hzuapps#88 hzuapps#89 hzuapps#90 hzuapps#95 hzuapps#971 全部实验

app/src/main/java/edu/hzuapps/androidworks/homeworks/net1314080903218/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+	package="org.crazyit.io"
+	android:versionCode="1"
+	android:versionName="1.0">
+	<uses-sdk
+		android:minSdkVersion="10"
+		android:targetSdkVersion="17" />
+	<application android:icon="@drawable/ic_launcher" android:label="@string/app_name">
+		<activity android:name=".SDFileExplorer"
+				android:label="@string/app_name">
+		        	<intent-filter>
+				<action android:name="android.intent.action.MAIN" />
+				<category android:name="android.intent.category.LAUNCHER" />
+			</intent-filter>
+		</activity>
+
+	</application>
+
+
+</manifest> 

app/src/main/java/edu/hzuapps/androidworks/homeworks/net1314080903218/Net1314080903218SDFileExplorer.java

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+package edu.hzuapps.androidworks.homeworks.Net134080903218;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.AdapterView;
+import android.widget.AdapterView.OnItemClickListener;
+import android.widget.Button;
+import android.widget.ListView;
+import android.widget.SimpleAdapter;
+import android.widget.TextView;
+import android.widget.Toast;
+
+
+public class Net1314080903218SDFileExplorer extends Activity
+{
+	ListView listView;
+	TextView textView;
+	// 记录当前的父文件夹
+	File currentParent;
+	// 记录当前路径下的所有文件的文件数组
+	File[] currentFiles;
+
+	@Override
+	public void onCreate(Bundle savedInstanceState)
+	{
+		super.onCreate(savedInstanceState);
+		setContentView(R.layout.Net1314080903218main);
+         		// 获取列出全部文件的ListView
+		listView = (ListView) findViewById(R.id.list);
+		textView = (TextView) findViewById(R.id.path);
+		// 获取系统的SD卡的目录
+		File root = new File("/mnt/sdcard/");
+		// 如果 SD卡存在
+		if (root.exists())
+		{
+			currentParent = root;
+			currentFiles = root.listFiles();
+			// 使用当前目录下的全部文件、文件夹来填充ListView
+			inflateListView(currentFiles);
+		}
+		// 为ListView的列表项的单击事件绑定监听器
+		listView.setOnItemClickListener(new OnItemClickListener()
+		{
+			@Override
+			public void onItemClick(AdapterView<?> parent, View view,
+				int position, long id)
+			{
+				// 用户单击了文件，直接返回，不做任何处理
+				if (currentFiles[position].isFile()) return;
+				// 获取用户点击的文件夹下的所有文件
+				File[] tmp = currentFiles[position].listFiles();
+				if (tmp == null || tmp.length == 0)
+				{
+					Toast.makeText(SDFileExplorer.this
+						, "当前路径不可访问或该路径下没有文件",
+						Toast.LENGTH_SHORT).show();
+				}
+				else
+				{
+					// 获取用户单击的列表项对应的文件夹，设为当前的父文件夹
+					currentParent = currentFiles[position]; //②
+					// 保存当前的父文件夹内的全部文件和文件夹
+					currentFiles = tmp;
+					// 再次更新ListView
+					inflateListView(currentFiles);
+				}
+			}
+		});
+		// 获取上一级目录的按钮
+		Button parent = (Button) findViewById(R.id.parent);
+		parent.setOnClickListener(new OnClickListener()
+		{
+			@Override
+			public void onClick(View source)
+			{
+				try
+				{
+					if (!currentParent.getCanonicalPath()
+						.equals("/mnt/sdcard"))
+					{
+						// 获取上一级目录
+						currentParent = currentParent.getParentFile();
+						// 列出当前目录下所有文件
+						currentFiles = currentParent.listFiles();
+						// 再次更新ListView
+						inflateListView(currentFiles);
+					}
+				}
+				catch (IOException e)
+				{
+					e.printStackTrace();
+				}
+			}
+		});
+	}
+
+	private void inflateListView(File[] files) //①
+	{
+		// 创建一个List集合，List集合的元素是Map
+		List<Map<String, Object>> listItems = 
+			new ArrayList<Map<String, Object>>();
+		for (int i = 0; i < files.length; i++)
+		{
+			Map<String, Object> listItem = 
+				new HashMap<String, Object>();
+			// 如果当前File是文件夹，使用folder图标；否则使用file图标
+			if (files[i].isDirectory())
+			{
+				listItem.put("icon", R.drawable.folder);
+			}
+			else
+			{
+				listItem.put("icon", R.drawable.file);
+			}
+			listItem.put("fileName", files[i].getName());
+			// 添加List项
+			listItems.add(listItem);
+		}
+		// 创建一个SimpleAdapter
+		SimpleAdapter simpleAdapter = new SimpleAdapter(this
+			, listItems, R.layout.line
+			, new String[]{ "icon", "fileName" }
+			, new int[]{R.id.icon, R.id.file_name });
+		// 为ListView设置Adapter
+		listView.setAdapter(simpleAdapter);
+		try
+		{
+			textView.setText("当前路径为：" 
+				+ currentParent.getCanonicalPath());
+		}
+		catch (IOException e)
+		{
+			e.printStackTrace();
+		}
+	}
+}