Runtime.getRunTime.exec(String command)的运用

Runtime.getRunTime.exec(String command)的使用
原文链接 http://blog.****.net/zmyde2010/archive/2011/01/08/6123987.aspx
Android: 通过Runtime.getRuntime().exec调用底层Linux下的程序或脚本收藏
Android Runtime使得直接调用底层Linux下的可执行程序或脚本成为可能

比如Linux下写个测试工具，直接编译后apk中通过Runtime来调用

或者写个脚本，apk中直接调用，省去中间层或者JNI

这个至少效率应该比较高吧



代码:

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public class test extends Activity {  
    TextView text;  
      
     
    @Override 
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
          
        text = (TextView) findViewById(R.id.text);  
          
        Button btn_ls = (Button) findViewById(R.id.btn_ls);  
        btn_ls.setOnClickListener(new OnClickListener() {  
            public void onClick(View v) {                 
                do_exec("ls /mnt/sdcard");  
            }             
        });  
        Button btn_cat = (Button) findViewById(R.id.btn_cat);  
        btn_cat.setOnClickListener(new OnClickListener() {  
            public void onClick(View v) {                 
                do_exec("cat /proc/version");  
            }             
        });          
        Button btn_rm = (Button) findViewById(R.id.btn_rm);  
        btn_rm.setOnClickListener(new OnClickListener() {  
            public void onClick(View v) {                 
                do_exec("rm /mnt/sdcard/1.jpg");  
            }             
        });      
        Button btn_sh = (Button) findViewById(R.id.btn_sh);  
        btn_sh.setOnClickListener(new OnClickListener() {  
            public void onClick(View v) {                 
                do_exec("/system/bin/sh /mnt/sdcard/test.sh 123");  
            }             
        });           
    }  
      
    String do_exec(String cmd) {  
        String s = "\n";  
        try {  
            Process p = Runtime.getRuntime().exec(cmd);  
            BufferedReader in = new BufferedReader(  
                                new InputStreamReader(p.getInputStream()));  
            String line = null;  
            while ((line = in.readLine()) != null) {  
                s += line + "\n";                 
            }  
        } catch (IOException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
        }  
        text.setText(s);  
        return cmd;       
    }  
} 
public class test extends Activity {
TextView text;

  
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        text = (TextView) findViewById(R.id.text);
       
        Button btn_ls = (Button) findViewById(R.id.btn_ls);
        btn_ls.setOnClickListener(new OnClickListener() {
   public void onClick(View v) {   
    do_exec("ls /mnt/sdcard");
   }        
        });
        Button btn_cat = (Button) findViewById(R.id.btn_cat);
        btn_cat.setOnClickListener(new OnClickListener() {
   public void onClick(View v) {   
    do_exec("cat /proc/version");
   }        
        });       
        Button btn_rm = (Button) findViewById(R.id.btn_rm);
        btn_rm.setOnClickListener(new OnClickListener() {
   public void onClick(View v) {   
    do_exec("rm /mnt/sdcard/1.jpg");
   }        
        });   
        Button btn_sh = (Button) findViewById(R.id.btn_sh);
        btn_sh.setOnClickListener(new OnClickListener() {
   public void onClick(View v) {   
    do_exec("/system/bin/sh /mnt/sdcard/test.sh 123");
   }        
        });        
    }
   
    String do_exec(String cmd) {
     String s = "\n";
     try {
   Process p = Runtime.getRuntime().exec(cmd);
   BufferedReader in = new BufferedReader(
        new InputStreamReader(p.getInputStream()));
   String line = null;
   while ((line = in.readLine()) != null) {
    s += line + "\n";   
   }
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
     text.setText(s);
  return cmd;    
    }
}

test.sh:

echo test.sh
echo $1

需要注意:

1. exec不等于console命令

2. exec的输入输出流需要自己处理

3. exec执行时阻塞、非阻塞，返回结果问题

4. 注意权限问题

有个文章讲的比较深入，贴出来研究:

http://blog.****.net/zmyde2010/archive/2011/01/12/6130895.aspx

http://kuangbaoxu.javaeye.com/blog/210291