Android开发之文件微端

源码下载地址：

该文件微端极易扩展，文件微端实现的功能是：主UI显示用户选择的文件的路径。

完成这一功能的主要是FXExplore.java文件。如下图解析：

2f4d8639bc4203b04bed70bab8b5b36f.jpg (41.6 KB, 下载次数: 43)

下载附件

2018-2-1 10:34 上传

主SelectFilesActivity.java文件

package com.example.com.njupt.zhb.selectfiles;

import android.os.Bundle;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
/*
 @作者：郑海波 
 */
public class SelectFilesActivity extends Activity {
    private Button selectBtn;
    private TextView pathView;
    private static final String DYNAMICACTION = "njupt.zhb.sendpath";
    private OnClickListener listener=null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_select_files);
        listener=new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				Intent intent=new Intent(SelectFilesActivity.this,FSExplorer.class);
				startActivity(intent);
			}
		};
		selectBtn=(Button)findViewById(R.id.selectFilesBtn);
		pathView=(TextView)findViewById(R.id.filepath);
		selectBtn.setOnClickListener(listener);
		IntentFilter filter_dynamic = new IntentFilter();
		filter_dynamic.addAction(DYNAMICACTION);
		registerReceiver(dynamicReceiver, filter_dynamic);
    }
    // 2 自定义动态广播接收器，内部类,接收选择的路径
 	private BroadcastReceiver dynamicReceiver = new BroadcastReceiver() {
 		
 		@Override
 		public void onReceive(Context context, Intent intent) {
 			Log.e("MainActivity", "接收自定义动态注册广播消息");
 			if(intent.getAction().equals(DYNAMICACTION)){
 				String path = intent.getStringExtra("path");
 				Toast.makeText(context, path, Toast.LENGTH_SHORT).show();
 				String text="Path:"+path;
 				pathView.setText(text);
 			}
 		}
 	};
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_select_files, menu);
        return true;
    }
}

FXExplore.java文件

package com.example.com.njupt.zhb.selectfiles;
import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.R.string;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
/*
@作者：郑海波 
参考：Google Android开发入门与实战
*/
public class FSExplorer extends Activity implements OnItemClickListener {
	private static final String TAG = "FSExplorer";
	private static final int IM_PARENT = Menu.FIRST + 1;
	private static final int IM_BACK = IM_PARENT + 1;
	private static final String DYNAMICACTION = "njupt.zhb.sendpath";
	ListView itemlist = null;
	String path = "/";
	List<Map<String, Object>> list;
	public void sendPathToActivity(String path){
		Intent intent = new Intent();
		intent.setAction(DYNAMICACTION);
		intent.putExtra("path", path);
		sendBroadcast(intent);
	}
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.files);
		setTitle("文件微端");
		itemlist = (ListView) findViewById(R.id.itemlist);
		refreshListItems(path);
	}
    /*根据path更新路径列表*/
	private void refreshListItems(String path) {
		setTitle("文件微端 > "+path);
		list = buildListForSimpleAdapter(path);
		SimpleAdapter notes = new SimpleAdapter(this, list, R.layout.file_row,
				new String[] { "name", "path" ,"img"}, new int[] { R.id.name,
						R.id.desc ,R.id.img});
		itemlist.setAdapter(notes);
		itemlist.setOnItemClickListener(this);
		itemlist.setSelection(0);
	}
    /*根据路径生成一个包含路径的列表*/
	private List<Map<String, Object>> buildListForSimpleAdapter(String path) {
		File[] files = new File(path).listFiles();
		List<Map<String, Object>> list = new ArrayList<Map<String, Object>>(files.length);
		Map<String, Object> root = new HashMap<String, Object>();
		root.put("name", "/");
		root.put("img", R.drawable.file_root);
		root.put("path", "go to root directory");
		list.add(root);
		Map<String, Object> pmap = new HashMap<String, Object>();
		pmap.put("name", "..");
		pmap.put("img", R.drawable.file_paranet);
		pmap.put("path", "go to paranet Directory");
		list.add(pmap);
		for (File file : files){
			Map<String, Object> map = new HashMap<String, Object>();
			if(file.isDirectory()){
				map.put("img", R.drawable.directory);
			}else{
				map.put("img", R.drawable.file_doc);
			}
			map.put("name", file.getName());
			map.put("path", file.getPath());
			list.add(map);
		}
		return list;
	}
	/*跳转到上一层*/
	private void goToParent() {
		File file = new File(path);
		File str_pa = file.getParentFile();
		if(str_pa == null){
			Toast.makeText(FSExplorer.this,
					"已经是根目录",
					Toast.LENGTH_SHORT).show();
			refreshListItems(path);	
		}else{
			path = str_pa.getAbsolutePath();
			refreshListItems(path);	
		}
	}
    /*实现OnItemClickListener接口*/
	@Override
	public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
		Log.i(TAG, "item clicked! [" + position + "]");
		if (position == 0) {
			path = "/";
			refreshListItems(path);
		}else if(position == 1){
			goToParent();
		} else {
			path = (String) list.get(position).get("path");
			File file = new File(path);
			if (file.isDirectory())
				refreshListItems(path);
			else
			{
				Toast.makeText(FSExplorer.this,path,Toast.LENGTH_SHORT).show();
				sendPathToActivity(path);
				finish();
			}
			
		}

	}

}

Files.xml文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android=""
	android:orientation="vertical" android:layout_width="fill_parent"
	android:layout_height="fill_parent">

	<ListView 
	    android:layout_width="fill_parent"
		android:layout_height="fill_parent" 
		android:id="@+id/itemlist" />
</LinearLayout>

File_row.xml文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android=""
    android:id="@+id/vw1"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:padding="4px"
    android:orientation="horizontal">    

    <ImageView android:id="@+id/img"
        android:layout_width="32px"
        android:layout_margin="4px"
        android:layout_height="32px"/>
 
   <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView android:id="@+id/name"
            android:textSize="18sp"
            android:textStyle="bold"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"/>

        <TextView android:id="@+id/desc"
            android:textSize="14sp"
            android:layout_width="fill_parent"
            android:paddingLeft="10px"
            android:layout_height="wrap_content"/>

    </LinearLayout>

</LinearLayout>

AndroidManifest.xml文件