本文实例讲述了Android中显示GIF动画的实现代码。分享给大家供大家参考，具体如下：

gif图动画在android中还是比较常用的，比如像新浪微博中，有很多gif图片，而且展示非常好，所以我也想弄一个。经过我多方的搜索资料和整理，终于弄出来了，其实github上有很多开源的gif的展示代码，我下载过几个，但是都不是很理想，不是我完全想要的。所以有时候就得自己学会总结，把开源的东西整理成自己的，现在无聊，也正好有朋友需要，所以现在整理了一下，留着以后备用！

废话不多说，直接上图：

在这里主要用的是：android中的android.graphics.Movie 这个类，这是android提供给我们的一个非常方便的工具。

首先，重写控件View,自定义一个展示gif图的GifView，代码如下：

package net.loonggg.gif.view; import net.loonggg.gif.R; 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; public class GifView extends View {   /**    * 默认为1秒    */   private static final int DEFAULT_MOVIE_DURATION = 1000;   private int mMovieResourceId;   private Movie mMovie;   private long mMovieStart;   private int mCurrentAnimationTime = 0;   private float mLeft;   private float mTop;   private float mScale;   private int mMeasuredMovieWidth;   private int mMeasuredMovieHeight;   private boolean mVisible = true;   private volatile boolean mPaused = false;   public GifView(Context context) {     this(context, null);   }   public GifView(Context context, AttributeSet attrs) {     this(context, attrs, R.styleable.CustomTheme_gifViewStyle);   }   public GifView(Context context, AttributeSet attrs, int defStyle) {     super(context, attrs, defStyle);     setViewAttributes(context, attrs, defStyle);   }   @SuppressLint("NewApi")   private void setViewAttributes(Context context, AttributeSet attrs,       int defStyle) {     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {       setLayerType(View.LAYER_TYPE_SOFTWARE, null);     }     // 从描述文件中读出gif的值，创建出Movie实例     final TypedArray array = context.obtainStyledAttributes(attrs,         R.styleable.GifView, defStyle, R.style.Widget_GifView);     mMovieResourceId = array.getResourceId(R.styleable.GifView_gif, -1);     mPaused = array.getBoolean(R.styleable.GifView_paused, false);     array.recycle();     if (mMovieResourceId != -1) {       mMovie = Movie.decodeStream(getResources().openRawResource(           mMovieResourceId));     }   }   /**    * 设置gif图资源    *    * @param movieResId    */   public void setMovieResource(int movieResId) {     this.mMovieResourceId = movieResId;     mMovie = Movie.decodeStream(getResources().openRawResource(         mMovieResourceId));     requestLayout();   }   public void setMovie(Movie movie) {     this.mMovie = movie;     requestLayout();   }   public Movie getMovie() {     return mMovie;   }   public void setMovieTime(int time) {     mCurrentAnimationTime = time;     invalidate();   }   /**    * 设置暂停    *    * @param paused    */   public void setPaused(boolean paused) {     this.mPaused = paused;     if (!paused) {       mMovieStart = android.os.SystemClock.uptimeMillis()           - mCurrentAnimationTime;     }     invalidate();   }   /**    * 判断gif图是否停止了    *    * @return    */   public boolean isPaused() {     return this.mPaused;   }   @Override   protected void onMeasure(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());     }   }   @Override   protected void onLayout(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;   }   @Override   protected void onDraw(Canvas canvas) {     if (mMovie != null) {       if (!mPaused) {         updateAnimationTime();         drawMovieFrame(canvas);         invalidateView();       } else {         drawMovieFrame(canvas);       }     }   }   @SuppressLint("NewApi")   private void invalidateView() {     if (mVisible) {       if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {         postInvalidateOnAnimation();       } else {         invalidate();       }     }   }   private void updateAnimationTime() {     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);   }   private void drawMovieFrame(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")   @Override   public void onScreenStateChanged(int screenState) {     super.onScreenStateChanged(screenState);     mVisible = screenState == SCREEN_STATE_ON;     invalidateView();   }   @SuppressLint("NewApi")   @Override   protected void onVisibilityChanged(View changedView, int visibility) {     super.onVisibilityChanged(changedView, visibility);     mVisible = visibility == View.VISIBLE;     invalidateView();   }   @Override   protected void onWindowVisibilityChanged(int visibility) {     super.onWindowVisibilityChanged(visibility);     mVisible = visibility == View.VISIBLE;     invalidateView();   } }

Movie其实管理着GIF动画中的多个帧，只需要通过 setTime() 一下就可以让它在draw()的时候绘出相应的那帧图像。通过当前时间与duration之间的换算关系，是很容易实现GIF动起来的效果。

其次，在xml布局文件中，把这个view定义进去，代码如下：

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"   android:layout_width="fill_parent"   android:layout_height="fill_parent"   android:orientation="vertical" >   <net.loonggg.gif.view.GifView     android:id="@+id/gif1"     android:layout_width="100dp"     android:layout_height="100dp"     android:layout_gravity="center_horizontal"     android:enabled="false" />   <net.loonggg.gif.view.GifView     android:id="@+id/gif2"     android:layout_width="200dp"     android:layout_height="200dp"     android:layout_gravity="center_horizontal"     android:enabled="false" /> </LinearLayout>

最后，在MainActivity中的使用，代码如下：

package net.loonggg.gif; import net.loonggg.gif.view.GifView; import android.app.Activity; import android.os.Bundle; public class Gif extends Activity {   private GifView gif1, gif2;   @Override   public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.main);     gif1 = (GifView) findViewById(R.id.gif1);     // 设置背景gif图片资源     gif1.setMovieResource(R.raw.kitty);     gif2 = (GifView) findViewById(R.id.gif2);     gif2.setMovieResource(R.raw.b);     // 设置暂停     // gif2.setPaused(true);   } }

注意：与ImageView和其他View唯一的区别在于我加了一个gif属性。

<?xml version="1.0" encoding="utf-8"?> <resources>   <declare-styleable name="GifView">     <attr name="gif" format="reference" />     <attr name="paused" format="boolean" />   </declare-styleable>   <declare-styleable name="CustomTheme">     <attr name="gifViewStyle" format="reference" />   </declare-styleable> </resources>

这个代码已经非常好了，使用也非常方便，其实不懂代码是什么意思也可以很好的用，只需要懂得我写注释的那几行和Activity里面的那几行代码就可以了！

希望本文所述对大家Android程序设计有所帮助。