对话框的多选

最新推荐文章于 2022-11-04 11:51:20 发布

iteye_15461

最新推荐文章于 2022-11-04 11:51:20 发布

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分类专栏：指导篇文章标签： java

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本文展示了一个Android应用中实现的多选对话框示例，该对话框允许用户从一系列选项（例如行星名称）中进行选择，并记录用户的选取结果。

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public class MultiSelectionDialogExample extends Activity
{
protected CharSequence[] _options = { "Mercury", "Venus", "Earth", "Mars", "Jupiter", "Saturn", "Uranus", "Neptune" };
protected boolean[] _selections = new boolean[ _options.length ];

protected Button _optionsButton;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        _optionsButton = ( Button ) findViewById( R.id.button );
        _optionsButton.setOnClickListener( new ButtonClickHandler() );
    }

    public class ButtonClickHandler implements View.OnClickListener {
  public void onClick( View view ) {
   showDialog( 0 );
  }
}

@Override
protected Dialog onCreateDialog( int id )
{
  return
  new AlertDialog.Builder( this )
        .setTitle( "Planets" )
        .setMultiChoiceItems( _options, _selections, new DialogSelectionClickHandler() )
        .setPositiveButton( "OK", new DialogButtonClickHandler() )
        .create();
}

public class DialogSelectionClickHandler implements DialogInterface.OnMultiChoiceClickListener
{
  public void onClick( DialogInterface dialog, int clicked, boolean selected )
  {
   Log.i( "ME", _options[ clicked ] + " selected: " + selected );
  }
}

public class DialogButtonClickHandler implements DialogInterface.OnClickListener
{
  public void onClick( DialogInterface dialog, int clicked )
  {
   switch( clicked )
   {
    case DialogInterface.BUTTON_POSITIVE:
     printSelectedPlanets();
     break;
   }
  }
}

protected void printSelectedPlanets(){
  for( int i = 0; i < _options.length; i++ ){
   Log.i( "ME", _options[ i ] + " selected: " + _selections[i] );
  }
}
}