Android Open Source - FallApp Activity Fall Height

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License

The source code is released under:

MIT License

Java Source Code

package ie.lc.fallApp;
//from  www  .  j a v a2 s  .c  om
import java.text.DecimalFormat;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.text.Editable;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.*;





public class ActivityFallHeight extends Activity
{
  private              double persistentRandomNumber;
  private static final String persistentRandomNumberKey = "prn";

  private final int       planetRequestCode = 1337;
  private final Interlock fieldInterlock    = new Interlock();
  
  
  
  
  
  protected void onCreate( Bundle savedInstanceState ) {
    super.onCreate( savedInstanceState );
    setContentView( R.layout.activity_fall );
    setupActions();
    
    persistentRandomNumber = Math.random() * 10.0;
  }
  
  
  
  
  
  protected void onSaveInstanceState( Bundle out ) {
    out.putDouble( persistentRandomNumberKey, persistentRandomNumber );
    showToastMessage( "Saved instance variable: " + persistentRandomNumber );
  }
  
  
  
  
  
  protected void onRestoreInstanceState( Bundle in ) {
    persistentRandomNumber = in.getDouble( persistentRandomNumberKey );
    showToastMessage( "Restored instance variable: " + persistentRandomNumber );
  }
  
  
  
  
  
  protected void onActivityResult( int requestCode, int resultCode, Intent data ) {
    if (requestCode == planetRequestCode
    &&  resultCode  == RESULT_OK) {
      Bundle extras = data.getExtras();
      Planet selectedPlanet = (Planet) extras.getSerializable( Common.planetSelectIdentifier );
      Planet activePlanet   = Physics.getActivePlanet();
      
      if ( ! selectedPlanet.equals(activePlanet)) {
        Physics.setActivePlanet( selectedPlanet );
        showToastMessage( getString(R.string.planetChanged) + " " + selectedPlanet + "." );
        updateDisplayedHeightFromVelocity();
      }
    }
  }
  
  
  
  
  
  public boolean onCreateOptionsMenu( Menu menu ) {
    getMenuInflater().inflate( R.menu.fall_height, menu );
    return true;
  }
  
  
  
  
  
  /** Used by computeAndShow */
  private interface ComputeCallback {
    double execute( String textInput ) throws NumberFormatException;
  }
  
  
  
  
  
  private void computeAndShow( EditText targetField, String textInput, ComputeCallback comp ) {
    if ( ! fieldInterlock.isLocked()) {
      fieldInterlock.setLocked( true );
      String textOutput = "";
      
      try {
        double num = comp.execute( textInput );
        textOutput = formatTwoDecimalPlaces( num );
      }
      catch (Exception ex) {
        // Ducked
      }
      
      targetField.setText( textOutput );
      fieldInterlock.setLocked( false );
    }
  }
  
  
  
  
  
  private void setupActions() {
    final EditText velocityField = (EditText) findViewById( R.id.velocityField );
    final EditText heightField   = (EditText) findViewById( R.id.heightField   );
    final Button   optionsButton = (Button)   findViewById( R.id.optionsButton );
    final Button   showBigButton = (Button)   findViewById( R.id.showBigButton );
    
    
    velocityField.addTextChangedListener( new TextWatcherAdapter() {
      public void afterTextChanged( Editable e ) {
        computeAndShow( heightField, e.toString(), new ComputeCallback() {
          public double execute( String textInput ) throws NumberFormatException {
            double vKmh = Double.parseDouble( textInput );
            double vMps = Physics.kilometresPerHourToMetresPerSec( vKmh );
            return        Physics.computeEquivalentFallHeight( vMps );
          }
        });
      }
    });
    
    
    heightField.addTextChangedListener( new TextWatcherAdapter() {
      public void afterTextChanged( Editable e ) {
        computeAndShow( velocityField, e.toString(), new ComputeCallback() {
          public double execute( String textInput ) throws NumberFormatException {
            double height = Double.parseDouble( textInput );
            double vMps   = Physics.computeEquivalentVelocity( height );
            return          Physics.metresPerSecToKilometresPerHour( vMps );
          }
        });
      }
    });
    
    
    optionsButton.setOnClickListener( new OnClickListener() {
      public void onClick( View v ) {
        Intent intent = new Intent( ActivityFallHeight.this, ActivityOptions.class );
        intent.putExtra( Common.planetSelectIdentifier, Physics.getActivePlanet() );
        startActivityForResult( intent, planetRequestCode );
      }
    });
    
    
    showBigButton.setOnClickListener( new OnClickListener() {
      public void onClick( View v ) {
        Intent intent = new Intent( ActivityFallHeight.this, ActivityDisplay.class );
        intent.putExtra( Common.displayHeightIdentifier, heightField.getText().toString() );
        startActivity( intent );
      }
    });
  }
  
  
  
  
  
  private void updateDisplayedHeightFromVelocity() {
    final EditText velocityField = (EditText) findViewById( R.id.velocityField );
    velocityField.setText( velocityField.getText() ); // Triggers event.
  }
  
  
  
  
  
  private static String formatTwoDecimalPlaces( double num ) {
    DecimalFormat f = new DecimalFormat( "0.00" );
    return f.format( num );
  }
  
  
  
  
  
  private void showToastMessage( String str ) {
    Toast.makeText( this, str, Toast.LENGTH_SHORT ).show();
  }
}

Java Source Code List

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