【Andorid X 项目笔记】嵌套Fragment的使用(5)


前言

 之前的文章有介绍ActivityGroup,不少人问嵌套使用的问题,同样的需求在Fragment中也存在,幸好在最新的Android support 包已经支持这一特性!这里就跳过Fragment的介绍,需要注意的是TabActivity已经被标记为弃用(deprecated)。

 

声明
  欢迎转载,但请保留文章原始出处:)
    博客园:http://www.cnblogs.com
    农民伯伯: http://www.cnblogs.com/over140/ 

 

正文

一、准备

关于最新的Android兼容包的介绍,参见官网这里。可以在android sdk目录下extras/android/support/v13/android-support-v13.jar找到最新版,注意是伴随着Android 4.2一起更新的。

关于嵌套Fragment的介绍,参照官网这里。 

 

二、截图

 

 

三、代码 

FragmentNestActivity.java

 

import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.TextView;

/**
 * 嵌套Fragment使用
 * 
 * 
@author 农民伯伯
 * 
@see http://www.cnblogs.com/over140/archive/2013/01/02/2842227.html
 * 
 
*/
public class FragmentNestActivity extends FragmentActivity implements OnClickListener {

    @Override
    protected void onCreate(Bundle arg0) {
        super.onCreate(arg0);
        setContentView(R.layout.nested_fragments);

        findViewById(R.id.btnModule1).setOnClickListener(this);
        findViewById(R.id.btnModule2).setOnClickListener(this);
        findViewById(R.id.btnModule3).setOnClickListener(this);

        findViewById(R.id.btnModule1).performClick();
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.btnModule1:
            addFragmentToStack(FragmentParent.newInstance(0));
            break;
        case R.id.btnModule2:
            addFragmentToStack(FragmentParent.newInstance(1));
            break;
        case R.id.btnModule3:
            addFragmentToStack(FragmentParent.newInstance(2));
            break;
        }
    }

    private void addFragmentToStack(Fragment fragment) {
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        //        ft.setCustomAnimations(android.R.anim.slide_in_left, android.R.anim.slide_in_left);
        ft.replace(R.id.fragment_container, fragment);
        ft.commit();
    }

    /** 嵌套Fragment */
    public final static class FragmentParent extends Fragment {

        public static final FragmentParent newInstance(int position) {
            FragmentParent f = new FragmentParent();
            Bundle args = new Bundle(2);
            args.putInt("position", position);
            f.setArguments(args);
            return f;
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            View convertView = inflater.inflate(R.layout.viewpager_fragments, container, false);
            ViewPager pager = (ViewPager) convertView.findViewById(R.id.pager);

            final int parent_position = getArguments().getInt("position");
            //注意这里的代码
            pager.setAdapter(new FragmentStatePagerAdapter(getChildFragmentManager()) {

                @Override
                public Fragment getItem(final int position) {
                    return new Fragment() {
                        @Override
                        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
                            TextView convertView = new TextView(getActivity());
                            convertView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT));
                            convertView.setGravity(Gravity.CENTER);
                            convertView.setTextSize(30);
                            convertView.setTextColor(Color.BLACK);
                            convertView.setText("Page " + position);
                            return convertView;
                        }
                    };
                }

                @Override
                public int getCount() {
                    return 3;
                }

                @Override
                public CharSequence getPageTitle(int position) {
                    return "Page " + parent_position + " - " + position;
                }

            });

            return convertView;
        }
    }
}

 

代码说明:

这里最关键的是方法getChildFragmentManager的支持。这里也演示了Fragment作为嵌套内部类的使用方法。

 

nested_fragments.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:orientation
="vertical" >

    <FrameLayout
        
android:id="@+id/fragment_container"
        android:layout_width
="fill_parent"
        android:layout_height
="0dip"
        android:layout_weight
="1.0"
        android:background
="#F7F5DE" >
    </FrameLayout>

    <LinearLayout
        
android:layout_width="fill_parent"
        android:layout_height
="wrap_content"
        android:layout_gravity
="bottom"
        android:background
="@android:color/black"
        android:orientation
="horizontal" >

        <ImageView
            
android:id="@+id/btnModule1"
            android:layout_width
="wrap_content"
            android:layout_height
="wrap_content"
            android:layout_marginBottom
="3dp"
            android:layout_marginLeft
="7dp"
            android:layout_marginTop
="3dp"
            android:src
="@android:drawable/ic_dialog_dialer" />

        <ImageView
            
android:id="@+id/btnModule2"
            android:layout_width
="wrap_content"
            android:layout_height
="wrap_content"
            android:layout_marginBottom
="3dp"
            android:layout_marginLeft
="7dp"
            android:layout_marginTop
="3dp"
            android:src
="@android:drawable/ic_dialog_info" />

        <ImageView
            
android:id="@+id/btnModule3"
            android:layout_width
="wrap_content"
            android:layout_height
="wrap_content"
            android:layout_marginBottom
="3dp"
            android:layout_marginLeft
="7dp"
            android:layout_marginTop
="3dp"
            android:src
="@android:drawable/ic_dialog_alert" />
    </LinearLayout>

</LinearLayout>

 

viewpager_fragments.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.support.v4.view.ViewPager
        
android:id="@+id/pager"
        android:layout_width
="match_parent"
        android:layout_height
="match_parent" >

        <android.support.v4.view.PagerTitleStrip
            
android:layout_width="wrap_content"
            android:layout_height
="wrap_content"
            android:layout_gravity
="top" />
    </android.support.v4.view.ViewPager>

</LinearLayout>

 

代码说明:

注意!实践发现ViewPager并不能作为顶层容器,否则会报错。


四、说明

这是一个典型的嵌套Fragment的例子,最外层使用FrameLayout来实现几大模块的切换,内部使用ViewPager实现子模块的切换,非常实用。 

 

结束

考虑把Support Package, revision 11 更新翻译一下,强烈建议大家升级到最新的兼容包。

posted @ 2013-02-18 11:02  农民伯伯  阅读(58741)  评论(13编辑  收藏  举报