ViewPager 切换页面
package com.gaoo.apptab;
/**
* ViewPager 实现tab
*
* 代码中存在一个小问题: 点击底部导航栏时,点击下面的文字没有问题可以正常切换,而点击标签文字上方的图片就不能实现正常切换了,这是为什么?
* 因为我们在底部导航栏 4个 LinearLayout 布局中 图片的展示的控件是 ImageButton ,而它本身具备消费点击事件的能力,自己把点击事件消费掉了,
* 而我们这里的ImageButton 没有实现点击事件,所以就不能切换.
* 从而导致最外层的 LinearLayout 不能响应点击事件.
*
* 我们该怎么解决呢? 只要在 ImageButton控件 设置属性 android:clickable="false",
* 让它不能点击不去消费事件,把点击事件的消费者变成 LinearLayout 即可.
*
*/
public class MainActivity extends Activity implements View.OnClickListener {
private ViewPager mViewPager;
private PagerAdapter mAdapter;
private List mViewList = new ArrayList<>();
//导航栏 tab
private LinearLayout mTabWeixin;
private LinearLayout mTabFriend;
private LinearLayout mTabAddress;
private LinearLayout mTabSetting;
private ImageButton mWeixinImg;
private ImageButton mFriendImg;
private ImageButton mAddressImg;
private ImageButton mSettingImg;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
initView(); //初始化控件
initEvents(); //初始化事件
}
private void initEvents() {
mTabWeixin.setOnClickListener(this);
mTabFriend.setOnClickListener(this);
mTabAddress.setOnClickListener(this);
mTabSetting.setOnClickListener(this);
//mViewPager.setOnPageChangeListener(); 该方法已经废弃, 用下面的方法 代替
mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
int currentItem = mViewPager.getCurrentItem(); //获取当前显示页面
resetImg(); //重置所有的状态 为灰色(为选中状态)
switch (position){
case 0:
mWeixinImg.setImageResource(R.drawable.tab_weixin_pressed);
break;
case 1:
mFriendImg.setImageResource(R.drawable.tab_find_frd_pressed);
break;
case 2:
mAddressImg.setImageResource(R.drawable.tab_address_pressed);
break;
case 3:
mSettingImg.setImageResource(R.drawable.tab_settings_pressed);
break;
}
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
private void initView() {
mViewPager = (ViewPager) findViewById(R.id.id_viewPager);
mTabWeixin = (LinearLayout) findViewById(R.id.id_tab_weixin);
mTabFriend = (LinearLayout) findViewById(R.id.id_tab_friend);
mTabAddress = (LinearLayout) findViewById(R.id.id_tab_address);
mTabSetting = (LinearLayout) findViewById(R.id.id_tab_setting);
mWeixinImg = (ImageButton) findViewById(R.id.id_tab_weixin_img);
mFriendImg = (ImageButton) findViewById(R.id.id_tab_friend_img);
mAddressImg = (ImageButton) findViewById(R.id.id_tab_address_img);
mSettingImg = (ImageButton) findViewById(R.id.id_tab_setting_img);
//填充4个布局界面
LayoutInflater inflater = LayoutInflater.from(this);
View tab01 = inflater.inflate(R.layout.tab01, null);
View tab02 = inflater.inflate(R.layout.tab02, null);
View tab03 = inflater.inflate(R.layout.tab03, null);
View tab04 = inflater.inflate(R.layout.tab04, null);
mViewList.add(tab01);
mViewList.add(tab02);
mViewList.add(tab03);
mViewList.add(tab04);
mAdapter = new PagerAdapter() {
@Override //获取view的数量
public int getCount() {
return mViewList.size();
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == (View) object;
}
@Override //初始化 view
public Object instantiateItem(ViewGroup container, int position) {
View view = mViewList.get(position);
container.addView(view);
return view;
}
@Override //销毁view
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView(mViewList.get(position));
}
};
mViewPager.setAdapter(mAdapter);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.id_tab_weixin:
mViewPager.setCurrentItem(0);
mWeixinImg.setImageResource(R.drawable.tab_weixin_pressed);
break;
case R.id.id_tab_friend:
mViewPager.setCurrentItem(1);
mFriendImg.setImageResource(R.drawable.tab_find_frd_pressed);
break;
case R.id.id_tab_address:
mViewPager.setCurrentItem(2);
mAddressImg.setImageResource(R.drawable.tab_address_pressed);
break;
case R.id.id_tab_setting:
mViewPager.setCurrentItem(3);
mSettingImg.setImageResource(R.drawable.tab_settings_pressed);
break;
}
}
/**
* 将所有的图片设置为 未选中状态(灰色状态)
*/
public void resetImg() {
mWeixinImg.setImageResource(R.drawable.tab_weixin_normal);
mFriendImg.setImageResource(R.drawable.tab_find_frd_normal);
mAddressImg.setImageResource(R.drawable.tab_address_normal);
mSettingImg.setImageResource(R.drawable.tab_settings_normal);
}
}
布局界面 底部导航栏主要是采用 了一个水平的LinearLayout包裹了4个垂直的 LinearLayout. 这里有一点需要注意,就是对ImageButton的点击事件设置成了 false android:clickable=”false”.
bottom.xml (底部导航栏)
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="65dp"
android:background="@drawable/bottom_bar"
android:orientation="horizontal">
<LinearLayout
android:id="@+id/id_tab_weixin"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical">
<ImageButton
android:id="@+id/id_tab_weixin_img"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#00000000"
android:clickable="false"
android:src="@drawable/tab_weixin_pressed"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="微信"
android:textColor="#fff"/>
LinearLayout>
<LinearLayout
android:id="@+id/id_tab_friend"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical">
<ImageButton
android:id="@+id/id_tab_friend_img"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#00000000"
android:clickable="false"
android:src="@drawable/tab_find_frd_normal"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="朋友"
android:textColor="#fff"/>
LinearLayout>
<LinearLayout
android:id="@+id/id_tab_address"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical">
<ImageButton
android:id="@+id/id_tab_address_img"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#00000000"
android:clickable="false"
android:src="@drawable/tab_address_normal"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="通讯录"
android:textColor="#fff"/>
LinearLayout>
<LinearLayout
android:id="@+id/id_tab_setting"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical">
<ImageButton
android:id="@+id/id_tab_setting_img"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#00000000"
android:clickable="false"
android:src="@drawable/tab_settings_normal"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="设置"
android:textColor="#fff"/>
LinearLayout>
LinearLayout>顶部界面 ( top.xml )
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="45dp"
android:background="@drawable/title_bar"
android:gravity="center"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="微信"
android:textColor="#ffffff"
android:textSize="20sp"
android:textStyle="bold"/>
LinearLayout>主界面布局文件
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<include layout="@layout/top"/>
<android.support.v4.view.ViewPager
android:id="@+id/id_viewPager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
/>
<include layout="@layout/bottom" />
LinearLayout>
项目中图片资源下载 密码:eql9