Android Open Source - nfcunlocker Main Activity

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License

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

package com.steelrat.nfcunlocker;
/* w w w .  j ava 2s . c  om*/

import java.util.ArrayList;
import java.util.Map;

import com.actionbarsherlock.app.SherlockListActivity;
import com.actionbarsherlock.view.Menu;
import com.actionbarsherlock.view.MenuItem;
import com.steelrat.nfcunlocker.helpers.TagsStorage;
import com.steelrat.nfcunlocker.settingsactivity.SettingsActivityBase;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.nfc.NfcAdapter;
import android.os.Build;
import android.os.Bundle;
import android.provider.Settings;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.View;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.SimpleAdapter;
import android.widget.TextView;

public class MainActivity extends SherlockListActivity {
  TagsStorage mTagsStorage;
  SimpleAdapter mListAdapter;
  ArrayList<Map<String, String>> mTags;
  AlertDialog mDialog;
  boolean mIsDialog = true;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    
    // Load state.
    if (savedInstanceState != null) {
      mIsDialog = savedInstanceState.getBoolean("isDialog", true);
    }
    
    setContentView(R.layout.activity_main);
    
    if (mIsDialog)
      checkNFCState();
      
    registerForContextMenu(getListView());
    
    displayContent();
  }

  private void displayContent() {
    mTagsStorage = new TagsStorage(this);
    mTags = mTagsStorage.getAllTags();
    
    View listView = (View) findViewById(android.R.id.list);
    TextView informationText = (TextView) findViewById(R.id.errorText);
    String information = null;
    
    if (!isNfcSupported()) {
      information = getString(R.string.error_nfc_not_supported);
    } else if (mTags.isEmpty()) {
      information = getString(R.string.info_no_tags);
    }
    
    // Display information text instead of list.
    if (information != null) {
      listView.setVisibility(View.GONE);
      informationText.setText(information);
      informationText.setVisibility(View.VISIBLE);
      
      return;
    }
    
      String[] from = {"name", "id"};
      int[] to = {android.R.id.text1, android.R.id.text2};
    
      mListAdapter = new SimpleAdapter(this, mTags,
              android.R.layout.simple_list_item_2, from, to);
      
    setListAdapter(mListAdapter);
  }
  
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    Intent intent;
    
    switch(item.getItemId()) {
        case R.id.action_add:
          intent = new Intent(this, AddActivity.class);
        startActivity(intent);
        break;
      case R.id.action_settings:
        startActivity(SettingsActivityBase.getIntent(this));
        break;
      default:
        return super.onOptionsItemSelected(item);
    }  
    
    return true;
  }
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getSupportMenuInflater().inflate(R.menu.main, menu);
    return true;
  }
  
  @Override
  public void onCreateContextMenu(ContextMenu menu, View v,
                                  ContextMenuInfo menuInfo) {
      super.onCreateContextMenu(menu, v, menuInfo);
      
      getMenuInflater().inflate(R.menu.main_context, menu);
  }
  
  @Override
  public boolean onContextItemSelected(android.view.MenuItem item) {
      AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
      Map<String, String> tag = (Map<String, String>) mListAdapter.getItem(info.position);

      switch (item.getItemId()) {
          case R.id.action_delete:
            mTagsStorage.removeTag(tag.get("id"));
            mTags.remove(tag);
            mListAdapter.notifyDataSetChanged();
              return true;
          default:
              return super.onContextItemSelected(item);
      }
  }
  
  private boolean isNfcSupported() {
    NfcAdapter adapter = NfcAdapter.getDefaultAdapter(this);

    return adapter != null;
  }
  
  @Override
  protected void onDestroy() {
    super.onDestroy();
    
    if (mDialog != null)
      mDialog.dismiss();
  }
  
  @Override
  protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    
    outState.putBoolean("isDialog", mDialog != null && mDialog.isShowing());
  }
  
  private void checkNFCState() {
     NfcAdapter adapter = NfcAdapter.getDefaultAdapter(this);
     if (adapter == null) {
       return;
     }
       
     if (!adapter.isEnabled()) {
       AlertDialog.Builder builder = new AlertDialog.Builder(this);
       builder.setMessage(R.string.nfc_disabled_message)
              .setTitle(R.string.nfc_disabled_title)
              .setPositiveButton(R.string.enable, new DialogInterface.OnClickListener() {
            
            @Override
            public void onClick(DialogInterface dialog, int which) {
              if (Build.VERSION.SDK_INT >= 16) {  
                      startActivity(new Intent(Settings.ACTION_NFC_SETTINGS));
                  } else {
                      startActivity(new Intent(Settings.ACTION_WIRELESS_SETTINGS));
                  }
            }
          })
          .setNegativeButton(android.R.string.cancel, null);
       mDialog = builder.create();
       mDialog.show();
     } 
  }
}
Java Source Code List
