android gif动图播放

一，自定义MyGifView类

package com.incomrecycle.prms.rvm.gui.activity.view;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStream;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.graphics.Movie;

import android.graphics.drawable.BitmapDrawable;

import android.graphics.drawable.Drawable;

import android.os.Handler;

import android.os.Message;

import android.util.AttributeSet;

import android.util.Log;

import android.view.View;

public class MyGifView extends View {

private long movieStart;

private Movie movie;

private Drawable drawable;

private String is_scale = null;

private boolean hasDrawn = false;

private final static int what_update = 1;

Handler handler = new Handler() {

public void handleMessage(Message msg) {

if(msg.what == what_update) {

invalidate();

}

}

};

public MyGifView(Context context, AttributeSet attributeSet) {

super(context, attributeSet);

movie = null;

drawable = null;

is_scale = attributeSet.getAttributeValue(null,"is_scale");

String filename = attributeSet.getAttributeValue(null,"filename");

String str_res_id = attributeSet.getAttributeValue(null,"res_id");

if(str_res_id != null) {

str_res_id = str_res_id.trim();

if(str_res_id.length() == 0)

str_res_id = null;

}

int res_id = -1;

if(str_res_id != null)

res_id = attributeSet.getAttributeResourceValue(null, "res_id", 0);

updateResource(res_id, filename);

}

private static byte[] read(InputStream is) {

byte[] buff = new byte[1024];

ByteArrayOutputStream baos = new ByteArrayOutputStream();

int readLen;

try {

while((readLen = is.read(buff)) > 0) {

baos.write(buff, 0, readLen);

}

} catch (IOException e) {

e.printStackTrace();

}

return baos.toByteArray();

}

private static byte[] readFile(String filename) {

File file = new File(filename);

if(!file.isFile())

return null;

InputStream is = null;

try {

is = new FileInputStream(file);

if(is == null)

return null;

return read(is);

} catch(Exception e) {

return null;

} finally {

close(is);

}

}

private static void close(InputStream is) {

try {

if(is != null)

is.close();

} catch(Exception e) {

}

}

public void updateResource(int res_id, String filename) {

if(filename != null) {

filename = filename.trim();

if(filename.length() == 0)

filename = null;

}

Movie movie = null;

Drawable drawable = null;

if(filename != null) {

File file = new File(filename);

if(file.isFile()) {

try {

byte[] data = readFile(filename);

movie = Movie.decodeByteArray(data, 0, data.length);

} catch(Exception e) {

}

if(movie == null) {

//drawable = Drawable.createFromPath(filename);

drawable = fitSizeImg(filename);

}

}

}

if(movie == null && drawable == null && res_id != -1) {

InputStream is = null;

is = getResources().openRawResource(res_id);

if(is != null) {

try {

movie = Movie.decodeStream(is);

} catch(Exception e) {

}

try {

if(movie == null){

//drawable = Drawable.createFromStream(is, null);

drawable = fitSizeImg(is);

}

} catch(Exception e) {

}

try {

if(is != null)

is.close();

} catch(Exception e) {

}

}

}

if(drawable != null || movie != null) {

synchronized(this) {

this.drawable = drawable;

this.movie = movie;

}

if(hasDrawn) {

Message msg = new Message();

msg.what = what_update;

handler.sendMessage(msg);

}

}

}

 public static Drawable fitSizeImg(InputStream is) {

 Bitmap resizeBmp = null;

 Drawable drawable = null;

 try {

int resSize = is.available();

         BitmapFactory.Options opts = new   BitmapFactory.Options();

         opts.inTempStorage = new byte[16 * 1024];

         opts.inPreferredConfig = Bitmap.Config.ARGB_8888;

         opts.inJustDecodeBounds = true;

         if (resSize < 20480) {       // 0-20k

          opts.inSampleSize = 1;

         } else if (resSize < 51200) { // 20-50k

          opts.inSampleSize = 1;

         } else if (resSize < 102400) { // 50-100k

      opts.inSampleSize = 1;

     } else if (resSize < 307200) { // 100-300k

          opts.inSampleSize = 1;

         } else if (resSize < 409600) { // 300-400k

          opts.inSampleSize = 1;

         } else if (resSize < 819200) { // 400-800k

          opts.inSampleSize = 2;

         } else if (resSize < 1048576) { // 800-1024k

          opts.inSampleSize = 4;

         } else if (resSize < 1310720) { // 1024-1280k

          opts.inSampleSize = 6;

         }else {

          opts.inSampleSize = 8;

         }

         opts.inDither=false;

         opts.inPurgeable = true;

         opts.inInputShareable = true;

         BitmapFactory.Options.class.getField("inNativeAlloc").setBoolean(opts,true); 

         if(is != null){

         resizeBmp = BitmapFactory.decodeStream(is, null, opts);

         opts.inJustDecodeBounds = false;

         is.close();

           drawable =  new BitmapDrawable(resizeBmp);

           resizeBmp = null;

         }

         return drawable;

} catch (Exception e) {

e.printStackTrace();

}

 return drawable;

 }

 public static Drawable fitSizeImg(String path) {

          if(path == null || path.length()<1 ) return null;

          File file = new File(path);

          FileInputStream fs = null; 

          Bitmap resizeBmp = null;

          Drawable drawable = null;

          BitmapFactory.Options opts = new   BitmapFactory.Options();

          opts.inTempStorage = new byte[16 * 1024];

          opts.inPreferredConfig = Bitmap.Config.ARGB_8888;

          opts.inJustDecodeBounds = true;

          if (file.length() < 20480) {       // 0-20k

           opts.inSampleSize = 1;

          } else if (file.length() < 51200) { // 20-50k

           opts.inSampleSize = 1;

          } else if (file.length() < 102400) { // 50-100k

           opts.inSampleSize = 1;

          } else if (file.length() < 307200) { // 100-300k

           opts.inSampleSize = 1;

          } else if (file.length() < 409600) { // 300-400k

           opts.inSampleSize = 1;

          } else if (file.length() < 819200) { // 400-800k

           opts.inSampleSize = 2;

          } else if (file.length() < 1048576) { // 800-1024k

           opts.inSampleSize = 4;

          } else if (file.length() < 1310720){ // 1024-1280k

           opts.inSampleSize = 6;

          }else {

           opts.inSampleSize = 8;

          }

          opts.inDither=false;

          opts.inPurgeable = true;

          opts.inInputShareable = true;

          try {

         BitmapFactory.Options.class.getField("inNativeAlloc").setBoolean(opts,true); 

        fs = new FileInputStream(file);

         if(fs != null){

          resizeBmp = BitmapFactory.decodeFileDescriptor(fs.getFD(), null, opts);

//        resizeBmp = BitmapFactory.decodeStream(fs, null, opts);

          opts.inJustDecodeBounds = false;

          fs.close();

             drawable =  new BitmapDrawable(resizeBmp);

             resizeBmp = null;

             return drawable;

         }

        } catch (Exception e) { 

        e.printStackTrace(); 

     }

          return drawable;

        }

@Override

protected void onDraw(Canvas canvas) {

hasDrawn = true;

synchronized(this) {

if (movie != null) {

long curTime = android.os.SystemClock.uptimeMillis();

if (movieStart == 0) {

movieStart = curTime;

}

int duraction = 0;

duraction = movie.duration();

if(duraction == 0) {

if("true".equalsIgnoreCase(is_scale)) {

Log.e("TAG", "movie.width()="+movie.width()+"movie.height()="+movie.height());

   Bitmap bitmap = Bitmap.createBitmap(movie.width(),movie.height(), Bitmap.Config.ARGB_8888);

   Canvas tCanvas = new Canvas(bitmap);

movie.draw(tCanvas, 0, 0);

Drawable drawable = new BitmapDrawable(null, bitmap);

drawable.setBounds(0, 0, this.getWidth(),this.getHeight());

drawable.draw(canvas);

} else {

movie.draw(canvas, 0, 0);

}

} else {

int relTime = (int) ((curTime - movieStart) % duraction);

movie.setTime(relTime);

if("true".equalsIgnoreCase(is_scale)) {

   Bitmap bitmap = Bitmap.createBitmap(movie.width(),movie.height(), Bitmap.Config.ARGB_8888);

   Canvas tCanvas = new Canvas(bitmap);

movie.draw(tCanvas, 0, 0);

Drawable drawable = new BitmapDrawable(null, bitmap);

drawable.setBounds(0, 0, this.getWidth(),this.getHeight());

drawable.draw(canvas);

} else {

movie.draw(canvas, 0, 0);

}

Message msg = new Message();

msg.what = what_update;

handler.sendMessageDelayed(msg, 80);

}

}

if(drawable != null) {

if("true".equalsIgnoreCase(is_scale)) {

drawable.setBounds(0, 0, this.getWidth(),this.getHeight());

} else {

drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),drawable.getIntrinsicHeight());

}

drawable.draw(canvas);

}

}

super.onDraw(canvas);

}

}

二，xml文件中引用is_scale="true"表明支持图片放缩， res_id ="@drawable/holland_demo"引用资源

 <com.incomrecycle.prms.rvm.gui.activity.view.MyGifView

        android:id="@+id/myGifView_demo"

        is_scale="true"

        res_id ="@drawable/holland_demo"

        android:layout_width="282px"

        android:layout_height="161px"

        android:layout_x="708px"

        android:layout_y="401px" />

三，如果想在类中加载动图

myGifView_demo = (MyGifView)findViewById(R.id.myGifView_demo);

myGifView_demo.updateResource(R.drawable.holland_demo, null);

四，结束的时候释放资源

@Override

public void stop() {

isStopped = true;

if(myGifView_demo!=null){

myGifView_demo.updateResource(-1, null);

myGifView_demo.destroyDrawingCache();

}

}