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   源码介绍

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package cn.itcast.lockscreen;

import android.app.Activity;
import android.app.KeyguardManager;
import android.app.admin.DevicePolicyManager;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.PowerManager;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;

/**
 * device admin : ��ȡ�豸�ij�������ԱȨ��
 * 
 * @author zehua
 * 
 */
public class LockscreenActivity extends Activity implements OnClickListener {
	private static final String LOCK_TAG = null;
	private Button bt_lock;
	private Button bt_wipe;
	private Button bt_close;
	private Button bt_uninstall;
	DevicePolicyManager policyManager;
	ComponentName componentName;
	private final int requestCode = 1;



	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		bt_lock = (Button) this.findViewById(R.id.button1);
		bt_wipe = (Button) this.findViewById(R.id.button2);
		bt_close = (Button) this.findViewById(R.id.button3);
		bt_uninstall = (Button) this.findViewById(R.id.button4);
		bt_lock.setOnClickListener(this);
		bt_wipe.setOnClickListener(this);
		bt_close.setOnClickListener(this);
		bt_uninstall.setOnClickListener(this);

		policyManager = (DevicePolicyManager) getSystemService(DEVICE_POLICY_SERVICE);

		componentName = new ComponentName(this, MyAdmin.class);

		if (!policyManager.isAdminActive(componentName)) {
			Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
			intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, componentName);
			startActivity(intent);
		}
	}

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.button1: // 显示出要输入密码才能进入
			policyManager.resetPassword("1234", 0);
			policyManager.lockNow();
			break;

		case R.id.button2: // 清除数据
			policyManager.wipeData(0);
			break;
		case R.id.button3: // 锁屏并关闭屏幕
			systemLock();
			break;
		case R.id.button4: // 锁屏并关闭屏幕
			UninstallActivity();
			break;
		}

	}
	/**
	 * 锁屏并关闭屏幕
	 */
	  private void systemLock()
	  {
	    if (this.policyManager.isAdminActive(this.componentName))
	    {
	      Window localWindow = getWindow();
	      WindowManager.LayoutParams localLayoutParams = localWindow.getAttributes();
	      localLayoutParams.screenBrightness = 0.05F;
	      localWindow.setAttributes(localLayoutParams);
	      this.policyManager.lockNow();
	    }
	    finish();
	  }
	  /**
	   * 停用设备管理器并卸载程序
	   */
	  private void UninstallActivity(){
		  this.policyManager.removeActiveAdmin(this.componentName);
		    startActivity(new Intent("android.intent.action.DELETE", Uri.parse("package:cn.itcast.lockscreen")));
		    finish();
	  }
	

}