GIFView gif = new GIFView(LoadUI.this, R.drawable.progress);
((RelativeLayout) findViewById(R.id.progress)).addView(gif);
GIFView.java
package src.com.android.weather.util;
import java.io.InputStream;
import android.content.Context;
import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Paint;import android.view.View;public class GIFView extends View implements Runnable {
private Bitmap bmb; private GIFDecode decode;public GIFView(Context context, int img) {
super(context); decode = new GIFDecode(); InputStream in = this.getResources().openRawResource(img); decode.read(in); bmb = decode.getFrame(0); Thread t = new Thread(this); t.start(); }@Override
protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub super.onDraw(canvas); canvas.drawBitmap(bmb, 0, 0, new Paint()); bmb = decode.next(); }@Override
public void run() { // TODO Auto-generated method stub while(true){ try { this.postInvalidate(); Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } }}
}
GIFDecode.java
package src.com.android.weather.util;
import java.io.InputStream;
import java.util.Vector;import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;public class GIFDecode {
public static final int STATUS_OK = 0;
public static final int STATUS_FORMAT_ERROR = 1; public static final int STATUS_OPEN_ERROR = 2;protected InputStream in;
protected int status;protected int width; // full image width
protected int height; // full image height protected boolean gctFlag; // global color table used protected int gctSize; // size of global color table protected int loopCount = 1; // iterations; 0 = repeat foreverprotected int[] gct; // global color table
protected int[] lct; // local color table protected int[] act; // active color tableprotected int bgIndex; // background color index
protected int bgColor; // background color protected int lastBgColor; // previous bg color protected int pixelAspect; // pixel aspect ratioprotected boolean lctFlag; // local color table flag
protected boolean interlace; // interlace flag protected int lctSize; // local color table sizeprotected int ix, iy, iw, ih; // current image rectangle
protected int lrx, lry, lrw, lrh; protected Bitmap image; // current frame protected Bitmap lastImage; // previous frame protected int frameindex = 0;public int getFrameindex() {
return frameindex; }public void setFrameindex(int frameindex) {
this.frameindex = frameindex; if (frameindex > frames.size() - 1) { frameindex = 0; } }protected byte[] block = new byte[256]; // current data block
protected int blockSize = 0; // block size// last graphic control extension info
protected int dispose = 0; // 0=no action; 1=leave in place; 2=restore to bg; 3=restore to prev protected int lastDispose = 0; protected boolean transparency = false; // use transparent color protected int delay = 0; // delay in milliseconds protected int transIndex; // transparent color indexprotected static final int MaxStackSize = 4096;
// max decoder pixel stack size// LZW decoder working arrays
protected short[] prefix; protected byte[] suffix; protected byte[] pixelStack; protected byte[] pixels;@SuppressWarnings("unchecked")
protected Vector frames; // frames read from current file protected int frameCount;static class GifFrame {
public Bitmap image;
public int delay;public GifFrame(Bitmap im, int del) {
image = im; delay = del; } }/**
* Gets display duration for specified frame. * */ public int getDelay(int n) { delay = -1; if ((n >= 0) && (n < frameCount)) { delay = ((GifFrame) frames.elementAt(n)).delay; } return delay; }public int getFrameCount() {
return frameCount; }public Bitmap getImage() {
return getFrame(0); }public int getLoopCount() {
return loopCount; }public void setPixels() {
int[] dest = new int[width * height]; // fill in starting image contents based on last image's dispose code if (lastDispose > 0) { if (lastDispose == 3) { // use image before last int n = frameCount - 2; if (n > 0) { lastImage = getFrame(n - 1); } else { lastImage = null; } }if (lastImage != null) {
lastImage.getPixels(dest, 0, width, 0, 0, width, height); // copy pixels if (lastDispose == 2) { // fill last image rect area with background color int c = 0; if (!transparency) { c = lastBgColor; } for (int i = 0; i < lrh; i++) { int n1 = (lry + i) * width + lrx; int n2 = n1 + lrw; for (int k = n1; k < n2; k++) { dest[k] = c; } } } } }// copy each source line to the appropriate place in the destination
int pass = 1; int inc = 8; int iline = 0; for (int i = 0; i < ih; i++) { int line = i; if (interlace) { if (iline >= ih) { pass++; switch (pass) { case 2: iline = 4; break; case 3: iline = 2; inc = 4; break; case 4: iline = 1; inc = 2; } } line = iline; iline += inc; } line += iy; if (line < height) { int k = line * width; int dx = k + ix; // start of line in dest int dlim = dx + iw; // end of dest line if ((k + width) < dlim) { dlim = k + width; // past dest edge } int sx = i * iw; // start of line in source while (dx < dlim) { // map color and insert in destination int index = ((int) pixels[sx++]) & 0xff; int c = act[index]; if (c != 0) { dest[dx] = c; } dx++; } } } image = Bitmap.createBitmap(dest, width, height, Config.RGB_565); }public Bitmap getFrame(int n) {
Bitmap im = null; if ((n >= 0) && (n < frameCount)) { im = ((GifFrame) frames.elementAt(n)).image; } return im; }public Bitmap next() {
frameindex++; if (frameindex > frames.size() - 1) { frameindex = 0; } return ((GifFrame) frames.elementAt(frameindex)).image; }public int read(InputStream is) {
init(); if (is != null) { in = is; readHeader(); if (!err()) { readContents(); if (frameCount < 0) { status = STATUS_FORMAT_ERROR; } } } else { status = STATUS_OPEN_ERROR; } try { is.close(); } catch (Exception e) { e.printStackTrace(); } return status; }protected void decodeImageData() {
int NullCode = -1; int npix = iw * ih; int available, clear, code_mask, code_size, end_of_information, in_code, old_code, bits, code, count, i, datum, data_size, first, top, bi, pi;if ((pixels == null) || (pixels.length < npix)) {
pixels = new byte[npix]; // allocate new pixel array } if (prefix == null) { prefix = new short[MaxStackSize]; } if (suffix == null) { suffix = new byte[MaxStackSize]; } if (pixelStack == null) { pixelStack = new byte[MaxStackSize + 1]; } // Initialize GIF data stream decoder. data_size = read(); clear = 1 << data_size; end_of_information = clear + 1; available = clear + 2; old_code = NullCode; code_size = data_size + 1; code_mask = (1 << code_size) - 1; for (code = 0; code < clear; code++) { prefix[code] = 0; suffix[code] = (byte) code; }// Decode GIF pixel stream.
datum = bits = count = first = top = pi = bi = 0; for (i = 0; i < npix;) { if (top == 0) { if (bits < code_size) { // Load bytes until there are enough bits for a code. if (count == 0) { // Read a new data block. count = readBlock(); if (count <= 0) { break; } bi = 0; } datum += (((int) block[bi]) & 0xff) << bits; bits += 8; bi++; count--; continue; } // Get the next code. code = datum & code_mask; datum >>= code_size; bits -= code_size;// Interpret the code
if ((code > available) || (code == end_of_information)) { break; } if (code == clear) { // Reset decoder. code_size = data_size + 1; code_mask = (1 << code_size) - 1; available = clear + 2; old_code = NullCode; continue; } if (old_code == NullCode) { pixelStack[top++] = suffix[code]; old_code = code; first = code; continue; } in_code = code; if (code == available) { pixelStack[top++] = (byte) first; code = old_code; } while (code > clear) { pixelStack[top++] = suffix[code]; code = prefix[code]; } first = ((int) suffix[code]) & 0xff; // Add a new string to the string table, if (available >= MaxStackSize) { break; } pixelStack[top++] = (byte) first; prefix[available] = (short) old_code; suffix[available] = (byte) first; available++; if (((available & code_mask) == 0) && (available < MaxStackSize)) { code_size++; code_mask += available; } old_code = in_code; }// Pop a pixel off the pixel stack.
top--; pixels[pi++] = pixelStack[top]; i++; } for (i = pi; i < npix; i++) { pixels[i] = 0; // clear missing pixels } }protected boolean err() {
return status != STATUS_OK; }protected void init() {
status = STATUS_OK; frameCount = 0; frames = new Vector(); gct = null; lct = null; }protected int read() {
int curByte = 0; try { curByte = in.read(); } catch (Exception e) { status = STATUS_FORMAT_ERROR; } return curByte; }protected int readBlock() {
blockSize = read(); int n = 0; if (blockSize > 0) { try { int count = 0; while (n < blockSize) { count = in.read(block, n, blockSize - n); if (count == -1) { break; } n += count; } } catch (Exception e) { e.printStackTrace(); } if (n < blockSize) { status = STATUS_FORMAT_ERROR; } } return n; }protected int[] readColorTable(int ncolors) {
int nbytes = 3 * ncolors; int[] tab = null; byte[] c = new byte[nbytes]; int n = 0; try { n = in.read(c); } catch (Exception e) { e.printStackTrace(); } if (n < nbytes) { status = STATUS_FORMAT_ERROR; } else { tab = new int[256]; // max size to avoid bounds checks int i = 0; int j = 0; while (i < ncolors) { int r = ((int) c[j++]) & 0xff; int g = ((int) c[j++]) & 0xff; int b = ((int) c[j++]) & 0xff; tab[i++] = 0xff000000 | (r << 16) | (g << 8) | b; } } return tab; }protected void readContents() {
// read GIF file content blocks boolean done = false; while (!(done || err())) { int code = read(); switch (code) { case 0x2C: // image separator readImage(); break; case 0x21: // extension code = read(); switch (code) { case 0xf9: // graphics control extension readGraphicControlExt(); break; case 0xff: // application extension readBlock(); String app = ""; for (int i = 0; i < 11; i++) { app += (char) block[i]; } if (app.equals("NETSCAPE2.0")) { readNetscapeExt(); } else { skip(); // don't care } break; default: // uninteresting extension skip(); } break; case 0x3b: // terminator done = true; break; case 0x00: // bad byte, but keep going and see what happens break; default: status = STATUS_FORMAT_ERROR; } } }protected void readGraphicControlExt() {
read(); // block size int packed = read(); // packed fields dispose = (packed & 0x1c) >> 2; // disposal method if (dispose == 0) { dispose = 1; // elect to keep old image if discretionary } transparency = (packed & 1) != 0; delay = readShort() * 10; // delay in milliseconds transIndex = read(); // transparent color index read(); // block terminator }protected void readHeader() {
String id = ""; for (int i = 0; i < 6; i++) { id += (char) read(); } if (!id.startsWith("GIF")) { status = STATUS_FORMAT_ERROR; return; } readLSD(); if (gctFlag && !err()) { gct = readColorTable(gctSize); bgColor = gct[bgIndex]; } }protected void readImage() {
ix = readShort(); // (sub)image position & size iy = readShort(); iw = readShort(); ih = readShort(); int packed = read(); lctFlag = (packed & 0x80) != 0; // 1 - local color table flag interlace = (packed & 0x40) != 0; // 2 - interlace flag // 3 - sort flag // 4-5 - reserved lctSize = 2 << (packed & 7); // 6-8 - local color table size if (lctFlag) { lct = readColorTable(lctSize); // read table act = lct; // make local table active } else { act = gct; // make global table active if (bgIndex == transIndex) { bgColor = 0; } } int save = 0; if (transparency) { save = act[transIndex]; act[transIndex] = 0; // set transparent color if specified } if (act == null) { status = STATUS_FORMAT_ERROR; // no color table defined } if (err()) { return; } decodeImageData(); // decode pixel data skip(); if (err()) { return; } frameCount++; // create new image to receive frame data image = Bitmap.createBitmap(width, height, Config.RGB_565); // createImage(width, height); setPixels(); // transfer pixel data to image frames.addElement(new GifFrame(image, delay)); // add image to frame // list if (transparency) { act[transIndex] = save; } resetFrame(); }protected void readLSD() {
// logical screen size width = readShort(); height = readShort(); // packed fields int packed = read(); gctFlag = (packed & 0x80) != 0; // 1 : global color table flag // 2-4 : color resolution // 5 : gct sort flag gctSize = 2 << (packed & 7); // 6-8 : gct size bgIndex = read(); // background color index pixelAspect = read(); // pixel aspect ratio }protected void readNetscapeExt() {
do { readBlock(); if (block[0] == 1) { // loop count sub-block int b1 = ((int) block[1]) & 0xff; int b2 = ((int) block[2]) & 0xff; loopCount = (b2 << 8) | b1; } } while ((blockSize > 0) && !err()); }protected int readShort() {
// read 16-bit value, LSB first return read() | (read() << 8); }protected void resetFrame() {
lastDispose = dispose; lrx = ix; lry = iy; lrw = iw; lrh = ih; lastImage = image; lastBgColor = bgColor; dispose = 0; transparency = false; delay = 0; lct = null; }/**
* Skips variable length blocks up to and including next zero length block. */ protected void skip() { do { readBlock(); } while ((blockSize > 0) && !err()); }}