Android Open Source - sodf Main Activity

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License

The source code is released under:

Copyright (c) 2013 Lorenz Lehmann Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Sof...

Java Source Code

package lal.sodf.example;
//from   w w w  . j av  a  2s  .c o  m
import lal.sodf.framework.R;
import lal.sodf.framework.SodfCallback;
import lal.sodf.framework.SodfFramework;
import lal.sodf.framework.SodfWrapper;
import lal.sodf.framework.exceptions.MalformedTypeException;
import lal.sodf.framework.exceptions.TagEmptyException;
import lal.sodf.framework.exceptions.UnformattedTagException;
import lal.sodf.framework.ontology.KeyValueNode;
import lal.sodf.framework.ontology.SodfTree;
import lal.sodf.framework.parser.SodfParser;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.Intent;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.Menu;
import android.widget.TextView;

public class MainActivity extends Activity implements SodfCallback{
  
  private TextView dataText;
  private Handler handler;
  private Tag tag;
  private PendingIntent pendingIntent;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    
    //initialize private variables
    dataText = (TextView) findViewById(R.id.dataView);
    handler = new Handler();
    pendingIntent = PendingIntent.getActivity(this, 0, new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
    
    //get the data transmitted with the intent
    handleIntent(getIntent());
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
  }
  
  /* (non-Javadoc)
   * @see android.app.Activity#onResume()
   */
  @Override
  protected void onResume() {
    super.onResume();
    //get priority for all NFC tags that are discovered while this app is running
    //filters and techLists are null to get all NFC tags
    NfcAdapter.getDefaultAdapter(this).enableForegroundDispatch(this, pendingIntent, null, null);
  }

  /* (non-Javadoc)
   * @see android.app.Activity#onPause()
   */
  @Override
  protected void onPause() {
    //has to be disabled because the app is not in foreground anymore
    NfcAdapter.getDefaultAdapter(this).disableForegroundDispatch(this);
    super.onPause();
  }

  /* (non-Javadoc)
   * @see android.app.Activity#onNewIntent(android.content.Intent)
   */
  @Override
  protected void onNewIntent(Intent intent) {
    handleIntent(intent);
  }
  
  /** Handle the intent to determine if an NFC tag was discovered*/
  private void handleIntent(Intent i){
    tag = i.getParcelableExtra(NfcAdapter.EXTRA_TAG);
    if (tag == null){
      Log.i("SODF Example", "No NFC tag detected");
      //do nothing
    }
    else {
      Log.i("SODF Example", "NFC tag detected");
      //read the data from tag
      SodfFramework.readData(tag, this);
    }    
  }

  @Override
  public void readComplete(final SodfWrapper data) {
    //this has to run in a handler since it is called from another thread
    handler.post(new Runnable(){
      @Override
      public void run() {
        Log.i("SODF Example","Read complete");
        //ensure that there was no error
        if (data.exception != null){
          Log.w("SODF Example","Exception when reading data");
          dataText.setText("Error: ");
          dataText.append(data.exception.toString());
          //if the tag is unformatted there will be an unformatted exception in any case so we just try to write sth now
          if (data.exception instanceof MalformedTypeException
              || data.exception instanceof UnformattedTagException
              || data.exception instanceof TagEmptyException){
            Log.i("SODF Example", "Reading data failed, maybe because the tag is used for the first time with this example... trying to write data");
            writeData();
          }
        }
        else {//write all the stuff in a text box on the layout
          dataText.setText("App: "+data.app+"\n"
              + "Compression: "+data.compressionAlgorithm+"\n"
              + "Data on tag: "+SodfParser.serializeTree(data.data));
        }
      }      
    });
  }
  
  /** Write data on the tag */
  private void writeData(){
    Log.i("SODF Example","Trying to write data on tag");
    SodfTree data = new SodfTree();
    data.getPropertiesSubtree().addChild(new KeyValueNode("sodf:test", "sodf example"));
    SodfFramework.writeData(tag, data, "lal.sodf.framework.example", this);
  }

  @Override
  public void writeComplete(final int resultCode) {
    //this has to run in a handler since it is called from another thread
    handler.post(new Runnable(){
      @Override
      public void run() {
        Log.i("SODF Example","Write complete: "+resultCode);
        dataText.setText("Wrote example data on tag. Touch again to read");
      }});
  }

}

Java Source Code List

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