android:gif图像在android中从webservice获取数据时不会循环

我是android新手，我想以gif格式显示正在加载的图像。在谷歌搜索后，我发现：

吉维：

package ComponentGif;

import java.io.InputStream;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Movie;
import android.util.AttributeSet;
import android.view.View;

public class GifView extends View {

    private InputStream gifInputStream;
    private Movie gifMovie;
    private int movieWidth, movieHeight;
    private long movieDuration;
    private long mMovieStart;
    private Canvas _canvas = null;

    public GifView(Context context) {
        super(context);
        init(context);
    }

    public GifView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context);
    }

    public GifView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(context);
    }

    private void init(Context context) {
        setFocusable(true);
        gifInputStream = context.getResources().openRawResource(com.example.agency.R.drawable.loading);

        gifMovie = Movie.decodeStream(gifInputStream);
        movieWidth = gifMovie.width();
        movieHeight = gifMovie.height();
        movieDuration = gifMovie.duration();
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        setMeasuredDimension(movieWidth, movieHeight);
    }

    public int getMovieWidth() {
        return movieWidth;
    }

    public int getMovieHeight() {
        return movieHeight;
    }

    public long getMovieDuration() {
        return movieDuration;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        long now = android.os.SystemClock.uptimeMillis();
        if (mMovieStart == 0) { // first time
            mMovieStart = now;
        }

        if (gifMovie != null) {

            int dur = gifMovie.duration();
            if (dur == 0) {
                dur = 1000;
            }

            int relTime = (int) ((now - mMovieStart) % dur);

            gifMovie.setTime(relTime);

            gifMovie.draw(canvas, 0, 0);

            invalidate();

        }
    }

}

在主活动xml中，我添加了以下内容：

> <ComponentGif.GifView
>         android:id="@+id/imgWaitLoading"
>         android:layout_width="wrap_content"
>         android:layout_height="30dp"
>         android:layout_marginBottom="30dp"
>         android:layout_marginLeft="90dp" />

android:id=“@+id/imgWaitLoading” >android:layout\u width=“包装内容” >android:layout_height=“30dp” >android:layout_marginBottom=“30dp” >android:layout_marginLeft=“90dp”/>

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我正在使用webservice获取数据（连接internet），图像在从webservice获取数据完成后开始循环。为什么？

听起来像是从UI线程调用web服务听起来像是从UI线程调用web服务