把apk放到/system/app文件夹下，作为系统项目，就可以保证项目有root的权http://限。

root权限的app可以申请很多一般用户无法申请的权限。

可以查看哪些权限是需要root才能申请的。

package com.example.netaccesstest;

import java.io.DataOutputStream;

import java.io.IOException;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

public class MainActivity extends Activity {

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

Button open = (Button) findViewById(R.id.open);

Button close = (Button) findViewById(R.id.close);

open.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

try {

CopyAppToSystem();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

});

close.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

RunAsRooter();

}

});

}

private void RunAsRooter()

{

try {

Process process = Runtime.getRuntime().exec("su");

process.waitFor();

} catch (IOException e) {

e.printStackTrace();

} catch (InterruptedException e) {

e.printStackTrace();

}

}

private void CopyAppToSystem() throws IOException

{

Process process = Runtime.getRuntime().exec("su");

DataOutputStream out = new DataOutputStream(process.getOutputStream());

out.writeBytes("mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system\n");

out.writeBytes("cat /sdcard/myApp.adk > /system/app/myApp.adk\n");

out.writeBytes("mount -o remount,ro -t yaffs2 /dev/block/mtdblock3 /system\n");

out.writeBytes("exit\n");

out.flush();

try {

process.waitFor();

} catch (InterruptedException e) {

e.printStackTrace();

}

}

}