Api Demo - .graphics(10)

/*
 * 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.example.android.apis.graphics;

//Need the following import to get access to the app resources, since this
//class is in a sub-package.
import com.example.android.apis.R;

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.LayoutInflater;
import android.view.View;
import android.content.Context;
import android.util.DisplayMetrics;
import android.util.Log;

/**
 * This activity demonstrates various ways density can cause the scaling of
 * bitmaps and drawables.
 */
public class DensityActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        final LayoutInflater li = (LayoutInflater)getSystemService(
                LAYOUT_INFLATER_SERVICE);//     
        
        this.setTitle(R.string.density_title);
        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 = (LinearLayout)li.inflate(R.layout.density_image_views, null);// XML      
        addLabelToRoot(root, "Inflated layout");
        addChildToRoot(root, layout);
        
        layout = (LinearLayout)li.inflate(R.layout.density_styled_image_views, null);// XML      ，    style    
        addLabelToRoot(root, "Inflated styled layout");
        addChildToRoot(root, layout);
        
        
        /*
         * Android                            
         * drawable          ，   drawable   ， 
         * drawable-hdpi          drawable  drawable-hdpi          drawable-ldpi    。
         *   values                。
         *           Bitmap    (.png. .jpg, .gif ,.9.png)
         *         3:4:6:8                   ，
         *       “    ”      48X48   ，
         * Low-density:  36X36
         * Medium-density: 48X48
         * High-density: 72X72
         * Extra high-density: 96X96
         *                          ，      ，         ，    
         *        drawable,                  ，                      。
         *          160，        drawable-ldpi,       。    drawable-hdpi     。
         *                 ：
         *          drawable-nodpi    ，
         *      opts.inScaled = false。
         */
        
        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, true);
        addCanvasBitmap(layout, R.drawable.logo160dpi, true);
        addCanvasBitmap(layout, R.drawable.logo240dpi, true);
        addLabelToRoot(root, "Autoscaled bitmap");
        addChildToRoot(root, layout);

        layout = new LinearLayout(this);
        addResourceDrawable(layout, R.drawable.logonodpi120);
        addResourceDrawable(layout, R.drawable.logonodpi160);
        addResourceDrawable(layout, R.drawable.logonodpi240);
        addLabelToRoot(root, "No-dpi resource drawable");
        addChildToRoot(root, layout);

        layout = new LinearLayout(this);
        addNinePatchResourceDrawable(layout, R.drawable.smlnpatch120dpi);
        addNinePatchResourceDrawable(layout, R.drawable.smlnpatch160dpi);
        addNinePatchResourceDrawable(layout, R.drawable.smlnpatch240dpi);
        addLabelToRoot(root, "Prescaled 9-patch resource drawable");
        addChildToRoot(root, layout);

        setContentView(scrollWrap(root));
    }

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

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

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

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

        View view = new View(this);

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

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

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

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

        Log.i("foo", "9-patch #" + Integer.toHexString(resource)// 16       。
                + " w=" + d.getIntrinsicWidth() + " h=" + d.getIntrinsicHeight());
        view.setLayoutParams(new LinearLayout.LayoutParams(
                d.getIntrinsicWidth()*2, d.getIntrinsicHeight()*2));
        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 {//   View,  onMeasure， Bitmap     
        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);
            final DisplayMetrics metrics = getResources().getDisplayMetrics();
            setMeasuredDimension(//      
                    mBitmap.getScaledWidth(metrics),//  DisplayMetrics         ；
                    mBitmap.getScaledHeight(metrics));
        }
       



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

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