在看这篇博文之前对attr自定义属性还是不是很熟的童鞋可以先看看：Android中attr详解（）
效果图
显示的事两张动态gif图
实现代码
1、布局activity_main.xml
===”center”android:orientation=”vertical” ><com.practice.noyet.giftest.MyGiftView==”center_horizontal”android:enabled=”false” /><com.practice.noyet.giftest.MyGiftView===”false” /></LinearLayout>
2、自定义的com.practice.noyet.giftest.MyGiftView.java代码（代码中都有注释，我就不废话了）：
package com.practice.noyet.giftest;import android.annotation.SuppressLint;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Movie;import android.os.Build;import android.util.AttributeSet;import android.view.View;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;/** * Created by noyet on 2015/9/24. */{DEFAULT_MOVIE_DURATION = 1000;mGiftId;/** Movie实例，用来显示gift图片 */private Movie mMovie;mMovieStart;mCurrentAnimationTime = 0;mLeft;mTop;mScale;mMeasuredMovieWidth;mMeasuredMovieHeight;mVisible = true;mPaused = false;public MyGiftView(Context context) {this(context, null);}public MyGiftView(Context context, AttributeSet attrs) {this(context, attrs, R.styleable.CustomTheme_gifViewStyle);}public MyGiftView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);setViewAttributes(context, attrs, defStyleAttr);}/**** @param context 上下文* @param attrs 自定义属性* @param defStyle 默认风格*/@SuppressLint(“NewApi”)(Context context, AttributeSet attrs,int defStyle) {if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {setLayerType(View.LAYER_TYPE_SOFTWARE, null);}final TypedArray array = context.obtainStyledAttributes(attrs,R.styleable.MyGiftView, defStyle, R.style.Widget_MyGiftView);mGiftId = array.getResourceId(R.styleable.MyGiftView_gif, -1);mPaused = array.getBoolean(R.styleable.MyGiftView_paused, false);array.recycle();if (mGiftId != -1) {byte[] bytes = getGiftBytes();mMovie = Movie.decodeByteArray(bytes, 0, bytes.length);}}/*** 设置gif图资源* @param giftResId*/(int giftResId) {this.mGiftId = giftResId;byte[] bytes = getGiftBytes();mMovie = Movie.decodeByteArray(bytes, 0, bytes.length);requestLayout();}/*** 手动设置 Movie对象* @param movie Movie*/(Movie movie) {this.mMovie = movie;requestLayout();}/*** 得到Movie对象* @return Movie*/public Movie getMovie() {return mMovie;}/*** 设置要显示第几帧动画* @param time*/(int time) {mCurrentAnimationTime = time;invalidate();}/*** 设置暂停** @param paused*/(boolean paused) {this.mPaused = paused;if (!paused) {mMovieStart = android.os.SystemClock.uptimeMillis()- mCurrentAnimationTime;}invalidate();}/*** 判断gif图是否停止了** @return*/() {return this.mPaused;}(int widthMeasureSpec, int heightMeasureSpec) {if (mMovie != null) {int movieWidth = mMovie.width();int movieHeight = mMovie.height();int maximumWidth = MeasureSpec.getSize(widthMeasureSpec);float scaleW = (float) movieWidth / (float) maximumWidth;mScale = 1f / scaleW;mMeasuredMovieWidth = maximumWidth;mMeasuredMovieHeight = (int) (movieHeight * mScale);setMeasuredDimension(mMeasuredMovieWidth, mMeasuredMovieHeight);} else {setMeasuredDimension(getSuggestedMinimumWidth(),getSuggestedMinimumHeight());}}(boolean changed, int l, int t, int r, int b) {super.onLayout(changed, l, t, r, b);mLeft = (getWidth() – mMeasuredMovieWidth) / 2f;mTop = (getHeight() – mMeasuredMovieHeight) / 2f;mVisible = getVisibility() == View.VISIBLE;}(Canvas canvas) {if (mMovie != null) {if (!mPaused) {updateAnimationTime();drawMovieFrame(canvas);invalidateView();} else {drawMovieFrame(canvas);}}}/*** 重绘*/@SuppressLint(“NewApi”)() {if (mVisible) {if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {postInvalidateOnAnimation();} else {invalidate();}}}/*** 更新当前显示进度*/() {long now = android.os.SystemClock.uptimeMillis();// 如果第一帧，，记录起始时间if (mMovieStart == 0) {mMovieStart = now;}// 取出动画的时长int dur = mMovie.duration();if (dur == 0) {dur = DEFAULT_MOVIE_DURATION;}// 算出需要显示第几帧mCurrentAnimationTime = (int) ((now – mMovieStart) % dur);}/*** 绘制图片* @param canvas 画布*/(Canvas canvas) {// 设置要显示的帧，绘制即可mMovie.setTime(mCurrentAnimationTime);canvas.save(Canvas.MATRIX_SAVE_FLAG);canvas.scale(mScale, mScale);mMovie.draw(canvas, mLeft / mScale, mTop / mScale);canvas.restore();}@SuppressLint(“NewApi”)(int screenState) {super.onScreenStateChanged(screenState);mVisible = screenState == SCREEN_STATE_ON;invalidateView();}@SuppressLint(“NewApi”)(View changedView, int visibility) {super.onVisibilityChanged(changedView, visibility);mVisible = visibility == View.VISIBLE;invalidateView();}(int visibility) {super.onWindowVisibilityChanged(visibility);mVisible = visibility == View.VISIBLE;invalidateView();}/*** 将gif图片转换成byte[]* @return byte[]*/private byte[] getGiftBytes() {ByteArrayOutputStream baos = new ByteArrayOutputStream();InputStream is = getResources().openRawResource(mGiftId);byte[] b = new byte[1024];int len;try {while ((len = is.read(b, 0, 1024)) != -1) {baos.write(b, 0, len);}baos.flush();} catch (IOException e) {e.printStackTrace();} finally {if (is != null) {try {is.close();} catch (IOException e) {e.printStackTrace();}}}return baos.toByteArray();}}天上永远不会掉馅饼，不要因为贪图一时的快乐而付出惨痛的代价，
