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RenderScriptIntrinsic / src / com.example.android.renderscriptintrinsic /

ThumbnailRadioButton.java

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/*
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 * Copyright (C) 2014 The Android Open Source Project
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *      http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.example.android.renderscriptintrinsic;
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import android.graphics.Bitmap;
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import android.graphics.Color;
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import android.graphics.Paint;
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import android.graphics.drawable.BitmapDrawable;
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import android.graphics.drawable.Drawable;
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import android.graphics.drawable.LayerDrawable;
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import android.graphics.drawable.ShapeDrawable;
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import android.graphics.drawable.StateListDrawable;
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import android.graphics.drawable.shapes.RectShape;
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import android.os.Build;
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import android.view.Gravity;
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import android.widget.RadioButton;
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import android.content.Context;
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import android.util.AttributeSet;
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/*
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 A button with Thumbnail which extends Radio Button.
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 The widget override a background drawable of Radio Button with a StateList Drawable.
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 Each state has a LayerDrawable with a Thumbnail image and a Focus rectangle.
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 It's using original Radio Buttons text as a label, because LayerDrawable showed some issues with Canvas.drawText().
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 */
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public class ThumbnailRadioButton extends RadioButton {
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    public ThumbnailRadioButton(Context context) {
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        super(context);
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        init();
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    }
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    public ThumbnailRadioButton(Context context, AttributeSet attrs) {
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        super(context, attrs);
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        init();
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    }
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    public ThumbnailRadioButton(Context context, AttributeSet attrs, int defStyle) {
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        super(context, attrs, defStyle);
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        init();
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    }
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    private void init() {
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        setButtonDrawable(android.R.color.transparent);
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    }
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    public void setThumbnail(Bitmap bitmap) {
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        //Bitmap drawable
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        BitmapDrawable bmp = new BitmapDrawable(getResources(), bitmap);
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        bmp.setGravity(Gravity.CENTER);
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        int strokeWidth = 24;
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        //Checked state
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        ShapeDrawable rectChecked = new ShapeDrawable(new RectShape());
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        rectChecked.getPaint().setColor(0xFFFFFFFF);
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        rectChecked.getPaint().setStyle(Paint.Style.STROKE);
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        rectChecked.getPaint().setStrokeWidth(strokeWidth);
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        rectChecked.setIntrinsicWidth(bitmap.getWidth() + strokeWidth);
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        rectChecked.setIntrinsicHeight(bitmap.getHeight() + strokeWidth);
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        Drawable drawableArray[] = new Drawable[]{bmp, rectChecked};
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        LayerDrawable layerChecked = new LayerDrawable(drawableArray);
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        //Unchecked state
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        ShapeDrawable rectUnchecked = new ShapeDrawable(new RectShape());
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        rectUnchecked.getPaint().setColor(0x0);
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        rectUnchecked.getPaint().setStyle(Paint.Style.STROKE);
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        rectUnchecked.getPaint().setStrokeWidth(strokeWidth);
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        rectUnchecked.setIntrinsicWidth(bitmap.getWidth() + strokeWidth);
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        rectUnchecked.setIntrinsicHeight(bitmap.getHeight() + strokeWidth);
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        Drawable drawableArray2[] = new Drawable[]{bmp, rectUnchecked};
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        LayerDrawable layerUnchecked = new LayerDrawable(drawableArray2);
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        //Statelist drawable
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        StateListDrawable states = new StateListDrawable();
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        states.addState(new int[]{android.R.attr.state_checked},
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                layerChecked);
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        states.addState(new int[]{},
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                layerUnchecked);
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        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN)
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            setBackground(states);
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        else
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            setBackgroundDrawable(states);
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        //Offset text to center/bottom of the checkbox
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        Paint paint = new Paint();
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        paint.setAntiAlias(true);
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        paint.setTextSize(getTextSize());
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        paint.setTypeface(getTypeface());
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        float w = paint.measureText(getText(), 0, getText().length());
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        setPadding(getPaddingLeft() + (int) ((bitmap.getWidth() - w) / 2.f + .5f),
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                getPaddingTop() + (int) (bitmap.getHeight() * 0.70),
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                getPaddingRight(),
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                getPaddingBottom());
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        setShadowLayer(5, 0, 0, Color.BLACK);
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    }
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}