ViewPager是SDK自帶的可以控制界面滑動一個控件。現在可以上效果圖給大家看看。
效果就是如上圖一樣,可以左右滑動下面菜單欄可以改變顔色和微信有點相似。
1 布局的介紹
<LinearLayout 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"
android:background="@color/yinbaise"
android:orientation="vertical"
tools:context=".HomePageMenu" >
<android.support.v4.view.ViewPager
android:id="@+id/vp_content"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="0.40"
android:background="#ffffff" >
</android.support.v4.view.ViewPager>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/DarkGoldenrod1"
>
<TextView
android:id="@+id/functionone"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:text="首頁"
android:textSize="25dp"
android:textColor="@color/black" />
<TextView
android:id="@+id/functiontow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:textSize="25dp"
android:text="功能1"
android:textColor="@color/black" />
<TextView
android:id="@+id/functionthree"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:text="功能2"
android:textSize="25dp"
android:textColor="@color/black" />
<TextView
android:id="@+id/functionfour"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:textSize="25dp"
android:text="功能3"
android:textColor="@color/black" />
</LinearLayout>
</LinearLayout>
這布局就很簡單了,一眼就可以看清楚, 不過需要注意的是在布局中添加ViewPage的時候,在eclipse中并沒又找到,可能是我版本的問題或者是其他願意,我是直接手打或者複制進布局中就可以了。
2 四個功能菜單對應了4個fragment和4個布局檔案
fragment的布局檔案簡單這裡就不給代碼了,隻是給出fragment中添加布局檔案的相關代碼,如下:
package com.menu.showfrag;
import com.example.viewpagedemo.R;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class FunctionOne extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View view = View.inflate(getActivity(), R.layout.function1, null);
return view;
}
}
這裡的ViewPager滑動切換的是fragment,這樣就可以在fragment中去寫相關的邏輯代碼,邏輯很清楚友善。
3 mainactivity的布局已經給出現在來看,它的代碼:
package com.example.viewpagedemo;
import java.util.ArrayList;
import java.util.List;
import com.menu.showfrag.FunctionFour;
import com.menu.showfrag.FunctionOne;
import com.menu.showfrag.FunctionThree;
import com.menu.showfrag.FunctionTow;
import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;
@SuppressLint("ResourceAsColor")
public class MainActivity extends FragmentActivity implements OnClickListener {
// tyy 四個功能按鈕
TextView function_one, function_tow, function_three, function_four;
// tyy viewpager
ViewPager viewpager;
// tyy fragment 數組儲存fragment
List<Fragment> fm_list;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
function_one = (TextView) findViewById(R.id.functionone);
function_tow = (TextView) findViewById(R.id.functiontow);
function_three = (TextView) findViewById(R.id.functionthree);
function_four = (TextView) findViewById(R.id.functionfour);
viewpager = (ViewPager) findViewById(R.id.vp_content);
fm_list = new ArrayList<Fragment>();
fm_list.add(new FunctionOne());
fm_list.add(new FunctionTow());
fm_list.add(new FunctionThree());
fm_list.add(new FunctionFour());
function_one.setOnClickListener(this);
function_tow.setOnClickListener(this);
function_three.setOnClickListener(this);
function_four.setOnClickListener(this);
viewpager.setAdapter(new MenuApaper(getSupportFragmentManager()));
viewpager.setCurrentItem(0);// tyy 預設顯示第一個
function_one.setBackgroundResource(R.color.Orange);
// tyy 給viewpager添加監聽事件
viewpager.setOnPageChangeListener(new OnPageChangeListener() {
@Override
public void onPageSelected(int arg0) {
selectColor(arg0);
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageScrollStateChanged(int arg0) {
}
});
}
@SuppressLint("ResourceAsColor")
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.functionone:
viewpager.setCurrentItem(0);
break;
case R.id.functiontow:
viewpager.setCurrentItem(1);
break;
case R.id.functionthree:
viewpager.setCurrentItem(2);
break;
case R.id.functionfour:
viewpager.setCurrentItem(3);
break;
default:
break;
}
}
/**
* tyy 改變底部菜單顔色
*
* @param i是fragment的index
*/
private void selectColor(int i) {
// TODO Auto-generated method stub
switch (i) {
case 0:
function_one.setBackgroundResource(R.color.Orange);
function_tow.setBackgroundResource(R.color.DarkGoldenrod1);
function_three.setBackgroundResource(R.color.DarkGoldenrod1);
function_four.setBackgroundResource(R.color.DarkGoldenrod1);
break;
case 1:
function_one.setBackgroundResource(R.color.DarkGoldenrod1);
function_tow.setBackgroundResource(R.color.Orange);
function_three.setBackgroundResource(R.color.DarkGoldenrod1);
function_four.setBackgroundResource(R.color.DarkGoldenrod1);
break;
case 2:
function_one.setBackgroundResource(R.color.DarkGoldenrod1);
function_tow.setBackgroundResource(R.color.DarkGoldenrod1);
function_three.setBackgroundResource(R.color.Orange);
function_four.setBackgroundResource(R.color.DarkGoldenrod1);
break;
case 3:
function_one.setBackgroundResource(R.color.DarkGoldenrod1);
function_tow.setBackgroundResource(R.color.DarkGoldenrod1);
function_three.setBackgroundResource(R.color.DarkGoldenrod1);
function_four.setBackgroundResource(R.color.Orange);
break;
default:
break;
}
}
class MenuApaper extends FragmentPagerAdapter {
public MenuApaper(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// tyy 将fm_list中添加到了adapter中
return fm_list.get(position);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return fm_list.size();
}
}
}
這裡有幾點需要注意的是
a.給ViewPager添加adapter: viewpager.setAdapter(new MenuApaper(getSupportFragmentManager()));但是這裡的activity必須繼承FragmentActivity不然是找不到getSupportFragmentManager()這個方法的。
b.給ViewPager添加監聽事件,這樣可以來監聽滑動并且在相應的方法中處理事件。
附帶源碼:http://download.csdn.net/download/sky_918/9634600