Android Open Source - QCircle-Design-Template Q Circle Back Button

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License

The source code is released under:

QCircle Design Template Library Project Contributor License Agreement By making a contribution to this QCircle Design Template Library Project (??Project??), I accept and agree to the following term...

Java Source Code

package com.lge.qcircle.template;
//from w w w  . j a v  a 2 s  .  c  o  m
import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
import android.widget.RelativeLayout;

/**
 * The {@code QCircleBackButton} class represents back buttons of QuickCircle.
 *
 * @author jeongeun.jeon
 */
public final class QCircleBackButton {
  private final String TAG = "QCircleBackButton";
  private OnClickListener mListener;
  private ImageView mBtnContent = null;
  private int    mButtonHeight = 0;
  private Context mContext = null;
  private boolean isDark = false;
  
  private static float PADDING_RATIO = 0.35f;

  /**
   * creates a back button.
   *
   * @param context {@code Activity} which has a circle view.<br>
   * <b>If it is null, you might get errors when you use method of this class.</b>
   */
  public QCircleBackButton(Context context, int height) {
    this(context, height, null);
  }

  /**
   * creates a back button.
   *
   * @param context {@code Activity} which has a circle view.<br>
   * <b>If it is null, you might get errors when you use method of this class.</b>
   * @param listener Listener on click
   */
  public QCircleBackButton(Context context, int height, OnClickListener listener) {
    mContext = context;
    mListener = listener;
    mButtonHeight = height;
    if (!setButton())
      Log.d(TAG, "Cannot create a button. Context is null.");
  }

  /**
   * sets the layout of the button.
   *
   * @return true if a button is configured successfully or
   * false otherwise.
   */
  private boolean setButton() {
    boolean result = false;
    if (mContext != null) {
      mBtnContent = new ImageView(mContext);
      mBtnContent.setPadding(0,(int)(mButtonHeight*PADDING_RATIO), 0, (int)(mButtonHeight*PADDING_RATIO));
      
      // set attributes
      mBtnContent.setId(R.id.backButton);
      setTheme();
      mBtnContent.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
          if (mListener != null) mListener.onClick(v);
          if (mContext != null) {
            try {
              ((Activity) mContext).finish();
            } catch (ClassCastException e) {
              Log.e(TAG, "Cannot finish the Application: the context is not an Activity.");
            }
          }
        }
      });
      result = true;
    }
    return result;
  }

    /**
     * sets theme of the back button.
     * @author Yoav Sternberg
     */
  private void setTheme() {
    mBtnContent.setImageResource(isDark ? R.drawable.backover_dark : R.drawable.backover);
    mBtnContent.setBackgroundResource(isDark ? R.drawable.back_button_background_dark : R.drawable.back_button_background);
  }

    /**
     * uses dark theme for the back button.<P>
     *
     * @param isDark  flag which indicates whether dark theme is used or not.
     * @author Yoav Sternberg
     */
  public void isDark(boolean isDark) {
    this.isDark = isDark;
    setTheme();
  }

  /**
   * gets the view of the button.
   *
   * @return button view
   */
  public View getView() {
    return mBtnContent;
  }

  /**
   * gets the ID of the button view.
   *
   * @return ID of the button view
   */
  public static int getId() {
    return R.id.backButton;
  }

  /**
   * sets the background of the button transparent.
   */
  public void setBackgroundTransparent() {
    if (mBtnContent != null)
      mBtnContent.setBackgroundResource(R.drawable.back_button_background_semi_transparent);
  }
}

Java Source Code List

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