我花了一天的时间研究，修改第三方的国笔输入法的手写默认显示方式，原先是全屏模式，我要改为非全屏模式。

首先把国笔输入法生成的sharedPreferences文件拷贝出来，查看显示全屏与非全屏的关键字。

但是2.3系统使用

try {
otherAppsContext=createPackageContext("com.guobi.gbime", CONTEXT_IGNORE_SECURITY );
} catch (NameNotFoundException e) {
// TODO Auto-generated catch block
Log.i("guobi", e.getMessage());
}

SharedPreferences sharedPreferences = otherAppsContext.getSharedPreferences("com.guobi.gbime_preferences", Context.MODE_WORLD_READABLE);

String name2 = sharedPreferences.getString("HandwriteFrameType", "");是可以获取到数据，而4.0就不行，打印的是空。

最终发现主要是权限问题。

国笔输入法生成的sharedPreferences文件是rw- rw- ---,，所以我们必须改变它的权限进行操作,其实目录也要改权限，都改为777。我在launcher的oncreate()方法中加入以下代码

//修改国笔输入法的显示模式，把全屏改为非全屏模式

xmlFile = new File("/data/data/com.guobi.gbime/shared_prefs/com.guobi.gbime_preferences.xml");
if(xmlFile.exists())
{
try {
Runtime.getRuntime().exec(new String[]{"su","-c","chmod 777 /data/data/com.guobi.gbime/shared_prefs/com.guobi.gbime_preferences.xml"});
Log.i("guobi", "chmod 777");
Runtime.getRuntime().exec(new String[]{"su","-c","rm /data/data/com.guobi.gbime/shared_prefs/com.guobi.gbime_preferences.xml"});
Log.i("guobi", " rm");
Runtime.getRuntime().exec(new String[]{"su","-c","touch /data/data/com.guobi.gbime/shared_prefs/com.guobi.gbime_preferences.xml"});
Log.i("guobi", " touch");
Runtime.getRuntime().exec(new String[]{"su","-c","chmod 777 /data/data/com.guobi.gbime/shared_prefs/com.guobi.gbime_preferences.xml"});
Log.i("guobi", " chomd");

} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else
{
if(!xmlFile.getParentFile().exists())
{
try {
Runtime.getRuntime().exec(new String[]{"su","-c","mkdir /data/data/com.guobi.gbime/shared_prefs"});
Log.i("guobi", "mkdir");
Runtime.getRuntime().exec(new String[]{"su","-c","chmod 777 /data/data/com.guobi.gbime/shared_prefs"});
Log.i("guobi", " chomd");

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

}

try {
Runtime.getRuntime().exec(new String[]{"su","-c","touch /data/data/com.guobi.gbime/shared_prefs/com.guobi.gbime_preferences.xml"});
Log.i("guobi", "touch");
Log.i("guobi", "chmod 777");
Runtime.getRuntime().exec(new String[]{"su","-c","chmod 777 /data/data/com.guobi.gbime/shared_prefs/com.guobi.gbime_preferences.xml"});
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}