2.在device.c中提权限，
3.每次都在java层去提权，cmd为提权命令
public void exeShell(String cmd){
try{
Process p = Runtime.getRuntime().exec(cmd);
BufferedReader in = new BufferedReader(
new InputStreamReader(
p.getInputStream()));
String line = null;
while ((line = in.readLine()) != null) {
Log.i("exeShell",line);
}
}
catch(Throwable t)
{
t.printStackTrace();
}
}
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