Android自动关机代码

http://www.open-open.com/lib/view/open1409209890713.html

要实现自动关机的功能需要手机有root权限，如果手机有root权限，运行该程序时，会提示该应用正在申请获取root权限，选择运行即可实现关机。代码如下：

activity：

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();
        }
    }
}