为RecyclerView添加点击事件、长按事件-CFANZ编程社区

一、准备工作

保存App信息的bean

public class AppInfo {

    public String name;         // 应用名
    public String packageName;  // 应用包名
    public Drawable icon;       // 应用图标

    public boolean isRom;       // 应用的安装位置
    public boolean isUser;      // 系统还是用户应用
}

获取手机所有App的信息
可以了解获取系统信息的相关API

public class AppInfoProvider {

    /**
     * 获取已安装应用
     */
    public static ArrayList<AppInfo> getIntalledApps(Context ctx) {
        PackageManager pm = ctx.getPackageManager();
        List<PackageInfo> installedPackages = pm.getInstalledPackages(0);   // 获取所有已安装的包

        ArrayList<AppInfo> list = new ArrayList<AppInfo>();
        for (PackageInfo packageInfo : installedPackages) {
            AppInfo info = new AppInfo();
            String packageName = packageInfo.packageName;
            ApplicationInfo applicationInfo = packageInfo.applicationInfo;  // 应用信息
            String name = applicationInfo.loadLabel(pm).toString();
            Drawable icon = applicationInfo.loadIcon(pm);

            int uid = applicationInfo.uid;  // 当前应用的标识

            info.packageName = packageName;
            info.name = name + uid;
            info.icon = icon;

            // 状态机, 通过0/1状态来表示是否具备某些属性和功能
            int flags = applicationInfo.flags;  // 获取应用标记
            if ((flags & ApplicationInfo.FLAG_EXTERNAL_STORAGE) == ApplicationInfo.FLAG_EXTERNAL_STORAGE) {
                // 安装在sd
                info.isRom = false;
            } else {
                // 安装在手机内存
                info.isRom = true;
            }

            if ((flags & ApplicationInfo.FLAG_SYSTEM) == ApplicationInfo.FLAG_SYSTEM) {
                // 系统应用
                info.isUser = false;
            } else {
                // 用户应用
                info.isUser = true;
            }

            list.add(info);
        }

        return list;
    }
}

activity_main

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    
    <android.support.v7.widget.RecyclerView
        android:id="@+id/rv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</LinearLayout>

展示App信息的条目布局

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:padding="5dp">

    <ImageView
        android:id="@+id/iv_icon"
        android:layout_width="45dp"
        android:layout_height="45dp"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:src="@mipmap/ic_launcher"/>

    <TextView
        android:id="@+id/tv_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="2dp"
        android:layout_toRightOf="@+id/iv_icon"
        android:singleLine="true"
        android:text="名称"
        android:textColor="#000"
        android:textSize="18sp"/>

    <TextView
        android:id="@+id/tv_location"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/iv_icon"
        android:layout_alignLeft="@+id/tv_name"
        android:layout_marginTop="3dp"
        android:text="手机内存"
        android:textColor="#000"
        android:textSize="16sp"/>

</RelativeLayout>

头布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:orientation="vertical">

    <TextView
        android:id="@+id/tv_head"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#9e9e9e"
        android:padding="5dp"
        android:text="用户应用(0)"
        android:textColor="#fff"
        android:textSize="16sp"/>

</LinearLayout>

二、适配器(★)

事件的添加需要我们手动进行，分别添加点击和长按接口，接口中添加抽象方法，参数为当前布局对象和点击的条目的位置，然后绑定到当前实现的View.OnClickListener接口的onClick()方法中，具体过程请看本篇最后第四章

public class AppAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> implements View.OnClickListener, View.OnLongClickListener {

    public static final int TYPE_HEAD = 0;
    public static final int TYPE_APPS = 1;
    
    // 这里数据源有两个(系统应用列表和用户应用列表)
    private ArrayList<AppInfo> mUserList;   // 所有已安装用户应用的集合
    private ArrayList<AppInfo> mSystemList; // 所有已安装系统应用的集合
    
    public AppAdapter(ArrayList<AppInfo> userList, ArrayList<AppInfo> systemList) {
        mUserList = userList;
        mSystemList = systemList;
    }

    @Override public int getItemViewType(int position) {
        if (position == 0 || position == mUserList.size() + 1) {
            return TYPE_HEAD;
        } else {
            return TYPE_APPS;
        }
    }

    @Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = null;
        RecyclerView.ViewHolder holder = null;

        switch (viewType) {
            case TYPE_HEAD:
                view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item_header, null);
                holder = new HeadHolder(view);
                break;

            case TYPE_APPS:
                view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item_appinfo, null);

                /**
                 * 为展示应用信息的布局添加点击和长按事件监听
                 */
                view.setOnClickListener(this);
                view.setOnLongClickListener(this);

                holder = new AppsHolder(view);
                break;
        }
        
        return holder;
    }

    @Override public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        switch (getItemViewType(position)) {
            case TYPE_HEAD:
                if (0 == position) {
                    ((HeadHolder) holder).tvHead.setText("用户应用(" +mUserList.size() + ")");
                } else {
                    ((HeadHolder) holder).tvHead.setText("系统应用(" + mSystemList.size() + ")");
                }

                break;

            case TYPE_APPS:
                AppInfo info;
                if (position < mUserList.size() + 1) {
                    info = mUserList.get(position - 1);                         // 从用户应用列表中获取应用信息
                } else {
                    info = mSystemList.get(position - mUserList.size() - 2);    // 从系统应用列表中获取应用信息
                }

                // 设置控件内容
                ((AppsHolder) holder).tvName.setText(info.name);
                ((AppsHolder) holder).ivIcon.setImageDrawable(info.icon);

                if (info.isRom) {

                    ((AppsHolder) holder).tvLocation.setText("内置存储卡");
                } else {
                    ((AppsHolder) holder).tvLocation.setText("外部存储卡");
                }

                /**
                 * 将position保存在itemView的Tag中以便点击时获取
                 */
                holder.itemView.setTag(position); 
                break;
        }
    }

    @Override public int getItemCount() {
        return mUserList.size() + mSystemList.size() + 2; // 加上两条头布局条目
    }
    

    /****************************************
     * Holder
     */
    class HeadHolder extends RecyclerView.ViewHolder {

        @BindView(R.id.tv_head) TextView tvHead;

        public HeadHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);
        }
    }

    class AppsHolder extends RecyclerView.ViewHolder {

        @BindView(R.id.tv_name) TextView tvName;
        @BindView(R.id.iv_icon) ImageView ivIcon;
        @BindView(R.id.tv_location) TextView tvLocation;

        public AppsHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);
        }
    }


    /****************************************
     * Listener
     */
    /**
     * 手动添加点击事件
     */
    interface OnClickListener {
        void onClick(View view, int position);
    }
    
    private OnClickListener mOnClickListener = null;
    
    public void setOnClickListener(OnClickListener listener) {
        mOnClickListener = listener;
    }
    
    @Override public void onClick(View view) {
        if (null != mOnClickListener) {
            mOnClickListener.onClick(view, (int) view.getTag());
        }
    }
    
    /**
     * 手动添加长按事件
     */
    interface OnLongClickListener {
        void onLongClick(View view, int position);
    }
    private OnLongClickListener mOnLongClickListener = null;
    public void setOnLongClickListener(OnLongClickListener listener) {
        mOnLongClickListener = listener;
    }
    @Override public boolean onLongClick(View view) {
        if (null != mOnLongClickListener) {
            mOnLongClickListener.onLongClick(view, (int) view.getTag());
        }

        // 消耗事件，否则长按逻辑执行完成后还会进入点击事件的逻辑处理
        return true;    
    }
}

三、Activity中使用

重点看setAdapter之后的点击和长按事件的具体处理逻辑即可

public class AppsActivity extends AppCompatActivity {

    @BindView(R.id.rv) RecyclerView rv;
    private AppAdapter mAdapter;

    private LinearLayoutManager mLayoutManager;

    @Override protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_apps);
        ButterKnife.bind(this);

        initData(); // 初始化数据

        rv.setHasFixedSize(true);
        mLayoutManager = new LinearLayoutManager(this);
        rv.setLayoutManager(mLayoutManager);
        rv.setItemAnimator(new DefaultItemAnimator());

        mAdapter = new AppAdapter(mUserList, mSystemList);
        rv.setAdapter(mAdapter);

        /**
         * 点击和长按事件的具体处理
         */
        mAdapter.setOnClickListener(new AppAdapter.OnClickListener() {
            @Override public void onClick(View view, int position) {
                if (position < mUserList.size() + 1) {
                    Toast.makeText(AppsActivity.this, mUserList.get(position - 1).name, Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(AppsActivity.this, mSystemList.get(position - mUserList.size() - 2).name, Toast.LENGTH_SHORT).show();
                }
            }
        });
        mAdapter.setOnLongClickListener(new AppAdapter.OnLongClickListener() {
            @Override public void onLongClick(View view, int position) {
                if (position < mUserList.size() + 1) {
                    Toast.makeText(AppsActivity.this, "长按" + mUserList.get(position - 1).name, Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(AppsActivity.this, "长按" + mSystemList.get(position - mUserList.size() - 2).name, Toast.LENGTH_SHORT).show();
                }
            }
        });
    }

    
    private ArrayList<AppInfo> mList;       // 所有已安装应用的集合
    private ArrayList<AppInfo> mUserList;   // 所有已安装用户应用的集合
    private ArrayList<AppInfo> mSystemList; // 所有已安装系统应用的集合

    private void initData() {
        mList = AppInfoProvider.getIntalledApps(getApplicationContext());

        // 区分用户和系统应用,分别放在两个集合中
        mUserList = new ArrayList<AppInfo>();
        mSystemList = new ArrayList<AppInfo>();
        for (AppInfo info : mList) {
            if (info.isUser) {
                mUserList.add(info);
            } else {
                mSystemList.add(info);
            }
        }
    }
}