Android Open Source - nfcunlocker Settings Activity Base

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License

The source code is released under:
Apache License
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Java Source Code

package com.steelrat.nfcunlocker.settingsactivity;
/* w  w  w . j a  va 2  s.  c o m*/
import android.app.admin.DevicePolicyManager;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.os.Build;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.text.method.LinkMovementMethod;
import android.view.ViewGroup;
import android.widget.TextView;

import com.actionbarsherlock.app.SherlockPreferenceActivity;
import com.actionbarsherlock.view.MenuItem;
import com.steelrat.nfcunlocker.NFCApplication;
import com.steelrat.nfcunlocker.R;
import com.steelrat.nfcunlocker.helpers.AppDeviceAdminReceiver;
import com.steelrat.nfcunlocker.unlockmethods.UnlockMethod;
import com.steelrat.nfcunlocker.unlockmethods.UnlockMethodFactory;

public abstract class SettingsActivityBase extends SherlockPreferenceActivity implements
    OnSharedPreferenceChangeListener {
  ComponentName mAppDeviceAdmin;
  DevicePolicyManager mDPM;
  UnlockMethod mPrevUnlockMethod;
  SharedPreferences mPreferences;
  Editor mEditor;
  private static final int ADMIN_REQUEST_CODE = 1;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    mPreferences = PreferenceManager
        .getDefaultSharedPreferences(this);
    mEditor = mPreferences.edit();
    mDPM = (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);
    mAppDeviceAdmin = new ComponentName(this, AppDeviceAdminReceiver.class);    
    mPrevUnlockMethod = UnlockMethodFactory.getUnlockMethod(this,
        mPreferences.getString("unlock_method", ""));
    
    mPreferences.registerOnSharedPreferenceChangeListener(this);
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case android.R.id.home:
      // We use "finish" because PreferenceActivity creates separate
      // activities for each preference screen (API <10 && single pane).
      finish();
      break;
    default:
      return super.onOptionsItemSelected(item);
    }

    return true;
  }

  /**
   * Checks if application has administrative permissions.
   * 
   * @return Returns true if it has or false otherwise.
   */
  protected boolean isActiveAdmin() {
    return mDPM.isAdminActive(mAppDeviceAdmin);
  }

  @Override
  public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
      String key) {
    if (key.equals("password") && isActiveAdmin()) {
      // Set screen lock password.
      mDPM.resetPassword(sharedPreferences.getString(key, ""), 0);
    }
  }

  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == ADMIN_REQUEST_CODE) {
      if (resultCode == RESULT_OK) {
        
      }
    }
  }
  
  /**
   * Sends admin rights request to user.
   */
  protected void enableAdmin() {
    if (!isActiveAdmin()) {
      // Launch the activity to have the user enable our admin.
      Intent intent = new Intent(
          DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
      intent.putExtra(
          DevicePolicyManager.EXTRA_DEVICE_ADMIN,
          mAppDeviceAdmin);
      intent.putExtra(
          DevicePolicyManager.EXTRA_ADD_EXPLANATION,
          getString(R.string.device_admin_description));
      startActivityForResult(intent, ADMIN_REQUEST_CODE);
    }
  }
  
  /**
   * Deactivates current unlock method (if set) and activates new method.
   * 
   * @param name Method name.
   * @return Returns true if new method was successfully activated or false 
   * on error (previous method will be reactivated).
   */
  protected boolean changeUnlockMethod(String name) {
    UnlockMethod unlockMethod = UnlockMethodFactory.getUnlockMethod(this,
        name);

    if (unlockMethod.equals(mPrevUnlockMethod)) {
      return true;
    }
    
    // Deactivate previous unlock method.
    if (mPrevUnlockMethod != null) {
      mPrevUnlockMethod.onDeactivate();
    }

    if (unlockMethod.onActivate()) {
      // Set previous method to current. This is needed if user will
      // change unlock methods more then once without leaving 
      // SettingsActivity.
      mPrevUnlockMethod = unlockMethod;
    } else {
      // Reactivate previous method on error.
      if (mPrevUnlockMethod != null) {
        mPrevUnlockMethod.onActivate();
      }
      
      return false;
    }
    
    return true;
  }
  
  /**
   * Loads About page layout.
   * 
   * @param aboutView Root view of About page.
   */
  protected void loadAbout(ViewGroup aboutView) {
    String version = NFCApplication.getVersion();
    
    TextView versionText = (TextView) aboutView.findViewById(R.id.versionText);
    versionText.setText(String.format(versionText.getText().toString(), version));
    
    TextView githubText = (TextView) aboutView.findViewById(R.id.githubText);
    githubText.setMovementMethod(LinkMovementMethod.getInstance());
  }
  
  public static Intent getIntent(Context c) {
    Class<? extends SettingsActivityBase> intentClass;
    if (Build.VERSION.SDK_INT<Build.VERSION_CODES.HONEYCOMB) {
      intentClass = SettingsActivityOA.class;
    }
        else {
          intentClass = SettingsActivity.class;
        }
    
    return new Intent(c, intentClass);
  }
}
Java Source Code List
