Android Open Source - 2014-Droid-code Main Activity

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License

The source code is released under:

GNU General Public License

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Java Source Code

package ca.campbell.week2_rw_views;
/*w ww.  ja v  a 2s.com*/
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

/*  
 *  Sample code Week 2
 *  Demonstrates programmatic manipulation of Views defined in xml.
 *  Demonstrates simple use of an intent to invoke a second activity.
 *  Check the manifest: min sdk 10 (2.3.[43] Gingerbread), target sdk 18 (4.3 Jellybean)
 */

public class MainActivity extends Activity {

  private static final String TAG = (String) "RW-VIEWS";
  private static final String SECRET = (String) "guacamole";

  // one may use string here, EditText.getText() returns CharSequence
  // android uses CharSequence so that other objs like StringBuffers may be
  // specified
  // a String is-a CharSequence, CharSequence operates more generally
  private CharSequence str;
  // private String str;

  // variables for references to the View widgets 
  private TextView msgHeader, msg; 
  private EditText et; 

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
  }

  // showData() is the method called by the View.OnClickListener()
  // defined in the xml in this case
  public void showData(View view) {
    // get the references to the view widgets
    // no reference to the header TextView, I don't manipulate it
    et = (EditText) findViewById(R.id.input);
    // get the data input
    str = et.getText().toString();

    msgHeader = (TextView) findViewById(R.id.resultheader);
    msgHeader.setVisibility(TextView.VISIBLE);

    msg = (TextView) findViewById(R.id.result);
    msg.setVisibility(TextView.VISIBLE);
    msg.setText(str);

    // need minimum api 9 for str.isEmpty() :(
    if (((String) str).isEmpty()) {
      msgHeader.setText(R.string.emptymsg);
      Log.w(TAG, "showData(): no data");
    } else {
      if (str.equals(SECRET)) {
        msgHeader.setText(R.string.successmsg);
        Log.w(TAG, "showData(): guessed correctly");
      } else {
        msgHeader.setText(R.string.tryagainmsg);
        Log.w(TAG, "showData(): bad guess");
      }
    }
  } // showData()

  public void clearData(View view) {
    if (msgHeader != null ) {
      msgHeader.setVisibility(TextView.INVISIBLE);
      msg.setVisibility(TextView.INVISIBLE);
      et.setText("");
      Log.w(TAG, "clearData(): reset fields");
    }
    Log.w(TAG, "clearData(): fields not set yet");
  } // clearData()
  
  public void showActivity(View view) {
    Log.d(TAG, "showActivity(): fire intent");
    Intent launchOtherScreen = new Intent(getApplicationContext(),
        Activity2.class);
    startActivity(launchOtherScreen);
  } // showActivity()
}

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