SD卡文件浏览器案例

来源：互联网发布：mac os 10.13 开机慢编辑：程序博客网时间：2024/06/05 04:35

布局文件如下：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.example.sdcard_browser.MainActivity"    android:orientation="vertical">    <TextView        android:id="@+id/current_path"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignParentTop="true"/>    <ListView        android:id="@+id/file_browser"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_below="@id/current_path"/>    <Button        android:id="@+id/back"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:background="@drawable/back"        android:layout_alignParentBottom="true"        android:layout_centerHorizontal="true"/></RelativeLayout>

Activity代码：

public class MainActivity extends AppCompatActivity {    //  定义父文件    private File currentParent;    //  存放当前父文件中的所有子文件    private File currentFiles[];    //   用于显示当前父文件的路径    private TextView textView;    //   返回上一层按钮    private Button back;    //   定义ListView用于加载文件列表    private ListView fileListView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        fileListView = (ListView) findViewById(R.id.file_browser);        back = (Button) (Button) findViewById(R.id.back);        textView = (TextView) findViewById(R.id.current_path);        //   获取SD卡目录文件        File root = new File("/mnt/sdcard");        if(root.exists()){            currentParent = root;            //  listFiles()方法可得到当前文件下的所有文件            currentFiles = currentParent.listFiles();            filesInflateView(currentFiles);        }        fileListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                if(currentFiles[position].isFile()) return;                File temp[] = currentFiles[position].listFiles();                if(temp == null || temp.length == 0){                    Toast.makeText(MainActivity.this, "该文件夹为空或不可访问",                            Toast.LENGTH_SHORT).show();                }else{                    currentParent = currentFiles[position];                    currentFiles = temp;                    filesInflateView(currentFiles);                }            }        });        back.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                try {                    //  若当前的父文件的目录不是SD卡目录                    if(!currentParent.getCanonicalPath().equals("/storage/emulated/legacy")){                        currentParent = currentParent.getParentFile();                        currentFiles = currentParent.listFiles();                        filesInflateView(currentFiles);                    }                } catch (IOException e) {                    e.printStackTrace();                }            }        });    }    private void filesInflateView(File currenFiles[]){        List<Map<String,Object>> listItems = new ArrayList<Map<String, Object>>();        for (int i = 0; i < currenFiles.length;i++){            HashMap<String,Object> map = new HashMap<String,Object>();            if(currentFiles[i].isDirectory()){                map.put("icon",R.drawable.file);            }else{                map.put("icon",R.drawable.sun_file);            }            map.put("fileName",currenFiles[i].getName());            listItems.add(map);        }        SimpleAdapter adapter = new SimpleAdapter(this,listItems,R.layout.file_item,                new String[]{"icon","fileName"},new int[]{R.id.fileImage,R.id.fileName});        fileListView.setAdapter(adapter);        try {            textView.setText("当前路径:"+currentParent.getCanonicalPath());        } catch (IOException e) {            e.printStackTrace();        }    }}

运行效果如下：

注：文件夹图片在windows上截的，哈哈~~~

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