• 安卓开发之左侧滑动菜单学习


    左侧滑动窗口是很多app应用经常用到的,学习它也是很有必要的。

    左侧滑动xml的布局:

    <android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/drawer_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    
        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:clipToPadding="true"
            android:fitsSystemWindows="true" >
    
            <include
                android:id="@+id/rl_title"
                layout="@layout/layout_main_title" />
    
            <!-- The main content view -->
    
            <FrameLayout
                android:id="@+id/content_frame"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_below="@+id/rl_title"
                android:background="@color/white_normal" >
            </FrameLayout>
        </RelativeLayout>
    
        <!-- The navigation view -->
        <FrameLayout
            android:id="@+id/left_drawer"
            android:layout_width="280dp"
            android:layout_height="match_parent"
            android:layout_gravity="start" >
    
            <include layout="@layout/layout_main_left" />
        </FrameLayout>
    
    <!--     <ListView -->
    <!--     android:id="@+id/left_drawer" -->
    <!--     android:layout_width="240dp" -->
    <!--     android:layout_height="match_parent" -->
    <!--     android:layout_gravity="start" -->
    <!--     android:background="#ffffcc" -->
    <!--     android:choiceMode="singleChoice" -->
    <!--     android:divider="@android:color/transparent" -->
    <!--     android:dividerHeight="0dp" > -->
    <!--     </ListView> -->
    
    </android.support.v4.widget.DrawerLayout>

    include是连接一个新的页面的布局,对于复杂的页面设计,可以起到很好地效果,这样使得结构更清晰,更具有可读性。

    FrameLayout是一个框架,也可以把它看着一个activity。上面是一个整体的框架布局,一般把主体部分放在左滑动菜单前面,

    这样更利于编辑是区分。

    下面是上面xml的效果图:

    绿框就是默认的菜单位置。

    Main的代码:

    package com.ansen.developerheadlines.activity;
    
    import android.os.Build;
    import android.os.Bundle;
    import android.support.v4.app.FragmentActivity;
    import android.support.v4.app.FragmentTransaction;
    import android.support.v4.widget.DrawerLayout;
    import android.view.Gravity;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.view.WindowManager;
    import android.widget.RelativeLayout;
    
    import com.ansen.developerheadlines.R;
    import com.ansen.developerheadlines.fragment.ContentFragment;
    import com.ansen.developerheadlines.fragment.GiftFragment;
    import com.ansen.developerheadlines.fragment.MainFragment;
    import com.ansen.developerheadlines.fragment.ShareFragment;
    
    public class MainActivity extends FragmentActivity{
        private DrawerLayout mDrawerLayout;
    
        private RelativeLayout rlHome, rlGift, rlShare;
        
        private int currentSelectItem = R.id.rl_home;// 默认首页
        
        private MainFragment mainFragment;
        private ShareFragment shareFragment;
        private GiftFragment giftFragment;
    
    //    private ContentFragment contentFragment;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    
            findViewById(R.id.iv_menu).setOnClickListener(clickListener);
            
            initLeftMenu();//初始化左边菜单
            
    //        contentFragment=new ContentFragment();
            mainFragment=new MainFragment();
    //        getSupportFragmentManager().beginTransaction().add(R.id.content_frame,contentFragment).commit();  
            getSupportFragmentManager().beginTransaction().add(R.id.content_frame,mainFragment).commit();
            setWindowStatus();
        }
    
        private void initLeftMenu() {
            rlHome = (RelativeLayout) findViewById(R.id.rl_home);
            rlGift = (RelativeLayout) findViewById(R.id.rl_gift);
            rlShare = (RelativeLayout) findViewById(R.id.rl_share);
    
            rlHome.setOnClickListener(onLeftMenuClickListener);
            rlGift.setOnClickListener(onLeftMenuClickListener);
            rlShare.setOnClickListener(onLeftMenuClickListener);
    
            rlHome.setSelected(true);
        }
    
        private OnClickListener onLeftMenuClickListener = new OnClickListener() {
            @Override
            public void onClick(View v) {
                if (currentSelectItem != v.getId()) {//防止重复点击
                    currentSelectItem=v.getId();
                    noItemSelect();
                    changeFragment(v.getId());//设置fragment显示切换
                    switch (v.getId()) {
                    case R.id.rl_home:
                        rlHome.setSelected(true);
    //                    contentFragment.setContent("这是首页");
                        break;
                    case R.id.rl_gift:
                        rlGift.setSelected(true);
    //                     contentFragment.setContent("这是礼物");
                        break;
                    case R.id.rl_share:
                        rlShare.setSelected(true);
    //                     contentFragment.setContent("这是分享");
                        break;
                    }
                    mDrawerLayout.closeDrawer(Gravity.LEFT);
                }
            }
        };
        
        /**
         * 改变fragment的显示
         * @param resId
    //     */
        private void changeFragment(int resId) {
            FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();//开启一个Fragment事务
            
            hideFragments(transaction);//  t
            if(resId==R.id.rl_home){//主页
                if(mainFragment==null){//如果为空先添加进来.不为空直接显示
                    mainFragment = new MainFragment();
                    transaction.add(R.id.content_frame,mainFragment);
                }else {
                    transaction.show(mainFragment);
                }
            }else if(resId==R.id.rl_share){
                if(shareFragment==null){
                    shareFragment = new ShareFragment();
                    transaction.add(R.id.content_frame,shareFragment);//加入后直接调用了show()显示。
                }else {
                    transaction.show(shareFragment);
                }
            }else if(resId==R.id.rl_gift){
                if(giftFragment==null){
                    giftFragment = new GiftFragment();
                    transaction.add(R.id.content_frame,giftFragment);
                }else {
                    transaction.show(giftFragment);
                }
            }
            transaction.commitAllowingStateLoss();//一定要记得提交事务
        }
        
        /**
         * 显示之前隐藏所有fragment
         * @param transaction
         */
        private void hideFragments(FragmentTransaction transaction){
            if (mainFragment != null)//不为空才隐藏,如果不判断第一次会有空指针异常
                transaction.hide(mainFragment);
            if (shareFragment != null)
                transaction.hide(shareFragment);
            if (giftFragment != null)
                transaction.hide(giftFragment);
        }
        
        private void noItemSelect(){
            rlHome.setSelected(false);
            rlGift.setSelected(false);
            rlShare.setSelected(false);
        }
    
        private OnClickListener clickListener = new OnClickListener() {
            @Override
            public void onClick(View v) {
                switch (v.getId()) {
                case R.id.iv_menu:// 打开左边抽屉
                    mDrawerLayout.openDrawer(Gravity.LEFT);
                    break;
                }
            }
        };
    
        // 设置状态栏
        private void setWindowStatus() {
    //        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
    //            // 透明状态栏
    //            getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
    //            // 透明导航栏
    //            getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
    //            // 设置状态栏颜色
    //            getWindow().setBackgroundDrawableResource(R.color.main_color);
    //        }
        }
    }

    这些只是部分代码,需要进一步补充才能看到效果。

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  • 原文地址:https://www.cnblogs.com/weifengxiyu/p/5555686.html
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