安卓第一行代码之数据存储

文件存储的基本思路：
写入：
String data = "this is the data";
FileOutputStream out =null;
BufferedWriter writer = null;
try
{
    out = openFileOutput("content_path",MODE_PRIVATE/MODE_APPEND);

    writer = new BufferedWriter(new OutputStreamWriter（out）);

    writer.write(data);

}
catch(IOException e)
{
    e.printStackTrace();

}
finally
{
    try
        {
            if(writer!=null)

            {
                writer.close();

            }

            catch(IOException e)

            {
                e.printStackTrace();

            }

        }

}
读取：
FileInputStream in =null;
BufferedReader reader =null;
StringBuilder builder = new StringBuilder();
try
{
    in = openFileInput("content_path");

    reader = new BufferedReader(new InputStreamReader(in));

    String line="";
    while(line=reader.readLine()!=null)

    {
        builder.append(line);

    }

}

catch(IOException e)
{
    e.printStackTrace();

}
finally
{
    try
        {
            if(reader!=null)

            {
                reader.close();

            }

        }
            catch(IOException e)

            {
                e.printStackTrace();

            }
}