如何使用输入流读取器从内部存储器Android加载文件

Question

我的应用程序要求将文本(用户选择(保存到内部存储器中，然后我想要一个喜欢的功能，用户单击按钮，最喜欢的活动开始加载保存在内存中的文件(内部(。 在我的程序中有多个文本，我使用随机生成器将文件保存为"fav1"fav2"等，其中整数部分是随机生成的。 问题是现在我不知道如何提供我的文件名，以便检索文件并以文本视图显示。

public void load(String name){

    try {

BufferedReader

inputReader = new BufferedReader(new InputStreamReader(openFileInput(filename(((;

        String inputString;
        StringBuffer stringBuffer = new StringBuffer();                
        while ((inputString = inputReader.readLine()) != null) {
            stringBuffer.append(inputString + "n");
        }
        show.setText(stringBuffer.toString());
        } catch (IOException e) {
        e.printStackTrace();
        }

那么你如何建议我检索文件，它让任何人帮助都令人沮丧。

Answer 1

您可以通过以下代码轻松完成;正如您所说，它从内部存储中的文件读取。

private String readFromFile(String fname) {
    String ret = "";
    try {
        InputStream inputStream = openFileInput(fname+".txt");
        if ( inputStream != null ) {
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            String receiveString = "";
            StringBuilder stringBuilder = new StringBuilder();
            while ( (receiveString = bufferedReader.readLine()) != null ) {
                stringBuilder.append(receiveString);
            }
            show.setText(stringBuilder.toString());                
            inputStream.close();
        }
    }

编辑从包含路径分隔符的路径读取

File myFile = new File(fname+".txt"); // path contains full path to the file including file name
            FileInputStream fIn = new FileInputStream(myFile);
            BufferedReader myReader = new BufferedReader(
                    new InputStreamReader(fIn));
            String receiveString = "";
            StringBuilder stringBuilder = new StringBuilder();
            while ((receiveString = myReader.readLine()) != null) {
                stringBuilder.append(receiveString);
            }
            show.setText(stringBuilder.toString());    
            myReader.close();

编辑 2

列出特定目录中的文件，并按名称选择所需的文件。

File directory = new File(Environment.getExternalStorageDirectory()+"/sample");
 // check the existance of the parent directory
 if (directory.exists()) { 
 // get the list of files from the directory and keep it in an array of type File.
                    File[] fileList = directory.listFiles(); 
                for (File file : fileList) {
  //compares with filename: you can change this to your required file!
                        if (file.getName().equals("sam2.txt")) { 
  // method to read and show the text in text view
                            loadFile(file); 

                        }
                    }

最后是 loadFile(( 方法的定义：

private void loadFile(File file) {
                // TODO Auto-generated method stub
                   FileInputStream fIn;
                    try {
                        fIn = new FileInputStream(file);
                        BufferedReader myReader = new BufferedReader(
                                new InputStreamReader(fIn));
                        String receiveString = "";
                        StringBuilder stringBuilder = new StringBuilder();
                        while ((receiveString = myReader.readLine()) != null) {
                            stringBuilder.append(receiveString);
                        }
                        show.setText(stringBuilder.toString());    
                        myReader.close();
                    } catch (FileNotFoundException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } catch (Exception e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }