Android中级篇之用JAVA代码执行shell命令

http://www.linuxidc.com/Linux/2011-12/48958.htm

在Android可能有的系统信息没有直接提供API接口来访问，为了获取系统信息时我们就要在用shell指令来获取信息，这时我们可以在代码中来执行命令 ，这里主要用到ProcessBuilder 这个类.

代码部分  ：

package com.yin.system_analysis;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity {
    private final static String[] ARGS = {"ls","-l"};
    private final static String TAG = "com.yin.system";
    Button mButton;
    TextView myTextView;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mButton = (Button) findViewById(R.id.myButton);
        myTextView = (TextView) findViewById(R.id.textView);

        mButton.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {

                myTextView.setText(getResult());
            }
        });
    }
    public String getResult(){
         ShellExecute cmdexe = new ShellExecute ( );
         String result="";
         try {
            result = cmdexe.execute(ARGS, "/");
        } catch (IOException e) {
            Log.e(TAG, "IOException");
            e.printStackTrace();
        }
        return result;
    }
    private class ShellExecute {
        /*
         * args[0] : shell 命令  如"ls" 或"ls -1";
         * args[1] : 命令执行路径  如"/" ;
         */
        public String execute ( String [] cmmand,String directory)
        throws IOException {
        String result = "" ;
        try {
        ProcessBuilder builder = new ProcessBuilder(cmmand);

        if ( directory != null )
        builder.directory ( new File ( directory ) ) ;
        builder.redirectErrorStream (true) ;
        Process process = builder.start ( ) ;

        //得到命令执行后的结果
        InputStream is = process.getInputStream ( ) ;
        byte[] buffer = new byte[1024] ;
        while ( is.read(buffer) != -1 ) {
        result = result + new String (buffer) ;
        }
        is.close ( ) ;
        } catch ( Exception e ) {
            e.printStackTrace ( ) ;
        }
        return result ;
        }
    }
}

布局文件很简单就不列出了