【Android UI设计与开发】6.底部菜单栏（三）使用Fragment+PopupWindow仿QQ空间最新版底部菜单栏

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <FrameLayout
        android:id="@+id/frame_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@+id/frameMenu"
        android:layout_alignParentTop="true" >
    </FrameLayout>

    <FrameLayout
        android:id="@+id/frameMenu"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@color/skin_tabbar_bg"
            android:orientation="horizontal" >

            <!-- 动态 -->

            <FrameLayout
                android:id="@+id/layout_at"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1" >

                <ImageView
                    android:id="@+id/image_at"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="top|center"
                    android:src="@drawable/skin_tabbar_icon_auth_select" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="bottom|center"
                    android:text="@string/skin_tabbar_icon_auth"
                    android:textColor="@android:color/black"
                    android:textSize="12sp" />
            </FrameLayout>

            <!-- 与我相关 -->

            <FrameLayout
                android:id="@+id/layout_auth"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1" >

                <ImageView
                    android:id="@+id/image_auth"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="top|center"
                    android:src="@drawable/skin_tabbar_icon_at_select" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="bottom|center"
                    android:text="@string/skin_tabbar_icon_at"
                    android:textColor="@android:color/black"
                    android:textSize="12sp" />
            </FrameLayout>

            <!-- 留白 -->

            <FrameLayout
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1" >
            </FrameLayout>

            <!-- 我的空间 -->

            <FrameLayout
                android:id="@+id/layout_space"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1" >

                <ImageView
                    android:id="@+id/image_space"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="top|center"
                    android:src="@drawable/skin_tabbar_icon_space_select" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="bottom|center"
                    android:text="@string/skin_tabbar_icon_space"
                    android:textColor="@android:color/black"
                    android:textSize="12sp" />
            </FrameLayout>

            <!-- 玩吧 -->

            <FrameLayout
                android:id="@+id/layout_more"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1" >

                <ImageView
                    android:id="@+id/image_more"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="top|center"
                    android:src="@drawable/skin_tabbar_icon_more_select" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="bottom|center"
                    android:text="@string/skin_tabbar_icon_more"
                    android:textColor="@android:color/black"
                    android:textSize="12sp" />
            </FrameLayout>
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="1px"
            android:background="@android:color/black" >
        </LinearLayout>
    </FrameLayout>

    <!-- 中间按钮背景 -->

    <ImageView
        android:id="@+id/toggle_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignTop="@+id/frameMenu"
        android:layout_centerInParent="true"
        android:src="@drawable/skin_tabbar_btn" />

    <!-- 中间按钮 -->

    <ImageView
        android:id="@+id/plus_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignTop="@+id/frameMenu"
        android:layout_centerInParent="true"
        android:src="@drawable/skin_tabbar_icon_select" />

</RelativeLayout>

package com.yanis.yc_ui_qzone;

import android.content.Context;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.util.DisplayMetrics;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.PopupWindow;
import android.widget.PopupWindow.OnDismissListener;

public class MainActivity extends FragmentActivity implements OnClickListener {
    // 定义Fragment页面
    private FragmentAt fragmentAt;
    private FragmentAuth fragmentAuth;
    private FragmentSpace fragmentSpace;
    private FragmentMore fragmentMore;
    // 定义布局对象
    private FrameLayout atFl, authFl, spaceFl, moreFl;

    // 定义图片组件对象
    private ImageView atIv, authIv, spaceIv, moreIv;

    // 定义按钮图片组件
    private ImageView toggleImageView, plusImageView;

    // 定义PopupWindow
    private PopupWindow popWindow;
    // 获取手机屏幕分辨率的类
    private DisplayMetrics dm;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initView();

        initData();

        // 初始化默认为选中点击了“动态”按钮
        clickAtBtn();
    }

    /**
     * 初始化组件
     */
    private void initView() {
        // 实例化布局对象
        atFl = (FrameLayout) findViewById(R.id.layout_at);
        authFl = (FrameLayout) findViewById(R.id.layout_auth);
        spaceFl = (FrameLayout) findViewById(R.id.layout_space);
        moreFl = (FrameLayout) findViewById(R.id.layout_more);

        // 实例化图片组件对象
        atIv = (ImageView) findViewById(R.id.image_at);
        authIv = (ImageView) findViewById(R.id.image_space);
        spaceIv = (ImageView) findViewById(R.id.image_space);
        moreIv = (ImageView) findViewById(R.id.image_more);

        // 实例化按钮图片组件
        toggleImageView = (ImageView) findViewById(R.id.toggle_btn);
        plusImageView = (ImageView) findViewById(R.id.plus_btn);

    }

    /**
     * 初始化数据
     */
    private void initData() {
        // 给布局对象设置监听
        atFl.setOnClickListener(this);
        authFl.setOnClickListener(this);
        spaceFl.setOnClickListener(this);
        moreFl.setOnClickListener(this);

        // 给按钮图片设置监听
        toggleImageView.setOnClickListener(this);
    }

    /**
     * 点击事件
     */
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        // 点击动态按钮
        case R.id.layout_at:
            clickAtBtn();
            break;
        // 点击与我相关按钮
        case R.id.layout_auth:
            clickAuthBtn();
            break;
        // 点击我的空间按钮
        case R.id.layout_space:
            clickSpaceBtn();
            break;
        // 点击更多按钮
        case R.id.layout_more:
            clickMoreBtn();
            break;
        // 点击中间按钮
        case R.id.toggle_btn:
            clickToggleBtn();
            break;
        }
    }

    /**
     * 点击了“动态”按钮
     */
    private void clickAtBtn() {
        // 实例化Fragment页面
        fragmentAt = new FragmentAt();
        // 得到Fragment事务管理器
        FragmentTransaction fragmentTransaction = this
                .getSupportFragmentManager().beginTransaction();
        // 替换当前的页面
        fragmentTransaction.replace(R.id.frame_content, fragmentAt);
        // 事务管理提交
        fragmentTransaction.commit();
        // 改变选中状态
        atFl.setSelected(true);
        atIv.setSelected(true);

        authFl.setSelected(false);
        authIv.setSelected(false);

        spaceFl.setSelected(false);
        spaceIv.setSelected(false);

        moreFl.setSelected(false);
        moreIv.setSelected(false);
    }

    /**
     * 点击了“与我相关”按钮
     */
    private void clickAuthBtn() {
        // 实例化Fragment页面
        fragmentAuth = new FragmentAuth();
        // 得到Fragment事务管理器
        FragmentTransaction fragmentTransaction = this
                .getSupportFragmentManager().beginTransaction();
        // 替换当前的页面
        fragmentTransaction.replace(R.id.frame_content, fragmentAuth);
        // 事务管理提交
        fragmentTransaction.commit();

        atFl.setSelected(false);
        atIv.setSelected(false);

        authFl.setSelected(true);
        authIv.setSelected(true);

        spaceFl.setSelected(false);
        spaceIv.setSelected(false);

        moreFl.setSelected(false);
        moreIv.setSelected(false);
    }

    /**
     * 点击了“我的空间”按钮
     */
    private void clickSpaceBtn() {
        // 实例化Fragment页面
        fragmentSpace = new FragmentSpace();
        // 得到Fragment事务管理器
        FragmentTransaction fragmentTransaction = this
                .getSupportFragmentManager().beginTransaction();
        // 替换当前的页面
        fragmentTransaction.replace(R.id.frame_content, fragmentSpace);
        // 事务管理提交
        fragmentTransaction.commit();

        atFl.setSelected(false);
        atIv.setSelected(false);

        authFl.setSelected(false);
        authIv.setSelected(false);

        spaceFl.setSelected(true);
        spaceIv.setSelected(true);

        moreFl.setSelected(false);
        moreIv.setSelected(false);
    }

    /**
     * 点击了“更多”按钮
     */
    private void clickMoreBtn() {
        // 实例化Fragment页面
        fragmentMore = new FragmentMore();
        // 得到Fragment事务管理器
        FragmentTransaction fragmentTransaction = this
                .getSupportFragmentManager().beginTransaction();
        // 替换当前的页面
        fragmentTransaction.replace(R.id.frame_content, fragmentMore);
        // 事务管理提交
        fragmentTransaction.commit();

        atFl.setSelected(false);
        atIv.setSelected(false);

        authFl.setSelected(false);
        authIv.setSelected(false);

        spaceFl.setSelected(false);
        spaceIv.setSelected(false);

        moreFl.setSelected(true);
        moreIv.setSelected(true);
    }

    /**
     * 点击了中间按钮
     */
    private void clickToggleBtn() {
        showPopupWindow(toggleImageView);
        // 改变按钮显示的图片为按下时的状态
        plusImageView.setSelected(true);
    }

    /**
     * 改变显示的按钮图片为正常状态
     */
    private void changeButtonImage() {
        plusImageView.setSelected(false);
    }

    /**
     * 显示PopupWindow弹出菜单
     */
    private void showPopupWindow(View parent) {
        if (popWindow == null) {
            LayoutInflater layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            View view = layoutInflater.inflate(R.layout.popwindow_layout, null);
            dm = new DisplayMetrics();
            getWindowManager().getDefaultDisplay().getMetrics(dm);
            // 创建一个PopuWidow对象
            popWindow = new PopupWindow(view, dm.widthPixels, LinearLayout.LayoutParams.WRAP_CONTENT); 
        }
        // 使其聚集 ，要想监听菜单里控件的事件就必须要调用此方法
        popWindow.setFocusable(true);
        // 设置允许在外点击消失
        popWindow.setOutsideTouchable(true);
        // 设置背景，这个是为了点击“返回Back”也能使其消失，并且并不会影响你的背景
        popWindow.setBackgroundDrawable(new BitmapDrawable());
        // PopupWindow的显示及位置设置
        // popWindow.showAtLocation(parent, Gravity.FILL, 0, 0);
        popWindow.showAsDropDown(parent, 0,0);

        popWindow.setOnDismissListener(new OnDismissListener() {
            @Override
            public void onDismiss() {
                // 改变显示的按钮图片为正常状态
                changeButtonImage();
            }
        });

        // 监听触屏事件
        popWindow.setTouchInterceptor(new OnTouchListener() {
            public boolean onTouch(View view, MotionEvent event) {
                // 改变显示的按钮图片为正常状态
                changeButtonImage();
                popWindow.dismiss();
                return false;
            }
        });
    }
}