Android Open Source - ProgressButton Progress Button

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License

The source code is released under:

MIT License

Java Source Code

package com.sun.progressbutton;
//  w  ww  .  j a va2 s .c om
import com.example.progressbutton.R;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Align;
import android.graphics.Rect;
import android.graphics.drawable.Animatable;
import android.graphics.drawable.Drawable;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.widget.ImageButton;

public class ProgressButton extends ImageButton {

  private boolean _shouldDisplayLoadingAnimation = false;
  private Drawable _loadingAnimation;
  private TextPaint _textPaint;
  private Rect _textBounds;
  private String _defaultText;

  /**
   * {@link ProgressButton} can be used to display a simple rotating {@link Drawable} to give the user 
   * the effect of a loading button. The {@link Drawable} will be displayed once the user clicks the button and will have to be
   * manually dismissed using the {@link #stopLoadingAnimation()} method.
   * 
   * @param context_
   *       the current {@link Context}
   * @param attrs_
   *       the {@link AttributeSet} to retrieve data from compiled xml files
   * @param defStyle_
   *       the default style to apply
   */
  public ProgressButton(Context context_, AttributeSet attrs_, int defStyle_) {
    super(context_, attrs_, defStyle_);  
    
      final TypedArray a = context_.obtainStyledAttributes(attrs_, R.styleable.ProgressButton,
              R.attr.progressButtonStyle, R.style.ProgressButton_attrs);
    
      this.setBackgroundColor(a.getInteger(R.styleable.ProgressButton_defaultBackgroundColor, Color.WHITE));
      
    _loadingAnimation = getDrawable();
    _loadingAnimation.setAlpha(0);
    _defaultText = a.getString(R.styleable.ProgressButton_defaultText);
      _textPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG);
      _textPaint.density = getResources().getDisplayMetrics().density;
      
      _textPaint.setColor(a.getInteger(R.styleable.ProgressButton_defaultFontColor, Color.BLACK));
      _textPaint.setTextAlign(Align.CENTER);
      _textPaint.setTextSize(a.getInteger(R.styleable.ProgressButton_defaultFontSize, 40));
      _textPaint.setFakeBoldText(true);
      _textBounds = new Rect();
      
      a.recycle();
  }

  public ProgressButton(Context context_, AttributeSet attrs_) {
    this(context_, attrs_, 0);
  }

  public ProgressButton(Context context_) {
    this(context_, null);
  }

  /**
   * Ensures that the loading animation will be displayed when the user clicks the button
   */
  @Override
  public boolean performClick() {
    boolean isClicked = super.performClick();
    if (isClicked) {
      _shouldDisplayLoadingAnimation = true;
      this.invalidate();
    }

    return isClicked;
  };


  public void startLoadingAnimation() {
    _shouldDisplayLoadingAnimation = true;
    this.invalidate();
  }

  public void stopLoadingAnimation() {
    _shouldDisplayLoadingAnimation = false;
    this.invalidate();
  }

  /**
   * Display a loading animation if the user has clicked the button or hide it if {@link #stopLoadingAnimation()} 
   * has been called. 
   * 
   */
  @Override
  protected void onDraw(Canvas canvas_) {
    if (_shouldDisplayLoadingAnimation) {
        shouldShowAnimation(true);
    } else {
      _textPaint.getTextBounds(_defaultText, 0, _defaultText.length(), _textBounds);
      canvas_.drawText( _defaultText , getWidth()/2, (getHeight()/2)+((_textBounds.bottom-_textBounds.top)/2) , _textPaint);
      shouldShowAnimation(false);
      _loadingAnimation.setVisible(false, false);
    }
    super.onDraw(canvas_);

  }

  /**
   * Start or stop the current {@link Animatable} instance
   * 
   * @param shouldShow_
   *       to indicate whether {@link android.graphics.drawable.Animatable#stop()} or 
   *       {@link android.graphics.drawable.Animatable#start()} should be invoked on the current {@link Animatable} instance
   */
  private void shouldShowAnimation(boolean shouldShow_) {
    if (_loadingAnimation instanceof Animatable) {
      if (shouldShow_) {
        _loadingAnimation.setAlpha(255);
        ((Animatable) _loadingAnimation).start();
      } else {
        _loadingAnimation.setAlpha(0);
        ((Animatable) _loadingAnimation).stop();
      }
    }
  }

}

Java Source Code List

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