android简易文件管理器实例(列表式文件目录)

核心代码：

File fatherFile = new File(path);File[] files = fatherFile.listFiles();

效果图：

实现这种列表式的目录，用直接读取目录下文件方法会比较简单，但是如果要根据文件类型从所有文件中分类，那就用ContentProvider去查询数据库方式会更有效率；

实现代码：

FileListActivity.java

package com.example.d_readandwritetextfile;

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

import com.example.d_readandwritetextfile.entity.FileEntity;
import com.example.d_readandwritetextfile.entity.FileEntity.Type;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
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.ListView;
import android.widget.TextView;
import android.widget.Toast;

/**
 * 文件列表 界面
 * @author Administrator
 *
 */
public class FileListActivity extends Activity implements OnClickListener{

	private ListView mListView;
	private Button btnComfirm;
	private MyFileAdapter mAdapter;
	private Context mContext;
	private File currentFile;
	String sdRootPath;

	private ArrayList<FileEntity> mList;

	private Handler mHandler;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_filelist);
		mHandler = new Handler(){
			@Override
			public void handleMessage(Message msg) {
				super.handleMessage(msg);
				switch (msg.what) {
				case 1:
					if(mAdapter ==null){
						mAdapter = new MyFileAdapter(mContext, mList);
						mListView.setAdapter(mAdapter);
					}else{
						mAdapter.notifyDataSetChanged();
					}

					break;
				case 2:

					break;

				default:
					break;
				}
			}
		};

		mContext = this;
		mList = new ArrayList<>();
		sdRootPath =Environment.getExternalStorageDirectory().getAbsolutePath();
		currentFile = new File(sdRootPath);
		System.out.println(sdRootPath);
		initView();
		getData(sdRootPath);

	}

	@Override
	public void onBackPressed() {
//		super.onBackPressed();
		System.out.println("onBackPressed...");
		if(sdRootPath.equals(currentFile.getAbsolutePath())){
			System.out.println("已经到了根目录...");
			return ;
		}

		String parentPath = currentFile.getParent();
		currentFile = new File(parentPath);
		getData(parentPath);
	}

	private void initView() {
		mListView = (ListView) findViewById(R.id.listView1);
		btnComfirm = (Button) findViewById(R.id.button1);

		mListView.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				final FileEntity entity = mList.get(position);
				if(entity.getFileType() == Type.FLODER){
					currentFile = new File(entity.getFilePath());
					getData(entity.getFilePath());
				}else if(entity.getFileType() == Type.FILE){

					runOnUiThread(new Runnable() {

						@Override
						public void run() {
							Toast.makeText(mContext, entity.getFilePath()+" "+entity.getFileName(),
									1).show();
						}
					});
				}

			}
		});
	}

	private void getData(final String path) {
		new Thread(){
			@Override
			public void run() {
				super.run();

				findAllFiles(path);
			}
		}.start();

	}

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.button1:
			setResult(100);
			finish();
			break;

		default:
			break;
		}

	}

	/**
	 * 查找path地址下所有文件
	 * @param path
	 */
	public void findAllFiles(String path) {
		mList.clear();

		if(path ==null ||path.equals("")){
			return;
		}
		File fatherFile = new File(path);
		File[] files = fatherFile.listFiles();
		if (files != null && files.length > 0) {
			for (int i = 0; i < files.length; i++) {
				FileEntity entity = new FileEntity();
				boolean isDirectory = files[i].isDirectory();
				if(isDirectory ==true){
					entity.setFileType(Type.FLODER);
//					entity.setFileName(files[i].getPath());
				}else{
					entity.setFileType(Type.FILE);
				}
				entity.setFileName(files[i].getName().toString());
				entity.setFilePath(files[i].getAbsolutePath());
				entity.setFileSize(files[i].length()+"");
				mList.add(entity);
			}
		}
		mHandler.sendEmptyMessage(1);

	}

	class MyFileAdapter extends BaseAdapter {
		private Context mContext;
		private ArrayList<FileEntity> mAList;
		private LayoutInflater mInflater;

		public MyFileAdapter(Context mContext, ArrayList<FileEntity> mList) {
			super();
			this.mContext = mContext;
			this.mAList = mList;
			mInflater = LayoutInflater.from(mContext);
		}

		@Override
		public int getCount() {
			// TODO Auto-generated method stub
			return mAList.size();
		}

		@Override
		public Object getItem(int position) {
			// TODO Auto-generated method stub
			return mAList.get(position);
		}

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

		@Override
		public int getItemViewType(int position) {
			if(mAList.get(position).getFileType() == Type.FLODER){
				return 0;
			}else{
				return 1;
			}
		}

		@Override
		public int getViewTypeCount() {
			return 2;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
//			System.out.println("position-->"+position+"  ---convertView--"+convertView);
			ViewHolder holder = null;
			int type = getItemViewType(position);
			FileEntity entity = mAList.get(position);

			if(convertView == null){
				holder = new ViewHolder();
				switch (type) {
				case 0://folder
					convertView = mInflater.inflate(R.layout.item_listview, parent, false);
					holder.iv = (ImageView) convertView.findViewById(R.id.item_imageview);
					holder.tv = (TextView) convertView.findViewById(R.id.item_textview);
					break;
				case 1://file
					convertView = mInflater.inflate(R.layout.item_listview, parent, false);
					holder.iv = (ImageView) convertView.findViewById(R.id.item_imageview);
					holder.tv = (TextView) convertView.findViewById(R.id.item_textview);

					break;

				default:
					break;

				}
				convertView.setTag(holder);
			}else {
				holder = (ViewHolder) convertView.getTag();
			}

			switch (type) {
			case 0:
				holder.iv.setImageResource(R.drawable.folder_125);
				holder.tv.setText(entity.getFileName());
				break;
			case 1:
				holder.iv.setImageResource(R.drawable.file);
				holder.tv.setText(entity.getFileName());

				break;

			default:
				break;
			}

			return convertView;
		}

	}

	class ViewHolder {
		ImageView iv;
		TextView tv;
	}

}

FileEntity.java

package com.example.d_readandwritetextfile.entity;

public class FileEntity {

	public enum Type{
		FLODER,FILE
	}
	private String filePath;
	private String fileName;
	private String fileSize;
	private Type fileType;

	public String getFilePath() {
		return filePath;
	}
	public void setFilePath(String filePath) {
		this.filePath = filePath;
	}
	public String getFileName() {
		return fileName;
	}
	public void setFileName(String fileName) {
		this.fileName = fileName;
	}
	public String getFileSize() {
		return fileSize;
	}
	public void setFileSize(String fileSize) {
		this.fileSize = fileSize;
	}
	public Type getFileType() {
		return fileType;
	}
	public void setFileType(Type fileType) {
		this.fileType = fileType;
	}

}

activity_filelist.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:orientation="vertical" >

  <RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="60dp" >

    <Button
      android:id="@+id/button1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignParentBottom="true"
      android:layout_alignParentRight="true"
      android:layout_marginRight="14dp"
      android:onClick="onClick"
      android:text="确定" />

    <View
      android:layout_width="match_parent"
      android:layout_height="1dp"
      android:background="#666"
      android:layout_alignParentBottom="true"
      />

  </RelativeLayout>

  <ListView
    android:id="@+id/listView1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >
  </ListView>

</LinearLayout>

item_listview.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="50dp"
  android:orientation="horizontal" >

  <ImageView
    android:id="@+id/item_imageview"
    android:layout_width="50dp"
    android:layout_height="50dp"
    android:layout_marginLeft="10dp"
    android:src="@drawable/folder_125"
    android:scaleType="fitXY"
    />

  <TextView
    android:id="@+id/item_textview"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_marginLeft="10dp"
    android:text="TextView"
    android:gravity="center"
     />

</LinearLayout>

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