对于Android中横竖屏的切换，当从竖屏切换到横屏时，竖屏的Activity会销毁，会加载横屏时的Activity。下面的实例就是我们在
切换横竖屏时让页面加载不同的布局内容。
在res文件夹下新建文件夹：layout-land，这里面的布局文件是我们把手机切换到横屏时加载到Activity中的内容。
这里我们先写一下竖屏时加载的内容：
activity-main.xml文件：
<RelativeLayout 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" >
<LinearLayout
android:id="@+id/layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="10dp" >
<TextView
android:id="@+id/tvTou"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:clickable="true"
android:gravity="center"
android:text="头条" />
<TextView
android:id="@+id/tvKe"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:clickable="true"
android:gravity="center"
android:text="科技" />
<TextView
android:id="@+id/tvTi"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:clickable="true"
android:gravity="center"
android:text="体育" />
</LinearLayout>
<fragment
android:id="@+id/fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@id/layout"
class="com.example.text01.BottomFragment" />
</RelativeLayout>package com.example.text01;
import android.os.Bundle;
import android.app.Activity;
import android.content.res.Configuration;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;
/**
* 点击TextView将TextView的文本值--》传递到Fragment
*
* @author Administrator
*
*/
public class MainActivity extends Activity implements OnClickListener {
private BottomFragment fragment;
private TextView tvTT, tvKJ, tvTY;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 当我们切换到横屏时，就会自动加载layout-land文件夹下的布局
setContentView(R.layout.activity_main);
initData();
}
/**
* 初始化监听
*/
private void initListener() {
tvTT.setOnClickListener(this);
tvKJ.setOnClickListener(this);
tvTY.setOnClickListener(this);
}
/**
* 初始化数据
*/
private void initData() {
// 判断屏幕方向，横屏时加载的布局文件
if (isScrennLand()) {
tvTT = (TextView) findViewById(R.id.tvTou);
tvKJ = (TextView) findViewById(R.id.tvKe);
tvTY = (TextView) findViewById(R.id.tvTi);
// 用我们布局文件中的fragment给我们创建的Fragment的子类实例化
fragment = (BottomFragment) getFragmentManager().findFragmentById(
R.id.fragment);
initListener();
}
}
/**
* 判断屏幕方向
*
* @return
*/
private boolean isScrennLand() {
// 横屏
if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
return true;
}
return false;
}
/**
* 设置TextView的监听事件
*/
@Override
public void onClick(View v) {
String content = "";
switch (v.getId()) {
case R.id.tvTou:
content = tvTT.getText().toString();
break;
case R.id.tvKe:
content = tvKJ.getText().toString();
break;
case R.id.tvTi:
content = tvTY.getText().toString();
break;
default:
break;
}
fragment.getContent(content);
}
}package com.example.text01;
import java.util.ArrayList;
import java.util.List;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ListView;
public class BottomFragment extends Fragment {
private ListView lv;
private List<String> lists = new ArrayList<String>();
private ArrayAdapter<String> adapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment, null);
lv = (ListView) view.findViewById(R.id.lv);
initData("头条");
adapter = new ArrayAdapter<String>(getActivity(),
android.R.layout.simple_list_item_1, lists);
lv.setAdapter(adapter);
return view;
}
// 初始化数据
public void initData(String data) {
// 用来填充数据
for (int i = 0; i < 20; i++) {
lists.add(data + " " + i);
}
}
public void getContent(String content) {
lists.clear();
initData(content);
// 刷新适配器
adapter.notifyDataSetChanged();
}
}
二、上面这些是竖屏时加载的布局，下面我们把屏幕切换到横屏，然后当前的Activity会被销毁，会加载我们layout-land文件夹
中的布局。
layout-land文件夹中的xml文件：
<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" >
<fragment
android:id="@+id/left_fragment"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
class="com.example.text01.LeftFragment" />
<fragment
android:id="@+id/right_fragment"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="3"
class="com.example.text01.RightFragment" />
</LinearLayout>下面我们创建两个Fragment的子类：
LeftFragment：
package com.example.text01;
import java.util.ArrayList;
import java.util.List;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class LeftFragment extends Fragment {
private String[] titles;
private ListView lv;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.left, null);
titles = getResources().getStringArray(R.array.title);//引用我们定义的数组资源
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(),
android.R.layout.simple_list_item_1, titles);
lv = (ListView) view.findViewById(R.id.lv_left);
lv.setAdapter(adapter);
//设置ListView的监听
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// 得到右边的ListView
ListView rightListView = (ListView) getActivity().findViewById(
R.id.lv_right);
String content = titles[position];
List<String> lists = new ArrayList<String>();
for (int i = 0; i < 15; i++) {
lists.add(content + " " + i);
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(
getActivity(), android.R.layout.simple_list_item_1,
lists);
rightListView.setAdapter(adapter);
}
});
return view;
}
}package com.example.text01;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class RightFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.right, null);
return view;
}
}下面是运行结果：
