編輯:Android開發教程
此案例主要說的是Android使用GridView加載SD卡下所有目錄,文件夾多層遍歷,文件圖標修改,設置文件對應打開方式等功能。
如圖:
代碼:
public class GridViewFile extends Activity implements View.OnClickListener { private Context context; private TextView tv_title, textView; private GridView listView; private final String MUSIC_PATH = "/"; // 記錄當前路徑下 的所有文件的數組 File currentParent; // 記錄當前路徑下的所有文件的文件數組 File[] currentFiles; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); context = this; initView(); } public void initView() { findViewById(R.id.public_top_img_close).setOnClickListener(this); listView = (GridView) findViewById(R.id.gridview); textView = (TextView) findViewById(R.id.llss); onLoad(); } public void onLoad() { ListSongsName(); } private void ListSongsName() { // 獲取系統的SD卡目錄 File root = new File(MUSIC_PATH); // 如果SD卡存在 if (root.exists()) { currentParent = root; currentFiles = root.listFiles();// 獲取root目錄下的所有文件 // 使用當前陸慕下的全部文件,文件夾來填充ListView inflateListView(currentFiles); } // 為ListView的列表項的單擊事件綁定監視器 listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // 用戶點擊了文件,則調用手機已安裝軟件操作該文件 if (currentFiles[position].isFile()) { onError(currentFiles[position].getPath() + "1"); Intent intent = OpenFile.openFile(currentFiles[position] .getPath()); startActivity(intent); } else { // 獲取currentFiles[position]路徑下的所有文件 File[] tmp = currentFiles[position].listFiles(); if (tmp == null || tmp.length == 0) { Toast.makeText(GridViewFile.this, "空文件夾!", Toast.LENGTH_SHORT).show(); }// if else { // 獲取用戶單擊的列表項對應的文件夾,設為當前的父文件夾 currentParent = currentFiles[position]; // 保存當前文件夾內的全部問價和文件夾 currentFiles = tmp; inflateListView(currentFiles); } } } }); } // 更新列表 private void inflateListView(File[] files) { if (files.length == 0) Toast.makeText(GridViewFile.this, "sd卡不存在", Toast.LENGTH_SHORT) .show(); else { // 創建一個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>(); // 如果當前File是文件夾,使用folder圖標;否則使用file圖標 Log.i("path", files[i].getPath()); Log.i("path", files[i].getName()); if (files[i].isDirectory()) listItem.put("icon", R.drawable.file_wenjianjia); // else if(files[i].isFi) else listItem.put("icon", R.drawable.file_wenjian1); listItem.put("fileName", files[i].getName()); // 添加List項 listItems.add(listItem); } // 創建一個SimpleAdapter SimpleAdapter simpleAdapter = new SimpleAdapter(this, listItems, R.layout.acheshi_item, new String[] { "icon", "fileName" }, new int[] { R.id.imageView1, R.id.text_path }); // 位ListView設置Adpter listView.setAdapter(simpleAdapter); try { textView.setText("當前路徑為:" + currentParent.getCanonicalPath()); } catch (IOException e) { e.printStackTrace(); } } } @Override public void onClick(View v) { onbey(); } // 返回上層菜單 private void onbey() { try { if (!MUSIC_PATH.equals(currentParent.getCanonicalPath())) { // 獲取上一層目錄 currentParent = currentParent.getParentFile(); // 列出當前目錄下的所有文件 currentFiles = currentParent.listFiles(); // 再次更新ListView inflateListView(currentFiles); } else { new AlertDialog.Builder(this) .setIcon(R.drawable.ic_launcher) .setTitle("提示") .setMessage("確定要退出嗎?") .setPositiveButton("確定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { finish(); } }) .setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { } }).create().show(); } } catch (Exception e) { e.printStackTrace(); } } public void onError(Object error) { Toast.makeText(getApplicationContext(), error + "", Toast.LENGTH_LONG) .show(); } protected void onDestroy() { super.onDestroy(); } }
/** * 根據路徑調用系統對應的應用打開文件 */ public class OpenFile { public static Intent openFile(String filePath){ File file = new File(filePath); if(!file.exists()) return null; /* 取得擴展名 */ String end=file.getName().substring(file.getName().lastIndexOf(".") + 1,file.getName().length()).toLowerCase(); /* 依擴展名的類型決定MimeType */ if(end.equals("m4a")||end.equals("mp3")||end.equals("mid")|| end.equals("xmf")||end.equals("ogg")||end.equals("wav")){ return getAudioFileIntent(filePath); }else if(end.equals("3gp")||end.equals("mp4")){ return getAudioFileIntent(filePath); }else if(end.equals("jpg")||end.equals("gif")||end.equals("png")|| end.equals("jpeg")||end.equals("bmp")){ return getImageFileIntent(filePath); }else if(end.equals("apk")){ return getApkFileIntent(filePath); }else if(end.equals("ppt")){ return getPptFileIntent(filePath); }else if(end.equals("xls")){ return getExcelFileIntent(filePath); }else if(end.equals("doc")){ return getWordFileIntent(filePath); }else if(end.equals("pdf")){ return getPdfFileIntent(filePath); }else if(end.equals("chm")){ return getChmFileIntent(filePath); }else if(end.equals("txt")){ return getTextFileIntent(filePath,false); }else{ return getAllIntent(filePath); } } //Android獲取一個用於打開APK文件的intent public static Intent getAllIntent( String param ) { Intent intent = new Intent(); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); intent.setAction(android.content.Intent.ACTION_VIEW);//動作 Uri uri = Uri.fromFile(new File(param ));//轉換類型 intent.setDataAndType(uri,"*/*"); return intent; } //Android獲取一個用於打開APK文件的intent public static Intent getApkFileIntent( String param ) { Intent intent = new Intent(); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); intent.setAction(android.content.Intent.ACTION_VIEW); Uri uri = Uri.fromFile(new File(param )); intent.setDataAndType(uri,"application/vnd.android.package-archive"); return intent; } //Android獲取一個用於打開VIDEO文件的intent public static Intent getVideoFileIntent( String param ) { Intent intent = new Intent("android.intent.action.VIEW"); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); intent.putExtra("oneshot", 0); intent.putExtra("configchange", 0); Uri uri = Uri.fromFile(new File(param )); intent.setDataAndType(uri, "video/*"); return intent; } //Android獲取一個用於打開AUDIO文件的intent public static Intent getAudioFileIntent( String param ){ Intent intent = new Intent("android.intent.action.VIEW"); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); intent.putExtra("oneshot", 0); intent.putExtra("configchange", 0); Uri uri = Uri.fromFile(new File(param )); intent.setDataAndType(uri, "audio/*"); return intent; } //Android獲取一個用於打開Html文件的intent public static Intent getHtmlFileIntent( String param ){ Uri uri = Uri.parse(param ).buildUpon().encodedAuthority("com.android.htmlfileprovider").scheme("content").encodedPath(param ).build(); Intent intent = new Intent("android.intent.action.VIEW"); intent.setDataAndType(uri, "text/html"); return intent; } //Android獲取一個用於打開圖片文件的intent public static Intent getImageFileIntent( String param ) { Intent intent = new Intent("android.intent.action.VIEW"); intent.addCategory("android.intent.category.DEFAULT"); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); Uri uri = Uri.fromFile(new File(param )); intent.setDataAndType(uri, "image/*"); return intent; } //Android獲取一個用於打開PPT文件的intent public static Intent getPptFileIntent( String param ){ Intent intent = new Intent("android.intent.action.VIEW"); intent.addCategory("android.intent.category.DEFAULT"); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); Uri uri = Uri.fromFile(new File(param )); intent.setDataAndType(uri, "application/vnd.ms-powerpoint"); return intent; } //Android獲取一個用於打開Excel文件的intent public static Intent getExcelFileIntent( String param ){ Intent intent = new Intent("android.intent.action.VIEW"); intent.addCategory("android.intent.category.DEFAULT"); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); Uri uri = Uri.fromFile(new File(param )); intent.setDataAndType(uri, "application/vnd.ms-excel"); return intent; } //Android獲取一個用於打開Word文件的intent public static Intent getWordFileIntent( String param ){ Intent intent = new Intent("android.intent.action.VIEW"); intent.addCategory("android.intent.category.DEFAULT"); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); Uri uri = Uri.fromFile(new File(param )); intent.setDataAndType(uri, "application/msword"); return intent; } //Android獲取一個用於打開CHM文件的intent public static Intent getChmFileIntent( String param ){ Intent intent = new Intent("android.intent.action.VIEW"); intent.addCategory("android.intent.category.DEFAULT"); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); Uri uri = Uri.fromFile(new File(param )); intent.setDataAndType(uri, "application/x-chm"); return intent; } //Android獲取一個用於打開文本文件的intent public static Intent getTextFileIntent( String param, boolean paramBoolean){ Intent intent = new Intent("android.intent.action.VIEW"); intent.addCategory("android.intent.category.DEFAULT"); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); if (paramBoolean){ Uri uri1 = Uri.parse(param ); intent.setDataAndType(uri1, "text/plain"); }else{ Uri uri2 = Uri.fromFile(new File(param )); intent.setDataAndType(uri2, "text/plain"); } return intent; } //Android獲取一個用於打開PDF文件的intent public static Intent getPdfFileIntent( String param ){ Intent intent = new Intent("android.intent.action.VIEW"); intent.addCategory("android.intent.category.DEFAULT"); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); Uri uri = Uri.fromFile(new File(param )); intent.setDataAndType(uri, "application/pdf"); return intent; } }
不要忘記在AndroidManifest.xml加權限哦!
<!-- SD卡權限 --> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
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