tests/DpiTest/src/com/google/android/test/dpi/DpiTestActivity.java

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.android.test.dpi;

import android.app.Activity;
import android.os.Bundle;
import android.graphics.BitmapFactory;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.ScrollView;
import android.view.View;
import android.content.Context;

public class DpiTestActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        LinearLayout root = new LinearLayout(this);
        root.setOrientation(LinearLayout.VERTICAL);

        LinearLayout layout = new LinearLayout(this);
        addBitmapDrawable(layout, R.drawable.logo120dpi, true);
        addBitmapDrawable(layout, R.drawable.logo160dpi, true);
        addBitmapDrawable(layout, R.drawable.logo240dpi, true);
        addLabelToRoot(root, "Prescaled bitmap in drawable");
        addChildToRoot(root, layout);

        layout = new LinearLayout(this);
        addBitmapDrawable(layout, R.drawable.logo120dpi, false);
        addBitmapDrawable(layout, R.drawable.logo160dpi, false);
        addBitmapDrawable(layout, R.drawable.logo240dpi, false);
        addLabelToRoot(root, "Autoscaled bitmap in drawable");
        addChildToRoot(root, layout);

        layout = new LinearLayout(this);
        addResourceDrawable(layout, R.drawable.logo120dpi);
        addResourceDrawable(layout, R.drawable.logo160dpi);
        addResourceDrawable(layout, R.drawable.logo240dpi);
        addLabelToRoot(root, "Prescaled resource drawable");
        addChildToRoot(root, layout);

        layout = new LinearLayout(this);
        addCanvasBitmap(layout, R.drawable.logo120dpi, true);
        addCanvasBitmap(layout, R.drawable.logo160dpi, true);
        addCanvasBitmap(layout, R.drawable.logo240dpi, true);
        addLabelToRoot(root, "Prescaled bitmap");
        addChildToRoot(root, layout);

        layout = new LinearLayout(this);
        addCanvasBitmap(layout, R.drawable.logo120dpi, false);
        addCanvasBitmap(layout, R.drawable.logo160dpi, false);
        addCanvasBitmap(layout, R.drawable.logo240dpi, false);
        addLabelToRoot(root, "Autoscaled bitmap");
        addChildToRoot(root, layout);

        setContentView(scrollWrap(root));
    }

    private View scrollWrap(View view) {
        ScrollView scroller = new ScrollView(this);
        scroller.addView(view, new ScrollView.LayoutParams(ScrollView.LayoutParams.FILL_PARENT,
                ScrollView.LayoutParams.FILL_PARENT));
        return scroller;
    }

    private void addLabelToRoot(LinearLayout root, String text) {
        TextView label = new TextView(this);
        label.setText(text);
        root.addView(label, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT,
                LinearLayout.LayoutParams.WRAP_CONTENT));
    }

    private void addChildToRoot(LinearLayout root, LinearLayout layout) {
        root.addView(layout, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT,
                LinearLayout.LayoutParams.WRAP_CONTENT));
    }

    private void addBitmapDrawable(LinearLayout layout, int resource, boolean scale) {
        Bitmap bitmap;
        bitmap = loadAndPrintDpi(resource, scale);

        View view = new View(this);

        final BitmapDrawable d = new BitmapDrawable(bitmap);
        if (!scale) d.setDensityScale(getResources().getDisplayMetrics());
        view.setBackgroundDrawable(d);

        view.setLayoutParams(new LinearLayout.LayoutParams(d.getIntrinsicWidth(),
                d.getIntrinsicHeight()));
        layout.addView(view);
    }

    private void addResourceDrawable(LinearLayout layout, int resource) {
        View view = new View(this);

        final Drawable d = getResources().getDrawable(resource);
        view.setBackgroundDrawable(d);

        view.setLayoutParams(new LinearLayout.LayoutParams(d.getIntrinsicWidth(),
                d.getIntrinsicHeight()));
        layout.addView(view);
    }

    private void addCanvasBitmap(LinearLayout layout, int resource, boolean scale) {
        Bitmap bitmap;
        bitmap = loadAndPrintDpi(resource, scale);

        ScaledBitmapView view = new ScaledBitmapView(this, bitmap);

        view.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
                LinearLayout.LayoutParams.WRAP_CONTENT));
        layout.addView(view);
    }

    private Bitmap loadAndPrintDpi(int id, boolean scale) {
        Bitmap bitmap;
        if (scale) {
            bitmap = BitmapFactory.decodeResource(getResources(), id);
        } else {
            BitmapFactory.Options opts = new BitmapFactory.Options();
            opts.inScaled = false;
            bitmap = BitmapFactory.decodeResource(getResources(), id, opts);
        }
        return bitmap;
    }

    private class ScaledBitmapView extends View {
        private Bitmap mBitmap;

        public ScaledBitmapView(Context context, Bitmap bitmap) {
            super(context);
            mBitmap = bitmap;
        }

        @Override
        protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
            setMeasuredDimension(mBitmap.getScaledWidth(), mBitmap.getScaledHeight());
        }

        @Override
        protected void onDraw(Canvas canvas) {
            super.onDraw(canvas);

            canvas.drawBitmap(mBitmap, 0.0f, 0.0f, null);
        }
    }
}