Android 高级控件（三）

1.RecyclerView 5.0

添加RecyclerView引用：compile 'com.android.support:recyclerview-v7:24.0.0-alpha1'（build.gradle）<1>布局方式：LayoutManager    横向布局     垂直布局    网格布局Grid<2>分割线：ItemDecoration    Github托管源码：https://github.com/yqritc/RecyclerView-FlexibleDivider

<android.support.v7.widget.RecyclerView        android:layout_width="match_parent"        android:layout_height="match_parent"        android:id="@+id/rv_main_recycler"        ></android.support.v7.widget.RecyclerView>

activity：

private RecyclerView rv_main_list;    private List<String> list=new ArrayList<>();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        rv_main_list = (RecyclerView) findViewById(R.id.rv_main_recycler);        for (int i = 1; i <=10 ; i++) {            list.add("张"+i);        }        //制定默认的排列方式        //rv_main_list.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,true));        rv_main_list.setLayoutManager(new GridLayoutManager(this,2,GridLayoutManager.HORIZONTAL,false));        rv_main_list.setAdapter(new MyAdapter());    }    class MyAdapter extends RecyclerView.Adapter{        class MyViewHolder extends RecyclerView.ViewHolder{            public TextView textview;            public MyViewHolder(View itemView) {                super(itemView);                textview= (TextView) itemView.findViewById(android.R.id.text1);            }        }        //类似 BaseAdapter中的 getView()        //RecyclerView.ViewHolder  类似 ItemTag        @Override        public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {            View v=getLayoutInflater().inflate(android.R.layout.simple_list_item_1,null);            return new MyViewHolder(v);        }        //给控件绑值        @Override        public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {            MyViewHolder myVH= (MyViewHolder) holder;            myVH.textview.setText(list.get(position));        }        @Override        public int getItemCount() {            return list.size();        }    }

2.Gallery 画廊—-过时

完成一个图片的滑动切换效果：

private Gallery g_gallery_image;    private int images[]={R.drawable.image1,R.drawable.image3,R.drawable.image4};    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_gallery);        g_gallery_image = (Gallery) findViewById(R.id.g_gallery_image);        g_gallery_image.setAdapter(new MyAdapter());    }    class MyAdapter extends BaseAdapter{        @Override        public int getCount() {            return images.length;        }        @Override        public Object getItem(int position) {            return images[position];        }        @Override        public long getItemId(int position) {            return position;        }        @Override        public View getView(int position, View convertView, ViewGroup parent) {            ImageView imageView=new ImageView(GalleryActivity.this);            Gallery.LayoutParams layoutParams=new Gallery.LayoutParams(300,400);            imageView.setLayoutParams(layoutParams);            imageView.setImageResource(images[position]);            imageView.setScaleType(ImageView.ScaleType.FIT_XY);            return imageView;        }    }

3.ViewPager（Gallery的替代品）

<1>引导页    适配器   PagerAdapter    滑动监听 addOnPageChangeListener    导航点   github开源框架：ViewPagerIndicator            属性：            setRadius：设置半径            setPageColor：点的背景颜色            setBackgroundColor：控件的背景颜色            setFillColor:设置点的背景颜色            setStrokeColor：设置点背景的边框颜色    进入主界面

<2>ViewPager+Activity(View)—->QQ好友分组 + ListView分组的滑动切换（包含多个activity的切换）

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

activity：

private ViewPager mmp_mvp;    private List<View> views;    private LocalActivityManager localActivityManager;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main_vp);        mmp_mvp = (ViewPager) findViewById(R.id.mmp_mvp);        views=new ArrayList<>();        //    LocalActivityManager是Android封装的把activity转换成view对象的一个api.        localActivityManager=new LocalActivityManager(this,true);        localActivityManager.dispatchCreate(savedInstanceState);        //页面转换成视图        Intent intent=new Intent(this,QQActivity.class);//第一个页面        View view=localActivityManager.startActivity("QQActivity",intent).getDecorView();        views.add(view);        Intent intent2=new Intent(this,SzLvActivity.class);//第二个页面        views.add(localActivityManager.startActivity("SzLvActivity",intent2).getDecorView());        mmp_mvp.setAdapter(new MyAdapter());    }    class MyAdapter extends PagerAdapter{        @Override        public int getCount() {            return views.size();        }        @Override        public boolean isViewFromObject(View view, Object object) {            return view==object;        }        @Override        public Object instantiateItem(ViewGroup container, int position) {            View v=views.get(position);            container.addView(v);            return v;        }        @Override        public void destroyItem(ViewGroup container, int position, Object object) {            View v=views.get(position);            container.removeView(v);        }    }