListView that enables pull to refresh as Twitter or Facebook apps ListView. Developers must implement OnRefreshListener interface and set it to the list. They also have to * call finishRefreshing when their task is done. See <a href="https://github.com/jeremiemartinez/RefreshListView">Project Site</a> for more information. * */ public class RefreshListView extends ListView { private static final int RESISTANCE = 3; private static final int HEADER_HEIGHT = 60; private static final int DURATION = 300; private OnRefreshListener refreshListener; private View container; private RelativeLayout header; private ProgressBar progress; private TextView comment; private ImageView arrow; private TextView date; private LayoutInflater inflater; private float currentY; private int headerHeight; private boolean enabledDate; private Date lastUpdateDate; private DateFormat formatter; private State currentState; private enum State { PULLDOWN, RELEASE, UPDATING; } private enum Rotation { CLOCKWISE, ANTICLOCKWISE; } public RefreshListView(Context context) { super(context); init(context); } public RefreshListView(Context context, AttributeSet attrs) { super(context, attrs); init(context); } public RefreshListView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); init(context); } /** * initializing method. Call in constructors to set up the headers. * * @param context * activity context, got by constructors */ private void init(Context context) { formatter = DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.SHORT); inflater = LayoutInflater.from(context); container = inflater.inflate(R.layout.layout_refreshlistview_header, null); header = (RelativeLayout) container.findViewById(R.id.header); arrow = (ImageView) container.findViewById(R.id.arrow); progress = (ProgressBar) container.findViewById(R.id.progress); date = (TextView) container.findViewById(R.id.date); comment = (TextView) container.findViewById(R.id.comment); container.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT)); header.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT)); addHeaderView(container); headerHeight = (int) (HEADER_HEIGHT * getContext().getResources().getDisplayMetrics().density); changeHeaderHeight(0); comment.setText(getResources().getString(R.string.refreshlistview_pulldown)); currentState = State.PULLDOWN; } /** * Call to perform item click. Reset the position without the header * * @see android.widget.AbsListView#performItemClick(android.view.View, int, long) */ @Override public boolean performItemClick(View view, int position, long id) { if (position == 0) { return true; } else { return super.performItemClick(view, position - getHeaderViewsCount(), id); } } /** * Set up first touch to later calculations. * * @see android.widget.AbsListView#onInterceptTouchEvent(android.view.MotionEvent ) */ @Override public boolean onInterceptTouchEvent(MotionEvent ev) { switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: currentY = ev.getY(); break; } return super.onInterceptTouchEvent(ev); } /** * Handle what to do when the user release the touch. * * @see android.widget.AbsListView#onTouchEvent(android.view.MotionEvent) */ @Override public boolean onTouchEvent(final MotionEvent ev) { switch (ev.getAction()) { case MotionEvent.ACTION_UP: if (currentState != State.UPDATING) { if (currentState == State.RELEASE) { header.startAnimation(new ResizeHeaderAnimation(headerHeight)); startRefreshing(); } else { header.startAnimation(new ResizeHeaderAnimation(0)); } } else { header.startAnimation(new ResizeHeaderAnimation(headerHeight)); } } return super.onTouchEvent(ev); } /** * Used to show header when scrolling down. * * @see android.view.ViewGroup#dispatchTouchEvent(android.view.MotionEvent) */ @Override public boolean dispatchTouchEvent(final MotionEvent ev) { if (ev.getAction() == MotionEvent.ACTION_MOVE && getFirstVisiblePosition() == 0) { if (isAllowedToShowHeader(ev.getY())) { changeHeaderHeight(getHeightWithScrollResistance(ev.getY())); } } return super.dispatchTouchEvent(ev); } /** * Call to update UI when the refresh started. */ private void startRefreshing() { arrow.clearAnimation(); arrow.setVisibility(View.INVISIBLE); progress.setVisibility(View.VISIBLE); comment.setText(getResources().getString(R.string.refreshlistview_updating)); if (refreshListener != null) { refreshListener.onRefresh(this); } currentState = State.UPDATING; } /** * Call when refreshing task is done. Must be called by the developer. */ public void finishRefreshing() { finishRefreshing(null); } /** * Call when refreshing task is done. Must be called by the developer. * * @param updateDate * allow developer to set the last updateDate */ public void finishRefreshing(Date updateDate) { header.startAnimation(new ResizeHeaderAnimation(0)); progress.setVisibility(View.INVISIBLE); arrow.setVisibility(View.VISIBLE); if (updateDate == null) lastUpdateDate = new Date(); else lastUpdateDate = updateDate; date.setText(getFormattedDate(lastUpdateDate)); comment.setText(getResources().getString(R.string.refreshlistview_pulldown)); currentState = State.PULLDOWN; invalidate(); } /** * Change the header height while scrolling down by making it visible and increasing topMargin of the header. * * @param height * the height of the header */ private void changeHeaderHeight(int height) { hideOrShowHeader(height); LayoutParams layoutParams = (LayoutParams) container.getLayoutParams(); layoutParams.height = height; container.setLayoutParams(layoutParams); LinearLayout.LayoutParams headerLayoutParams = (LinearLayout.LayoutParams) header.getLayoutParams(); headerLayoutParams.topMargin = height - headerHeight; header.setLayoutParams(headerLayoutParams); if (currentState != State.UPDATING) { if (height > headerHeight && currentState == State.PULLDOWN) { arrow.startAnimation(getRotationAnimation(Rotation.ANTICLOCKWISE)); comment.setText(getResources().getString(R.string.refreshlistview_release)); currentState = State.RELEASE; } else if (height < headerHeight && currentState == State.RELEASE) { arrow.startAnimation(getRotationAnimation(Rotation.CLOCKWISE)); comment.setText(getResources().getString(R.string.refreshlistview_pulldown)); currentState = State.PULLDOWN; } } } /** * Check whether or not the header should be shown. * * @param newY * just acquired Y event * @return true if it is, false otherwise */ private boolean isAllowedToShowHeader(float newY) { return isScrollingEnough(newY) && (currentState != State.UPDATING || (currentState == State.UPDATING && (newY - currentY) > 0)); } /** * Check if the scroll is enough to be taken into acccount. * * @param newY * just acquired Y event * @return true if it is, false otherwise */ private boolean isScrollingEnough(float newY) { float deltaY = Math.abs(currentY - newY); ViewConfiguration config = ViewConfiguration.get(getContext()); return deltaY > config.getScaledTouchSlop(); } /** * Calculate height header when scrolling down. * * @param newY * just acquired Y event * @return the height of the header to set */ private int getHeightWithScrollResistance(float newY) { return Math.max((int) (newY - currentY) / RESISTANCE, 0); } /** * Hide or show the header according to its height. * * @param height * current height of the header */ private void hideOrShowHeader(int height) { if (height <= 0) { header.setVisibility(View.GONE); } else { header.setVisibility(View.VISIBLE); } } /** * Getter to know if date is enabled * * @return true if date is enabled, false otherwise */ public boolean isEnabledDate() { return enabledDate; } /** * Set enabled date, the first date to show will just be "No past update". * * @param enabledDate */ public void setEnabledDate(boolean enabledDate) { setEnabledDate(enabledDate, null); } public void setEnabledDate(boolean enabledDate, Date firstDate) { this.enabledDate = enabledDate; lastUpdateDate = firstDate; if (enabledDate) { date.setVisibility(View.VISIBLE); if (firstDate != null) { date.setText(getFormattedDate(firstDate)); } else { date.setText(getResources().getString(R.string.refreshlistview_no_update)); } } else { date.setVisibility(View.GONE); } } /** * Getter for last update date. * * @return the last update date or null is it has never been updated yet. */ public Date getLastUpdateDate() { return lastUpdateDate; } private String getFormattedDate(Date date) { return formatter.format(date); } public void setRefreshListener(OnRefreshListener listener) { this.refreshListener = listener; } /** * Callback. Call when user asks to refresh the list. Required to be implemented by developer. */ public interface OnRefreshListener { public void onRefresh(RefreshListView listView); } private Animation getRotationAnimation(Rotation rotation) { int fromAngle = 0; int toAngle = 0; if (rotation == Rotation.ANTICLOCKWISE) toAngle = 180; else fromAngle = 180; Animation animation = new RotateAnimation(fromAngle, toAngle, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); animation.setDuration(DURATION); animation.setFillAfter(true); return animation; } /** * Animation to resize the header's height */ public class ResizeHeaderAnimation extends Animation { private int toHeight; public ResizeHeaderAnimation(int toHeight) { this.toHeight = toHeight; setDuration(DURATION); } /** * Animation core, animate the height of the header to a specific value. * * @see android.view.animation.Animation#applyTransformation(float, android.view.animation.Transformation) */ @Override protected void applyTransformation(float interpolatedTime, Transformation t) { float height = (toHeight - container.getHeight()) * interpolatedTime + container.getHeight(); LayoutParams lp = (LayoutParams) container.getLayoutParams(); LinearLayout.LayoutParams headerlp = (LinearLayout.LayoutParams) header.getLayoutParams(); headerlp.topMargin = (int) height - headerHeight; lp.height = (int) height; lp.width = (int) container.getWidth(); container.requestLayout(); } /** * Used at the end of the animation to hide completely the header if it's required (toHeight == 0). * * @see android.view.animation.Animation#getTransformation(long, android.view.animation.Transformation) */ @Override public boolean getTransformation(long currentTime, Transformation outTransformation) { hideOrShowHeader(toHeight); return super.getTransformation(currentTime, outTransformation); } } /** * Display a toast when there is an error in refresh task * * @param errorMessage * error message to display */ public void errorInRefresh(String errorMessage) { Toast.makeText(getContext(), errorMessage, Toast.LENGTH_SHORT).show(); } }