Android自动关机代码

import java.io.DataOutputStream; 
import java.io.IOException; 
import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
   
public class AutomaticShutdownActivity extends Activity { 
   
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.main); 
        Button closeBtn = (Button) findViewById(R.id.main_btn_close); 
        closeBtn.setOnClickListener(new OnClickListener() { 
   
            @Override 
            public void onClick(View arg0) { 
                shutdown(); 
            } 
        }); 
    } 
   
    /**
     * 关机的方法，需要手机有root权限
     */ 
    private void shutdown() { 
        try { 
            Process process = Runtime.getRuntime().exec("su"); 
            DataOutputStream out = new DataOutputStream( 
                    process.getOutputStream()); 
            out.writeBytes("reboot -p\n"); 
            out.writeBytes("exit\n"); 
            out.flush(); 
        } catch (IOException e) { 
            e.printStackTrace(); 
        } 
    } 
}