AndroidはMovieでGif形式の画像を展示しています

public class CommonGifView extends View {
    private Resources mResources;
    private Movie mMovie;
    private long startTime = 0;
    private float widthRatio;
    private float heightRatio;

    public CommonGifView(Context context) {
        this(context, null);
    }

    public CommonGifView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public CommonGifView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        mResources = context.getResources();
        TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.custom_gif_view);
        int src_id = ta.getResourceId(R.styleable.custom_gif_view_gif_src, -1);
        setGifViewBg(src_id);
        ta.recycle();
    }

    /** *  View  gif       * @description： * @author ldm * @date 2016-2-18   9:21:16 */
    private void setGifViewBg(int src_id) {
        if (src_id == -1) { return; }
        //             
        InputStream is = mResources.openRawResource(src_id);
        mMovie = Movie.decodeStream(is);//       Movie  
        requestLayout();
    }

    /* *      Activity    */
    public void setGifStream(InputStream is) {
        mMovie = Movie.decodeStream(is);
        requestLayout();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        long now = SystemClock.uptimeMillis();
        if (startTime == 0) { //      ，      
            startTime = now;
        }
        if (mMovie != null) {//         null，       GIF  
            int duration = mMovie.duration();//        
            if (duration == 0) {
                duration = 1000;
            }
            int currentTime = (int) ((now - startTime) % duration);//          
            mMovie.setTime(currentTime);
            // mMovie.draw(canvas, getWidth() - mMovie.width(), getHeight() - mMovie.height());
            float scale = Math.min(widthRatio, heightRatio);
            canvas.scale(scale, scale);
            mMovie.draw(canvas, 0, 0);
            invalidate();
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        if (mMovie != null) {//         null，       GIF  
            int w = mMovie.width();//  
            int h = mMovie.height();//  
            if (w <= 0) {
                w = 1;
            }
            if (h <= 0) {
                h = 1;
            }
            int left = getPaddingLeft();
            int right = getPaddingRight();
            int top = getPaddingTop();
            int bottom = getPaddingBottom();
            int widthSize, heightSize;
            w += left + right;
            h += top + bottom;
            w = Math.max(w, getSuggestedMinimumWidth());
            h = Math.max(h, getSuggestedMinimumHeight());
            widthSize = resolveSizeAndState(w, widthMeasureSpec, 0);//         MeasureSpec，         
            heightSize = resolveSizeAndState(h, heightMeasureSpec, 0);
            widthRatio = (float) widthSize / w;
            heightRatio = (float) heightSize / h;
            setMeasuredDimension(widthSize, heightSize);
        }
        else {
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        }
    }
}

カスタム属性res/values/attrs.xmlファイル:

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <declare-styleable name="custom_gif_view">
        <attr name="gif_src" format="reference"></attr>
    </declare-styleable>

</resources>

Activityでの使用:

public class MainActivity extends Activity {
    private CommonGifView view;
    private InputStream is;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        view = (CommonGifView) findViewById(R.id.gif_test);
        try {
            is = getAssets().open("test01.gif");
            view.setGifStream(is);
        }
        catch (IOException e) {
            e.printStackTrace();
        }

    }
}