android存储---文件存储

android存储—文件存储

存储路径

data/data//files/目录下 文件名在openFileOutput时定义,在真机上,这个文件是隐藏的

存储模式

主要模式有两种 Context.MODE_APPEND和Context.MODE_PRIVATE

Context.MODE_PRIVATE:同样文件名时会被覆盖

Context.MODE_PRIVATE:同样文件名是,会往后面追加内容

Context.MODE_WORLD_READABLE和Context.MODE_WORLD_WRITEABLE,这两个过时了,可能被其他应用访问

存值方法例子

private void save() { String data = "要存储的字符串"; FileOutputStream fos = null; BufferedWriter writer = null; try { fos = openFileOutput("data", Context.MODE_APPEND); writer = new BufferedWriter(new OutputStreamWriter(fos)); writer.write(data); } catch (IOException e) { e.printStackTrace(); } finally { try { if (writer != null) { writer.close(); } } catch (IOException e) { e.printStackTrace(); } } }

取值方法

private String load() { FileInputStream in = null; BufferedReader reader = null; StringBuilder content = new StringBuilder(); try { in = openFileInput("data"); reader = new BufferedReader(new InputStreamReader(in)); String line = ""; while ((line = reader.readLine()) != null) { content.append(line); } } catch (IOException e) { e.printStackTrace(); } finally { if (reader != null) { try { reader.close(); } catch (IOException e) { e.printStackTrace(); } } } return content.toString(); }