Android Open Source - android-ocw Course Search Activity

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License

The source code is released under:

GNU General Public License

Java Source Code

package app.ocw;
// www .j  a  va 2  s  . co  m
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnKeyListener;
import android.widget.Button;
import android.widget.EditText;

/**
 * The main screen to the app for searching through OCW
 * 
 * @author Nick Ferraro
 *
 */
public class CourseSearchActivity extends Activity {
  private EditText searchText = null;
  private Button searchButton = null;
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_course_search);
    
    // Get a reference to our views
    searchText = (EditText)findViewById(R.id.search);
    searchButton = (Button)findViewById(R.id.search_button);
    
    // Set a text changed callback for search to enable/disable our search button
    searchText.addTextChangedListener(new TextWatcher() {
      @Override
      public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

      @Override
      public void onTextChanged(CharSequence s, int start, int before, int count) {}

      @Override
      public void afterTextChanged(Editable s) {
        searchButton.setEnabled(searchText.getText().toString().length() > 0);
      }
    });
    
    // Set a key listener callback so that users can search by pressing "Enter"
    searchText.setOnKeyListener(new OnKeyListener() {
      @Override
      public boolean onKey(View v, int keyCode, KeyEvent event) {  
        if( keyCode == KeyEvent.KEYCODE_ENTER ) {
          if( event.getAction() == KeyEvent.ACTION_UP ) {
            searchFor(searchText.getText().toString());
          }
          return true;
        }
        return false;
      }
    });
    
    // Set a search button callback
    searchButton.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
        searchFor(searchText.getText().toString());
      }
    });
  }
  
  @Override
  public void onResume() {
    super.onResume();
    searchText.requestFocus();
  }
  
  private void searchFor(String search) {
    // If the search string is not empty, launch the course list intent and hand in the search string
    if( search != null && search.length() > 0 ) {
      Intent searchIntent = new Intent(this, CourseListActivity.class);
      searchIntent.putExtra(CourseListActivity.EXTRA_SEARCH, search);
      startActivity(searchIntent);
    }
  }
}

Java Source Code List

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