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Android中怎么实现折叠效果

今天就跟大家聊聊有关Android中怎么实现折叠效果，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。

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MainActivity.java
  2.  /* 
  3. Copyright 2012 Aphid Mobile 
  4.  
  5. Licensed under the Apache License, Version 2.0 (the "License"); 
  6. you may not use this file except in compliance with the License. 
  7. You may obtain a copy of the License at 
  8.   
  9.    http://www.apache.org/licenses/LICENSE-2.0 
  10.  
  11. Unless required by applicable law or agreed to in writing, software 
  12. distributed under the License is distributed on an "AS IS" BASIS, 
  13. WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
  14. See the License for the specific language governing permissions and 
  15. limitations under the License. 
  16.  */ 
  17.  
  18. package com.aphidmobile.flip.demo; 
  19.  
  20. import android.app.Activity; 
  21. import android.app.ListActivity; 
  22. import android.content.Intent; 
  23. import android.net.Uri; 
  24. import android.os.Bundle; 
  25. import android.view.*; 
  26. import android.widget.ListView; 
  27. import android.widget.SimpleAdapter; 
  28. import com.aphidmobile.flipview.demo.R; 
  29.  
  30. import java.util.*; 
  31.  
  32. public class MainActivity extends ListActivity { 
  33.     @Override 
  34.     protected void onCreate(Bundle savedInstanceState) { 
  35.         super.onCreate(savedInstanceState); 
  36.         setListAdapter( 
  37.             new SimpleAdapter( 
  38.                 this, getData(), android.R.layout.simple_list_item_1, new String[]{"title"}, new int[]{android.R.id.text1} 
  39.             ) 
  40.         ); 
  41.         getListView().setScrollbarFadingEnabled(false); 
  42.     } 
  43.      
  44.     @Override 
  45.     public boolean onCreateOptionsMenu(Menu menu) { 
  46.         getMenuInflater().inflate(R.menu.main, menu); 
  47.         return true; 
  48.     } 
  49.  
  50.     @Override 
  51.     public boolean onOptionsItemSelected(MenuItem item) { 
  52.         Intent intent = new Intent( 
  53.             Intent.ACTION_VIEW, 
  54.             Uri.parse("http://openaphid.github.com/") 
  55.         ); 
  56.         startActivity(intent); 
  57.  
  58.         return true; 
  59.     } 
  60.  
  61.     @SuppressWarnings("unchecked") 
  62.     @Override 
  63.     protected void onListItemClick(ListView l, View v, int position, long id) { 
  64.         Map map = (Map) l.getItemAtPosition(position); 
  65.         Intent intent = new Intent(this, (Class)map.get("activity")); 
  66.         startActivity(intent); 
  67.     } 
  68.  
  69.     private List> getData() { 
  70.         List> data = new ArrayList>(); 
  71.         addItem(data, "TextViews", FlipTextViewActivity.class); 
  72.         addItem(data, "Buttons", FlipButtonActivity.class); 
  73.         addItem(data, "Complex Layouts", FlipComplexLayoutActivity.class); 
  74.         addItem(data, "Async Content", FlipAsyncContentActivity.class); 
  75.         addItem(data, "Event Listener", FlipTextViewAltActivity.class); 
  76.         addItem(data, "Horizontal", FlipHorizontalLayoutActivity.class); 
  77.         addItem(data, "Issue #5", Issue***ctivity.class); 
  78.         addItem(data, "XML Configuration", FlipTextViewXmlActivity.class); 
  79.         addItem(data, "Fragment", FlipFragmentActivity.class); 
  80.         addItem(data, "Dynamic Adapter Size", FlipDynamicAdapterActivity.class); 
  81.          
  82.         return data; 
  83.     } 
  84.  
  85.     private void addItem(List> data, String title, Class activityClass) { 
  86.         Map map = new HashMap(); 
  87.         map.put("title", data.size() + ". " + title); 
  88.         map.put("activity", activityClass); 
  89.         data.add(map); 
  90.     } 
  91. } 
  92.   

FlipViewController.java

/* Copyright 2012 Aphid Mobile  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.   */  package com.aphidmobile.flip;  import android.content.Context; import android.content.res.Configuration; import android.content.res.TypedArray; import android.database.DataSetObserver; import android.graphics.Bitmap; import android.graphics.PixelFormat; import android.opengl.GLSurfaceView; import android.os.Handler; import android.os.Message; import android.util.AttributeSet; import android.view.*; import android.widget.AbsListView; import android.widget.Adapter; import android.widget.AdapterView; import com.aphidmobile.utils.AphidLog; import com.openaphid.flip.R; import junit.framework.Assert;  import java.util.LinkedList;  public class FlipViewController extends AdapterView {      public static final int VERTICAL = 0;     public static final int HORIZONTAL = 1;      public static interface ViewFlipListener {         void onViewFlipped(View view, int position);     }      private static final int MAX_RELEASED_VIEW_SIZE = 1;      private static final int MSG_SURFACE_CREATED = 1;      private Handler handler = new Handler(new Handler.Callback() {         @Override         public boolean handleMessage(Message msg) {             if (msg.what == MSG_SURFACE_CREATED) {                 contentWidth = 0;                 contentHeight = 0;                 requestLayout();                 return true;             }             return false;         }     });      private GLSurfaceView surfaceView;     private FlipRenderer renderer;     private FlipCards cards;      private int contentWidth;     private int contentHeight;      @ViewDebug.ExportedProperty     private int flipOrientation;      private boolean inFlipAnimation = false;      //AdapterView Related     private Adapter adapter;      private int adapterDataCount = 0;      private DataSetObserver adapterDataObserver;      private final LinkedList bufferedViews = new LinkedList();     private final LinkedList releasedViews = new LinkedList(); //XXX: use a SparseArray to keep the related view indices?     private int bufferIndex = -1;     private int adapterIndex = -1;     private int sideBufferSize = 1;      private float touchSlop;      private ViewFlipListener onViewFlipListener;      @ViewDebug.ExportedProperty     private Bitmap.Config animationBitmapFormat = Bitmap.Config.ARGB_8888;      public FlipViewController(Context context) {         this(context, VERTICAL);     }      public FlipViewController(Context context, int flipOrientation) {         super(context);         init(context, flipOrientation);     }      /**      * Constructor required for XML inflation.      */     public FlipViewController(Context context, AttributeSet attrs, int defStyle) {         super(context, attrs, defStyle);          int orientation = VERTICAL;          TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.FlipViewController, 0, 0);          try {             int value = a.getInteger(R.styleable.FlipViewController_orientation, VERTICAL);             if (value == HORIZONTAL)                 orientation = HORIZONTAL;              value = a.getInteger(R.styleable.FlipViewController_animationBitmapFormat, 0);             if (value == 1)                 setAnimationBitmapFormat(Bitmap.Config.ARGB_4444);             else if (value == 2)                 setAnimationBitmapFormat(Bitmap.Config.RGB_565);             else                 setAnimationBitmapFormat(Bitmap.Config.ARGB_8888);         } finally {             a.recycle();         }          init(context, orientation);     }      /**      * Constructor required for XML inflation.      */     public FlipViewController(Context context, AttributeSet attrs) {         this(context, attrs, 0);     }      private void init(Context context, int orientation) {         ViewConfiguration configuration = ViewConfiguration.get(getContext());         touchSlop = configuration.getScaledTouchSlop();         this.flipOrientation = orientation;         setupSurfaceView(context);     }      public Bitmap.Config getAnimationBitmapFormat() {         return animationBitmapFormat;     }      /**      * Set the bitmap config for the animation, default is ARGB_8888, which provides the best quality with large peak memory consumption.      *      * @param animationBitmapFormat ALPHA_8 is not supported and will throw exception when binding textures      */     public void setAnimationBitmapFormat(Bitmap.Config animationBitmapFormat) {         this.animationBitmapFormat = animationBitmapFormat;     }      public ViewFlipListener getOnViewFlipListener() {         return onViewFlipListener;     }      public void setOnViewFlipListener(ViewFlipListener onViewFlipListener) {         this.onViewFlipListener = onViewFlipListener;     }      public void onResume() {         surfaceView.onResume();     }      public void onPause() {         surfaceView.onPause();     }      /**      * Request the animator to update display if the pageView has been preloaded.      * 
      * If the pageView is being used in the animation or its content has been buffered, the animator forcibly reloads it.      * 
      * The reloading process is a bit heavy for an active page, so please don't invoke it too frequently for an active page. The cost is trivial for inactive pages.      *      * @param pageView      */     public void refreshPage(View pageView) {         if (cards.refreshPageView(pageView))             requestLayout();     }      /**      * @param pageIndex      * @see #refreshPage(android.view.View)      */     public void refreshPage(int pageIndex) {         if (cards.refreshPage(pageIndex))             requestLayout();     }      /**      * Force the animator reload all preloaded pages      */     public void refreshAllPages() {         cards.refreshAllPages();         requestLayout();     }      //--------------------------------------------------------------------------------------------------------------------     // Touch Event     @Override     public boolean onInterceptTouchEvent(MotionEvent event) {         return cards.handleTouchEvent(event, false);     }      @Override     public boolean onTouchEvent(MotionEvent event) {         return cards.handleTouchEvent(event, true);     }      //--------------------------------------------------------------------------------------------------------------------     // Orientation     @Override     protected void onConfigurationChanged(Configuration newConfig) {         super.onConfigurationChanged(newConfig);         //XXX: adds a global layout listener?     }      //--------------------------------------------------------------------------------------------------------------------     // AdapterView     @Override     public Adapter getAdapter() {         return adapter;     }      @Override     public void setAdapter(Adapter adapter) {         setAdapter(adapter, 0);     }      public void setAdapter(Adapter adapter, int initialPosition) {         if (this.adapter != null)             this.adapter.unregisterDataSetObserver(adapterDataObserver);          Assert.assertNotNull("adapter should not be null", adapter);          this.adapter = adapter;         adapterDataCount = adapter.getCount();          adapterDataObserver = new MyDataSetObserver();         this.adapter.registerDataSetObserver(adapterDataObserver);         if (adapterDataCount > 0)             setSelection(initialPosition);     }      @Override     public View getSelectedView() {         return (bufferIndex < bufferedViews.size() && bufferIndex >= 0) ? bufferedViews.get(bufferIndex) : null;     }      @Override     public void setSelection(int position) {         if (adapter == null)             return;          Assert.assertTrue("Invalid selection position", position >= 0 && position < adapterDataCount);          releaseViews();          View selectedView = viewFromAdapter(position, true);         bufferedViews.add(selectedView);          for (int i = 1; i <= sideBufferSize; i++) {             int previous = position - i;             int next = position + i;              if (previous >= 0)                 bufferedViews.addFirst(viewFromAdapter(previous, false));             if (next < adapterDataCount)                 bufferedViews.addLast(viewFromAdapter(next, true));         }          bufferIndex = bufferedViews.indexOf(selectedView);         adapterIndex = position;          requestLayout();         updateVisibleView(inFlipAnimation ? -1 : bufferIndex);          cards.resetSelection(position, adapterDataCount);     }      @Override     public int getSelectedItemPosition() {         return adapterIndex;     }      //--------------------------------------------------------------------------------------------------------------------     // Layout     @Override     protected void onLayout(boolean changed, int l, int t, int r, int b) {         if (AphidLog.ENABLE_DEBUG)             AphidLog.d("onLayout: %d, %d, %d, %d; child %d", l, t, r, b, bufferedViews.size());          for (View child : bufferedViews)             child.layout(0, 0, r - l, b - t);          if (changed || contentWidth == 0) {             int w = r - l;             int h = b - t;             surfaceView.layout(0, 0, w, h);              if (contentWidth != w || contentHeight != h) {                 contentWidth = w;                 contentHeight = h;             }         }          if (bufferedViews.size() >= 1) {             View frontView = bufferedViews.get(bufferIndex);             View backView = null;             if (bufferIndex < bufferedViews.size() - 1)                 backView = bufferedViews.get(bufferIndex + 1);             renderer.updateTexture(adapterIndex, frontView, backView == null ? -1 : adapterIndex + 1, backView);         }     }      @Override     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {         super.onMeasure(widthMeasureSpec, heightMeasureSpec);          for (View child : bufferedViews)             child.measure(widthMeasureSpec, heightMeasureSpec);          surfaceView.measure(widthMeasureSpec, heightMeasureSpec);     }      //--------------------------------------------------------------------------------------------------------------------     //internal exposed properties & methods     float getTouchSlop() {         return touchSlop;     }      GLSurfaceView getSurfaceView() {         return surfaceView;     }      FlipRenderer getRenderer() {         return renderer;     }      int getContentWidth() {         return contentWidth;     }      int getContentHeight() {         return contentHeight;     }      void reloadTexture() {         handler.sendMessage(Message.obtain(handler, MSG_SURFACE_CREATED));     }      //--------------------------------------------------------------------------------------------------------------------     // Internals     private void setupSurfaceView(Context context) {         surfaceView = new GLSurfaceView(getContext());          cards = new FlipCards(this, flipOrientation == VERTICAL);         renderer = new FlipRenderer(this, cards);          surfaceView.setEGLConfigChooser(8, 8, 8, 8, 16, 0);         surfaceView.setZOrderOnTop(true);         surfaceView.setRenderer(renderer);         surfaceView.getHolder().setFormat(PixelFormat.TRANSLUCENT);         surfaceView.setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);          addViewInLayout(surfaceView, -1, new AbsListView.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT), false);     }      private void releaseViews() {         for (View view : bufferedViews)             releaseView(view);         bufferedViews.clear();         bufferIndex = -1;         adapterIndex = -1;     }      private void releaseView(View view) {         Assert.assertNotNull(view);         detachViewFromParent(view);         addReleasedView(view);     }      private void addReleasedView(View view) {         Assert.assertNotNull(view);         if (releasedViews.size() < MAX_RELEASED_VIEW_SIZE)             releasedViews.add(view);     }      private View viewFromAdapter(int position, boolean addToTop) {         Assert.assertNotNull(adapter);          View releasedView = releasedViews.isEmpty() ? null : releasedViews.removeFirst();          View view = adapter.getView(position, releasedView, this);         if (releasedView != null && view != releasedView)             addReleasedView(releasedView);          setupAdapterView(view, addToTop, view == releasedView);         return view;     }      private void setupAdapterView(View view, boolean addToTop, boolean isReusedView) {         LayoutParams params = view.getLayoutParams();         if (params == null) {             params = new AbsListView.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT, 0);         }          if (isReusedView)             attachViewToParent(view, addToTop ? 0 : 1, params);         else             addViewInLayout(view, addToTop ? 0 : 1, params, true);     }      private void updateVisibleView(int index) {         /*         if (AphidLog.ENABLE_DEBUG)             AphidLog.d("Update visible views, index %d, buffered: %d, adapter %d", index, bufferedViews.size(), adapterIndex);         */          for (int i = 0; i < bufferedViews.size(); i++)             bufferedViews.get(i).setVisibility(index == i ? VISIBLE : INVISIBLE);     }      private void debugBufferedViews() {         if (AphidLog.ENABLE_DEBUG)             AphidLog.d("bufferedViews: %s; buffer index %d, adapter index %d", bufferedViews, bufferIndex, adapterIndex);     }      void postFlippedToView(final int indexInAdapter) {         handler.post(new Runnable() {             @Override             public void run() {                 flippedToView(indexInAdapter, true);             }         });     }      void flippedToView(final int indexInAdapter, boolean isPost) {         if (AphidLog.ENABLE_DEBUG)             AphidLog.d("flippedToView: %d, isPost %s", indexInAdapter, isPost);          debugBufferedViews();          if (indexInAdapter >= 0 && indexInAdapter < adapterDataCount) {              if (indexInAdapter == adapterIndex + 1) { //forward one page                 if (adapterIndex < adapterDataCount - 1) {                     adapterIndex++;                     View old = bufferedViews.get(bufferIndex);                     if (bufferIndex > 0)                         releaseView(bufferedViews.removeFirst());                     if (adapterIndex + sideBufferSize < adapterDataCount)                         bufferedViews.addLast(viewFromAdapter(adapterIndex + sideBufferSize, true));                     bufferIndex = bufferedViews.indexOf(old) + 1;                     requestLayout();                     updateVisibleView(inFlipAnimation ? -1 : bufferIndex);                 }             } else if (indexInAdapter == adapterIndex - 1) {                 if (adapterIndex > 0) {                     adapterIndex--;                     View old = bufferedViews.get(bufferIndex);                     if (bufferIndex < bufferedViews.size() - 1)                         releaseView(bufferedViews.removeLast());                     if (adapterIndex - sideBufferSize >= 0)                         bufferedViews.addFirst(viewFromAdapter(adapterIndex - sideBufferSize, false));                     bufferIndex = bufferedViews.indexOf(old) - 1;                     requestLayout();                     updateVisibleView(inFlipAnimation ? -1 : bufferIndex);                 }             } else {                 AphidLog.e("Should not happen: indexInAdapter %d, adapterIndex %d", indexInAdapter, adapterIndex);             }         } else             Assert.fail("Invalid indexInAdapter: " + indexInAdapter);         //debugBufferedViews();     }      void showFlipAnimation() {         if (!inFlipAnimation) {             inFlipAnimation = true;              cards.setVisible(true);             surfaceView.requestRender();              handler.postDelayed(new Runnable() { //use a delayed message to avoid flicker, the perfect solution would be sending a message from the GL thread                  public void run() {                     if (inFlipAnimation)                         updateVisibleView(-1);                 }             }, 100);         }     }      void postHideFlipAnimation() {         if (inFlipAnimation) {             handler.post(new Runnable() {                 @Override                 public void run() {                     hideFlipAnimation();                 }             });         }     }      private void hideFlipAnimation() {         if (inFlipAnimation) {             inFlipAnimation = false;              updateVisibleView(bufferIndex);              if (onViewFlipListener != null)                 onViewFlipListener.onViewFlipped(bufferedViews.get(bufferIndex), adapterIndex);              handler.post(new Runnable() {                 public void run() {                     if (!inFlipAnimation) {                         cards.setVisible(false);                         surfaceView.requestRender(); //ask OpenGL to clear its display                     }                 }             });         }     }      private void onDataChanged() {         adapterDataCount = adapter.getCount();         int activeIndex;         if (adapterIndex < 0)             activeIndex = 0;         else             activeIndex = Math.min(adapterIndex, adapterDataCount - 1);          releaseViews();         setSelection(activeIndex);     }      private class MyDataSetObserver extends DataSetObserver {         @Override         public void onChanged() {             onDataChanged();         }          @Override         public void onInvalidated() {             onDataChanged();         }     } }

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