BootstrapThumbnail.java

package com.beardedhen.androidbootstrap;

import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.hoollyzhang.hlib.R;

public class BootstrapThumbnail extends FrameLayout {
    private static final int DEFAULT_WIDTH = 150; //width of thumbnail when no width is given
    private static final int DEFAULT_HEIGHT = 150;//height of thumbnail when no height is given
    private static final int DEFAULT_MAX_PADDING = 8; //8dp is max padding size when padding isn't specified by user
    private static final int DEFAULT_MIN_PADDING = 4; //4dp

    private LinearLayout placeholder;
    private boolean roundedCorners = true;

    private enum ThumbnailTypes {
        ROUNDED(R.drawable.bthumbnail_container_rounded, R.drawable.bthumbnail_placeholder_default),
        SQUARE(R.drawable.bthumbnail_container_square, R.drawable.bthumbnail_placeholder_default);

        private final int containerDrawable;
        private final int placeholderDrawable;

        ThumbnailTypes(int containerDrawable, int placeholderDrawable) {
            this.containerDrawable = containerDrawable;
            this.placeholderDrawable = placeholderDrawable;
        }

        public static ThumbnailTypes getTypeFromBoolean(boolean roundedCorners) {
            return (roundedCorners) ? ROUNDED : SQUARE;
        }

        public int getContainerDrawable() {
            return containerDrawable;
        }

        public int getPlaceholderDrawable() {
            return placeholderDrawable;
        }
    }

    public BootstrapThumbnail(Context context) {
        super(context);
        initialise(null);
    }

    public BootstrapThumbnail(Context context, AttributeSet attrs) {
        super(context, attrs);
        initialise(attrs);
    }

    public BootstrapThumbnail(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        initialise(attrs);
    }

    private void initialise(AttributeSet attrs) {
        LayoutInflater inflater = LayoutInflater.from(getContext());

        TypedArray a = getContext().obtainStyledAttributes(attrs,
                R.styleable.BootstrapThumbnail);

        //defaults
        ThumbnailTypes type;
        String text = "";
        int imageDrawable = 0;
        float scale = getResources().getDisplayMetrics().density; //for padding
        int width = DEFAULT_WIDTH;
        int height = DEFAULT_HEIGHT;
        int padding = 0;
        int paddingDP = 0;

        try {
            if (a != null) {
                //attribute values
                width = (int) a.getDimension(R.styleable.BootstrapThumbnail_bt_width, 0);
                height = (int) a.getDimension(R.styleable.BootstrapThumbnail_bt_height, 0);

                if (a.getString(R.styleable.BootstrapThumbnail_bt_inside_padding) != null) {
                    paddingDP = (int) a.getDimension(R.styleable.BootstrapThumbnail_bt_inside_padding, 0);
                }
                else {
                    padding = (int) (((Math.sqrt(width * height)) / 100) * 2);
                    if (padding > DEFAULT_MAX_PADDING) {
                        padding = DEFAULT_MAX_PADDING;
                    }
                    if (padding < DEFAULT_MIN_PADDING) {
                        padding = DEFAULT_MIN_PADDING;
                    }

                    paddingDP = (int) (padding * scale + 0.5f); //container padding in DP
                }

                roundedCorners = a.getBoolean(R.styleable.BootstrapThumbnail_bt_roundedCorners, false);
                imageDrawable = a.getResourceId(R.styleable.BootstrapThumbnail_bt_image, 0);
            }
        } finally {
            if (a != null) {
                a.recycle();
            }
        }

        text = (int) (width / scale) + "x" + (int) (height / scale);
        View v = inflater.inflate(R.layout.bootstrap_thumbnail, this, false);

        //get layout items
        ViewGroup container = (ViewGroup) v.findViewById(R.id.container);
        placeholder = (LinearLayout) v.findViewById(R.id.placeholder);
        TextView dimensionsLabel = (TextView) v.findViewById(R.id.dimensionsLabel);

        //get the correct background type
        type = ThumbnailTypes.getTypeFromBoolean(roundedCorners);

        //apply the background type
        container.setBackgroundResource(type.getContainerDrawable());

        //if no image is provided by user
        if (imageDrawable == 0) {
            //set default grey placeholder background
            placeholder.setBackgroundResource(type.getPlaceholderDrawable());

            //set the text
            if (text.length() > 0) {
                dimensionsLabel.setText(text);
                dimensionsLabel.setVisibility(View.VISIBLE);
            }
        }
        else {
            //set background to user's provided image
            placeholder.setBackgroundResource(imageDrawable);

            //remove textview dimensions
            dimensionsLabel.setVisibility(View.GONE);
        }

        //placeholder padding
        int paddingP = (int) (((Math.sqrt(width * height)) / 100) * 4);

        //convert to DP
        int paddingDPP = (int) (paddingP * scale + 0.5f);//placeholder padding in DP

        container.setPadding(paddingDP, paddingDP, paddingDP, paddingDP);
        placeholder.setPadding(paddingDPP, paddingDPP, paddingDPP, paddingDPP);
        placeholder.setLayoutParams(new LinearLayout.LayoutParams(width, height));

        //set the font awesome icon typeface
        dimensionsLabel.setTypeface(FontAwesome.getFont(getContext()));

        this.setClickable(true);

        addView(v);
    }

    public void setImage(int drawable) {
        this.placeholder.setBackgroundResource(drawable);
        invalidate();
        requestLayout();
    }

}