我們都知道Android是不直接支援Gif檔案的載入的(當然了現在的Glide圖片載入框架是支援GIF格式的檔案的，Picasso暫時是不支援的，但是為了這一個小小的功能卻匯入一個庫豈不是得不償失，另外我們這裡主要是學習)，但是有時候美工會直接給我們Gif格式的檔案，這時候如果能夠直接使用的話豈不是比使用逐幀動畫方便一些（先不考慮效能的問題），那麼我們就會想辦法，下面是一個自定義的GifView

<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>
 

public class GifView extends View {
    /**
     * 預設為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);
        }
        // 從描述檔案中讀出gif的值，創建出Movie例項
        final TypedArray array = context.obtainStyledAttributes(attrs,
                R.styleable.GifView, defStyle, R.style.AppTheme);
        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));
        }
    }

    /**
     * 設定gif圖資源
     *
     * @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();
    }

    /**
     * 設定暫停
     *
     * @param paused
     */
    public void setPaused(boolean paused) {
        this.mPaused = paused;
        if (!paused) {
            mMovieStart = android.os.SystemClock.uptimeMillis()
                    - mCurrentAnimationTime;
        }
        invalidate();
    }

    /**
     * 判斷gif圖是否停止了
     *
     * @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();
        // 如果第一幀，記錄起始時間
        if (mMovieStart == 0) {
            mMovieStart = now;
        }
        // 取出動畫的時長
        int dur = mMovie.duration();
        if (dur == 0) {
            dur = DEFAULT_MOVIE_DURATION;
        }
        // 算出需要顯示第幾幀
        mCurrentAnimationTime = (int) ((now - mMovieStart) % dur);
    }

    private void drawMovieFrame(Canvas canvas) {
        // 設定要顯示的幀，繪製即可
        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();
    }
}
 

        //設定gif動畫
        mGifView = (GifView) findViewById(R.id.mygifview);
        mGifView.setMovieResource(R.raw.iv);