MaterialTab.java

package com.mobidev.newsapp.materialtabhost;

/**
 * Created by lawrence on 2/23/15.
 */

import java.util.Locale;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

import com.mobidev.newsapp.R;


@SuppressLint({"InflateParams", "ClickableViewAccessibility"})
/**
 * A simple Tab with Material Design style
 * @author neokree
 *
 */
public class MaterialTab implements View.OnTouchListener {
    private final static int REVEAL_DURATION = 400;
    private final static int HIDE_DURATION = 500;
    private View completeView;
    private ImageView icon;
    private TextView text;
    private ImageView selector;
    private Resources res;
    private MaterialTabListener listener;
    private Drawable iconDrawable;
    private int textColor;
    private int iconColor;
    private int primaryColor;
    private int accentColor;
    private boolean active;
    private int position;
    private boolean hasIcon;
    private float density;
    private Point lastTouchedPoint;

    public MaterialTab(Context ctx, boolean hasIcon) {
        this.hasIcon = hasIcon;
        density = ctx.getResources().getDisplayMetrics().density;
        res = ctx.getResources();
        if (!hasIcon) {
            completeView = LayoutInflater.from(ctx).inflate(R.layout.tab, null);
            text = (TextView) completeView.findViewById(R.id.text);
        } else {
            completeView = LayoutInflater.from(ctx).inflate(R.layout.tab_icon, null);
            icon = (ImageView) completeView.findViewById(R.id.icon);
        }
        selector = (ImageView) completeView.findViewById(R.id.selector);

// set the listener
        completeView.setOnTouchListener(this);
        active = false;
        textColor = Color.WHITE; // default white text
        iconColor = Color.WHITE; // and icon
    }

    public void setAccentColor(int color) {
        this.accentColor = color;
        this.textColor = color;
        this.iconColor = color;
    }

    public void setPrimaryColor(int color) {
        this.primaryColor = color;

        completeView.setBackgroundColor(color);
    }

    public void setTextColor(int color) {
        textColor = color;
        if (text != null) {
            text.setTextColor(color);
        }
    }

    public void setIconColor(int color) {
        this.iconColor = color;
        if (this.icon != null)
            this.icon.setColorFilter(color);
    }

    public MaterialTab setText(CharSequence text) {
        if (hasIcon)
            throw new RuntimeException("You had setted tabs with icons, uses icons instead text");
        this.text.setText(text.toString().toUpperCase(Locale.US));
        return this;
    }

    public MaterialTab setIcon(Drawable icon) {
        if (!hasIcon)
            throw new RuntimeException("You had setted tabs without icons, uses text instead icons");
        iconDrawable = icon;
        this.icon.setImageDrawable(icon);
        this.setIconColor(this.iconColor);
        return this;
    }

    public void disableTab() {
// set 60% alpha to text color
        if (text != null)
            this.text.setTextColor(Color.argb(0x99, Color.red(textColor), Color.green(textColor), Color.blue(textColor)));
// set 60% alpha to icon
        if (icon != null)
            setIconAlpha(0x99);
// set transparent the selector view
        this.selector.setBackgroundColor(res.getColor(android.R.color.transparent));
        active = false;
        if (listener != null)
            listener.onTabUnselected(this);
    }

    public void activateTab() {
// set full color text
        if (text != null)
            this.text.setTextColor(textColor);
// set 100% alpha to icon
        if (icon != null)
            setIconAlpha(0xFF);
// set accent color to selector view
        this.selector.setBackgroundColor(accentColor);
        active = true;
    }

    public boolean isSelected() {
        return active;
    }

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        lastTouchedPoint = new Point();
        lastTouchedPoint.x = (int) event.getX();
        lastTouchedPoint.y = (int) event.getY();
        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            completeView.setBackgroundColor(Color.argb(0x80, Color.red(accentColor), Color.green(accentColor), Color.blue(accentColor)));
// do nothing
            return true;
        }
        if (event.getAction() == MotionEvent.ACTION_CANCEL) {
            completeView.setBackgroundColor(primaryColor);
            return true;
        }
// new effects
        if (event.getAction() == MotionEvent.ACTION_UP) {
            completeView.setBackgroundColor(primaryColor);
// set the click
            if (listener != null) {
                if (active) {
// if the tab is active when the user click on it it will be reselect
                    listener.onTabReselected(this);
                } else {
                    listener.onTabSelected(this);
                }
            }
// if the tab is not activated, it will be active
            if (!active)
                this.activateTab();
            return true;
        }
        return false;
    }

    public View getView() {
        return completeView;
    }

    public MaterialTab setTabListener(MaterialTabListener listener) {
        this.listener = listener;
        return this;
    }

    public MaterialTabListener getTabListener() {
        return listener;
    }

    public int getPosition() {
        return position;
    }

    public void setPosition(int position) {
        this.position = position;
    }

    @SuppressLint({"NewApi"})
    private void setIconAlpha(int paramInt) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
            this.icon.setImageAlpha(paramInt);
            return;
        }
        this.icon.setColorFilter(Color.argb(paramInt, Color.red(this.iconColor), Color.green(this.iconColor), Color.blue(this.iconColor)));
    }

    private int getTextLenght() {
        String textString = text.getText().toString();
        Rect bounds = new Rect();
        Paint textPaint = text.getPaint();
        textPaint.getTextBounds(textString, 0, textString.length(), bounds);
        return bounds.width();
    }


    private int getIconWidth() {
        return (int) (density * 24);
    }

    public int getTabMinWidth() {
        if (hasIcon) {
            return getIconWidth();
        } else {
            return getTextLenght();
        }
    }
}