效果圖:
之前寫了一個基于ViewPager+Fragment實作的Tabhost(具體詳情:
http://blog.csdn.net/zhangphil/article/details/43700807),但寫的過于緊耦合,不便于複用。現在大規模重新整理重寫了項目部分代碼,便于以後再工程中複用。
主要重寫了幾個方法,供以後使用重寫:
protected Fragment getFragmentAt(int pos) {
return null;
}
protected View getIndicatorAt(int pos) {
return null;
}
protected int getItemsCount() {
return 0;
}
其中:
protected Fragment getFragmentAt(int pos) {
return null;
}
是ViewPager中每個單獨的Page(該Page加載的Fragment)
相應的,一個Page(加載Fragment)對應一個下方Tab的頁籤:
protected View getIndicatorAt(int pos) {
return null;
}
以下是完整的項目代碼:
重新命名該ViewPager+Fragment實作的“Tabhost”為 ViewPagerTabHost。
ViewPagerTabHost.java代碼:
package zhangphil.libs.view;
import zhangphil.libs.R;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
public class ViewPagerTabHost extends Fragment {
private MyFragmentPagerAdapter mPagerAdapter;
private ViewPager mViewPager;
private LinearLayout mLinearLayout;
protected Fragment getFragmentAt(int pos) {
return null;
}
protected View getIndicatorAt(int pos) {
return null;
}
protected int getItemsCount() {
return 0;
}
public void notifyDataSetChanged() {
mPagerAdapter.notifyDataSetChanged();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View mView = inflater.inflate(R.layout.viewpager_tabhost, null);
mViewPager = (ViewPager) mView.findViewById(R.id.viewpager);
mLinearLayout = (LinearLayout) mView
.findViewById(R.id.indicator_LinearLayout);
addIndicators();
// 初始化,第一項被選中
setIndicatorViewSelected(0);
mPagerAdapter = new MyFragmentPagerAdapter(getFragmentManager());
mViewPager.setAdapter(mPagerAdapter);
mViewPager
.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageSelected(int pos) {
setIndicatorViewSelected(pos);
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageScrollStateChanged(int arg0) {
}
});
return mView;
}
private void addIndicators() {
// 添加Tab頁籤
for (int i = 0; i < getItemsCount(); i++) {
View v = getIndicatorAt(i);
addIndicatorItem(v, i);
}
}
private void addIndicatorItem(View view, final int index) {
LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.MATCH_PARENT, 1);
mLinearLayout.addView(view, index, params);
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
set(index);
}
});
}
// 在這裡設定被選中時候頁籤變化的效果
private void setIndicatorViewSelected(int pos) {
for (int i = 0; i < mLinearLayout.getChildCount(); i++) {
if (i == pos) {
View v = mLinearLayout.getChildAt(i);
v.setBackgroundColor(Color.RED);
} else {
View v = mLinearLayout.getChildAt(i);
v.setBackgroundColor(Color.GRAY);
}
}
}
private void set(int pos) {
mViewPager.setCurrentItem(pos, true);
setIndicatorViewSelected(pos);
}
private class MyFragmentPagerAdapter extends FragmentPagerAdapter {
public MyFragmentPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int pos) {
return getFragmentAt(pos);
}
@Override
public int getCount() {
return getItemsCount();
}
@Override
public void notifyDataSetChanged() {
super.notifyDataSetChanged();
// addIndicators();
}
}
}
需要的布局檔案 viewpager_tabhost.xml :
<?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"
>
<FrameLayout
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</FrameLayout>
<LinearLayout
android:id="@+id/indicator_LinearLayout"
android:layout_width="match_parent"
android:layout_height="50dip"
android:orientation="horizontal" >
</LinearLayout>
</LinearLayout>
viewpager_tabhost.xml可以在以後的實際項目中再次定制。