android配合viewpager实现可滑动的标签栏示例分享
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package com.example.playtabtest.view;
import com.example.playtabtest.R;
import android.app.Activity;
import android.content.Context;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.LinearInterpolator;
import android.view.animation.TranslateAnimation;
import android.widget.HorizontalScrollView;
import android.widget.ImageView;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
public class SyncHorizontalScrollView extends HorizontalScrollView {
private View view;
private ImageView leftImage;
private ImageView rightImage;
private int windowWitdh = 0;
private Activity mContext;
private RadioGroup rg_nav_content;
private ImageView iv_nav_indicator;
private LayoutInflater mInflater;
private int indicatorWidth;// 每个标签所占的宽度
private int currentIndicatorLeft = 0;// 当前所在标签页面的位移
private ViewPager mViewPager;//与本view相关联的viewpager
public SyncHorizontalScrollView(Context context) {
super(context);
// TODO Auto-generated constructor stub
}
public SyncHorizontalScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
}
/**
*
* @param mViewPager与本view关联的viewpager
* @param leftImage左箭头
* @param rightImage右箭头
* @param tabTitle 标签数组，对应各个标签的名称
* @param count一页显示的标签数
* @param context
*/
public void setSomeParam(ViewPager mViewPager, ImageView leftImage,
ImageView rightImage, String[] tabTitle, int count, Activity context) {
this.mContext = context;
this.mViewPager = mViewPager;
mInflater = LayoutInflater.from(context);
this.view = mInflater.inflate(R.layout.sync_hsv_item, null);
this.addView(view);
this.leftImage = leftImage;
this.rightImage = rightImage;
DisplayMetrics dm = new DisplayMetrics();
context.getWindowManager().getDefaultDisplay().getMetrics(dm);
windowWitdh = dm.widthPixels;
indicatorWidth = windowWitdh / count;
init(tabTitle);
this.invalidate();
}
private void init(String[] tabTitle) {
rg_nav_content = (RadioGroup) view.findViewById(R.id.rg_nav_content);
iv_nav_indicator = (ImageView) view.findViewById(R.id.iv_nav_indicator);
initIndicatorWidth();
initNavigationHSV(tabTitle);
setListener();
}
// 初始化滑动下标的宽
private void initIndicatorWidth() {
ViewGroup.LayoutParams cursor_Params = iv_nav_indicator
.getLayoutParams();
cursor_Params.width = indicatorWidth;
iv_nav_indicator.setLayoutParams(cursor_Params);
}
// 添加顶部标签
private void initNavigationHSV(String[] tabTitle) {
rg_nav_content.removeAllViews();
for (int i = 0; i < tabTitle.length; i++) {
RadioButton rb = (RadioButton) mInflater.inflate(
R.layout.nav_radiogroup_item, null);
rb.setId(i);
rb.setText(tabTitle[i]);
rb.setLayoutParams(new LayoutParams(indicatorWidth,
LayoutParams.MATCH_PARENT));
rg_nav_content.addView(rb);
}
}
private void setListener() {
rg_nav_content
.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
if (rg_nav_content.getChildAt(checkedId) != null) {
TranslateAnimation animation = new TranslateAnimation(
currentIndicatorLeft,
((RadioButton) rg_nav_content
.getChildAt(checkedId)).getLeft(),
0f, 0f);
animation.setInterpolator(new LinearInterpolator());
animation.setDuration(100);
animation.setFillAfter(true);
// 执行位移动画
iv_nav_indicator.startAnimation(animation);
mViewPager.setCurrentItem(checkedId); // ViewPager
// 跟随一起 切换
// 记录当前 下标的距最左侧的 距离
currentIndicatorLeft = ((RadioButton) rg_nav_content
.getChildAt(checkedId)).getLeft();
smoothScrollTo(
(checkedId > 1 ? ((RadioButton) rg_nav_content
.getChildAt(checkedId)).getLeft()
: 0)
- ((RadioButton) rg_nav_content
.getChildAt(2)).getLeft(),
0);
}
}
});
}
/**
* 模拟点击事件，供外部调用
* @param position
*/
public void performLabelClick(int position) {
if (rg_nav_content != null && rg_nav_content.getChildCount() > position) {
((RadioButton) rg_nav_content.getChildAt(position)).performClick();
}
}
// 显示和隐藏左右两边的箭头
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
super.onScrollChanged(l, t, oldl, oldt);
if (!mContext.isFinishing() && view != null && rightImage != null
&& leftImage != null) {
if (view.getWidth() <= windowWitdh) {
leftImage.setVisibility(View.GONE);
rightImage.setVisibility(View.GONE);
} else {
if (l == 0) {
leftImage.setVisibility(View.GONE);
rightImage.setVisibility(View.VISIBLE);
} else if (view.getWidth() - l == windowWitdh) {
leftImage.setVisibility(View.VISIBLE);
rightImage.setVisibility(View.GONE);
} else {
leftImage.setVisibility(View.VISIBLE);
rightImage.setVisibility(View.VISIBLE);
}
}
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<RelativeLayout
android:id="@+id/rl_nav"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:background="#5AB0EB" >
<RadioGroup
android:id="@+id/rg_nav_content"
android:layout_width="fill_parent"
android:layout_height="38dip"
android:layout_alignParentTop="true"
android:background="#F2F2F2"
android:orientation="horizontal" >
</RadioGroup>
<ImageView
android:id="@+id/iv_nav_indicator"
android:layout_width="1dip"
android:layout_height="5dip"
android:layout_alignParentBottom="true"
android:background="#5AB0EB"
android:contentDescription="@string/nav_desc"
android:scaleType="matrix" />
</RelativeLayout>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<RadioButton xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="0dip"
android:layout_height="fill_parent"
android:background="#F2F2F2"
android:button="@null"
android:checked="true"
android:gravity="center"
android:text=""
android:textColor="@drawable/rb_blue_bg"
android:textSize="14.0dip" />