在我的APP中，我需要编写和读取文件（xml）。我编写了一个自定义对话框，我将文件保存在getExternalFilesDir或getExternalStoragePublicDirectory或内部存储器中，如android开发人员指南所述。正在写文件没有任何问题。但是当我尝试读取这些xml文件（它们存储在/ storage / 0 / emulated或/ data / data / myAPP / files中）时，使用android-file-dialog它表示文件夹存储和数据无法读取。像sys或system这样的另一个可以毫无问题地阅读，同时我被授权阅读写作我不能。
我正在使用android 4.4.4（rooted Kitkat）。我的应用程序具有所有必需的权限。这是我正在使用的代码。
public class SaveViewDialog extends DialogFragment {
private LayoutInflater inflater;
private View v;
private EditText name;
private List<RowData> lista;
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
inflater = getActivity().getLayoutInflater();
v = inflater.inflate(R.layout.filenamedialog_layout,null);
name=(EditText)v.findViewById(R.id.nombre);
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setView(v).setPositiveButton("Guardar", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if (!name.getText().toString().isEmpty()) {
String contenido = createContent();
boolean flag = true;
try {
File file = new File(getActivity().getExternalFilesDir(null), name.getText().toString() + ".vista.xml");
//File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS), name.getText().toString() + ".vista.xml");
//File file = new File("/extSdCard/",name.getText().toString() + ".vista.xml");
/*OutputStreamWriter fout = new OutputStreamWriter(
getActivity().openFileOutput(file.getCanonicalPath(), Context.MODE_WORLD_READABLE));*/
Log.e("Sitio del archivo",file.getAbsolutePath());
Toast.makeText(getActivity(),"File saved at: "+file.getAbsolutePath(),Toast.LENGTH_SHORT).show();
FileOutputStream fout = new FileOutputStream(file);
fout.write(contenido.getBytes());
fout.close();
} catch (Exception ex) {
ex.printStackTrace();
Log.e("Ficheros", "Error al escribir fichero a memoria interna");
flag = false;
Toast.makeText(getActivity(), "Hubo un error al guardar el archivo", Toast.LENGTH_LONG).show();
}
if (flag) {
Toast.makeText(getActivity(), "Archivo guardado con exito", Toast.LENGTH_LONG).show();
}
} else {
Toast.makeText(getActivity(), "Introduce un nombre para el archivo", Toast.LENGTH_LONG).show();
}
}
}).setNegativeButton("Cancelar", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
return builder.create();
}
@Override
public void setArguments(Bundle args) {
lista = new ArrayList<RowData>();
int tam = args.getInt("tam");
for(int i=0;i<tam;i++){
String tipo = args.getString("tipo"+i);
String variables = args.getString("variables"+i);
String ubicacion = args.getString("ubicacion"+i);
lista.add(new RowData(tipo,variables,ubicacion));
}
}
private String createContent(){
String contenido = "<lista>\n";
for (int i = 0; i < lista.size(); i++) {
contenido += "\t<elemento>\n";
contenido += "\t\t<tipo>" + lista.get(i).getTipo() + "</tipo>\n";
contenido += "\t\t<variables>" + lista.get(i).getVariables() + "</variables>\n";
contenido += "\t\t<ubicacion>" + lista.get(i).getUbicacion() + "</ubicacion>\n";
contenido += "\t</elemento>\n";
}
contenido += "</lista>\n";
return contenido;
}
用于阅读我正在使用链接中的那个：
public class FileDialog extends ListActivity {
/**
* Chave de um item da lista de paths.
*/
private static final String ITEM_KEY = "key";
/**
* Imagem de um item da lista de paths (diretorio ou arquivo).
*/
private static final String ITEM_IMAGE = "image";
/**
* Diretorio raiz.
*/
private static final String ROOT = "/";
/**
* Parametro de entrada da Activity: path inicial. Padrao: ROOT.
*/
public static final String START_PATH = "START_PATH";
/**
* Parametro de entrada da Activity: filtro de formatos de arquivos. Padrao:
* null.
*/
public static final String FORMAT_FILTER = "FORMAT_FILTER";
/**
* Parametro de saida da Activity: path escolhido. Padrao: null.
*/
public static final String RESULT_PATH = "RESULT_PATH";
/**
* Parametro de entrada da Activity: tipo de selecao: pode criar novos paths
* ou nao. Padrao: nao permite.
*
* @see {@link SelectionMode}
*/
public static final String SELECTION_MODE = "SELECTION_MODE";
/**
* Parametro de entrada da Activity: se e permitido escolher diretorios.
* Padrao: falso.
*/
public static final String CAN_SELECT_DIR = "CAN_SELECT_DIR";
private List<String> path = null;
private TextView myPath;
private EditText mFileName;
private ArrayList<HashMap<String, Object>> mList;
private Button selectButton;
private LinearLayout layoutSelect;
private LinearLayout layoutCreate;
private InputMethodManager inputManager;
private String parentPath;
private String currentPath = ROOT;
private int selectionMode = SelectionMode.MODE_CREATE;
private String[] formatFilter = null;
private boolean canSelectDir = false;
private File selectedFile;
private HashMap<String, Integer> lastPositions = new HashMap<String, Integer>();
/**
* Called when the activity is first created. Configura todos os parametros
* de entrada e das VIEWS..
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setResult(RESULT_CANCELED, getIntent());
setContentView(R.layout.file_dialog_main);
myPath = (TextView) findViewById(R.id.path);
mFileName = (EditText) findViewById(R.id.fdEditTextFile);
inputManager = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE);
selectButton = (Button) findViewById(R.id.fdButtonSelect);
selectButton.setEnabled(false);
selectButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (selectedFile != null) {
getIntent().putExtra(RESULT_PATH, selectedFile.getPath());
setResult(RESULT_OK, getIntent());
finish();
}
}
});
final Button newButton = (Button) findViewById(R.id.fdButtonNew);
newButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
setCreateVisible(v);
mFileName.setText("");
mFileName.requestFocus();
}
});
selectionMode = getIntent().getIntExtra(SELECTION_MODE, SelectionMode.MODE_CREATE);
formatFilter = getIntent().getStringArrayExtra(FORMAT_FILTER);
canSelectDir = getIntent().getBooleanExtra(CAN_SELECT_DIR, false);
if (selectionMode == SelectionMode.MODE_OPEN) {
newButton.setEnabled(false);
}
layoutSelect = (LinearLayout) findViewById(R.id.fdLinearLayoutSelect);
layoutCreate = (LinearLayout) findViewById(R.id.fdLinearLayoutCreate);
layoutCreate.setVisibility(View.GONE);
final Button cancelButton = (Button) findViewById(R.id.fdButtonCancel);
cancelButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
setSelectVisible(v);
}
});
final Button createButton = (Button) findViewById(R.id.fdButtonCreate);
createButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (mFileName.getText().length() > 0) {
getIntent().putExtra(RESULT_PATH, currentPath + "/" + mFileName.getText());
setResult(RESULT_OK, getIntent());
finish();
}
}
});
String startPath = getIntent().getStringExtra(START_PATH);
startPath = startPath != null ? startPath : ROOT;
if (canSelectDir) {
File file = new File(startPath);
selectedFile = file;
selectButton.setEnabled(true);
}
getDir(startPath);
}
private void getDir(String dirPath) {
boolean useAutoSelection = dirPath.length() < currentPath.length();
Integer position = lastPositions.get(parentPath);
getDirImpl(dirPath);
if (position != null && useAutoSelection) {
getListView().setSelection(position);
}
}
/**
* Monta a estrutura de arquivos e diretorios filhos do diretorio fornecido.
*
* @param dirPath
* Diretorio pai.
*/
private void getDirImpl(final String dirPath) {
currentPath = dirPath;
final List<String> item = new ArrayList<String>();
path = new ArrayList<String>();
mList = new ArrayList<HashMap<String, Object>>();
File f = new File(currentPath);
File[] files = f.listFiles();
if (files == null) {
currentPath = ROOT;
f = new File(currentPath);
files = f.listFiles();
}
myPath.setText(getText(R.string.location) + ": " + currentPath);
if (!currentPath.equals(ROOT)) {
item.add(ROOT);
addItem(ROOT, R.drawable.folder);
path.add(ROOT);
item.add("../");
addItem("../", R.drawable.folder);
path.add(f.getParent());
parentPath = f.getParent();
}
TreeMap<String, String> dirsMap = new TreeMap<String, String>();
TreeMap<String, String> dirsPathMap = new TreeMap<String, String>();
TreeMap<String, String> filesMap = new TreeMap<String, String>();
TreeMap<String, String> filesPathMap = new TreeMap<String, String>();
for (File file : files) {
if (file.isDirectory()) {
String dirName = file.getName();
dirsMap.put(dirName, dirName);
dirsPathMap.put(dirName, file.getPath());
} else {
final String fileName = file.getName();
final String fileNameLwr = fileName.toLowerCase();
// se ha um filtro de formatos, utiliza-o
if (formatFilter != null) {
boolean contains = false;
for (int i = 0; i < formatFilter.length; i++) {
final String formatLwr = formatFilter[i].toLowerCase();
if (fileNameLwr.endsWith(formatLwr)) {
contains = true;
break;
}
}
if (contains) {
filesMap.put(fileName, fileName);
filesPathMap.put(fileName, file.getPath());
}
// senao, adiciona todos os arquivos
} else {
filesMap.put(fileName, fileName);
filesPathMap.put(fileName, file.getPath());
}
}
}
item.addAll(dirsMap.tailMap("").values());
item.addAll(filesMap.tailMap("").values());
path.addAll(dirsPathMap.tailMap("").values());
path.addAll(filesPathMap.tailMap("").values());
SimpleAdapter fileList = new SimpleAdapter(this, mList, R.layout.file_dialog_row, new String[] {
ITEM_KEY, ITEM_IMAGE }, new int[] { R.id.fdrowtext, R.id.fdrowimage });
for (String dir : dirsMap.tailMap("").values()) {
addItem(dir, R.drawable.folder);
}
for (String file : filesMap.tailMap("").values()) {
addItem(file, R.drawable.file);
}
fileList.notifyDataSetChanged();
setListAdapter(fileList);
}
private void addItem(String fileName, int imageId) {
HashMap<String, Object> item = new HashMap<String, Object>();
item.put(ITEM_KEY, fileName);
item.put(ITEM_IMAGE, imageId);
mList.add(item);
}
/**
* Quando clica no item da lista, deve-se: 1) Se for diretorio, abre seus
* arquivos filhos; 2) Se puder escolher diretorio, define-o como sendo o
* path escolhido. 3) Se for arquivo, define-o como path escolhido. 4) Ativa
* botao de selecao.
*/
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
File file = new File(path.get(position));
setSelectVisible(v);
if (file.isDirectory()) {
selectButton.setEnabled(false);
if (file.canRead()) {
lastPositions.put(currentPath, position);
getDir(path.get(position));
if (canSelectDir) {
selectedFile = file;
v.setSelected(true);
selectButton.setEnabled(true);
}
} else {
new AlertDialog.Builder(this).setIcon(R.drawable.icon)
.setTitle("[" + file.getName() + "] " + getText(R.string.cant_read_folder))
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
}).show();
}
} else {
selectedFile = file;
v.setSelected(true);
selectButton.setEnabled(true);
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK)) {
selectButton.setEnabled(false);
if (layoutCreate.getVisibility() == View.VISIBLE) {
layoutCreate.setVisibility(View.GONE);
layoutSelect.setVisibility(View.VISIBLE);
} else {
if (!currentPath.equals(ROOT)) {
getDir(parentPath);
} else {
return super.onKeyDown(keyCode, event);
}
}
return true;
} else {
return super.onKeyDown(keyCode, event);
}
}
/**
* Define se o botao de CREATE e visivel.
*
* @param v
*/
private void setCreateVisible(View v) {
layoutCreate.setVisibility(View.VISIBLE);
layoutSelect.setVisibility(View.GONE);
inputManager.hideSoftInputFromWindow(v.getWindowToken(), 0);
selectButton.setEnabled(false);
}
/**
* Define se o botao de SELECT e visivel.
*
* @param v
*/
private void setSelectVisible(View v) {
layoutCreate.setVisibility(View.GONE);
layoutSelect.setVisibility(View.VISIBLE);
inputManager.hideSoftInputFromWindow(v.getWindowToken(), 0);
selectButton.setEnabled(false);
}
比你所有人的答案。
答案 0 :(得分：0)
可能你必须在你的android manifest.xml中添加权限：
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />