android存储文件

// 写入文件到内部存储
try (FileOutputStream fos = openFileOutput("myfile.txt", Context.MODE_PRIVATE)) {
    fos.write("Hello, World!".getBytes());
} catch (IOException e) {
    e.printStackTrace();
}

// 读取内部存储文件
try (FileInputStream fis = openFileInput("myfile.txt")) {
    int content;
    StringBuilder sb = new StringBuilder();
    while ((content = fis.read()) != -1) {
        sb.append((char) content);
    }
    Log.d("FileContent", sb.toString());
} catch (IOException e) {
    e.printStackTrace();
}

// 写入文件到外部存储
File file = new File(getExternalFilesDir(null), "myfile.txt");
try (FileOutputStream fos = new FileOutputStream(file)) {
    fos.write("Hello, World!".getBytes());
} catch (IOException e) {
    e.printStackTrace();
}

// 读取外部存储文件
try (FileInputStream fis = new FileInputStream(file)) {
    int content;
    StringBuilder sb = new StringBuilder();
    while ((content = fis.read()) != -1) {
        sb.append((char) content);
    }
    Log.d("FileContent", sb.toString());
} catch (IOException e) {
    e.printStackTrace();
}