Android螢幕鎖定詳解完整版(二)

最近有朋友問螢幕鎖定的問題,小馬自己也在學習,網上找了下也沒太詳細的例子,看的資料書上也沒有有關螢幕鎖定程式的介紹,下個小決心,自己照着官方文檔學習下,現在做好了,小馬廢話不多說,先發下截圖,看下效果,需要注意的地方小馬會加注釋,有問題的朋友可以直接留言,我們共同學習交流,共同提高進步!直接看效果圖:

一:未設定密碼時進入系統設定的效果圖如下:

二:運作DEMO,進入應用時:

三:設定密碼方式預覽:

四:隻設定密碼保護時的效果圖

五:密碼解密效果圖

六:設定九宮格加密時的效果圖

七:九宮格解密時的效果圖

八:解密成功後,進入我們手機系統的圖

下面來簡單的看下源碼吧,此處講下,這個小DEMO也是小馬臨時學習下的,有講的不明白的地方請朋友直接批評指出,有錯肯定改的,吼吼..看代碼:

主要制類:

package com.xiaoma.policymanager.demo;

import android.app.Activity;

import android.app.admin.DevicePolicyManager;

import android.content.Intent;

import android.content.SharedPreferences;

import android.os.Bundle;

import android.view.View;

import android.widget.AdapterView;

import android.widget.ArrayAdapter;

import android.widget.Button;

import android.widget.EditText;

import android.widget.LinearLayout;

import android.widget.Spinner;

import android.widget.TextView;

/**

* @Title: PolicySetupActivity.java

* @Package com.xiaoma.policymanager.demo

* @Description: 螢幕鎖實作測試

* @author MZH

public class PolicySetupActivity extends Activity {

private static final int REQ_ACTIVATE_DEVICE_ADMIN = 10;

private static final String SCREEN_ID_KEY = "LAYOUT_ID";

/**存儲配置資訊的SP檔案名*/

private static final String APP_PREF = "APP_PREF";

/**有未知螢幕ID時傳回此辨別*/

private static final int UNKNOWN_SCREEN_ID = -1;

/**聲明元件*/

private Spinner mPasswordQualityInputField;

private EditText mPasswordLengthInputField;

private EditText mPasswordMinUppercaseInputField;

/**擷取配置操作類對象*/

private Policy mPolicy;

/**目前螢幕ID*/

private int mCurrentScreenId;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

mPolicy = new Policy(this);

}

protected void onResume() {

super.onResume();

/**擷取本地SP檔案中螢幕鎖的配置資訊*/

SharedPreferences prefs = getSharedPreferences(APP_PREF, MODE_PRIVATE);

final int savedScreenId = prefs.getInt(SCREEN_ID_KEY, UNKNOWN_SCREEN_ID);

/**如果擷取到的ID為空,則跳轉到設定頁*/

if (savedScreenId == UNKNOWN_SCREEN_ID || !mPolicy.isAdminActive()) {

setScreenContent(R.layout.activity_policy_setup);

/**跳轉到配置詳情頁*/

} else {

setScreenContent(savedScreenId);

}

/**

* 設定螢幕方法實作,詳細的可以自己看下,小馬也是邊參照官方文檔,邊學習的

* 有好想法..有問題的朋友們可以留言.我們一起學習

* @param screenId

private void setScreenContent(final int screenId) {

/**記錄目前螢幕ID，并預先存入本地SP配置檔案中*/

mCurrentScreenId = screenId;

setContentView(mCurrentScreenId);

getSharedPreferences(APP_PREF, MODE_PRIVATE).edit().putInt(

SCREEN_ID_KEY, mCurrentScreenId).commit();

switch (mCurrentScreenId) {

case R.layout.activity_policy_setup:

initPolicySetupScreen();

initNavigation();

break;

case R.layout.activity_view_policy:

initViewPolicyScreen();

* 關閉頁面時将目前配置寫入本地SP檔案中

protected void onPause() {

super.onPause();

if (mCurrentScreenId == R.layout.activity_policy_setup) writePolicy();

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

if (requestCode == REQ_ACTIVATE_DEVICE_ADMIN && resultCode == RESULT_OK) {

// User just activated the application as a device administrator.

setScreenContent(mCurrentScreenId);

super.onActivityResult(requestCode, resultCode, data);

* 重載傳回鍵方法,如果已目前螢幕為已設定密碼頁,則展示詳情

public void onBackPressed() {

if (mCurrentScreenId == R.layout.activity_view_policy) {

return;

super.onBackPressed();

* 初始化化設定頁

private void initPolicySetupScreen() {

mPasswordQualityInputField = (Spinner) findViewById(R.id.policy_password_quality);

mPasswordLengthInputField = (EditText) findViewById(R.id.policy_password_length);

mPasswordMinUppercaseInputField = (EditText) findViewById(R.id.policy_password_uppercase);

ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,

R.array.password_types, android.R.layout.simple_spinner_item);

adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

mPasswordQualityInputField.setAdapter(adapter);

mPasswordQualityInputField.setOnItemSelectedListener(

new AdapterView.OnItemSelectedListener() {

public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {

LinearLayout passwordMinUppercaseView =

(LinearLayout) findViewById(R.id.password_uppercase_view);

// The minimum number of upper case field is only applicable for password

// qualities: alpha, alphanumeric, or complex.

if (pos > 2)

passwordMinUppercaseView.setVisibility(View.VISIBLE);

else

passwordMinUppercaseView.setVisibility(View.GONE);

}

public void onNothingSelected(AdapterView<?> parent) {}

});

/**閱讀先前配置的相關資訊*/

mPolicy.readFromLocal();

mPasswordQualityInputField.setSelection(mPolicy.getPasswordQuality());

if (mPolicy.getPasswordLength() > 0) {

mPasswordLengthInputField.setText(String.valueOf(mPolicy.getPasswordLength()));

mPasswordLengthInputField.setText("");

if (mPolicy.getPasswordMinUpperCase() > 0) {

mPasswordMinUppercaseInputField.setText(

String.valueOf(mPolicy.getPasswordMinUpperCase()));

mPasswordMinUppercaseInputField.setText("");

* 初始化檢視詳情頁

private void initViewPolicyScreen() {

TextView passwordQualityView = (TextView) findViewById(R.id.policy_password_quality);

TextView passwordLengthView = (TextView) findViewById(R.id.policy_password_length);

// Read previously saved policy and populate on the UI.

int passwordQualitySelection = mPolicy.getPasswordQuality();

passwordQualityView.setText(

getResources().getStringArray(R.array.password_types)[passwordQualitySelection]);

passwordLengthView.setText(String.valueOf(mPolicy.getPasswordLength()));

if (passwordQualitySelection > 2) {

LinearLayout passwordMinUppercaseView =

(LinearLayout) findViewById(R.id.password_uppercase_view);

passwordMinUppercaseView.setVisibility(View.VISIBLE);

((TextView) findViewById(R.id.policy_password_uppercase)).setText(

* 設定導航資訊

private void initNavigation() {

if (!mPolicy.isAdminActive()) {

// Activates device administrator.

setupNavigation(R.string.setup_message_activate,

R.string.setup_action_activate,

mActivateButtonListener);

} else if (mCurrentScreenId == R.layout.activity_policy_setup) {

setupNavigation(R.string.setup_message_set_policy,

R.string.setup_action_set_policy,

new View.OnClickListener() {

public void onClick(View view) {

writePolicy();

mPolicy.configurePolicy();

setScreenContent(R.layout.activity_view_policy);

}

});

else if (!mPolicy.isActivePasswordSufficient()) {

// Launches password set-up screen in Settings.

setupNavigation(R.string.setup_message_enforce_policy,

R.string.setup_action_enforce_policy,

mEnforcePolicyListener);

// Grants access to secure content.

setupNavigation(R.string.setup_message_go_secured,

R.string.setup_action_go_secured,

startActivity(new Intent(view.getContext(), SecureActivity.class));

* 監聽器實作,這個小馬不多講了.

private View.OnClickListener mActivateButtonListener = new View.OnClickListener() {

@Override

public void onClick(View v) {

// First, persist the policy. Then, launch intent to trigger the system screen

// requesting user to confirm the activation of the device administrator.

writePolicy();

Intent activateDeviceAdminIntent =

new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);

activateDeviceAdminIntent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN,

mPolicy.getPolicyAdmin());

// It is good practice to include the optional explanation text to explain to

// user why the application is requesting to be a device administrator. The system

// will display this message on the activation screen.

activateDeviceAdminIntent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,

getResources().getString(R.string.device_admin_activation_message));

startActivityForResult(activateDeviceAdminIntent, REQ_ACTIVATE_DEVICE_ADMIN);

};

* 監聽器實作,這個小馬也不多講了.

private View.OnClickListener mEnforcePolicyListener = new View.OnClickListener() {

// The device administration API does not "fix" the password if it is

// determined that the current password does not conform to what is requested

// by the policy. The caller is responsible for triggering the password set up

// screen via the below intent.

Intent intent = new Intent(DevicePolicyManager.ACTION_SET_NEW_PASSWORD);

startActivity(intent);

* 設定激活按鈕不同狀态時的文本資訊

* @param messageResId

* @param buttonTextResId

* @param listener

private void setupNavigation(int messageResId, int buttonTextResId,

View.OnClickListener listener) {

TextView setupMessage = (TextView) findViewById(R.id.setup_message);

setupMessage.setText(messageResId);

Button actionBtn = (Button) findViewById(R.id.setup_action_btn);

actionBtn.setText(buttonTextResId);

actionBtn.setOnClickListener(listener);

// 在關閉此頁時，将配置資訊寫入本地SP檔案中.

private void writePolicy() {

int passwordQuality = (int) mPasswordQualityInputField.getSelectedItemId();

int passwordLength = 0;

try {

passwordLength = Integer.valueOf(mPasswordLengthInputField.getText().toString());

} catch (NumberFormatException nfe) {} // Defaults to 0.

int passwordMinUppercase = 0;

passwordMinUppercase =

Integer.valueOf(mPasswordMinUppercaseInputField.getText().toString());

mPolicy.saveToLocal(passwordQuality, passwordLength, passwordMinUppercase);

}

配置操作類:

import android.app.admin.DeviceAdminReceiver;

import android.content.ComponentName;

import android.content.Context;

import android.os.Build;

* @Title: Policy.java

* @Description: 用來擷取相關安全配置資訊的類

public class Policy {

public static final int REQUEST_ADD_DEVICE_ADMIN = 1;

/**儲存螢幕鎖相關參數的SP檔案名*/

/**下面三個是往SP中存儲時的Key*/

private static final String KEY_PASSWORD_LENGTH = "PW_LENGTH";

private static final String KEY_PASSWORD_QUALITY = "PW_QUALITY";

private static final String KEY_PASSWORD_MIN_UPPERCASE = "PW_MIN_UPPERCASE";

* 下面是可允許輸入密碼的類型,此處的類型必須與string.xml檔案中定義的arrays.xml中的相比對

final static int[] PASSWORD_QUALITY_VALUES = new int[] {

DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED,

DevicePolicyManager.PASSWORD_QUALITY_SOMETHING,

DevicePolicyManager.PASSWORD_QUALITY_NUMERIC,

DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC,

DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC,

DevicePolicyManager.PASSWORD_QUALITY_COMPLEX

private int mPasswordQuality;

private int mPasswordLength;

private int mPasswordMinUpperCase;

private Context mContext;

private DevicePolicyManager mDPM;

private ComponentName mPolicyAdmin;

* 構造器，在new此類對象時，擷取系統級管理者對象 DevicePolicyManager

* @param context

public Policy(Context context) {

mContext = context;

mPasswordQuality = -1;

mPasswordLength = 0;

mPasswordMinUpperCase = 0;

mDPM = (DevicePolicyManager) context.getSystemService(Context.DEVICE_POLICY_SERVICE);

mPolicyAdmin = new ComponentName(context, PolicyAdmin.class);

* 儲存裝置參數

public void saveToLocal(int passwordQuality, int passwordLength, int passwordMinUppercase) {

SharedPreferences.Editor editor =

mContext.getSharedPreferences(APP_PREF, Context.MODE_PRIVATE).edit();

if (mPasswordQuality != passwordQuality) {

editor.putInt(KEY_PASSWORD_QUALITY, passwordQuality);

mPasswordQuality = passwordQuality;

if (mPasswordLength != passwordLength) {

editor.putInt(KEY_PASSWORD_LENGTH, passwordLength);

mPasswordLength = passwordLength;

if (mPasswordMinUpperCase != passwordMinUppercase) {

editor.putInt(KEY_PASSWORD_MIN_UPPERCASE, passwordMinUppercase);

mPasswordMinUpperCase = passwordMinUppercase;

editor.commit();

* 從本地SP檔案中擷取密碼配置參數

public void readFromLocal() {

SharedPreferences prefs = mContext.getSharedPreferences(APP_PREF, Context.MODE_PRIVATE);

mPasswordQuality = prefs.getInt(KEY_PASSWORD_QUALITY, -1);

mPasswordLength = prefs.getInt(KEY_PASSWORD_LENGTH, -1);

mPasswordMinUpperCase = prefs.getInt(KEY_PASSWORD_MIN_UPPERCASE, -1);

* 擷取密碼.

* @return

public int getPasswordQuality() { return mPasswordQuality; }

* 擷取密碼長度.

public int getPasswordLength() { return mPasswordLength; }

* 擷取字母密碼.

public int getPasswordMinUpperCase() { return mPasswordMinUpperCase; }

* 擷取裝置管理的 ComponentName 對象.

public ComponentName getPolicyAdmin() { return mPolicyAdmin; }

* 判斷裝置是否被激活.

public boolean isAdminActive() {

return mDPM.isAdminActive(mPolicyAdmin);

public boolean isActivePasswordSufficient() {

return mDPM.isActivePasswordSufficient();

* 判斷裝置是否加安全

public boolean isDeviceSecured() {

return isAdminActive() && isActivePasswordSufficient();

* 在聲明的mDPM對象中進行配置.

public void configurePolicy() {

mDPM.setPasswordQuality(mPolicyAdmin, PASSWORD_QUALITY_VALUES[mPasswordQuality]);

mDPM.setPasswordMinimumLength(mPolicyAdmin, mPasswordLength);

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {

mDPM.setPasswordMinimumUpperCase(mPolicyAdmin, mPasswordMinUpperCase);

* 下面這個類用來監聽各種不同類型的裝置管理事件,比如:改變密碼..錯誤密碼等等

public static class PolicyAdmin extends DeviceAdminReceiver {

public void onDisabled(Context context, Intent intent) {

// Called when the app is about to be deactivated as a device administrator.

super.onDisabled(context, intent);

SharedPreferences prefs = context.getSharedPreferences(APP_PREF, Activity.MODE_PRIVATE);

/**清除以前在SP檔案下儲存的所有值*/

prefs.edit().clear().commit();

權限驗證類:

* @Title: SecureActivity.java

* @Description: 權限驗證類實作

public class SecureActivity extends Activity {

// Check to see if the device is properly secured as per the policy. Send user

// back to policy set up screen if necessary.

Policy policy = new Policy(this);

policy.readFromLocal();

if (!policy.isDeviceSecured()) {

Intent intent = new Intent();

intent.setClass(this, PolicySetupActivity.class);

intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP |

Intent.FLAG_ACTIVITY_CLEAR_TASK);

finish();

setContentView(R.layout.activity_secure);

吼吼,效果就這樣完成了,源碼小馬也放到附件裡面了,如果有需要的朋友可以自行下載下傳下的,有問題可直接留言,我們一起學習,一起進步,如有小馬講不好的地方,請朋友直接批評指點..小馬定感謝...謝謝..加油加油!

本文轉自華華世界 51CTO部落格，原文連結：http://blog.51cto.com/mzh3344258/791505，如需轉載請自行聯系原作者

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