Android UI编程(8)——动态加载Fragment

通过动态加载fragment实现在一个Activity拥有3种不同的布局，直接看效果图吧：

常规模式下：

点击家居控制：

代码：

AndroidManifest.xml——没有做任何修改，创建工程默认

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.wxl.fragment"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="19" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.wxl.fragment.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

fragment1.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"
    android:background="#ffcccc"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/fragment1_textView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:text="第一个Fragment界面"
        android:textSize="50sp"/>

</LinearLayout>

fragment2.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"
    android:background="#00ffff"
    android:orientation="vertical" >

	<TextView
        android:id="@+id/fragment2_textView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:text="第二个Fragment界面"
        android:textSize="50sp"/>    

</LinearLayout>

fragment3.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"
    android:background="#ffff00"
    android:orientation="vertical" >

	<TextView
        android:id="@+id/fragment2_textView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:text="第三个Fragment界面"
        android:textSize="50sp"/>    

</LinearLayout>

activity_main.xml

<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"
    android:background="#000000"
    android:id="@+id/main">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="80dp"
        android:background="@drawable/main_menu_bk"
        android:orientation="vertical" >
        <!-- android:splitMotionEvents="false"多个view是否分流touch 事件 -->
        <LinearLayout
	        android:layout_width="wrap_content"
	        android:layout_height="match_parent"
	        android:orientation="horizontal"
	        android:layout_centerHorizontal="true"
	        android:splitMotionEvents="false">
	        <LinearLayout
	            android:id="@+id/menu_1"
	            android:layout_width="250dp"
	            android:layout_height="match_parent"
	            android:orientation="vertical" >
	            <TextView
	                android:id="@+id/textView1"
	                android:layout_width="wrap_content"
	                android:layout_height="match_parent"
	                android:layout_gravity="center"
	                android:gravity="center"
	                android:text="常规模式"
	                android:textColor="#ffffffff"
	                android:textSize="28sp" />
	        </LinearLayout>
	        <View
                android:layout_width="4dp"
	            android:layout_height="match_parent"
	            android:layout_marginBottom="10dp"
	            android:layout_marginTop="10dp"
	            android:background="?android:attr/listDivider"/>
	        <LinearLayout
	            android:id="@+id/menu_2"
	            android:layout_width="250dp"
	            android:layout_height="match_parent"
	            android:orientation="vertical" >
	            <TextView
	                android:id="@+id/textView2"
	                android:layout_width="wrap_content"
	                android:layout_height="match_parent"
	                android:layout_gravity="center"
	                android:gravity="center"
	                android:text="家居控制"
	                android:textColor="#ffffffff"
	                android:textSize="28sp" />
	        </LinearLayout>
	        <View
                android:layout_width="3dp"
	            android:layout_height="match_parent"
	            android:layout_marginBottom="10dp"
	            android:layout_marginTop="10dp"
	            android:background="?android:attr/listDivider"/>
	        <LinearLayout
	            android:id="@+id/menu_3"
	            android:layout_width="250dp"
	            android:layout_height="match_parent"
	            android:orientation="vertical" >
	            <TextView
	                android:id="@+id/textView3"
	                android:layout_width="wrap_content"
	                android:layout_height="match_parent"
	                android:layout_gravity="center"
	                android:gravity="center"
	                android:text="幸福社区"
	                android:textColor="#ffffffff"
	                android:textSize="28sp" />
	        </LinearLayout>
   		</LinearLayout>
    </RelativeLayout>

    <LinearLayout
        android:id="@+id/root"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >
    </LinearLayout>

</LinearLayout>

Fragment1.java

package com.wxl.fragment;

import android.annotation.SuppressLint;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

@SuppressLint("NewApi")
public class Fragment1 extends Fragment {
	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		return inflater.inflate(R.layout.fragment1, container,false);
	}
}

Fragment2.java

package com.wxl.fragment;

import android.annotation.SuppressLint;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

@SuppressLint("NewApi")
public class Fragment2 extends Fragment {
	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		return inflater.inflate(R.layout.fragment2, container,false);
	}
}

Fragment3.java

package com.wxl.fragment;

import android.annotation.SuppressLint;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

@SuppressLint("NewApi")
public class Fragment3 extends Fragment {
	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		return inflater.inflate(R.layout.fragment3, container,false);
	}
}

MainActivity.java

package com.wxl.fragment;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.LinearLayout;

public class MainActivity extends Activity implements OnClickListener{
	public static final int NORMAL_MODE = 0;
	public static final int SMARTHOME_MODE = 1;
	public static final int COMMUNITY_MODE = 2;

	FragmentManager fragmentManager;

	private int mMode = NORMAL_MODE;

	private Fragment  mFragment;//记录当前处于哪个fragment
	private Fragment1 fragment1;
	private Fragment2 fragment2;
	private Fragment3 fragment3;

	@SuppressLint("NewApi") @Override
    protected void onCreate(Bundle savedInstanceState) {
		LinearLayout menu1, menu2, menu3;
        super.onCreate(savedInstanceState);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);

        menu1 = (LinearLayout)this.findViewById(R.id.menu_1);
        menu1.setOnClickListener(this);
        menu2 = (LinearLayout)this.findViewById(R.id.menu_2);
        menu2.setOnClickListener(this);
        menu3 = (LinearLayout)this.findViewById(R.id.menu_3);
        menu3.setOnClickListener(this);

        fragmentManager = getFragmentManager();

        /*fragmentManager.beginTransaction()获取FragmentTransaction对象
         * hide(mFragment)隐藏当前的fragment
         * */
        fragment1 = new Fragment1();
        if (fragment1.isAdded()) {
        	fragmentManager.beginTransaction().show(fragment1).hide(mFragment).commit();
		} else {
			fragmentManager.beginTransaction().add(R.id.root, fragment1)
					.show(fragment1).commit();
		}
        mFragment = fragment1;
	}

	@SuppressLint("NewApi") @Override
	public void onClick(View arg0) {
		// TODO Auto-generated method stub
		int mode = NORMAL_MODE;
		switch (arg0.getId()) {
		case R.id.menu_1:
			{
				mode = NORMAL_MODE;
			}
			break;
		case R.id.menu_2:
			{
				mode = SMARTHOME_MODE;
			}
			break;
		case R.id.menu_3:
			{
				mode = COMMUNITY_MODE;
			}
			break;
		}

		if (mMode == mode)
			return;
		mMode = mode;
		FragmentTransaction fragmentTransaction;
		fragmentTransaction = fragmentManager.beginTransaction();
		if (mode == NORMAL_MODE) {
			if (fragment1 == null) {
				fragment1 = new Fragment1();
			}

			if (fragment1.isAdded()) {
				fragmentTransaction.show(fragment1).hide(mFragment).commit();
			} else {
				fragmentTransaction.add(R.id.root, fragment1)
						.show(fragment1).hide(mFragment).commit();
			}
			mFragment = fragment1;
		} else if (mode == SMARTHOME_MODE) {
			if (fragment2 == null) {
				fragment2 = new Fragment2();
			}

			if (fragment2.isAdded()) {
				fragmentTransaction.show(fragment2).hide(mFragment).commit();
			} else {
				fragmentTransaction.add(R.id.root, fragment2)
						.show(fragment2).hide(mFragment).commit();
			}
			mFragment = fragment2;
		} else if (mode == COMMUNITY_MODE) {
			if (fragment3 == null) {
				fragment3 = new Fragment3();
			}

			if (fragment3.isAdded()) {
				fragmentTransaction.show(fragment3).hide(mFragment).commit();
			} else {
				fragmentTransaction.add(R.id.root, fragment3)
						.show(fragment3).hide(mFragment).commit();
			}
			mFragment = fragment3;
		}
	}
}

注意：

同一个FragmentTransaction对象只能有一次commit()，否则提示“java.lang.IllegalStateException:commit already called”。

源码下载：

http://download.csdn.net/detail/thanksgining/8406745