/*Fragment 动态加载*/ MyFragment2 myFragment2=new MyFragment2();/*创建实例*/ FragmentManager fragmentManager = getFragmentManager();/*获取到FragmentManager*/ FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();/*开启事务*/ fragmentTransaction.add(R.id.frame,myFragment2); fragmentTransaction.addToBackStack(null);/*通过物理返回键返回*/ fragmentTransaction.commit();/*提交事务*/
主方法
package fragmentdemo.example.administrator.fragmentdemo;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.Intent;
import android.os.Bundle;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
/*1）Fragment可以作为Activity界面的一部分组成出现；
（2）可以在一个Activity中同时出现多个Fragment，并且一个Fragment也可以在多个Activity中使用；
（3）在Activity运行过程中，可以添加、移除或替换Fragment；
（4）Fragment可以响应自己的输入事件，并且有自己的声明周期，它们的生命周期受宿主Activity的生命周期影响；
（5）Fragment在第一次绘制它的用户界面时，系统会调用onCreateView()方法，此方法返回一个View。（如果不显示UI，返回null）；
Fragment两种加载方式：静态加载、动态加载。*/
public class MainActivity extends Activity implements OnCheckedChangeListener
{
private RadioGroup group;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
group = (RadioGroup) findViewById(R.id.radiogroup);
group.setOnCheckedChangeListener(this);
}
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
switch (checkedId) {
case R.id.first: {
Intent intent=new Intent(this,MainActivity2.class);
startActivity(intent);
break;
}
case R.id.second: {
/*Fragment 动态加载*/
MyFragment2 myFragment2=new MyFragment2();/*创建实例*/
FragmentManager fragmentManager = getFragmentManager();/*获取到FragmentManager*/
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();/*开启事务*/
fragmentTransaction.add(R.id.frame,myFragment2);
fragmentTransaction.addToBackStack(null);/*通过物理返回键返回*/
fragmentTransaction.commit();/*提交事务*/
break;
}
case R.id.thrid: {
Intent intent=new Intent(this,MainActivity3.class);
startActivity(intent);
break;
}
case R.id.fourth: {
Intent intent=new Intent(this,MainActivity4.class);
startActivity(intent);
break;
}
}
}
}
加载的main.xml布局，指定linerlayout的id
1 <?xml version="1.0" encoding="utf-8"?> 2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 3 android:layout_width="match_parent" 4 android:layout_height="match_parent" > 5 6 <LinearLayout 7 android:id="@+id/frame" 8 android:layout_width="match_parent" 9 android:layout_height="wrap_content" 10 android:orientation="vertical" > 11 </LinearLayout> 12 13 14 15 <RadioGroup 16 android:id="@+id/radiogroup" 17 android:layout_width="match_parent" 18 android:layout_height="wrap_content" 19 android:layout_alignParentBottom="true" 20 android:gravity="center_horizontal" 21 android:orientation="horizontal" > 22 23 <RadioButton 24 android:id="@+id/first" 25 android:layout_width="0dp" 26 android:layout_height="wrap_content" 27 android:layout_weight="1" 28 android:background="@drawable/radio_pressed" 29 android:button="@null" 30 android:drawableTop="@mipmap/ic_launcher" 31 android:gravity="center_horizontal" 32 android:text="静态加载" /> 33 34 <RadioButton 35 android:id="@+id/second" 36 android:layout_width="0dp" 37 android:layout_height="wrap_content" 38 android:layout_weight="1" 39 android:background="@drawable/radio_pressed" 40 android:button="@null" 41 android:drawableTop="@mipmap/ic_launcher" 42 android:gravity="center_horizontal" 43 android:text="动态加载" /> 44 45 <RadioButton 46 android:id="@+id/thrid" 47 android:layout_width="0dp" 48 android:layout_height="wrap_content" 49 android:layout_weight="1" 50 android:background="@drawable/radio_pressed" 51 android:button="@null" 52 android:drawableTop="@mipmap/ic_launcher" 53 android:gravity="center_horizontal" 54 android:text="生命周期" /> 55 56 <RadioButton 57 android:id="@+id/fourth" 58 android:layout_width="0dp" 59 android:layout_height="wrap_content" 60 android:layout_weight="1" 61 android:background="@drawable/radio_pressed" 62 android:button="@null" 63 android:drawableTop="@mipmap/ic_launcher" 64 android:gravity="center_horizontal" 65 android:text="传值通信" /> 66 </RadioGroup> 67 68 </RelativeLayout>
MyFragment2继承自Fragment
1 package fragmentdemo.example.administrator.fragmentdemo;
2
3 import android.app.Fragment;
4 import android.os.Bundle;
5 import android.support.annotation.Nullable;
6 import android.view.LayoutInflater;
7 import android.view.View;
8 import android.view.ViewGroup;
9 import android.widget.TextView;
10
11 /**
12 * Created by Administrator on 2016/5/6.
13 */
14 public class MyFragment2 extends Fragment{
15 @Nullable
16 @Override
17 public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
18 /*resource:Fragment需要加载的布局文件
19 root：加载layout中父ViewGroup
20 attachToRoot：false，不返回父ViewGroup*/
21 View view=inflater.inflate(R.layout.fragment,container,false);
22 TextView textView= (TextView) view.findViewById(R.id.text);
23 textView.setText("动态加载");
24 return view;
25
26 }
27 }
fragment.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">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/text"
/>
<Button
android:text="改变"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/button"/>
</LinearLayout>
时间： 2024-10-03 23:59:10