高仿网易新闻顶部滑动条效果实现代码

<?xmlversion="1.0"encoding="utf-8"?> 
<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android" 
android:id="@+id/root" 
android:background="#ffffff" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent"> 
<LinearLayout 
android:id="@+id/layoutBar" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:background="@drawable/big_button_up" 
android:orientation="horizontal"> 
<RelativeLayout 
android:id="@+id/layout1" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:layout_gravity="center_vertical" 
android:layout_weight="1.0"> 
<TextView 
android:id="@+id/tab1" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:layout_centerInParent="true" 
android:text="新闻"/> 
</RelativeLayout> 
<RelativeLayout 
android:id="@+id/layout2" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:layout_gravity="center_vertical" 
android:layout_weight="1.0"> 
<TextView 
android:id="@+id/tab2" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:layout_centerInParent="true" 
android:text="体育"/> 
</RelativeLayout> 
<RelativeLayout 
android:id="@+id/layout3" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:layout_gravity="center_vertical" 
android:layout_weight="1.0"> 
<TextView 
android:id="@+id/tab3" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:layout_centerInParent="true" 
android:text="娱乐"/> 
</RelativeLayout> 
<RelativeLayout 
android:id="@+id/layout4" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:layout_gravity="center_vertical" 
android:layout_weight="1.0"> 
<TextView 
android:id="@+id/tab4" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:layout_centerInParent="true" 
android:text="更多"/> 
</RelativeLayout> 
</LinearLayout> 
<LinearLayout 
android:id="@+id/page" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:layout_alignParentLeft="true" 
android:layout_below="@+id/layoutBar" 
android:background="#ffffff" 
android:orientation="vertical" 
> 
</LinearLayout> 
</RelativeLayout> 

packagecn.com.karl.slider; 
importandroid.app.Activity; 
importandroid.os.Bundle; 
importandroid.view.Gravity; 
importandroid.view.LayoutInflater; 
importandroid.view.View; 
importandroid.view.View.OnClickListener; 
importandroid.view.ViewGroup.LayoutParams; 
importandroid.view.animation.TranslateAnimation; 
importandroid.widget.LinearLayout; 
importandroid.widget.RelativeLayout; 
importandroid.widget.TextView; 
publicclassSliderBarActivityextendsActivity{ 
/**Calledwhentheactivityisfirstcreated.*/ 
privateRelativeLayoutlayout; 

privateRelativeLayoutlayout1; 
privateRelativeLayoutlayout2; 
privateRelativeLayoutlayout3; 
privateRelativeLayoutlayout4; 
privateTextViewtab1; 
privateTextViewtab2; 
privateTextViewtab3; 
privateTextViewtab4; 
privateTextViewfirst; 
privateintcurrent=1; 

privateLinearLayoutpage; 

privatebooleanisAdd=false; 
privateintselect_width; 
privateintselect_height; 
privateintfirstLeft; 
privateintstartLeft; 

@Override 
publicvoidonCreate(BundlesavedInstanceState){ 
super.onCreate(savedInstanceState); 
setContentView(R.layout.main); 
init(); 
} 
privatevoidinit(){ 
layout=(RelativeLayout)findViewById(R.id.root); 

layout1=(RelativeLayout)findViewById(R.id.layout1); 
layout2=(RelativeLayout)findViewById(R.id.layout2); 
layout3=(RelativeLayout)findViewById(R.id.layout3); 
layout4=(RelativeLayout)findViewById(R.id.layout4); 

page=(LinearLayout)this.findViewById(R.id.page); 

tab1=(TextView)findViewById(R.id.tab1); 
tab1.setOnClickListener(onClickListener); 
tab2=(TextView)findViewById(R.id.tab2); 
tab2.setOnClickListener(onClickListener); 
tab3=(TextView)findViewById(R.id.tab3); 
tab3.setOnClickListener(onClickListener); 
tab4=(TextView)findViewById(R.id.tab4); 
tab4.setOnClickListener(onClickListener); 



RelativeLayout.LayoutParamsrl=newRelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT); 
rl.addRule(RelativeLayout.CENTER_IN_PARENT,RelativeLayout.TRUE); 
first=newTextView(this); 
first.setTag("first"); 
first.setGravity(Gravity.CENTER); 
first.setBackgroundResource(R.drawable.slidebar); 
first.setText(tab1.getText()); 
Viewview1=LayoutInflater.from(getApplicationContext()).inflate(R.layout.page1,null); 
page.addView(view1); 

switch(current){ 
case1: 
layout1.addView(first,rl); 
current=R.id.tab1; 
break; 
case2: 
layout2.addView(first,rl); 
current=R.id.tab2; 
break; 
case3: 
layout3.addView(first,rl); 
current=R.id.tab3; 
break; 
case4: 
layout4.addView(first,rl); 
current=R.id.tab4; 
break; 
default: 
break; 
} 

} 

privatevoidreplace(){ 
switch(current){ 
caseR.id.tab1: 
changeTop(layout1); 
break; 
caseR.id.tab2: 
changeTop(layout2); 
break; 
caseR.id.tab3: 
changeTop(layout3); 
break; 
caseR.id.tab4: 
changeTop(layout4); 
break; 
default: 
break; 
} 
} 
privatevoidchangeTop(RelativeLayoutrelativeLayout){ 
TextViewold=(TextView)relativeLayout.findViewWithTag("first");; 
select_width=old.getWidth(); 
select_height=old.getHeight(); 

RelativeLayout.LayoutParamsrl=newRelativeLayout.LayoutParams(select_width,select_height); 
rl.leftMargin=old.getLeft()+((RelativeLayout)old.getParent()).getLeft(); 
rl.topMargin=old.getTop()+((RelativeLayout)old.getParent()).getTop(); 

firstLeft=old.getLeft()+((RelativeLayout)old.getParent()).getLeft(); 

TextViewtv=newTextView(this); 
tv.setTag("move"); 
tv.setBackgroundResource(R.drawable.slidebar); 

layout.addView(tv,rl); 
relativeLayout.removeView(old); 
} 

privateOnClickListeneronClickListener=newOnClickListener(){ 
publicvoidonClick(Viewv){ 
if(!isAdd){ 
replace(); 
isAdd=true; 
} 

TextViewtop_select=(TextView)layout.findViewWithTag("move"); 
top_select.setGravity(Gravity.CENTER); 
top_select.setText(tab1.getText()); 
inttabLeft; 
intendLeft=0; 

booleanrun=false; 
switch(v.getId()){ 
caseR.id.tab1: 
if(current!=R.id.tab1){ 
page.removeAllViews(); 
tabLeft=((RelativeLayout)tab1.getParent()).getLeft()+tab1.getLeft()+tab1.getWidth()/2; 
endLeft=tabLeft-select_width/2; 
current=R.id.tab1; 
top_select.setText(tab1.getText()); 
run=true; 
Viewview1=LayoutInflater.from(getApplicationContext()).inflate(R.layout.page1,null); 
page.addView(view1); 
} 
break; 
caseR.id.tab2: 
if(current!=R.id.tab2){ 
page.removeAllViews(); 
tabLeft=((RelativeLayout)tab2.getParent()).getLeft()+tab2.getLeft()+tab2.getWidth()/2; 
endLeft=tabLeft-select_width/2; 
current=R.id.tab2; 
top_select.setText(tab2.getText()); 
run=true; 
Viewview2=LayoutInflater.from(getApplicationContext()).inflate(R.layout.page2,null); 
page.addView(view2); 
} 
break; 
caseR.id.tab3: 
if(current!=R.id.tab3){ 
page.removeAllViews(); 
tabLeft=((RelativeLayout)tab3.getParent()).getLeft()+tab3.getLeft()+tab3.getWidth()/2; 
endLeft=tabLeft-select_width/2; 
current=R.id.tab3; 
top_select.setText(tab3.getText()); 
run=true; 
Viewview3=LayoutInflater.from(getApplicationContext()).inflate(R.layout.page3,null); 
page.addView(view3); 
} 
break; 
caseR.id.tab4: 
if(current!=R.id.tab4){ 
page.removeAllViews(); 
tabLeft=((RelativeLayout)tab4.getParent()).getLeft()+tab3.getLeft()+tab4.getWidth()/2; 
endLeft=tabLeft-select_width/2; 
current=R.id.tab4; 
top_select.setText(tab4.getText()); 
run=true; 
Viewview4=LayoutInflater.from(getApplicationContext()).inflate(R.layout.page4,null); 
page.addView(view4); 
} 
break; 
default: 
break; 
} 

if(run){ 
TranslateAnimationanimation=newTranslateAnimation(startLeft,endLeft-firstLeft,0,0); 
startLeft=endLeft-firstLeft; 
animation.setDuration(100); 
animation.setFillAfter(true); 
top_select.bringToFront(); 
top_select.startAnimation(animation); 

} 

} 
}; 
}