Question

我使用以下代码创建了一个data.txt：

String data = "etc etc etc etc。。" 
                   try {
                   FileOutputStream fOut;

                   fOut = openFileOutput("data.txt", MODE_WORLD_READABLE);

                   OutputStreamWriter fw = new OutputStreamWriter(fOut); 

                   fw.write(data);
                   fw.flush();
                   fw.close();

                } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();

但我如何知道它写入的位置？如何为data.txt定义路径？

我想用其他活动来阅读它，所以我需要知道如何从路径中读取..

Answer 1

你可以这样做......

     static final String FILE_LOG = "log.txt";

    String s = "Hello";
            File file;
            FileOutputStream fos = null;

            try
            {
                file = new File(getExternalFilesDir(null), FILE_LOG);
                fos = new FileOutputStream(file);
            }
            catch(FileNotFoundException e)
            {
                Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
                return;
            }

            try
            {
                fos.write(s.getBytes());
                fos.close();
            }
            catch(IOException e)
            {
                Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
                return;
            }

   String path = file.getAbsolutePath().toString();
   Toast.makeText(this, "File is saved to " + path, Toast.LENGTH_SHORT).show();
   Log.e("PATH", path);

希望这会对你有所帮助。

...谢谢

Answer 2

我认为这会奏效：

File root = Environment.getExternalStorageDirectory();
String data = "etc etc etc etc。。";
try{
    if (root.canWrite()){
        File txtfile = new File(root, "data.txt");
        FileWriter txtwriter = new FileWriter(txtfile, true);
        BufferedWriter out = new BufferedWriter(txtwriter);
        out.write(data);
        out.close();
    }
}
catch (IOException e){
    e.printStackTrace();
}

}

此代码将在您的外部存储根目录中创建一个data.txt文件。不要忘记将此权限添加到AndroidManifest.xml文件中：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

读取文件android

2 个答案: