安卓万能适配器-CommonAdapter

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/qq_34536167/article/details/79327007

依赖：recyclerview+glide图片加载器

compile 'com.android.support:recyclerview-v7:25.3.1'
compile 'com.github.bumptech.glide:glide:4.0.0'

1、ListView、GridView等适配器

CommonAdapter

public abstract class CommonAdapter<T> extends BaseAdapter {

    //关联的布局
    protected LayoutInflater mInflater;
    //上下文
    protected Context mContext;
    //数据源
    protected List<T> mDatas;
    protected final int mItemLayoutId;

    public CommonAdapter(Context context, int itemLayoutId, List<T> mDatas) {
        this.mContext = context;
        this.mInflater = LayoutInflater.from(mContext);
        this.mDatas = mDatas;
        this.mItemLayoutId = itemLayoutId;
    }

    @Override
    public int getCount() {
        return mDatas.size();
    }

    @Override
    public T getItem(int position) {
        return mDatas.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        final ViewHolder viewHolder = getViewHolder(position, convertView, parent);
        convert(viewHolder, getItem(position),position);
        return viewHolder.getConvertView();

    }

    public abstract void convert(ViewHolder holder, T item,int postion);

    private ViewHolder getViewHolder(int position, View convertView, ViewGroup parent) {
        return ViewHolder.get(mContext, convertView, parent, mItemLayoutId, position);
    }
}

辅助类viewhodler

public class ViewHolder {

    private final SparseArray<View> mViews;
    private int mPostion;
    private View mConvertView;
    private Context mContext;

    private ViewHolder(Context context, ViewGroup parent, int layoutId, int position) {
        this.mViews = new SparseArray<>();
        this.mPostion = position;
        this.mContext = context;
        mConvertView = LayoutInflater.from(context).inflate(layoutId, parent, false);
        mConvertView.setTag(this);
    }

    /**
     * 拿到一个ViewHolder对象
     *
     * @param context
     * @param convertView
     * @param parent
     * @param layoutId
     * @param position
     * @return
     */
    public static ViewHolder get(Context context, View convertView, ViewGroup parent, int layoutId, int position) {
        if (convertView == null) {
            return new ViewHolder(context, parent, layoutId, position);
        }
        return (ViewHolder) convertView.getTag();
    }

    /**
     * 通过控件的Id获取对于的控件，如果没有则加入views
     *
     * @param viewId
     * @return
     */
    public <T extends View> T getView(int viewId) {

        View view = mViews.get(viewId);
        if (view == null) {
            view = mConvertView.findViewById(viewId);
            mViews.put(viewId, view);
        }
        return (T) view;
    }

    public View getConvertView() {
        return mConvertView;
    }

    /**
     * 设置文本(可以自己添加设置image bitmap color等)
     */
    public ViewHolder setText(int viewId, String text) {
        TextView tv = getView(viewId);
        tv.setText(text);
        return this;
    }
}

2、RecyclerView适配器

CommonRecyclerAdapter

public abstract class CommonRecyclerAdapter<T> extends RecyclerView.Adapter<RecyclerHolder> {

    private Context context;//上下文
    private List<T> list;//数据源
    private LayoutInflater inflater;//布局器
    private int itemLayoutId;//布局id
    private OnItemClickListener listener;//点击事件监听器
    private OnItemLongClickListener longClickListener;//长按监听器
    private RecyclerView recyclerView;

    //在RecyclerView提供数据的时候调用
    @Override
    public void onAttachedToRecyclerView(RecyclerView recyclerView) {
        super.onAttachedToRecyclerView(recyclerView);
        this.recyclerView = recyclerView;
    }

    @Override
    public void onDetachedFromRecyclerView(RecyclerView recyclerView) {
        super.onDetachedFromRecyclerView(recyclerView);
        this.recyclerView = null;
    }

    /**
     * 定义一个点击事件接口回调
     */
    public interface OnItemClickListener {
        void onItemClick(RecyclerView parent, View view, int position);
    }

    public interface OnItemLongClickListener {
        boolean onItemLongClick(RecyclerView parent, View view, int position);
    }

    public CommonRecyclerAdapter(Context context, int itemLayoutId, List<T> list) {
        this.context = context;
        this.list = list;
        this.itemLayoutId = itemLayoutId;
        inflater = LayoutInflater.from(context);
    }

    @Override
    public RecyclerHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = inflater.inflate(itemLayoutId, parent, false);
        return RecyclerHolder.getRecyclerHolder(context, view);
    }

    @Override
    public void onBindViewHolder(final RecyclerHolder holder, int position) {

        if (listener != null) {
            holder.itemView.setBackgroundResource(R.mipmap.ic_launcher);//设置背景
        }
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (listener != null && view != null && recyclerView != null) {
                    int position = recyclerView.getChildAdapterPosition(view);
                    listener.onItemClick(recyclerView, view, position);
                }
            }
        });
        holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View view) {
                if (longClickListener != null && view != null && recyclerView != null) {
                    int position = recyclerView.getChildAdapterPosition(view);
                    longClickListener.onItemLongClick(recyclerView, view, position);
                    return true;
                }
                return false;
            }
        });
        convert(holder, list.get(position), position);
    }

    @Override
    public int getItemCount() {
        return list == null ? 0 : list.size();
    }

    public void setOnItemClickListener(OnItemClickListener listener) {
        this.listener = listener;
    }

    public void setOnItemLongClickListener(OnItemLongClickListener longClickListener) {
        this.longClickListener = longClickListener;
    }

    /**
     * 填充RecyclerView适配器的方法，子类需要重写
     *
     * @param holder      ViewHolder
     * @param item        子项
     * @param position    位置
     */
    public abstract void convert(RecyclerHolder holder, T item, int position);
}

RecyclerHolder

public class RecyclerHolder extends RecyclerView.ViewHolder {

    private SparseArray<View> views;
    private Context context;

    private RecyclerHolder(Context context, View itemView) {
        super(itemView);
        this.context = context;
        this.views = new SparseArray<>();
    }

    /**
     * 取得一个RecyclerHolder对象
     *
     * @param context  上下文
     * @param itemView 子项
     * @return 返回一个RecyclerHolder对象
     */
    public static RecyclerHolder getRecyclerHolder(Context context, View itemView) {
        return new RecyclerHolder(context, itemView);
    }

    public SparseArray<View> getViews() {
        return this.views;
    }

    /**
     * 通过view的id获取对应的控件，如果没有则加入views中
     *
     * @param viewId 控件的id
     * @return 返回一个控件
     */
    @SuppressWarnings("unchecked")
    public <T extends View> T getView(int viewId) {
        View view = views.get(viewId);
        if (view == null) {
            view = itemView.findViewById(viewId);
            views.put(viewId, view);
        }
        return (T) view;
    }

    /**
     * 设置字符串
     */
    public RecyclerHolder setText(int viewId, String text) {
        TextView tv = getView(viewId);
        tv.setText(text);
        return this;
    }

    /**
     * 设置图片
     */
    public RecyclerHolder setImageResource(int viewId, int drawableId) {
        ImageView iv = getView(viewId);
        iv.setImageResource(drawableId);
        return this;
    }

    /**
     * 设置图片
     */
    public RecyclerHolder setImageBitmap(int viewId, Bitmap bitmap) {
        ImageView iv = getView(viewId);
        iv.setImageBitmap(bitmap);
        return this;
    }

    /**
     * 设置图片
     */
    public RecyclerHolder setImageByUrl(int viewId, String url) {
        RequestOptions requestOptions = new RequestOptions();
        requestOptions.error(R.mipmap.ic_launcher);
        requestOptions.placeholder(R.mipmap.ic_launcher);
        Glide.with(context).load(url).apply(requestOptions).into((ImageView) getView(viewId));
        return this;
    }
}

3、RecyclerView使用方法，listview的几乎一致

3.1、定义一个数据实体类

public class DataBean {

    /**
     * 标题
     */
    private String title;
    /**
     * 图片地址
     */
    private String url;

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public DataBean(String title, String url) {
        this.title = title;
        this.url = url;
    }
}

3.2、定义一个adapter 继承CommonRecyclerAdapter放入数据源实现其抽象方法

public class MyAdapter extends CommonRecyclerAdapter<DataBean> {

    public MyAdapter(Context context, int itemLayoutId, List<DataBean> list) {
        super(context, itemLayoutId, list);
    }

    @Override
    public void convert(RecyclerHolder holder, DataBean item, int position) {

    }
}

其中关联布局可放在Activity中，个人喜欢放在里面

public class MyAdapter extends CommonRecyclerAdapter<DataBean> {

    public MyAdapter(Context context, List<DataBean> list) {
        super(context, R.layout.list_data_item, list);
    }

    @Override
    public void convert(RecyclerHolder holder, DataBean item, int position) {
        //标题
        String title = item.getTitle();
        holder.setText(R.id.item_title, TextUtils.isEmpty(title) ? "-" : title);//三木判断下返回是否为空
        //图片地址
        String url = item.getUrl();
        holder.setImageByUrl(R.id.item_url, url);
    }
}

主布局中Main2Activity

public class Main2Activity extends AppCompatActivity {

    private RecyclerView recycler;
    private List<DataBean> list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        recycler = (RecyclerView) this.findViewById(R.id.recycler);
        if (list == null) {
            list = new ArrayList<>();
        }
        //模拟10条假数据
        for (int i = 0; i < 10; i++) {
            list.add(new DataBean("android", "http://inews.gtimg.com/newsapp_bt/0/876781763/1000"));
        }
        MyAdapter adapter = new MyAdapter(this, list);
        recycler.setLayoutManager(new LinearLayoutManager(this));
        recycler.setAdapter(adapter);
        adapter.setOnItemClickListener(new CommonRecyclerAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(RecyclerView parent, View view, int position) {
                Toast.makeText(Main2Activity.this,"点击事件"+position,Toast.LENGTH_SHORT).show();
            }
        });
        adapter.setOnItemLongClickListener(new CommonRecyclerAdapter.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(RecyclerView parent, View view, int position) {
                Toast.makeText(Main2Activity.this,"长按事件"+position,Toast.LENGTH_SHORT).show();
                return false;
            }
        });
    }
}

activity_main2.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.v7.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/recycler"/>
</LinearLayout>

item布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    android:layout_height="wrap_content">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/item_title"/>

    <ImageView
        android:layout_marginTop="5dp"
        android:layout_width="wrap_content"
        android:layout_height="100dp"
        android:id="@+id/item_url"/>
</LinearLayout>