Android 设备管理员--我是老大^_^

　　Android 2.2 SDK提供了一个可管理和操作设备的API叫DevicePolicyManager，使用这个API你可以接管手机的应用权限，对手机做出很多大胆的操作，比如锁屏，恢复出厂设置（这么和谐的东西要是在中国是不大可能提供给你的），还有设置密码、强制清除密码，修改密码、设置屏幕灯光渐暗时间间隔等操作。这个API可谓是直接可以将你做的应用程序变成系统的老大哥了。虽说是这样，但应用程序可做老大只是对于你本身应用程序有效，别人也可以做类似的应用程序，这个与别人的权限是不起冲突的。

　　好了，废话不说，上界面：

具体的编写代码的流程：

1.因为这个API是用的2.2提供的API，所以必须将sdkVersion设置为8，像这样<uses-sdk android:minSdkVersion="8" />，这是必须的。

2.注册一个广播服务类，用以监听权限的变化：

 

<receiver android:name=".deviceAdminReceiver" android:label="@string/app_name"
            android:description="@string/description" android:permission="android.permission.BIND_DEVICE_ADMIN">

            <meta-data android:name="android.app.device_admin"
                android:resource="@xml/device_admin" />

            <intent-filter>
                <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
            </intent-filter>

        </receiver>

 

android:permission 表示此功能需要的权限，android:name="android.app.action.DEVICE_ADMIN_ENABLED" 表示此动作的跳转界面

<meta-data android:name="android.app.device_admin"
                android:resource="@xml/device_admin" />
表示这个应用可以管理的权限清单，xml清单如下：

 

<?xml version="1.0" encoding="utf-8"?>
<device-admin xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-policies>
        <limit-password />
        <watch-login />
        <reset-password />
        <force-lock />
        <wipe-data />
    </uses-policies>
</device-admin>

 

 

广播服务类的JAVA代码，重写一些必要的实现函数：

 

package com.terry.device;

import android.app.admin.DeviceAdminReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.widget.Toast;

public class deviceAdminReceiver extends DeviceAdminReceiver {

    /**
     * 获取设备存储的数值
     * 
     * @param context
     * @return
     */
    public static SharedPreferences getDevicePreference(Context context) {
        return context.getSharedPreferences(
                DeviceAdminReceiver.class.getName(), 0);
    }

    // 密码的特点
    public static String PREF_PASSWORD_QUALITY = "password_quality";
    // 密码的长度
    public static String PREF_PASSWORD_LENGTH = "password_length";

    public static String PREF_MAX_FAILED_PW = "max_failed_pw";

    void showToast(Context context, CharSequence text) {
        Toast.makeText(context, text, Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onEnabled(Context context, Intent intent) {
        // TODO Auto-generated method stub
        showToast(context, "设备管理：可用");
    }

    @Override
    public void onDisabled(Context context, Intent intent) {
        // TODO Auto-generated method stub
        showToast(context, "设备管理：不可用");
    }

    @Override
    public CharSequence onDisableRequested(Context context, Intent intent) {
        // TODO Auto-generated method stub
        return "这是一个可选的消息，警告有关禁止用户的请求";
    }

    @Override
    public void onPasswordChanged(Context context, Intent intent) {
        // TODO Auto-generated method stub
        showToast(context, "设备管理：密码己经改变");
    }

    @Override
    public void onPasswordFailed(Context context, Intent intent) {
        // TODO Auto-generated method stub
        showToast(context, "设备管理：改变密码失败");
    }

    @Override
    public void onPasswordSucceeded(Context context, Intent intent) {
        // TODO Auto-generated method stub
        showToast(context, "设备管理：改变密码成功");
    }

}

 

 

DeviceAdminReceiver是扩展于BroadcastReceiver。

 

下面先来看看操作效果，点击启用管理：

数据显示不完全 ，往下拉将看到：

中间有一句话叫做：“设备管理可以对系统的一些安全进行设置”，这句话来源于上面的广播receiver中的description:android:description="@string/description"，点击激活会触发广播类响应上面广播类弹出Toast。启用管理代码：

 

/**
     * 设备管理可用的点击事件
     * 
     * @author terry
     * 
     */
    class enableAdminClickEvent implements OnClickListener {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Intent intent = new Intent(
                    DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
            intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN,
                    mDeviceComponentName);
            intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,
                    "这里可以输入一些额外的说明,比如提示用户什么的");
            startActivityForResult(intent, RESULT_ENABLE);
        }

    }

 

 

 

锁屏操作，由于是模拟器不能做到真正错屏，只能停到初始模拟器进来需要解锁的状态，屏幕不会变暗。锁屏代码：

 

/**
     * 锁屏
     * 
     * @author terry
     * 
     */
    class force_lock implements OnClickListener {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            if (mAM.isUserAMonkey()) {
                AlertDialog.Builder builder = new AlertDialog.Builder(
                        deviceActivity.this);
                builder.setMessage("你不能对此屏幕进行操作，因为你不是管理员");
                builder.setPositiveButton("I admit defeat", null);
                builder.show();
                return;
            }
            boolean active = mDPM.isAdminActive(mDeviceComponentName);
            if (active) {
                mDPM.lockNow();
            }
        }
    }

 

 

屏幕在设置相应时间后灯光变暗效果：

 

/**
     * 屏幕自动变暗
     * 
     * @author terry
     * 
     */
    class timeoutClickEvent implements OnClickListener {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            if (mAM.isUserAMonkey()) {
                AlertDialog.Builder builder = new AlertDialog.Builder(
                        deviceActivity.this);
                builder.setMessage("你不能对我的屏幕进行操作，因为你不是管理员");
                builder.setPositiveButton("I admit defeat", null);
                builder.show();
                return;
            }
            boolean active = mDPM.isAdminActive(mDeviceComponentName);
            if (active) {
                long timeout = 1000L * Long.parseLong(et.getText().toString());
                mDPM.setMaximumTimeToLock(mDeviceComponentName, timeout);
            }
        }
    }

 

 

由于是模拟器，恢复出厂设置清除数据后，将无法重新开机，必须重新启动机子，在真机上是没有问题的，测试的时候必须小心，以免将你的数据清除掉。恢复出厂设置代码：

 

/**
     * 恢复出厂设置
     * 
     * @author terry
     * 
     */
    class resetClickEvent implements OnClickListener {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            if (mAM.isUserAMonkey()) {
                // Don't trust monkeys to do the right thing!
                AlertDialog.Builder builder = new AlertDialog.Builder(
                        deviceActivity.this);
                builder
                        .setMessage("You can't wipe my data because you are a monkey!");
                builder.setPositiveButton("I admit defeat", null);
                builder.show();
                return;
            }

            AlertDialog.Builder builder = new Builder(deviceActivity.this);
            builder.setMessage("将重置数据，你确定此操作吗？");
            builder.setPositiveButton(android.R.string.ok,
                    new DialogInterface.OnClickListener() {

                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            // TODO Auto-generated method stub
                            AlertDialog.Builder aler = new AlertDialog.Builder(
                                    deviceActivity.this);
                            aler.setMessage("删除数据后，系统将会重新启动.确定吗？");
                            aler.setPositiveButton(android.R.string.ok,
                                    new DialogInterface.OnClickListener() {

                                        @Override
                                        public void onClick(
                                                DialogInterface dialog,
                                                int which) {
                                            // TODO Auto-generated method stub
                                            boolean active = mDPM
                                                    .isAdminActive(mDeviceComponentName);
                                            if (active) {
                                                mDPM.wipeData(0);
                                            }
                                        }
                                    });
                            aler
                                    .setNeutralButton(android.R.string.cancel,
                                            null);
                            aler.show();
                        }
                    });
            builder.setNeutralButton(android.R.string.cancel, null);
            builder.show();
        }
    }

 

API的提供简化了很多烦琐的操作，就上面那些代码就可以实现了，完整代码如下：

 

package com.terry.device;

import android.app.Activity;
import android.app.ActivityManager;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.app.admin.DevicePolicyManager;
import android.content.ComponentName;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class deviceActivity extends Activity {
    static final int RESULT_ENABLE = 1;
    DevicePolicyManager mDPM;
    ActivityManager mAM;
    ComponentName mDeviceComponentName;
    Button enableAdmin, disableAdmin, force_lock, btn_time_out, reset;
    EditText et;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mDPM = (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);
        mAM = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
        mDeviceComponentName = new ComponentName(deviceActivity.this,
                deviceAdminReceiver.class);
        setContentView(R.layout.main);

        findView();

        init();

    }

    void findView() {
        enableAdmin = (Button) findViewById(R.id.enable_admin);
        disableAdmin = (Button) findViewById(R.id.disable_admin);
        force_lock = (Button) findViewById(R.id.force_lock);
        btn_time_out = (Button) findViewById(R.id.time_out);
        et = (EditText) findViewById(R.id.et_time_out);
        reset = (Button) findViewById(R.id.reset);
    }

    void init() {
        enableAdmin.setOnClickListener(new enableAdminClickEvent());
        disableAdmin.setOnClickListener(new disableAdminClickEvent());
        force_lock.setOnClickListener(new force_lock());
        btn_time_out.setOnClickListener(new timeoutClickEvent());
        reset.setOnClickListener(new resetClickEvent());
    }

    void updateButtonState() {
        boolean active = mDPM.isAdminActive(mDeviceComponentName);
        if (active) {
            enableAdmin.setEnabled(false);
            disableAdmin.setEnabled(true);
            force_lock.setEnabled(true);
            btn_time_out.setEnabled(true);
            reset.setEnabled(true);
        } else {
            enableAdmin.setEnabled(true);
            disableAdmin.setEnabled(false);
            force_lock.setEnabled(false);
            btn_time_out.setEnabled(false);
            reset.setEnabled(false);
        }
    }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        updateButtonState();
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        switch (requestCode) {
        case RESULT_ENABLE:
            if (resultCode == Activity.RESULT_OK) {
                Log.v("DeviceEnable", "deviceAdmin:enable");
            } else {
                Log.v("DeviceEnable", "deviceAdmin:disable");
            }
            break;

        }

        super.onActivityResult(requestCode, resultCode, data);
    }

    /**
     * 设备管理可用的点击事件
     * 
     * @author terry
     * 
     */
    class enableAdminClickEvent implements OnClickListener {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Intent intent = new Intent(
                    DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
            intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN,
                    mDeviceComponentName);
            intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,
                    "这里可以输入一些额外的说明,比如提示用户什么的");
            startActivityForResult(intent, RESULT_ENABLE);
        }

    }

    /**
     * 设备管理不可用的点击事件
     * 
     * @author terry
     * 
     */
    class disableAdminClickEvent implements OnClickListener {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            mDPM.removeActiveAdmin(mDeviceComponentName);
            updateButtonState();
        }

    }

    /**
     * 锁屏
     * 
     * @author terry
     * 
     */
    class force_lock implements OnClickListener {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            if (mAM.isUserAMonkey()) {
                AlertDialog.Builder builder = new AlertDialog.Builder(
                        deviceActivity.this);
                builder.setMessage("你不能对此屏幕进行操作，因为你不是管理员");
                builder.setPositiveButton("I admit defeat", null);
                builder.show();
                return;
            }
            boolean active = mDPM.isAdminActive(mDeviceComponentName);
            if (active) {
                mDPM.lockNow();
            }
        }
    }

    /**
     * 屏幕自动变暗
     * 
     * @author terry
     * 
     */
    class timeoutClickEvent implements OnClickListener {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            if (mAM.isUserAMonkey()) {
                AlertDialog.Builder builder = new AlertDialog.Builder(
                        deviceActivity.this);
                builder.setMessage("你不能对我的屏幕进行操作，因为你不是管理员");
                builder.setPositiveButton("I admit defeat", null);
                builder.show();
                return;
            }
            boolean active = mDPM.isAdminActive(mDeviceComponentName);
            if (active) {
                long timeout = 1000L * Long.parseLong(et.getText().toString());
                mDPM.setMaximumTimeToLock(mDeviceComponentName, timeout);
            }
        }
    }

    /**
     * 恢复出厂设置
     * 
     * @author terry
     * 
     */
    class resetClickEvent implements OnClickListener {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            if (mAM.isUserAMonkey()) {
                // Don't trust monkeys to do the right thing!
                AlertDialog.Builder builder = new AlertDialog.Builder(
                        deviceActivity.this);
                builder
                        .setMessage("You can't wipe my data because you are a monkey!");
                builder.setPositiveButton("I admit defeat", null);
                builder.show();
                return;
            }

            AlertDialog.Builder builder = new Builder(deviceActivity.this);
            builder.setMessage("将重置数据，你确定此操作吗？");
            builder.setPositiveButton(android.R.string.ok,
                    new DialogInterface.OnClickListener() {

                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            // TODO Auto-generated method stub
                            AlertDialog.Builder aler = new AlertDialog.Builder(
                                    deviceActivity.this);
                            aler.setMessage("删除数据后，系统将会重新启动.确定吗？");
                            aler.setPositiveButton(android.R.string.ok,
                                    new DialogInterface.OnClickListener() {

                                        @Override
                                        public void onClick(
                                                DialogInterface dialog,
                                                int which) {
                                            // TODO Auto-generated method stub
                                            boolean active = mDPM
                                                    .isAdminActive(mDeviceComponentName);
                                            if (active) {
                                                mDPM.wipeData(0);
                                            }
                                        }
                                    });
                            aler
                                    .setNeutralButton(android.R.string.cancel,
                                            null);
                            aler.show();
                        }
                    });
            builder.setNeutralButton(android.R.string.cancel, null);
            builder.show();
        }
    }

}

 

 

 

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