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 Android教程網 >> Android技術 >> 關於Android編程 >> Android實現屏幕鎖定源碼詳解

Android實現屏幕鎖定源碼詳解

編輯:關於Android編程

最近有朋友問屏幕鎖定的問題,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屏幕鎖定程序的介紹,下個小決心,自己照著官方文檔學習下,現在做好了,廢話不多說,先發下截圖,看下效果,需要注意的地方會加注釋,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:未設置密碼時進入系統設置的效果圖如下:

 

二:設置密碼方式預覽:

三:密碼解密效果圖

四:九宮格解密時的效果圖

下面來簡單的看下源碼吧,此處講下,這個小DEMO也是臨時學習下的,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:

主控制類:

 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: 屏幕鎖實現測試
  * @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";
  /**存儲配置信息的SP文件名*/
  private static final String APP_PREF = "APP_PREF";
  /**有未知屏幕ID時返回此標識*/
  private static final int UNKNOWN_SCREEN_ID = -1;
  /**聲明組件*/
  private Spinner mPasswordQualityInputField;
  private EditText mPasswordLengthInputField;
  private EditText mPasswordMinUppercaseInputField;
  /**獲取配置操作類對象
  */
  private Policy mPolicy;
  /**當前屏幕ID*/
  private int mCurrentScreenId;
  @Override
  public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  mPolicy = new Policy(this);
  }
  @Override
  protected void onResume() {
  super.onResume();
  /**獲取本地SP文件中屏幕鎖的配置信息*/
  SharedPreferences prefs = getSharedPreferences(APP_PREF, MODE_PRIVATE);
  final int savedScreenId = prefs.getInt(SCREEN_ID_KEY, UNKNOWN_SCREEN_ID);
  /**如果獲取到的ID為空,則跳轉到設置頁*/
  if (savedScreenId == UNKNOWN_SCREEN_ID || !mPolicy.isAdminActive()) {
  setScreenContent(R.layout.activity_policy_setup);
  /**跳轉到配置詳情頁*/
  } else {
  setScreenContent(savedScreenId);
  }
  }
  /**
  * 設置屏幕方法實現,詳細的可以自己看下,我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) {
  /**記錄當前屏幕ID,並預先存入本地SP配置文件中*/
  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();
  initNavigation();
  break;
  }
  }
  /**
  * 關閉頁面時將當前配置寫入本地SP文件中
  */
  @Override
  protected void onPause() {
  super.onPause();
  if (mCurrentScreenId == R.layout.activity_policy_setup) writePolicy();
  }
  @Override
  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);
  } else {
  super.onActivityResult(requestCode, resultCode, data);
  }
  }
  /**
  * 重載返回鍵方法,如果已當前屏幕為已設置密碼頁,則展示詳情
  */
  @Override
  public void onBackPressed() {
  if (mCurrentScreenId == R.layout.activity_view_policy) {
  setScreenContent(R.layout.activity_policy_setup);
  return;
  }    
  super.onBackPressed();
  }
  /**
  * 初始化化設置頁
  */
  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信息*/
  mPolicy.readFromLocal();
  mPasswordQualityInputField.setSelection(mPolicy.getPasswordQuality());
  if (mPolicy.getPasswordLength() > 0) {
  mPasswordLengthInputField.setText(String.valueOf(mPolicy.getPasswordLength()));
  } else {
  mPasswordLengthInputField.setText("");
  }
  if (mPolicy.getPasswordMinUpperCase() > 0) {
  mPasswordMinUppercaseInputField.setText(
  String.valueOf(mPolicy.getPasswordMinUpperCase()));
  } else {
  mPasswordMinUppercaseInputField.setText("");
  }
  }
  /**
  * 初始化查看詳情頁
  */
  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.
  mPolicy.readFromLocal();
  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(          
   String.valueOf(mPolicy.getPasswordMinUpperCase()));
  }
  }
  /**
  * 設置導航信息
  */
  private void initNavigation() {
  if (!mPolic
  y.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);
  } else {
  // Grants access to secure content.
  setupNavigation(R.string.setup_message_go_secured,
  R.string.setup_action_go_secured,
  new View.OnClickListener() {
  public void onClick(View view) {
  startActivity(new Intent(view.getContext(), SecureActivity.class));         
    }          
   });
  }
  }
  /**
  * 監聽器實現,這個不多講了.
  */
  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);
  }
  };
  /**
  * 監聽器實現,這個小馬也不多講了.
  */
  private View.OnClickListener mEnforcePolicyListener = new View.OnClickListener() {
  @Override
  public void onClick(View v) {
  writePolicy();
  // 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);
  }
  };
  /**
  * 設置激活按鈕不同狀態時的文本信息
  * @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,將配置信息寫入本地SP文件中.
  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;
  try {
  passwordMinUppercase =
  Integer.valueOf(mPasswordMinUppercaseInputField.getText().toString());
  } catch (NumberFormatException nfe) {} // Defaults to 0.
  mPolicy.saveToLocal(passwordQuality, passwordLength, passwordMinUppercase);
  }
  }

配置操作類:

package com.xiaoma.policymanager.demo;
  import android.app.Activity;
  import android.app.admin.DeviceAdminReceiver;
  import android.app.admin.DevicePolicyManager;
  import android.content.ComponentName;
  import android.content.Context;
  import android.content.Intent;
  import android.content.SharedPreferences;
  import android.os.Build;
  /**
  *
  @Title: Policy.java
  * @Package com.xiaoma.policymanager.demo
  * @Description: 用來獲取相關安全配置信息的類
  * @author MZH */ public class Policy {
  public static final int REQUEST_ADD_DEVICE_ADMIN = 1;
  /**保存屏幕鎖相關參數的SP文件名*/
  private static final String APP_PREF = "APP_PREF";
  /**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文件中定義的arrays.xml中的相匹配
  */   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,獲取系統級管理員對象 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);
  }
  /**
  * 保存設備參數
  */
  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文件中獲取密碼配置參數
  */
  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);
  }
  /**
  * 獲取密碼.
  *
  * @return
  */
  public int getPasswordQuality() { return mPasswordQuality; }
  /**
  * 獲取密碼長度.
  *
  * @return
  */
  public int getPasswordLength() { return mPasswordLength; }
  /**
  * 獲取字母密碼.
  *
  * @return
  */
  public int getPasswordMinUpperCase() { return mPasswordMinUpperCase; }
  /**
  * 獲取設備管理的 ComponentName 對象.
  *
  * @return
  */
  public ComponentName getPolicyAdmin() { return mPolicyAdmin; }
  /**
  * 判斷設備是否被激活.
  *
  * @return
  */
  public boolean isAdminActive() {
  return mDPM.isAdminActive(mPolicyAdmin);
  }
  public boolean isActivePasswordSufficient() {
  return mDPM.isActivePasswordSufficient();
  }
  /**
  * 判斷設備是否加安全
  * @return
  */
  public boolean isDeviceSecured() {
  return isAdminActive() && isActiveP
  asswordSufficient();   }
  /**
  * 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設備管理事件,比如:改變密碼錯誤密碼等等
  */
  public static class PolicyAdmin extends DeviceAdminReceiver {
  @Override
  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文件下保存的所有值*/
  prefs.edit().clear().commit();
  }
  }
  }

權限驗證類:

package com.xiaoma.policymanager.demo;
import android.app.Activity;
import android.content.Intent;
/**
* @Title: SecureActivity.java
* @Package com.xiaoma.policymanager.demo
* @Description: 權限驗證類實現
* @author MZH
*/
public class SecureActivity extends Activity {
@Override
protected void onResume() {
super.onResume();
// 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);
startActivity(intent);
finish();
}
setContentView(R.layout.activity_secure);
}
}

希望本文所述對你有所幫助,Android實現屏幕鎖定源碼詳解內容就給大家介紹到這裡了。希望大家繼續關注我們的網站!想要學習Android可以繼續關注本站。

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