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   源码介绍

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package com.example.key;


import android.app.Activity;
import android.app.admin.DevicePolicyManager;
import android.content.ComponentName;
import android.content.Intent;
import android.os.Bundle;
import android.view.Window;


public class MainActivity extends Activity {

	DevicePolicyManager policyManager;
	ComponentName componentName;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
        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);
		}
		policyManager.lockNow();		
		android.os.Process.killProcess(android.os.Process.myPid());//退出程序
    }


}