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Android屏幕锁定实例源码详解教程二
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最近有朋友问屏幕锁定的问题,自己也在学习,网上找了下也没太详细的例子,看的资料书上也没有有关屏幕锁定程序的介绍,下个小决心,自己照着官方文档学习下,现在做好了,废话不多说,先发下截图,看下效果,需要注意的地方会加注释,有问题的朋友可以直接留言,我们共同学习交流,共同提高进步!直接看效果图:

一:未设置密码时进入系统设置的效果图如下:

二:运行DEMO,进入应用时:

三:设置密码方式预览:

四:只设置密码保护时的效果图

五:密码解密效果图

六:设置九宫格加密时的效果图

七:九宫格解密时的效果图

八:解密成功后,进入我们手机系统的图

下面来简单的看下源码吧,此处讲下,这个小DEMO也是临时学习下的,有讲的不明白的地方请朋友直接批评指出,有错肯定改的,吼吼看代码:
        主控制类:

   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: 屏幕锁实现测试  * @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" ;   /** 存储配置信息的SP文件名 */   private static final String APP_PREF = "APP_PREF" ;   /** 有未知屏幕ID时返回此标识 */   private static final int UNKNOWN_SCREEN_ID = -1 ;   /** 声明组件 */   private Spinner mPasswordQualityInputField;   private EditText mPasswordLengthInputField;   private EditText mPasswordMinUppercaseInputField;   /** 获取配置操作类对象   */   private Policy mPolicy;   /** 当前屏幕ID */   private int mCurrentScreenId;  @Override   public void onCreate(Bundle savedInstanceState) {   super .onCreate(savedInstanceState);  mPolicy = new Policy( this );  }  @Override   protected void onResume() {   super .onResume();   /** 获取本地SP文件中屏幕锁的配置信息 */   SharedPreferences fs = getSharedPreferences(APP_PREF, MODE_PRIVATE);    final int savedScreenId = fs.getInt(SCREEN_ID_KEY, UNKNOWN_SCREEN_ID);   /** 如果获取到的ID为空,则跳转到设置页 */   if (savedScreenId == UNKNOWN_SCREEN_ID || !mPolicy.isAdminActive()) {  setScreenContent(R.layout.activity_policy_setup);   /** 跳转到配置详情页 */   } else {  setScreenContent(savedScreenId);  }  }   /**   * 设置屏幕方法实现,详细的可以自己看下,我也是边参照官方文档,边学习的  * 有好想法有问题的朋友们可以留言.我们一起学习  * @param screenId   */ private void setScreenContent( final int screenId) {   /** 记录当前屏幕ID,并预先存入本地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 ;  }  }   /**   * 关闭页面时将当前配置写入本地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);  }  }   /**   * 重载返回键方法,如果已当前屏幕为已设置密码页,则展示详情   */   @Override   public void onBackPressed() {   if (mCurrentScreenId == R.layout.activity_view_policy) {  setScreenContent(R.layout.activity_policy_setup);   return ;  } super .onBackPressed();  }   /**   * 初始化化设置页   */   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) {}  });   /** 阅读先前配置的相关信息 */   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("" );  }  }   /**   * 初始化查看详情页   */   private void initViewPolicyScreen() {  TextView passwordQualityView = (TextView) findViewById(R.id.policy_password_quality); TextView passwordLengthView = (TextView) findViewById(R.id.policy_password_length);   // Read viously 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()));   }   }    /**   * 设置导航信息    */    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 )); } });   }   }    /**   * 监听器实现,这个不多讲了.    */    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);   }   };    /**   * 监听器实现,这个小马也不多讲了.    */    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);   }   };    /**   * 设置激活按钮不同状态时的文本信息   * @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);   }    // 在关闭此页时,将配置信息写入本地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);   }   }

配置操作类:

   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: 用来获取相关安全配置信息的类   * @author MZH */ public class Policy {    public static final int REQUEST_ADD_DEVICE_ADMIN = 1 ;    /** 保存屏幕锁相关参数的SP文件名 */    private static final String APP_PREF = "APP_PREF" ;    /** 下面三个是往SP中存储时的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" ;    /**   * 下面是可允许输入密码的类型,此处的类型必须与string.xml文件中定义的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;    /**   * 构造器,在new此类对象时,获取系统级管理员对象 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 );   }    /**   * 保存设备参数    */    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();   }    /**   * 从本地SP文件中获取密码配置参数    */    public void readFromLocal() {   SharedPreferences fs = mContext.getSharedPreferences(APP_PREF, Context.MODE_PRIVATE); mPasswordQuality = fs.getInt(KEY_PASSWORD_QUALITY, -1 );   mPasswordLength = fs.getInt(KEY_PASSWORD_LENGTH, -1 );  mPasswordMinUpperCase = fs.getInt(KEY_PASSWORD_MIN_UPPERCASE, -1 );   }    /**   * 获取密码.   *   * @return    */    public int getPasswordQuality() { return mPasswordQuality; }    /**   * 获取密码长度.   *   * @return    */    public int getPasswordLength() { return mPasswordLength; }    /**   * 获取字母密码.   *   * @return    */    public int getPasswordMinUpperCase() { return mPasswordMinUpperCase; }    /**   * 获取设备管理的 ComponentName 对象.   *   * @return    */    public ComponentName getPolicyAdmin() { return mPolicyAdmin; }    /**   * 判断设备是否被激活.   *   * @return    */    public boolean isAdminActive() {    return mDPM.isAdminActive(mPolicyAdmin);   }    public boolean isActivePasswordSufficient() {    return mDPM.isActivePasswordSufficient();   }    /**   * 判断设备是否加安全   * @return    */    public boolean isDeviceSecured() {    return isAdminActive() && isActiveP   asswordSufficient(); }    /**   * 在声明的mDPM对象中进行配置.    */    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);   }   }    /**   * 下面这个类用来监听各种不同类型的设备管理事件,比如:改变密码错误密码等等    */    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 fs = context.getSharedPreferences(APP_PREF, Activity.MODE_PRIVATE);   /** 清除以前在SP文件下保存的所有值 */   fs.edit().clear().commit();   }   }   }

权限验证类:

package com.xiaoma.policymanager.demo; import android.app.Activity; import android.content.Intent; /** * @Title: SecureActivity.java * @Package com.xiaoma.policymanager.demo * @Description: 权限验证类实现 * @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); } }

 

 

 


原文链接:http://www.cnblogs.com/vus520/archive/2011/10/05/2561939.html
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