本文實例講述了Android編程使用LinearLayout和PullRefreshView實現上下翻頁功能的方法。分享給大家供大家參考，具體如下：
前看過網易云閱讀客戶端，里面的文章可以實現上下拉動實現上下翻頁的效果，感覺體驗效果很不錯。
公司新版本項目的開發中也要求實現類似的效果，不過還好項目需求里面可以提前知道需要實現上下拉動翻頁的總的頁數。如果像網易那種不提前知道總的頁數感覺控制好LinearLayout里面的childView應該也可以達到效果。
好記性不如爛筆頭，先寫下我提前知道總頁數實現上下拉翻頁的問題吧！
首先布局僅僅是一個簡單的LinearLayout包裹著
<LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/fenleiPullContentLayout" android:orientation="vertical"></LinearLayout>
然后通過一個for循環把PullRefreshView包裹進來
pullContentLayout.removeAllViews();pullViews.clear();for(int i=0;i<leftEntityData.size();i++){ PullToRefreshProView pullview = (PullToRefreshProView) inflater.inflate(R.layout.fenleipro_item, null); LayoutParams param = new LayoutParams(LayoutParams.MATCH_PARENT, scrollHeight); pullview.setLayoutParams(param); LinearLayout pullayout = (LinearLayout) pullview.findViewById(R.id.fenleirightlayout); RightAdapter adapter = new RightAdapter(rightEntityList.get(i)); pullayout.removeAllViews(); for(int k=0;k<adapter.getCount();k++){ View view = adapter.getView(k, null, null); pullayout.addView(view,k); } pullViews.add(pullview); pullContentLayout.addView(pullview, i); if(i==0){ pullview.setHeaderRefresh(false); pullview.setOnFooterRefreshListener(new MyOnRefreshListener(i)); }else if(i==leftEntityData.size()-1){ pullview.setFooterRefresh(false); pullview.setOnHeaderRefreshListener(new MyOnRefreshListener(i)); }else{ pullview.setOnHeaderRefreshListener(new MyOnRefreshListener(i)); pullview.setOnFooterRefreshListener(new MyOnRefreshListener(i)); }}代碼說明下：這里的PullToRefreshProView就是一個開源的下拉刷新控件，繼承的是一個LinearLayout實現的。網上有源碼；然后RightAdapter是一個BaseAdapter，通過這個adapter的getview得到每個view，然后把view添加到inflater出的PullToRefreshProView的子Linearlayoyut里面。然后給每個PullToRefreshProView設置上啦下拉的回調接口，第一個沒有上啦，最后個沒下拉。這里的MyOnRefreshListener是自己定義的下拉接口
private class MyOnRefreshListener implements OnHeaderRefreshListener,OnFooterRefreshListener{ @Override public void onFooterRefresh(PullToRefreshProView view) { } @Override public void onHeaderRefresh(PullToRefreshProView view) { }}然后再onFooter和onHeader里面寫下拉上拉邏輯。
這里關鍵是在動畫效果交互的實現。
上代碼，上拉的動畫
public class PullToRefreshUpAnimation extends Animation{ private View view1,view2; private int delt; private int topMarginView1 = 0; public PullToRefreshUpAnimation(Context context,View v1,View v2,int from,int to){ super(); view1 = v1; view2 = v2; delt = to - from; topMarginView1 = view1.getMeasuredHeight(); setDuration(450); setFillAfter(true); setInterpolator(new DecelerateInterpolator()); } public PullToRefreshUpAnimation(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub setDuration(450); setFillAfter(true); setInterpolator(new DecelerateInterpolator()); } @Override protected void applyTransformation(float interpolatedTime, Transformation t) { android.widget.LinearLayout.LayoutParams param = (android.widget.LinearLayout.LayoutParams)view2.getLayoutParams(); param.topMargin = (int) (interpolatedTime*delt); param.height = Math.abs(delt); android.widget.LinearLayout.LayoutParams param1 = (android.widget.LinearLayout.LayoutParams) view1.getLayoutParams(); param1.topMargin = (int) (topMarginView1*(interpolatedTime-1)); param1.height = topMarginView1; view1.setLayoutParams(param1); view2.setLayoutParams(param); } @Override public boolean willChangeBounds() { // TODO Auto-generated method stub return true; }}下拉動畫
public class PullToRefreshAnimation extends Animation{ private View view; private int delt; public PullToRefreshAnimation(Context context,View v,int from,int to){ super(); view = v; delt = to - from; setDuration(450); setFillAfter(true); setInterpolator(new DecelerateInterpolator()); } public PullToRefreshAnimation(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub setDuration(450); setFillAfter(true); setInterpolator(new DecelerateInterpolator()); } @Override protected void applyTransformation(float interpolatedTime, Transformation t) { android.widget.LinearLayout.LayoutParams param = (android.widget.LinearLayout.LayoutParams)view.getLayoutParams(); param.topMargin = (int) (interpolatedTime*delt); param.height = Math.abs(delt); param.width = android.widget.LinearLayout.LayoutParams.MATCH_PARENT; view.setLayoutParams(param); } @Override public boolean willChangeBounds() { // TODO Auto-generated method stub return true; }}這兩個動畫的后果是導致最后最外層的LinearLayout包裹的每個子LinearLayout改變了自己的height和topMargin，
所以需要給這個動畫設置animationListener，然后每次需要上啦下拉動畫前把LinearLayout的height和topMargin重新設置過來，具體怎么實現看具體情況。
PS：這里的核心實現方式其實就是控制好Linearlayout子LinearLayout的height和topMargin
希望本文所述對大家Android程序設計有所幫助。
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