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之後,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佈局最好使用Relati ...
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之後,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佈局最好使用RelativeLayout(底部的BottomView並不是 ListView的footView,這個是和footView獨立的,想想為什麼?)
2、然後自定義ListView控制項,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提供一個介面,設置底部bootomView的內容,然後獲之後,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控制項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) { // 如果屏幕上什麼沒做,則過2s之後要顯示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。