有這樣一個ListView,要求在屏幕底部有一個篩選排序的浮動框：
1、手指下拉隱藏，上滑顯示 ；
2、如果沒做任何操作，2S之后，要自動顯示；
3、滑動到最底部，始終顯示。
首先看其效果圖：
實現上述效果，其實現原理如下：
1、在屏幕頂部固定一個BottomView，XML布局最好使用RelativeLayout(底部的BottomView并不是 ListView的footView，這個是和footView獨立的，想想為什么？)
2、然后自定義ListView控件，監聽onTouchEvent事件，主要是監聽手指下滑和上滑事件，同時實現onScrollListener,監聽是否滑動到最底部和最頂部
3、 ListView監聽事件中，控制bottomView的顯示和隱藏，所以ListView提供一個接口，設置底部bootomView的內容，然后獲之后，就可以對bottomView進行控制，同時加上動畫效果。
接下來看是如何的具體實現這種效果：
1。底部BottomView的內容如下，這個XML文件的內容是自定義的，根據各項目的內容需求來定義的，我例子中bottom_view.xml:
<?xml version="1.0" encoding="UTF-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/button_layout" android:layout_width="fill_parent" android:layout_height="50dp" android:background="#cbcbcb" android:gravity="center_vertical" android:orientation="horizontal" > <Button android:layout_height="40dp" android:layout_width="wrap_content" android:layout_weight="1" android:text="價格" /> <Button android:layout_height="40dp" android:layout_width="wrap_content" android:layout_weight="1" android:text="好評" /> <Button android:layout_height="40dp" android:layout_width="wrap_content" android:layout_weight="1" android:text="篩選" /> </LinearLayout>
2、main.xml如下
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <com.example.BottomFloatListView.BottomFloatListView android:id="@+id/listView" android:layout_width="fill_parent" android:layout_height="fill_parent" android:fadingEdge="none" /> <include android:id="@+id/bottombar" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" layout="@layout/bottom_view" > </include> </RelativeLayout>
3、自定義ListView控件BottomFloatListView
package com.example.BottomFloatListView; import android.content.Context; import android.os.Handler; import android.util.AttributeSet; import android.util.Log; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.view.animation.Animation; import android.view.animation.OvershootInterpolator; import android.view.animation.TranslateAnimation; import android.widget.*; import android.widget.AbsListView.OnScrollListener; /** * 底部View自動隱藏和消失listview(其他ListView可以繼承該類，如CtripBottomRefreshListView類等) **/ public class BottomFloatListView extends ListView implements OnScrollListener { public View mBottomBar; private int mCurrentScrollState; private boolean bIsMoved = false; private boolean bIsDown = false; private int mDeltaY; private float mMotionY; private int oldFirstVisibleItem = 0; private Handler mHandler = new Handler(); private static final String TAG = "BottomFloatListView"; public BottomFloatListView(Context context) { this(context, null); super.setOnScrollListener(this); } public BottomFloatListView(Context context, AttributeSet attrs) { this(context, attrs, 0); super.setOnScrollListener(this); } public BottomFloatListView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); super.setOnScrollListener(this); } @Override public void setAdapter(ListAdapter adapter) { super.setAdapter(adapter); } @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { showBottomViewOnBottom(visibleItemCount, totalItemCount, firstVisibleItem); } @Override public void onScrollStateChanged(AbsListView view, int scrollState) { hideBottomViewOnScrollStateChanged(view, scrollState); } @Override public boolean onTouchEvent(MotionEvent ev) { float y = ev.getY(); float x = ev.getX(); Log.d("FloatListView", "onTouchEvent" + "" + x + "" + y); int action = ev.getAction() & MotionEvent.ACTION_MASK; switch (action) { case MotionEvent.ACTION_DOWN: action_down(y); break; case MotionEvent.ACTION_MOVE: mDeltaY = (int) (y - mMotionY); bIsMoved = true; //移動的時候，要移除掉顯示bottomView的消息 mHandler.removeCallbacks(showBottomBarRunnable); //補齊action_down事件，因為有的時候，action_down 事件沒有執行 action_down(y); break; case MotionEvent.ACTION_UP: bIsMoved = false; bIsDown = false; if (!bIsMoved && !bIsDown) { // 如果屏幕上什么沒做，則過2s之后要顯示bottomView mHandler.postDelayed(showBottomBarRunnable, 2000); } if (mDeltaY < 0) { //下滑影藏 hideBottomBar(); } else { //上滑顯示 showBottomBar(); } bIsMoved = false; break; } return super.onTouchEvent(ev); } private void action_down(float y){ mMotionY = y; bIsDown = true; Log.d(TAG, "action down execed"); mHandler.removeCallbacks(showBottomBarRunnable); } /** * 滑動到頂部時，要隱藏bottomView * @param view * @param scrollState */ private void hideBottomViewOnScrollStateChanged(AbsListView view, int scrollState) { mCurrentScrollState = scrollState; if(view!=null){ if (view.getFirstVisiblePosition() == 0 && scrollState == SCROLL_STATE_IDLE) { hideBottomBar(); Log.d(TAG, "hide bottom view"); } } } /** * 顯示底部浮動欄 */ public void showBottomBar() { if (mBottomBar != null && mBottomBar.getVisibility() == View.GONE) { mBottomBar.setVisibility(View.INVISIBLE); Animation translateAnimation = new TranslateAnimation(mBottomBar.getLeft(), mBottomBar.getLeft(),30, 0); translateAnimation.setDuration(300); translateAnimation.setInterpolator(new OvershootInterpolator(0.6f)); mBottomBar.startAnimation(translateAnimation); translateAnimation.setAnimationListener(new Animation.AnimationListener() { @Override public void onAnimationStart(Animation animation) { } @Override public void onAnimationRepeat(Animation animation) { } @Override public void onAnimationEnd(Animation animation) { mBottomBar.setVisibility(View.VISIBLE); } }); } } /** * 隱藏浮動底部欄 */ private void hideBottomBar() { if (mBottomBar != null && mBottomBar.getVisibility() == View.VISIBLE) { Animation translateAnimation = new TranslateAnimation(mBottomBar.getLeft(), mBottomBar.getLeft(), 0, 30); translateAnimation.setDuration(300); translateAnimation.setInterpolator(new OvershootInterpolator(0.6f)); mBottomBar.startAnimation(translateAnimation); translateAnimation.setAnimationListener(new Animation.AnimationListener() { @Override public void onAnimationStart(Animation animation) { } @Override public void onAnimationRepeat(Animation animation) { } @Override public void onAnimationEnd(Animation animation) { mBottomBar.setVisibility(View.GONE); } }); } } /** * 滑動到底部時直接顯示bottomView * @param visibleItemCount * @param totalItemCount * @param firstVisibleItem */ private void showBottomViewOnBottom(int visibleItemCount, int totalItemCount, int firstVisibleItem) { Log.d(TAG, "visible bottem item count:" + "firstVisibleItem:" + firstVisibleItem + "oldFirstVisibleItem:" + oldFirstVisibleItem + mBottomBar); if(getLastVisiblePosition() == totalItemCount -1 && mCurrentScrollState != SCROLL_STATE_IDLE){ showBottomBar(); } } private Runnable showBottomBarRunnable = new Runnable() { @Override public void run() { showBottomBar(); } }; /** * 將需要隱藏顯示的view傳入 * * @param bottomBar */ public void setBottomBar(ViewGroup bottomBar) { this.mBottomBar = bottomBar; } } 4、主界面測試的Activity，MainActivity代碼如下
public class MainActivity extends Activity { private BottomFloatListView mBottomFloatListView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mBottomFloatListView = (BottomFloatListView)findViewById(R.id.listView) ; mBottomFloatListView.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1,getData())); ViewGroup bottomView = (ViewGroup)findViewById(R.id.bottombar) ; mBottomFloatListView.setBottomBar(bottomView); } private List<String> getData(){ List<String> data = new ArrayList<String>(); for(int i = 0; i <100; i++) { data.add("測試數據" + i); } return data; } } ViewGroup bottomView = (ViewGroup)findViewById(R.id.bottombar) ; mBottomFloatListView.setBottomBar(bottomView);
將底部的bottomView傳入到ListView中，就可以讓ListView具有底部View自動隱藏和消失的功能。
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持武林網。
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