android - 如何在 android 中读取本地 Pdf、XlS、DOC 文件

Question

我正在尝试创建一个项目，我需要我的应用程序在其中读取本地存储的 pdf、doc、xls 文件。

我不知道该怎么做。我想在我的 web 视图中显示所有本地存储的文件。是否有任何库来呈现这些文件或任何其他方式来做到这一点？如果有人可以指导我，那将是我的荣幸。

Answer 1

package com.cdn.file;

import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class FileExplorerActivity extends Activity {
    /** Called when the activity is first created. */
    private Button buttonList, buttonBack;
    // Stores names of traversed directories
    ArrayList<String> str = new ArrayList<String>();
    // Check if the first level of the directory structure is the one showing

    private static final String TAG = "F_PATH";
    private List<Item> fileList;
    private Item item;
    private File path = new File(Environment.getExternalStorageDirectory() + "");
    private String chosenFile = "";

    ListView listViewDir;
    ListAdapter adapter;
    ListFile listFileAdaptor;
    int value = 0;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        listViewDir = (ListView) findViewById(R.id.listViewDir);

        buttonBack = (Button) findViewById(R.id.buttonBack);
        buttonBack.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {


            }
        });

        buttonList = (Button) findViewById(R.id.buttonList);
        buttonList.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {

                if (isSdPresent()) {
                    Toast.makeText(FileExplorerActivity.this, "Un Mounted",
                            Toast.LENGTH_SHORT).show();
                    loadFileList();
                    listFileAdaptor = new ListFile(FileExplorerActivity.this,
                            fileList);
                    listViewDir.setAdapter(listFileAdaptor);


                }

                else {
                    Toast.makeText(FileExplorerActivity.this, "Mounted",
                            Toast.LENGTH_SHORT).show();
                }

            }

        });

        listViewDir.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
            //  if (value == 0) {
                    chosenFile = fileList.get(position).getFile();
                /*} else {
                    chosenFile = backList.get(position).getFile();
                    value =0;
                }*/
                File sel = new File(path + "/" + chosenFile);

                Log.v("Prashant111 ==", sel.toString());
                Log.v("Prashant222 ==", "" + sel.toURI());

                if (sel.isDirectory()) {

                    // Adds chosen directory to list
                    str.add(chosenFile);

                    path = new File(sel + "");

                    loadFileList();
                    listFileAdaptor = new ListFile(FileExplorerActivity.this,
                            fileList);
                    listViewDir.setAdapter(listFileAdaptor);


                    // Log.d(TAG, path.getAbsolutePath());

                    Log.d("Prashant333 ==", "" + path.toURI());

                    Log.d("Prashant444 ==", "" + path.toString());

                }

                // Checks if 'up' was clicked

                // File picked
                else {
                    Intent intent = new Intent(Intent.ACTION_VIEW);
                    Uri uri = Uri.fromFile(new File(chosenFile));
                    intent.putExtra(Intent.ACTION_VIEW, uri);
                    Intent chooser = Intent.createChooser(intent, "Prashant");
                    startActivity(chooser);

                }

            }
        });
    }

    public static boolean isSdPresent() {
        return android.os.Environment.getExternalStorageState().equals(
                android.os.Environment.MEDIA_MOUNTED);

    }

    private class Item {
        public String file;
        public int icon;

        public String getFile() {
            return file;
        }

        public void setFile(String file) {
            this.file = file;
        }

        public int getIcon() {
            return icon;
        }

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

    }

    private void loadFileList() {
        try {
            path.mkdirs();
        } catch (SecurityException e) {
            Log.e(TAG, "unable to write on the sd card ");
        }

        // Checks whether path exists
        if (path.exists()) {
            FilenameFilter filter = new FilenameFilter() {
                @Override
                public boolean accept(File dir, String filename) {
                    File sel = new File(dir, filename);
                    // Filters based on whether the file is hidden or not
                    return (sel.isFile() || sel.isDirectory())
                            && !sel.isHidden();

                }
            };

            String[] fList = path.list(filter);
            fileList = new ArrayList<FileExplorerActivity.Item>();

            for (int i = 0; i < fList.length; i++) {
                item = new Item();
                item.setIcon(R.drawable.file_icon);
                item.setFile(fList[i]);
                // fileList.add(item);
                // Convert into file path
                File sel = new File(path, fList[i]);

                Log.v("sel ====", sel.toString());

                String name = sel.getName();

                // Set drawables
                if (sel.isDirectory()) {
                    item.setFile(name);
                    item.setIcon(R.drawable.directory_icon);
                    fileList.add(item);

                } else {
                    if (name.endsWith(".mp4") || name.endsWith(".3gp")) {
                        Log.v("aaaaaaaaaaa", name);
                        item.setFile(name);
                        item.setIcon(R.drawable.icon);
                        fileList.add(item);
                    } else {

                        fileList.remove(item);
                    }
                }
            }

        } else {
            Log.e(TAG, "path does not exist");
        }

    }

    class ViewHolder {
        TextView textViewName;
        ImageView view;
    }

    class ListFile extends BaseAdapter {
        List<Item> fileList;
        private LayoutInflater inflator;
        Context context;

        ListFile(Context context, List<Item> fileList) {
            this.fileList = fileList;
            this.context = context;
            inflator = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        }

        @Override
        public int getCount() {

            return fileList.size();
        }

        @Override
        public Object getItem(int position) {

            return fileList.get(position);
        }

        @Override
        public long getItemId(int position) {

            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder;
            if (convertView == null) {
                if (getItemViewType(position) == 0) {
                    convertView = inflator.inflate(R.layout.file_list, null);
                }

                holder = new ViewHolder();

                holder.textViewName = (TextView) convertView
                        .findViewById(R.id.textView1);
                holder.view = (ImageView) convertView
                        .findViewById(R.id.imageView1);

                convertView.setTag(holder);
                // Set the display text
            } else {
                holder = (ViewHolder) convertView.getTag();
            }
            holder.textViewName.setText(fileList.get(position).getFile());

            holder.view.setImageResource((fileList.get(position).getIcon()));

            return convertView;
        }
    }
}

尝试使用此代码。我正在拍摄视频文件，但您可以指定所需的文件类型。