Android SD 卡文件浏览器

本文参考文献：《疯狂Android讲义 : 第2版》

主布局文件：

<?xml version="1.0" encoding="utf-8"?>

列表项布局文件 line.xml 的内容：

<?xml version="1.0" encoding="utf-8"?>

主程序文件的内容如下：

package com.toby.personal.testlistview;import android.os.Bundle;import android.os.Environment;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.View;import android.widget.AdapterView;import android.widget.Button;import android.widget.ListView;import android.widget.SimpleAdapter;import android.widget.TextView;import android.widget.Toast;import java.io.File;import java.io.IOException;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;public class MainActivity extends AppCompatActivity {    final private static String TAG = "Toby_Test";    ListView listView;    TextView textView;    File currentParent;    File[] currentFiles;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        listView = (ListView) findViewById(R.id.list);        textView = (TextView) findViewById(R.id.path);        Log.d(TAG, Environment.getExternalStorageDirectory().getPath());        File root = new File("/mnt/");        if (root.exists()) {            currentParent = root;            currentFiles = root.listFiles();            inflateListView(currentFiles);        }        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                if (currentFiles[position].isFile()) {                    return;                }                File[] tmp = currentFiles[position].listFiles();                if (tmp == null || tmp.length == 0) {                    Toast.makeText(MainActivity.this, "Current path is null.",                            Toast.LENGTH_SHORT).show();                } else {                    currentParent = currentFiles[position];                    currentFiles = tmp;                    inflateListView(currentFiles);                }            }        });        Button parent = (Button) findViewById(R.id.parent);        parent.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                try {                    if (!currentParent.getCanonicalPath().equals("/mnt/")) {                        currentParent = currentParent.getParentFile();                        currentFiles = currentParent.listFiles();                        inflateListView(currentFiles);                    }                } catch (IOException e) {                    e.printStackTrace();                }            }        });    }    private void inflateListView(File[] files) {        if (files == null || files.length <= 0) {            return;        }        List> listItems = new ArrayList<>();        for (File file : files) {            Map listItem = new HashMap<>();            listItem.put("icon", file.isDirectory() ? R.drawable.folder : R.drawable.file);            listItem.put("fileName", file.getName());            listItems.add(listItem);        }        SimpleAdapter simpleAdapter = new SimpleAdapter(this, listItems, R.layout.line,                new String[]{"icon", "fileName"}, new int[]{R.id.icon, R.id.file_name});        listView.setAdapter(simpleAdapter);        try {            textView.setText(String.format("Current Path: %s", currentParent.getCanonicalPath()));        } catch (IOException e) {            e.printStackTrace();        }    }}

运行效果：

显示效果

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