重写ScrollView实现ScrollView可以添加悬浮条

来源：互联网发布：维控触摸屏编程教程编辑：程序博客网时间：2024/06/05 17:36

step1：

先看下效果

step2：

View

/**@author by LinWill at 2016/7/2 * @version 0.1 * @category 可以设置悬浮窗口的ScrollView */public class FloatScrollView extends ScrollView {LinearLayout layoutNormal,layoutFloat;View floatView;public FloatScrollView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);}public FloatScrollView(Context context, AttributeSet attrs) {super(context, attrs);}public FloatScrollView(Context context) {super(context);}/** * 设置浮动窗口。 * @param layoutNormal 正常状态下悬浮窗的父容器 * @param layoutFloat  置顶状态下悬浮车的父容器 * @param floatView    需要悬浮的窗口 * */public void setFloatView(LinearLayout layoutNormal,LinearLayout layoutFloat,View floatView){this.layoutNormal=layoutNormal;this.layoutFloat =layoutFloat ;this.floatView   =floatView   ;}/**检查状态，执行对应改变。 * @param scrollY scrollView当前scroll位置 * @param isUp 当前是否向上滚动 * */private void changFloatView(int scrollY,boolean isUp){//检查是否执行过setFloatView方法if(null==floatView||null==layoutNormal||null==layoutFloat){return;}//改变状态的位置。int scrollChang=layoutNormal.getTop();if(isUp){//scrollView向上滚动，scrollY小于改变位置是设置FloatView置顶if(!(scrollY <=scrollChang)){setFloatView(true);}}else{//scrollView向下滚动，scrollY小于改变位置是设置FloatView置顶if((scrollY <=scrollChang)){setFloatView(false);}}}/** * 改变悬浮窗的状态 * @param isFloat 是否悬浮 * */private void setFloatView(boolean isFloat){if(isFloat){//悬浮置顶if (floatView.getParent()!=layoutFloat) {        layoutNormal.removeView(floatView);        layoutFloat .addView   (floatView);}}else{//正常if (floatView.getParent()!=layoutNormal) {layoutFloat .removeView(floatView);layoutNormal.addView   (floatView);}}}@Overrideprotected void onScrollChanged(int l, int t, int oldl, int oldt) {super.onScrollChanged(l, t, oldl, oldt);//判断ScrollView是否向上移动if(t>oldt){changFloatView(t,true);}else{changFloatView(t,false);}}}

step3：

Xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="xyz.linwill.ScrollViewDemo.MainActivity" >    <xyz.linwill.ScrollViewDemo.View.FloatScrollView         android:id="@+id/scrollview"        android:layout_width="match_parent"        android:layout_height="match_parent">        <LinearLayout             android:layout_width="match_parent"            android:layout_height="wrap_content"            android:gravity="center"            android:orientation="vertical">            <TextView                 android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:textSize="30sp"                android:text="1\n2\n3\n4\n5\n上\n山\n打\n老\n虎"/>            <LinearLayout                 android:id="@+id/layout_normal"                android:layout_width="match_parent"                android:layout_height="30dip"                android:orientation="vertical">                <!-- 正常状态下悬浮窗口的容器 -->                <LinearLayout                     android:id="@+id/floatview"                    android:layout_width="match_parent"                    android:layout_height="30dip"                    android:gravity="center"                    android:background="#fae">                    <TextView                         android:id="@+id/text_1"                        android:layout_width="0dp"                        android:layout_height="30dip"                        android:layout_weight="1"                        android:text="选项卡1"                        android:gravity="center"                        android:layout_marginLeft="5dp"                        android:layout_marginRight="5dp"                        android:background="#99f1a441"/>                    <TextView                         android:id="@+id/text_2"                        android:layout_width="0dp"                        android:layout_height="30dip"                        android:layout_weight="1"                        android:text="选项卡2"                        android:gravity="center"                        android:layout_marginLeft="5dp"                        android:layout_marginRight="5dp"                        android:background="#99f1a441"/>                    <TextView                         android:id="@+id/text_3"                        android:layout_width="0dp"                        android:layout_height="30dip"                        android:layout_weight="1"                        android:text="选项卡3"                        android:gravity="center"                        android:layout_marginLeft="5dp"                        android:layout_marginRight="5dp"                        android:background="#99f1a441"/>                                    </LinearLayout>                           </LinearLayout>             <TextView                 android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:textSize="30sp"                android:text="楼\n主\n已\n经\n被\n老\n虎\n咬\n死\n了\n，\n大\n家\n头\n七\n再\n来\n看\n楼\n主\n！"/>        </LinearLayout>    </xyz.linwill.ScrollViewDemo.View.FloatScrollView>    <LinearLayout         android:id="@+id/layout_float"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="vertical">        <!-- 置顶状态下悬浮窗口的容器 -->    </LinearLayout> </RelativeLayout>

step4：

Activity

public class MainActivity extends Activity {LinearLayout layoutNormal,layoutFloat;LinearLayout floatView;FloatScrollView ScrollView;TextView t1,t2,t3;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ScrollView   =(FloatScrollView) findViewById(R.id.scrollview   );layoutNormal =(LinearLayout)    findViewById(R.id.layout_normal);layoutFloat  =(LinearLayout)    findViewById(R.id.layout_float );floatView    =(LinearLayout)    findViewById(R.id.floatview    );t1           =(TextView)        findViewById(R.id.text_1       );t2           =(TextView)        findViewById(R.id.text_2       );t3           =(TextView)        findViewById(R.id.text_3       );ScrollView.setFloatView(layoutNormal, layoutFloat, floatView);t1.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {Toast.makeText(MainActivity.this, "t1选中", Toast.LENGTH_SHORT).show();}});t2.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {Toast.makeText(MainActivity.this, "t2选中", Toast.LENGTH_SHORT).show();}});t3.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {Toast.makeText(MainActivity.this, "t3选中", Toast.LENGTH_SHORT).show();}});}}

step5：

附上源码 http://download.csdn.net/detail/qq_32182845/9565656

第一次写博客，如有不对的地方请大牛们指正！

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