Android中级篇之用JAVA代码执行shell命令

JAVA代码执行shell命令

2011-06-07 20:48:20

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

执行结果 如图 :