Android 2.2 SDK提供了一個可管理和操作設備的API叫DevicePolicyManager,使用這個API你可以接管手機的應用權限,對手機做出很多大膽的操作,比如鎖屏,恢復出廠設置(這麼和諧的東西要是在中國是不大可能提供給你的),還有設置密碼、強制清除密碼,修改密碼、設置屏幕燈光漸暗時間間隔等操作。這個API可謂是直接可以將你做的應用程序變成系統的老大哥了。雖說是這樣,但應用程序可做老大只是對於你本身應用程序有效,別人也可以做類似的應用程序,這個與別人的權限是不起沖突的。
好了,廢話不說,上界面:
具體的編寫代碼的流程:
1.因為這個API是用的2.2提供的API,所以必須將sdkVersion設置為8,像這樣<uses-sdk android:minSdkVersion="8" />,這是必須的。
2.注冊一個廣播服務類,用以監聽權限的變化:
<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 表示此功能需要的權限,android:name="android.app.action.DEVICE_ADMIN_ENABLED" 表示此動作的跳轉界面
<meta-data android:name="android.app.device_admin"
android:resource="@xml/device_admin" />
表示這個應用可以管理的權限清單,xml清單如下:
<?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>
廣播服務類的JAVA代碼,重寫一些必要的實現函數:
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 {
/**
* 獲取設備存儲的數值
*
* @param context
* @return
*/
public static SharedPreferences getDevicePreference(Context context) {
return context.getSharedPreferences(
DeviceAdminReceiver.class.getName(), 0);
}
// 密碼的特點
public static String PREF_PASSWORD_QUALITY = "password_quality";
// 密碼的長度
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, "設備管理:可用");
}
@Override
public void onDisabled(Context context, Intent intent) {
// TODO Auto-generated method stub
showToast(context, "設備管理:不可用");
}
@Override
public CharSequence onDisableRequested(Context context, Intent intent) {
// TODO Auto-generated method stub
return "這是一個可選的消息,警告有關禁止用戶的請求";
}
@Override
public void onPasswordChanged(Context context, Intent intent) {
// TODO Auto-generated method stub
showToast(context, "設備管理:密碼己經改變");
}
@Override
public void onPasswordFailed(Context context, Intent intent) {
// TODO Auto-generated method stub
showToast(context, "設備管理:改變密碼失敗");
}
@Override
public void onPasswordSucceeded(Context context, Intent intent) {
// TODO Auto-generated method stub
showToast(context, "設備管理:改變密碼成功");
}
}
DeviceAdminReceiver是擴展於BroadcastReceiver。
下面先來看看操作效果,點擊啟用管理:
數據顯示不完全 ,往下拉將看到:
中間有一句話叫做:“設備管理可以對系統的一些安全進行設置”,這句話來源於上面的廣播receiver中的description:android:description="@string/description",點擊激活會觸發廣播類響應上面廣播類彈出Toast。啟用管理代碼:
/**
* 設備管理可用的點擊事件
*
* @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,
"這裡可以輸入一些額外的說明,比如提示用戶什麼的");
startActivityForResult(intent, RESULT_ENABLE);
}
}
鎖屏操作,由於是模擬器不能做到真正錯屏,只能停到初始模擬器進來需要解鎖的狀態,屏幕不會變暗。鎖屏代碼:
/**
* 鎖屏
*
* @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("你不能對此屏幕進行操作,因為你不是管理員");
builder.setPositiveButton("I admit defeat", null);
builder.show();
return;
}
boolean active = mDPM.isAdminActive(mDeviceComponentName);
if (active) {
mDPM.lockNow();
}
}
}
屏幕在設置相應時間後燈光變暗效果:
/**
* 屏幕自動變暗
*
* @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("你不能對我的屏幕進行操作,因為你不是管理員");
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);
}
}
}
由於是模擬器,恢復出廠設置清除數據後,將無法重新開機,必須重新啟動機子,在真機上是沒有問題的,測試的時候必須小心,以免將你的數據清除掉。恢復出廠設置代碼:
/**
* 恢復出廠設置
*
* @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("將重置數據,你確定此操作嗎?");
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("刪除數據後,系統將會重新啟動.確定嗎?");
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的提供簡化了很多煩瑣的操作,就上面那些代碼就可以實現了,完整代碼如下:
DeviceActivity
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);
}
/**
* 設備管理可用的點擊事件
*
* @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,
"這裡可以輸入一些額外的說明,比如提示用戶什麼的");
startActivityForResult(intent, RESULT_ENABLE);
}
}
/**
* 設備管理不可用的點擊事件
*
* @author terry
*
*/
class disableAdminClickEvent implements OnClickListener {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
mDPM.removeActiveAdmin(mDeviceComponentName);
updateButtonState();
}
}
/**
* 鎖屏
*
* @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("你不能對此屏幕進行操作,因為你不是管理員");
builder.setPositiveButton("I admit defeat", null);
builder.show();
return;
}
boolean active = mDPM.isAdminActive(mDeviceComponentName);
if (active) {
mDPM.lockNow();
}
}
}
/**
* 屏幕自動變暗
*
* @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("你不能對我的屏幕進行操作,因為你不是管理員");
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);
}
}
}
/**
* 恢復出廠設置
*
* @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("將重置數據,你確定此操作嗎?");
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("刪除數據後,系統將會重新啟動.確定嗎?");
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();
}
}
}