http://blog.csdn.net/jingwen3699/article/details/8175937
要在android应用程序中使用root权限,那么运行程序的设备必须具有root权限
public static boolean runRootCommand(String command) {
Process process = null;
DataOutputStream os = null;
try {
process = Runtime.getRuntime().exec("su");
os = new DataOutputStream(process.getOutputStream());
os.writeBytes(command+"\n");
\"Do I have root?\" >/system/sd/temporary.txt\n");
os.writeBytes("exit\n");
os.flush();
process.waitFor();
} catch (Exception e) {
Log.d(TAG, "the device is not rooted, error message: " + e.getMessage());
return false;
} finally {
try {
if (os != null) {
os.close();
}
if(process != null) {
process.destroy();
}
} catch (Exception e) {
e.printStackTrace();
}
}
return true;
}
如果设备获取了root权限,那么程序执行su命令时,就会提示用户进行授权,如图:
写个小程序需要用到获取ROOT权限,在网上找了好久,发现这种方法可行,
前提时设备必须已经破解过!能执行su命令。
一、建一个方法:代码如下:
package cn.ycmoon.utility;
import java.io.DataOutputStream;
import android.app.Activity;
import android.util.Log;
public class SystemManager extends Activity
{
/**
* 应用程序运行命令获取 Root权限,设备必须已破解(获得ROOT权限)
* @param command 命令:String apkRoot="chmod 777 "+getPackageCodePath(); RootCommand(apkRoot);
* @return 应用程序是/否获取Root权限
*/
public static boolean RootCommand(String command)
{
Process process = null;
DataOutputStream os = null;
try
{
process = Runtime.getRuntime().exec("su");
os = new DataOutputStream(process.getOutputStream());
os.writeBytes(command + "\n");
os.writeBytes("exit\n");
os.flush();
process.waitFor();
} catch (Exception e)
{
Log.d("*** DEBUG ***", "ROOT REE" + e.getMessage());
return false;
} finally
{
try
{
if (os != null)
{
os.close();
}
process.destroy();
} catch (Exception e)
{
}
}
Log.d("*** DEBUG ***", "Root SUC ");
return true;
}
}
二、在应用程序的MainActivity方法中:
public class MainActivity extends Activity
{
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
String apkRoot="chmod 777 "+getPackageCodePath();
SystemManager.RootCommand(apkRoot);
}
这样,在应用程序运行的时候,会弹出消息对话框“应用程序已获取root权限”
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android应用需要调用shell命令的时候,网上找到的资料是:
String cmd = String.format("echo %s > %s\n", arg, mSwitchUsbFileTextEdit.getText().toString());
try {
Process exeEcho = Runtime.getRuntime().exec("su");
exeEcho.getOutputStream().write(cmd.getBytes());
exeEcho.getOutputStream().flush();
} catch (IOException e) {
showMessage("Excute exception: " + e.getMessage());
}
注意,之所以需要执行su命令,而不是直接执行echo命令,是因为那样会跑出IOException: Working Directory: null Environment: null。但是如果是在装有SuperRoot应用的机器上,su命令可能被拒绝,而且执行普通的命令应该不需要使用su命令才对。试验了一下,Process exeEcho = Runtime.getRuntime().exec("su");这一行改成Process exeEcho = Runtime.getRuntime().exec("sh");也可以执行。查了一下资料:
http://www.cnblogs.com/zhengwenwei/archive/2011/08/16/2141642.html
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