这对我来说就像魅力一样：
GifView.java
package com.example.demo;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.View;
import android.widget.LinearLayout.LayoutParams;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
public class GifView extends View {
public static final int IMAGE_TYPE_UNKNOWN = 0;
public static final int IMAGE_TYPE_STATIC = 1;
public static final int IMAGE_TYPE_DYNAMIC = 2;
public static final int DECODE_STATUS_UNDECODE = 0;
public static final int DECODE_STATUS_DECODING = 1;
public static final int DECODE_STATUS_DECODED = 2;
private GifDecoder decoder;
private Bitmap bitmap;
public int imageType = IMAGE_TYPE_UNKNOWN;
public int decodeStatus = DECODE_STATUS_UNDECODE;
private int width;
private int height;
private long time;
private int index;
private int resId;
private String filePath;
private boolean playFlag = false;
int gifImageResourceID;
public GifView(Context context, AttributeSet attrs) {
super(context, attrs);
String namespace = "http://schemas.android.com/apk/res/" + context.getPackageName();
gifImageResourceID = attrs.getAttributeResourceValue(namespace, "gif_image", 0);
if (gifImageResourceID != 0) {
setGifImageResourceID(gifImageResourceID);
}
}
/**
* Constructor
*/
public GifView(Context context) {
super(context);
}
private InputStream getInputStream() {
if (filePath != null)
try {
return new FileInputStream(filePath);
} catch (FileNotFoundException e) {
}
if (resId > 0)
return getContext().getResources().openRawResource(resId);
return null;
}
/**
* set gif file path
*
* @param filePath
*/
public void setGif(String filePath) {
Bitmap bitmap = BitmapFactory.decodeFile(filePath);
setGif(filePath, bitmap);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if (bitmap != null) {
setMeasuredDimension(MeasureSpec.getSize(bitmap.getWidth()), MeasureSpec.getSize(bitmap.getHeight()));
}
}
/**
* set gif file path and cache image
*
* @param filePath
* @param cacheImage
*/
public void setGif(String filePath, Bitmap cacheImage) {
this.resId = 0;
this.filePath = filePath;
imageType = IMAGE_TYPE_UNKNOWN;
decodeStatus = DECODE_STATUS_UNDECODE;
playFlag = false;
bitmap = cacheImage;
width = bitmap.getWidth();
height = bitmap.getHeight();
android.view.ViewGroup.LayoutParams params = getLayoutParams();
params.width = width;
params.height = height;
setLayoutParams(params);
play();
}
/**
* set gif resource id
*
* @param resId
*/
public void setGifImageResourceID(int resId) {
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), resId);
setGif(resId, bitmap);
}
/**
* set gif resource id and cache image
*
* @param resId
* @param cacheImage
*/
public void setGif(int resId, Bitmap cacheImage) {
this.filePath = null;
this.resId = resId;
imageType = IMAGE_TYPE_UNKNOWN;
decodeStatus = DECODE_STATUS_UNDECODE;
playFlag = false;
bitmap = cacheImage;
width = bitmap.getWidth();
height = bitmap.getHeight();
setLayoutParams(new LayoutParams(width, height));
play();
}
private void decode() {
release();
index = 0;
decodeStatus = DECODE_STATUS_DECODING;
new Thread() {
@Override
public void run() {
decoder = new GifDecoder();
decoder.read(getInputStream());
if (decoder.width == 0 || decoder.height == 0) {
imageType = IMAGE_TYPE_STATIC;
} else {
imageType = IMAGE_TYPE_DYNAMIC;
}
postInvalidate();
time = System.currentTimeMillis();
decodeStatus = DECODE_STATUS_DECODED;
}
}.start();
}
public void release() {
decoder = null;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (decodeStatus == DECODE_STATUS_UNDECODE) {
canvas.drawBitmap(bitmap, (getWidth()-width)/2, (getHeight()-height)/2, null);
if (playFlag) {
decode();
invalidate();
}
} else if (decodeStatus == DECODE_STATUS_DECODING) {
canvas.drawBitmap(bitmap, (getWidth()-width)/2, (getHeight()-height)/2, null);
invalidate();
} else if (decodeStatus == DECODE_STATUS_DECODED) {
if (imageType == IMAGE_TYPE_STATIC) {
canvas.drawBitmap(bitmap, (getWidth()-width)/2, (getHeight()-height)/2, null);
} else if (imageType == IMAGE_TYPE_DYNAMIC) {
if (playFlag) {
long now = System.currentTimeMillis();
if (time + decoder.getDelay(index) < now) {
time += decoder.getDelay(index);
incrementFrameIndex();
}
Bitmap bitmap = decoder.getFrame(index);
if (bitmap != null) {
canvas.drawBitmap(bitmap, (getWidth()-width)/2, (getHeight()-height)/2, null);
}
invalidate();
} else {
Bitmap bitmap = decoder.getFrame(index);
canvas.drawBitmap(bitmap, (getWidth()-width)/2, (getHeight()-height)/2, null);
}
} else {
canvas.drawBitmap(bitmap, (getWidth()-width)/2, (getHeight()-height)/2, null);
}
}
}
private void incrementFrameIndex() {
index++;
if (index >= decoder.getFrameCount()) {
index = 0;
}
}
private void decrementFrameIndex() {
index--;
if (index < 0) {
index = decoder.getFrameCount() - 1;
}
}
public void play() {
time = System.currentTimeMillis();
playFlag = true;
invalidate();
}
public void pause() {
playFlag = false;
invalidate();
}
public void stop() {
playFlag = false;
index = 0;
invalidate();
}
public void nextFrame() {
if (decodeStatus == DECODE_STATUS_DECODED) {
incrementFrameIndex();
invalidate();
}
}
public void prevFrame() {
if (decodeStatus == DECODE_STATUS_DECODED) {
decrementFrameIndex();
invalidate();
}
}
}
GifDecoder.java
package com.example.demo;
import java.io.InputStream;
import java.util.Vector;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
public class GifDecoder {
/**
* File read status: No errors.
*/
public static final int STATUS_OK = 0;
/**
* File read status: Error decoding file (may be partially decoded)
*/
public static final int STATUS_FORMAT_ERROR = 1;
/**
* File read status: Unable to open source.
*/
public static final int STATUS_OPEN_ERROR = 2;
/** max decoder pixel stack size */
protected static final int MAX_STACK_SIZE = 4096;
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 forever
protected int[] gct; // global color table
protected int[] lct; // local color table
protected int[] act; // active color table
protected int bgIndex; // background color index
protected int bgColor; // background color
protected int lastBgColor; // previous bg color
protected int pixelAspect; // pixel aspect ratio
protected boolean lctFlag; // local color table flag
protected boolean interlace; // interlace flag
protected int lctSize; // local color table size
protected int ix, iy, iw, ih; // current image rectangle
protected int lrx, lry, lrw, lrh;
protected Bitmap image; // current frame
protected Bitmap lastBitmap; // previous frame
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 index
// LZW decoder working arrays
protected short[] prefix;
protected byte[] suffix;
protected byte[] pixelStack;
protected byte[] pixels;
protected Vector<GifFrame> frames; // frames read from current file
protected int frameCount;
private static class GifFrame {
public GifFrame(Bitmap im, int del) {
image = im;
delay = del;
}
public Bitmap image;
public int delay;
}
/**
* Gets display duration for specified frame.
*
* @param n
* int index of frame
* @return delay in milliseconds
*/
public int getDelay(int n) {
delay = -1;
if ((n >= 0) && (n < frameCount)) {
delay = frames.elementAt(n).delay;
}
return delay;
}
/**
* Gets the number of frames read from file.
*
* @return frame count
*/
public int getFrameCount() {
return frameCount;
}
/**
* Gets the first (or only) image read.
*
* @return BufferedBitmap containing first frame, or null if none.
*/
public Bitmap getBitmap() {
return getFrame(0);
}
/**
* Gets the "Netscape" iteration count, if any. A count of 0 means repeat indefinitiely.
*
* @return iteration count if one was specified, else 1.
*/
public int getLoopCount() {
return loopCount;
}
/**
* Creates new frame image from current data (and previous frames as specified by their disposition codes).
*/
protected void setPixels() {
// expose destination image's pixels as int array
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) {
lastBitmap = getFrame(n - 1);
} else {
lastBitmap = null;
}
}
if (lastBitmap != null) {
lastBitmap.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;
break;
default:
break;
}
}
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.ARGB_4444);
}
/**
* Gets the image contents of frame n.
*
* @return BufferedBitmap representation of frame, or null if n is invalid.
*/
public Bitmap getFrame(int n) {
if (frameCount <= 0)
return null;
n = n % frameCount;
return ((GifFrame) frames.elementAt(n)).image;
}
/**
* Reads GIF image from stream
*
* @param is
* containing GIF file.
* @return read status code (0 = no errors)
*/
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) {
}
return status;
}
/**
* Decodes LZW image data into pixel array. Adapted from John Cristy's BitmapMagick.
*/
protected void decodeBitmapData() {
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[MAX_STACK_SIZE];
}
if (suffix == null) {
suffix = new byte[MAX_STACK_SIZE];
}
if (pixelStack == null) {
pixelStack = new byte[MAX_STACK_SIZE + 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; // XXX ArrayIndexOutOfBoundsException
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 >= MAX_STACK_SIZE) {
break;
}
pixelStack[top++] = (byte) first;
prefix[available] = (short) old_code;
suffix[available] = (byte) first;
available++;
if (((available & code_mask) == 0) && (available < MAX_STACK_SIZE)) {
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
}
}
/**
* Returns true if an error was encountered during reading/decoding
*/
protected boolean err() {
return status != STATUS_OK;
}
/**
* Initializes or re-initializes reader
*/
protected void init() {
status = STATUS_OK;
frameCount = 0;
frames = new Vector<GifFrame>();
gct = null;
lct = null;
}
/**
* Reads a single byte from the input stream.
*/
protected int read() {
int curByte = 0;
try {
curByte = in.read();
} catch (Exception e) {
status = STATUS_FORMAT_ERROR;
}
return curByte;
}
/**
* Reads next variable length block from input.
*
* @return number of bytes stored in "buffer"
*/
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;
}
/**
* Reads color table as 256 RGB integer values
*
* @param ncolors
* int number of colors to read
* @return int array containing 256 colors (packed ARGB with full alpha)
*/
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;
}
/**
* Main file parser. Reads GIF content blocks.
*/
protected void readContents() {
// read GIF file content blocks
boolean done = false;
while (!(done || err())) {
int code = read();
switch (code) {
case 0x2C: // image separator
readBitmap();
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;
case 0xfe:// comment extension
skip();
break;
case 0x01:// plain text extension
skip();
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;
}
}
}
/**
* Reads Graphics Control Extension values
*/
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
}
/**
* Reads GIF file header information.
*/
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];
}
}
/**
* Reads next frame image
*/
protected void readBitmap() {
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
lctSize = (int) Math.pow(2, (packed & 0x07) + 1);
// 3 - sort flag
// 4-5 - reserved lctSize = 2 << (packed & 7); // 6-8 - local color
// table size
interlace = (packed & 0x40) != 0;
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;
}
decodeBitmapData(); // decode pixel data
skip();
if (err()) {
return;
}
frameCount++;
// create new image to receive frame data
image = Bitmap.createBitmap(width, height, Config.ARGB_4444);
setPixels(); // transfer pixel data to image
frames.addElement(new GifFrame(image, delay)); // add image to frame
// list
if (transparency) {
act[transIndex] = save;
}
resetFrame();
}
/**
* Reads Logical Screen Descriptor
*/
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
}
/**
* Reads Netscape extenstion to obtain iteration count
*/
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());
}
/**
* Reads next 16-bit value, LSB first
*/
protected int readShort() {
// read 16-bit value, LSB first
return read() | (read() << 8);
}
/**
* Resets frame state for reading next image.
*/
protected void resetFrame() {
lastDispose = dispose;
lrx = ix;
lry = iy;
lrw = iw;
lrh = ih;
lastBitmap = 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());
}
}
如何使用？
将所有图像放在 res/drawable 文件夹而不是资产文件夹中。
gif_view = new GifWebView(this);
gif_view.setGifImageResourceID(R.drawable.apple);
gif_linear_layout.addView(gif_view);