Android example source code file (BitmapDecode.java)

This example Android source code file (BitmapDecode.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, bitmap, bitmapdecode, bytearrayoutputstream, drawable, drawing, graphics, graphicsactivity, io, movie, override, paint, sampleview, ui, view

The BitmapDecode.java Android example source code

/*
 * Copyright (C) 2007 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;

import com.example.android.apis.R;

import android.app.Activity;
import android.content.Context;
import android.graphics.*;
import android.graphics.drawable.*;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.*;

import java.io.IOException;
import java.io.InputStream;
import java.io.ByteArrayOutputStream;

public class BitmapDecode extends GraphicsActivity {
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(new SampleView(this));
    }
    
    private static class SampleView extends View {
        private Bitmap mBitmap;
        private Bitmap mBitmap2;
        private Bitmap mBitmap3;
        private Bitmap mBitmap4;
        private Drawable mDrawable;
        
        private Movie mMovie;
        private long mMovieStart;
        
        private static byte[] streamToBytes(InputStream is) {
            ByteArrayOutputStream os = new ByteArrayOutputStream(1024);
            byte[] buffer = new byte[1024];
            int len;
            try {
                while ((len = is.read(buffer)) >= 0) {
                    os.write(buffer, 0, len);
                }
            } catch (java.io.IOException e) {
            }
            return os.toByteArray();
        }
        
        public SampleView(Context context) {
            super(context);
            setFocusable(true);
            
            java.io.InputStream is;
            is = context.getResources().openRawResource(R.drawable.beach);
            
            BitmapFactory.Options opts = new BitmapFactory.Options();
            Bitmap bm;
            
            opts.inJustDecodeBounds = true;
            bm = BitmapFactory.decodeStream(is, null, opts);
            
            // now opts.outWidth and opts.outHeight are the dimension of the
            // bitmap, even though bm is null
            
            opts.inJustDecodeBounds = false;    // this will request the bm
            opts.inSampleSize = 4;             // scaled down by 4
            bm = BitmapFactory.decodeStream(is, null, opts);
            
            mBitmap = bm;
            
            // decode an image with transparency
            is = context.getResources().openRawResource(R.drawable.frog);
            mBitmap2 = BitmapFactory.decodeStream(is);
            
            // create a deep copy of it using getPixels() into different configs
            int w = mBitmap2.getWidth();
            int h = mBitmap2.getHeight();
            int[] pixels = new int[w*h];
            mBitmap2.getPixels(pixels, 0, w, 0, 0, w, h);
            mBitmap3 = Bitmap.createBitmap(pixels, 0, w, w, h,
                                           Bitmap.Config.ARGB_8888);
            mBitmap4 = Bitmap.createBitmap(pixels, 0, w, w, h,
                                           Bitmap.Config.ARGB_4444);
            
            mDrawable = context.getResources().getDrawable(R.drawable.button);
            mDrawable.setBounds(150, 20, 300, 100);
            
            is = context.getResources().openRawResource(R.drawable.animated_gif);
            if (true) {
                mMovie = Movie.decodeStream(is);
            } else {
                byte[] array = streamToBytes(is);
                mMovie = Movie.decodeByteArray(array, 0, array.length);
            }
        }
        
        @Override protected void onDraw(Canvas canvas) {
            canvas.drawColor(0xFFCCCCCC);            
            
            Paint p = new Paint();
            p.setAntiAlias(true);
            
            canvas.drawBitmap(mBitmap, 10, 10, null);
            canvas.drawBitmap(mBitmap2, 10, 170, null);
            canvas.drawBitmap(mBitmap3, 110, 170, null);
            canvas.drawBitmap(mBitmap4, 210, 170, null);
            
            mDrawable.draw(canvas);
            
            long now = android.os.SystemClock.uptimeMillis();
            if (mMovieStart == 0) {   // first time
                mMovieStart = now;
            }
            if (mMovie != null) {
                int dur = mMovie.duration();
                if (dur == 0) {
                    dur = 1000;
                }
                int relTime = (int)((now - mMovieStart) % dur);
                mMovie.setTime(relTime);
                mMovie.draw(canvas, getWidth() - mMovie.width(),
                            getHeight() - mMovie.height());
                invalidate();
            }
        }
    }
}