Android 화면 잠 금 원본 상세 설명 구현

최근 에 어떤 친구 가 화면 잠 금 에 대해 물 었 습 니 다.자신 도 공 부 를 하고 있 습 니 다.인터넷 에서 찾 아 봤 지만 상세 한 예 가 없습니다.보 는 자료 책 에 도 화면 잠 금 프로그램 에 대한 소개 가 없습니다.작은 결심 을 하고 공식 문서 에 따라 공 부 를 했 습 니 다.지금 은 잘 했 습 니 다.쓸데없는 말 을 하지 않 고 캡 처 를 먼저 보 내 고 효 과 를 보고 주의해 야 할 부분 에 주석 을 달 겠 습 니 다.문제 가 있 는 친 구 는 직접 메 시 지 를 남 길 수 있 습 니 다.우 리 는 함께 학습 하고 교류 하 며 함께 진 보 를 향상 시 킬 수 있 습 니 다!효과 도 직접 보기:
1.비밀 번 호 를 설정 하지 않 았 을 때 시스템 설정 에 들 어 가 는 효과 도 는 다음 과 같 습 니 다.
 
2:비밀번호 설정 미리보기:

3:암호 복호화 효과 그림

4:구 궁 격 복호화 시 효과 도

다음은 간단하게 소스 코드 를 보 겠 습 니 다.여기 서 말씀 드 리 겠 습 니 다.이 작은 DEMO 도 임시로 배 웠 습 니 다.잘 모 르 는 부분 이 있 으 면 친구 에 게 직접 비판 하고 지적 하 세 요.잘못 이 있 으 면 반드시 고 칠 것 입 니 다.호 호 는 코드 를 보 겠 습 니 다.
주 제어 클래스:

 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:        
  * @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";
  /**       SP   */
  private static final String APP_PREF = "APP_PREF";
  /**     ID      */
  private static final int UNKNOWN_SCREEN_ID = -1;
  /**    */
  private Spinner mPasswordQualityInputField;
  private EditText mPasswordLengthInputField;
  private EditText mPasswordMinUppercaseInputField;
  /**         
  */
  private Policy mPolicy;
  /**    ID*/
  private int mCurrentScreenId;
  @Override
  public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  mPolicy = new Policy(this);
  }
  @Override
  protected void onResume() {
  super.onResume();
  /**    SP           */
  SharedPreferences prefs = getSharedPreferences(APP_PREF, MODE_PRIVATE);
  final int savedScreenId = prefs.getInt(SCREEN_ID_KEY, UNKNOWN_SCREEN_ID);
  /**      ID  ,       */
  if (savedScreenId == UNKNOWN_SCREEN_ID || !mPolicy.isAdminActive()) {
  setScreenContent(R.layout.activity_policy_setup);
  /**        */
  } else {
  setScreenContent(savedScreenId);
  }
  }
  /**
  *         ,         ,          ,    
  *                .      
  * @param screenId
  */   private void setScreenContent(final int screenId) {
  /**      ID,       SP     */
  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;
  }
  }
  /**
  *               SP   
  */
  @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);
  }
  }
  /**
  *        ,              ,     
  */
  @Override
  public void onBackPressed() {
  if (mCurrentScreenId == R.layout.activity_view_policy) {
  setScreenContent(R.layout.activity_policy_setup);
  return;
  }    
  super.onBackPressed();
  }
  /**
  *        
  */
  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) {}
  });
  /**           */
  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("");
  }
  }
  /**
  *         
  */
  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()));
  }
  }
  /**
  *       
  */
  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));         
    }          
   });
  }
  }
  /**
  *      ,      .
  */
  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);
  }
  };
  /**
  *      ,         .
  */
  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);
  }
  };
  /**
  *                 
  * @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);
  }
  //       ,         SP   .
  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);
  }
  }
작업 클래스 설정:

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:               
  * @author MZH */ public class Policy {
  public static final int REQUEST_ADD_DEVICE_ADMIN = 1;
  /**          SP   */
  private static final String APP_PREF = "APP_PREF";
  /**      SP     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";
  /**
  *              ,        string.xml      arrays.xml     
  */   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;
  /**
  *    , new     ,           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);
  }
  /**
  *       
  */
  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();
  }
  /**
  *    SP           
  */
  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);
  }
  /**
  *     .
  *
  * @return
  */
  public int getPasswordQuality() { return mPasswordQuality; }
  /**
  *       .
  *
  * @return
  */
  public int getPasswordLength() { return mPasswordLength; }
  /**
  *       .
  *
  * @return
  */
  public int getPasswordMinUpperCase() { return mPasswordMinUpperCase; }
  /**
  *         ComponentName   .
  *
  * @return
  */
  public ComponentName getPolicyAdmin() { return mPolicyAdmin; }
  /**
  *          .
  *
  * @return
  */
  public boolean isAdminActive() {
  return mDPM.isAdminActive(mPolicyAdmin);
  }
  public boolean isActivePasswordSufficient() {
  return mDPM.isActivePasswordSufficient();
  }
  /**
  *          
  * @return
  */
  public boolean isDeviceSecured() {
  return isAdminActive() && isActiveP
  asswordSufficient();   }
  /**
  *     mDPM       .
  */
  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);
  }
  }
  /**
  *                       ,  :          
  */
  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);
  /**     SP         */
  prefs.edit().clear().commit();
  }
  }
  }
권한 검증 클래스:

package com.xiaoma.policymanager.demo;
import android.app.Activity;
import android.content.Intent;
/**
* @Title: SecureActivity.java
* @Package com.xiaoma.policymanager.demo
* @Description:        
* @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);
}
}
본 고 에서 말 한 것 이 당신 에 게 도움 이 되 기 를 바 랍 니 다.안 드 로 이 드 는 화면 잠 금 소스 코드 를 실현 하 는 상세 한 내용 을 소개 합 니 다.저희 사 이 트 를 계속 지 켜 봐 주시 기 바 랍 니 다!안 드 로 이 드 를 배우 고 싶 으 면 본 사이트 에 계속 관심 을 가 져 도 됩 니 다.

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