android开发笔记之mtk平台 手机恢复出厂设置数据不删除的方法

      手机开发时，有时候，需要一个数据，在手机恢复出厂设置时，不删除，保持原来的值，这个如何处理呢？

       如果你是在mtk平台下（mtk6572）,这有一个解决方案：

（1）mediatek/config/hongyu72_wet_jb3/init.project.rc

on fs
# for multi-logo (emmc)
chown system system /dev/logo
chown system system /dev/block/mmcblk0
chown system system /sys/class/BOOT/BOOT/boot/logo_mode
chmod 0644 /dev/logo
chmod 0664 /dev/block/mmcblk0
chmod 7777 /sys/class/BOOT/BOOT/boot/logo_mode


on post-fs-data

（2）数据读写api:

import java.io.BufferedReader;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;

static String SALE_SAT_FILE = "/sys/class/BOOT/BOOT/boot/logo_mode";

public boolean setSaleStatCompletedFlag() {        try {            BufferedReader in = new BufferedReader(new FileReader(SALE_SAT_FILE));            String line = null;            FileWriter fw = new FileWriter(SALE_SAT_FILE);            fw.write("yes", 0, "yes".length());            fw.flush();            // rewrite check            line = in.readLine();            if (line == null || (line != null && !line.equals("yes"))) {                fw.write("yes", 0, "yes".length());                fw.flush();            }            fw.close();            in.close();        } catch (Exception e) {e.printStackTrace();                }return true;}private static int getsalesat() {// TODO Auto-generated method stubtry {FileReader fr = new FileReader(SALE_SAT_FILE);BufferedReader br = new BufferedReader(fr);try {String line = br.readLine();if(line.equals("yes")){br.close();fr.close();return 1;}} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();try {br.close();fr.close();} catch (IOException e1) {// TODO Auto-generated catch blocke1.printStackTrace();return 0;}return 0;}} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();return 0;}return 0;}    public static boolean isSaleStatCompletedFlag() {if(getsalesat() == 1){Log.v("LIUJIANFANG", "isSaleStatCompletedFlag  yes");return true;}return false;}

(3)其实，这个方法主要是参考settings模块，

packages/apps/settings/src/com/android/settings/testingSettingsBroadcastReceiver.java

   void writeBootLogo(final Context context, String mode) {        try {            BufferedReader in = new BufferedReader(new FileReader(                    "sys/class/BOOT/BOOT/boot/logo_mode"));            String line = null;            FileWriter fw = new FileWriter("sys/class/BOOT/BOOT/boot/logo_mode");            fw.write(mode, 0, mode.length());            fw.flush();            // rewrite check            line = in.readLine();            if (line == null || (line != null && !line.equals(mode))) {                fw.write(mode, 0, mode.length());                fw.flush();            }            fw.close();            in.close();            (new Handler()).postDelayed(new Runnable() {                public void run() {                    PowerManager pm = (PowerManager) context                            .getSystemService("power");                    pm.reboot(null);                }            }, 1000);        } catch (Exception e) {            Log.e("FactoryMode", "e---------->>" + e.getMessage());        }    }