#Fragment 是3.0平板才引入进来的，3.0之后就加入了Fragment。原来是一个屏幕就是一个Activity，
>片段,碎片
1. 定义某一个片段的界面 继承Fragment类
public class BlueToothFragment extends Fragment {}
2. 重写Fragment里面的方法
显示Fragment的ui,把布局文件转化成view对象
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.blue_tooth_layout, null);
}
3. 获取Fragment管理器
fm = getFragmentManager();
4. 动态的修改界面
f1 = new BlueToothFragment();//先把要显示的f1new出来
FragmentTransaction ft = fm.beginTransaction();//开启事务
ft.replace(R.id.fl_container, f1);
ft.commit();//保证了 要么同时成功,要么同时失败
主页面：
<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:orientation="vertical" 垂直排列
tools:context=".MainActivity" >
<FrameLayout
android:id="@+id/fl_container"
android:layout_width="fill_parent"
android:layout_weight="1"
android:layout_height="0dip" >
</FrameLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#22000000"
android:orientation="horizontal" >
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="setting01"
android:text="蓝牙设置" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="setting02"
android:text="声音设置" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="setting03"
android:text="显示设置" />
</LinearLayout>
</LinearLayout>
3个fragment：
蓝牙fragment：
<?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" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="我是蓝牙设置"
android:textAppearance="?android:attr/textAppearanceLarge" />
<RadioButton
android:id="@+id/radioButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="RadioButton" />
<ToggleButton
android:id="@+id/toggleButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ToggleButton" />
</LinearLayout>
显示fragment：
<?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" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="我是显示设置"
android:textAppearance="?android:attr/textAppearanceLarge" />
<CheckBox
android:id="@+id/checkBox1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="CheckBox" />
<RadioButton
android:id="@+id/radioButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="RadioButton" />
</LinearLayout>
声音fragment：
<?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" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="我是声音设置"
android:textAppearance="?android:attr/textAppearanceLarge" />
<CheckBox
android:id="@+id/checkBox1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="CheckBox" />
</LinearLayout>
主Activity：
package com.itheima.fragementdemo;
import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.View;
public class MainActivity extends Activity {
private FragmentManager fm;//管理所有Fragment，更新页面的时候要么同时更新成功要么同时更新失败所以有事物，
BlueToothFragment f1;
ShowFragment f3;
SoundFragment f2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fm = getFragmentManager();
initFragment();
//事务的概念
FragmentTransaction ft = fm.beginTransaction();
ft.replace(R.id.fl_container, f1);
ft.commit();//保证了 要么同时成功,要么同时失败
}
private void initFragment() {
f1 = new BlueToothFragment();//Fragment是直接new出来的
f2 = new SoundFragment();
f3 = new ShowFragment();
}
//蓝牙点击事件
public void setting01(View view) {
//事物开始的时候实例化ft，事物结束的时候提交事物，提交后事物就过期了，所以每次都要初始化ft
FragmentTransaction ft = fm.beginTransaction();//
ft.replace(R.id.fl_container, f1);
ft.commit();//保证了 要么同时成功,要么同时失败，保证了页面不花屏。
}
//声音点击事件
public void setting02(View view) {
//事务的概念
FragmentTransaction ft = fm.beginTransaction();
ft.replace(R.id.fl_container, f2);
ft.commit();//保证了 要么同时成功,要么同时失败
}
//显示点击事件
public void setting03(View view) {
//事务的概念
FragmentTransaction ft = fm.beginTransaction();
ft.replace(R.id.fl_container, f3);
ft.commit();//保证了 要么同时成功,要么同时失败
}
}
3个fragment java代码
蓝牙：
package com.itheima.fragementdemo;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class BlueToothFragment extends Fragment {
//显示Fragment的ui的，不需要在清单文件配置任何内容
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.blue_tooth_layout, null);
}
}
声音
package com.itheima.fragementdemo;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class SoundFragment extends Fragment {
//显示Fragment的ui的
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.sound_layout, null);
}
}
显示
package com.itheima.fragementdemo;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class ShowFragment extends Fragment {
//显示Fragment的ui的
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.show_layout, null);
}
}
##Fragment的向下兼容，兼容低版本
>使用support-v4的jar包
>1. MainActivity extends FragmentActivity
>2. 所有的fragment的导包, android.support.v4.app.Fragment
>3. getSupportFragmentManager();
>4. 注意两个导包
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
package com.itheima.fragementdemo;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
public class MainActivity extends FragmentActivity {
private FragmentManager fm;
BlueToothFragment f1;
ShowFragment f3;
SoundFragment f2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//为了向下版本兼容采用v4包里面的FragmentManager
fm = getSupportFragmentManager();
initFragment();
//事务的概念
FragmentTransaction ft = fm.beginTransaction();
ft.replace(R.id.fl_container, f1);
ft.commit();//保证了 要么同时成功,要么同时失败
}
private void initFragment() {
f1 = new BlueToothFragment();
f2 = new SoundFragment();
f3 = new ShowFragment();
}
//蓝牙
public void setting01(View view) {
//事务的概念
FragmentTransaction ft = fm.beginTransaction();
ft.replace(R.id.fl_container, f1);
ft.commit();//保证了 要么同时成功,要么同时失败
}
//声音
public void setting02(View view) {
//事务的概念
FragmentTransaction ft = fm.beginTransaction();
ft.replace(R.id.fl_container, f2);
ft.commit();//保证了 要么同时成功,要么同时失败
}
//显示
public void setting03(View view) {
//事务的概念
FragmentTransaction ft = fm.beginTransaction();
ft.replace(R.id.fl_container, f3);
ft.commit();//保证了 要么同时成功,要么同时失败
}
}
时间： 2024-10-01 03:19:45