Android仿微信界面--使用Fragment实现(慕课网笔记)

package com.example.imooc_weixinfragment;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class WeixinFragment extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        //引入我们的布局
        return inflater.inflate(R.layout.tab01, container, false);
    }

}

package com.example.imooc_weixinfragment;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class FrdFragment extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        //引入我们的布局
        return inflater.inflate(R.layout.tab02, container, false);
    }

}

package com.example.imooc_weixinfragment;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class AddressFragment extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        //引入我们的布局
        return inflater.inflate(R.layout.tab03, container, false);
    }

}

package com.example.imooc_weixinfragment;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class SettingFragment extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        //引入我们的布局
        return inflater.inflate(R.layout.tab04, container, false);
    }

}

<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"
    >

   <include layout="@layout/top"/>
    <FrameLayout
        android:id="@+id/id_content"
        android:layout_weight="1"
        android:layout_width="match_parent"
        android:layout_height="0dp">

    </FrameLayout>
   <include layout="@layout/bottom"/>

</LinearLayout>

package com.example.imooc_weixinfragment;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.LinearLayout;

//我们使用的是android v4包下的fragment,这里必须要继承自FragmentActivity，而不是Activity
public class MainActivity extends FragmentActivity implements OnClickListener{
    //底部的4个导航控件
    private LinearLayout mTabWeixin;
    private LinearLayout mTabFrd;
    private LinearLayout mTabAddress;
    private LinearLayout mTabSetting;
    //底部4个导航控件中的图片按钮
    private ImageButton mImgWeixin;
    private ImageButton mImgFrd;
    private ImageButton mImgAddress;
    private ImageButton mImgSetting;
    //初始化4个Fragment
    private Fragment tab01;
    private Fragment tab02;
    private Fragment tab03;
    private Fragment tab04;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
        initView();//初始化所有的view
        initEvents();
        setSelect(0);//默认显示微信聊天界面
    }

    private void initEvents() {
        mTabWeixin.setOnClickListener(this);
        mTabFrd.setOnClickListener(this);
        mTabAddress.setOnClickListener(this);
        mTabSetting.setOnClickListener(this);

    }

    private void initView() {
        mTabWeixin = (LinearLayout)findViewById(R.id.id_tab_weixin);
        mTabFrd = (LinearLayout)findViewById(R.id.id_tab_frd);
        mTabAddress = (LinearLayout)findViewById(R.id.id_tab_address);
        mTabSetting = (LinearLayout)findViewById(R.id.id_tab_setting);
        mImgWeixin = (ImageButton)findViewById(R.id.id_tab_weixin_img);
        mImgFrd = (ImageButton)findViewById(R.id.id_tab_frd_img);
        mImgAddress = (ImageButton)findViewById(R.id.id_tab_address_img);
        mImgSetting = (ImageButton)findViewById(R.id.id_tab_setting_img);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onClick(View v) {
        resetImg();
        switch (v.getId()) {
        case R.id.id_tab_weixin://当点击微信按钮时，切换图片为亮色，切换fragment为微信聊天界面
            setSelect(0);
            break;
        case R.id.id_tab_frd:
            setSelect(1);
            break;
        case R.id.id_tab_address:
            setSelect(2);
            break;
        case R.id.id_tab_setting:
            setSelect(3);
            break;

        default:
            break;
        }

    }

    /*
     * 将图片设置为亮色的；切换显示内容的fragment
     * */
    private void setSelect(int i) {
        FragmentManager fm = getSupportFragmentManager();
        FragmentTransaction transaction = fm.beginTransaction();//创建一个事务
        hideFragment(transaction);//我们先把所有的Fragment隐藏了，然后下面再开始处理具体要显示的Fragment
        switch (i) {
        case 0:
            if (tab01 == null) {
                tab01 = new WeixinFragment();
                /*
                 * 将Fragment添加到活动中，public abstract FragmentTransaction add (int containerViewId, Fragment fragment)
                *containerViewId即为Optional identifier of the container this fragment is to be placed in. If 0, it will not be placed in a container.
                 * */
                transaction.add(R.id.id_content, tab01);//将微信聊天界面的Fragment添加到Activity中
            }else {
                transaction.show(tab01);
            }
            mImgWeixin.setImageResource(R.drawable.tab_weixin_pressed);
            break;
        case 1:
            if (tab02 == null) {
                tab02 = new FrdFragment();
                transaction.add(R.id.id_content, tab02);
            }else {
                transaction.show(tab02);
            }
            mImgFrd.setImageResource(R.drawable.tab_find_frd_pressed);
            break;
        case 2:
            if (tab03 == null) {
                tab03 = new AddressFragment();
                transaction.add(R.id.id_content, tab03);
            }else {
                transaction.show(tab03);
            }
            mImgAddress.setImageResource(R.drawable.tab_address_pressed);
            break;
        case 3:
            if (tab04 == null) {
                tab04 = new SettingFragment();
                transaction.add(R.id.id_content, tab04);
            }else {
                transaction.show(tab04);
            }
            mImgSetting.setImageResource(R.drawable.tab_settings_pressed);
            break;

        default:
            break;
        }
        transaction.commit();//提交事务
    }

    /*
     * 隐藏所有的Fragment
     * */
    private void hideFragment(FragmentTransaction transaction) {
        if (tab01 != null) {
            transaction.hide(tab01);
        }
        if (tab02 != null) {
            transaction.hide(tab02);
        }
        if (tab03 != null) {
            transaction.hide(tab03);
        }
        if (tab04 != null) {
            transaction.hide(tab04);
        }

    }

    private void resetImg() {
        mImgWeixin.setImageResource(R.drawable.tab_weixin_normal);
        mImgFrd.setImageResource(R.drawable.tab_find_frd_normal);
        mImgAddress.setImageResource(R.drawable.tab_address_normal);
        mImgSetting.setImageResource(R.drawable.tab_settings_normal);
    }
}