RLFileExplorer.java

/**
 * Copyright (c) 2013-2014, Rinc Liu (http://rincliu.com).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.rincliu.library.widget;

import java.io.File;
import java.util.ArrayList;
import com.rincliu.library.util.RLUiUtil;
import com.rincliu.library.R;
import android.content.Context;
import android.graphics.Color;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.TextView;

public class RLFileExplorer extends ViewGroup implements OnItemClickListener {
    private ListView lv = null;

    private String currentPath;

    private String homePath;

    private ArrayList<Item> list = new ArrayList<Item>();

    private Context context;

    private Listener listener;

    private int textColor = Color.BLACK;

    /**
     * @param context
     */
    public RLFileExplorer(Context context) {
        super(context);
        init(context, null);
    }

    /**
     * @param context
     * @param attrs
     */
    public RLFileExplorer(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context, attrs);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        for (int i = 0; i < getChildCount(); i++) {
            View child = getChildAt(i);
            child.layout(0, 0, child.getMeasuredWidth(), child.getMeasuredHeight());
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int childCount = getChildCount();
        for (int i = 0; i < childCount; i++) {
            View child = getChildAt(i);
            child.measure(widthMeasureSpec, heightMeasureSpec);
        }
    }

    private void init(final Context context, AttributeSet attrs) {
        this.context = context;
        View rootView = LayoutInflater.from(context).inflate(R.layout.file_explorer, null);
        lv = (ListView) rootView.findViewById(R.id.lv);
        lv.setAdapter(new BaseAdapter() {
            @Override
            public int getCount() {
                return list.size();
            }

            @Override
            public Object getItem(int position) {
                return list.get(position);
            }

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

            @Override
            public View getView(int position, View convertView, ViewGroup parent) {
                convertView = LayoutInflater.from(context).inflate(R.layout.file_explorer_item, null);
                Item item = list.get(position);
                ImageView iv = (ImageView) convertView.findViewById(R.id.iv);
                iv.setImageResource(item.getIcon());
                TextView tv = (TextView) convertView.findViewById(R.id.tv);
                tv.setTextColor(textColor);
                tv.setText(item.getName());
                return convertView;
            }
        });
        lv.setOnItemClickListener(this);
        this.addView(rootView);
    }

    private void refresh(String path) {
        File[] files = new File(path).listFiles();
        ArrayList<Item> tempList = new ArrayList<Item>(files.length);
        Item parent = new Item();
        parent.setIcon(R.drawable.icon_explorer_folder);
        parent.setName("..");
        tempList.add(parent);
        for (File file : files) {
            Item item = new Item();
            if (file.isDirectory()) {
                item.setIcon(R.drawable.icon_explorer_folder);
            } else {
                item.setIcon(R.drawable.icon_explorer_file);
            }
            item.setName(file.getName());
            item.setPath(file.getPath());
            tempList.add(item);
        }
        if (!list.isEmpty()) {
            list.clear();
        }
        list.addAll(tempList);
        lv.setSelection(0);
    }

    @Override
    public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
        if (position == 0) {
            File fileParent = new File(currentPath).getParentFile();
            if (!currentPath.equals(homePath)) {
                currentPath = fileParent.getAbsolutePath();
                if (listener != null) {
                    listener.onPathChanged(currentPath);
                }
                refresh(currentPath);
            }
        } else {
            String pathx = list.get(position).getPath();
            File file = new File(pathx);
            if (file.canRead()) {
                if (file.isDirectory()) {
                    currentPath = pathx;
                    if (listener != null) {
                        listener.onPathChanged(currentPath);
                    }
                    refresh(currentPath);
                } else {
                    if (listener != null) {
                        listener.onFileSelected(pathx);
                    }
                }
            } else {
                RLUiUtil.toast(context, R.string.cannot_access_file);
            }
        }
    }

    /**
	 *
	 */
    public interface Listener {
        public void onPathChanged(String path);

        public void onFileSelected(String file);
    }

    /**
     * @param listener
     */
    public void setListener(Listener listener) {
        this.listener = listener;
    }

    /**
     * @param color
     */
    public void setTextColor(int color) {
        this.textColor = color;
    }

    public void openPath(String path) {
        homePath = path;
        currentPath = path;
        refresh(currentPath);
    }

    private class Item {
        private int icon;

        private String name;

        private String path;

        public int getIcon() {
            return icon;
        }

        public void setIcon(int icon) {
            this.icon = icon;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public String getPath() {
            return path;
        }

        public void setPath(String path) {
            this.path = path;
        }
    }
}