PostDelayed 和 Handler 不工作并且运行没有延迟

Question

我的 android 项目的可绘制资源文件夹中有一个动画 gif 列表。我需要一张一张地播放这些 gif，等待几秒钟，然后播放下一张 gif。但是当我运行应用程序时，所有 gif 加载速度都非常非常快，所以我只能看到最后一个 gif。我使用 Glide 播放 gif，这是我的代码

Handler handler1 = new Handler();        

for (int a = 1; a<=lines.size() ;a++) {
    handler1.postDelayed(new Runnable() {

        @Override
        public void run() {
            String resName = "";
            int duration = 0;
            resName = "wo_" + (lines.get(slideIndex).split(",")[0]).toLowerCase().trim().replace(".gif", "");
            duration = Integer.parseInt(lines.get(slideIndex++).split(",")[2].trim());
            int resourceId = getResId(resName, R.drawable.class);//this.getResources().getIdentifier(resName, "drawable", this.getPackageName());

            Glide.with(WorkoutActivity.this).asGif().load(resourceId).into(imageView);
        }
    }, 5000);
}

Answer 1

我想你希望你的每个 gif 播放间隔 5000

所以将你的间隔乘以 a 这样你就可以放置 5000,10000,15000

Handler handler1 = new Handler();
        for (int a = 1; a<=lines.size() ;a++) {
            handler1.postDelayed(new Runnable() {

                @Override
                public void run() {
                    String resName = "";
                    int duration = 0;
                    resName = "wo_" + (lines.get(slideIndex).split(",")[0]).toLowerCase().trim().replace(".gif", "");
                    duration = Integer.parseInt(lines.get(slideIndex++).split(",")[2].trim());
                    int resourceId = getResId(resName, R.drawable.class);//this.getResources().getIdentifier(resName, "drawable", this.getPackageName());

                    Glide.with(WorkoutActivity.this).asGif().load(resourceId).into(imageView);
                }
            }, a * 5000);
        }

Answer 2

您可以为此使用计时器

   // Declare globally
private int position = -1;

/**
 * This timer will call each of the seconds.
 */
Timer mTimer = new Timer();
mTimer.schedule(new TimerTask() {
    @Override
    public void run() {
        // As timer is not a Main/UI thread need to do all UI task on runOnUiThread
        getActivity().runOnUiThread(new Runnable() {
            @Override
            public void run() {
                    // increase your position so new image will show
                position++;
                // check whether position increased to length then set it to 0
                // so it will show images in circuler
                if (position >= imageArray.length)
                    position = 0;
                // Set Image
                MyImageView.setImageResource(imageArray[position]);
            }
        });
    }
}, 0, 5000);

Answer 3

but when I run the app, all gifs load very very fast so I can just see the last gif

因为您并行发布所有 Runnable。

不使用 for 循环：

创建处理程序实例：
```
Handler handler1 = new Handler();
```

为处理程序创建可运行对象：

Runnable mRunnable=new Runnable() {
        @Override
        public void run() {
            ListIterator<?> iter = tempLinesArray.listIterator();
            if(iter.hasNext()){
                ? str = iter.next(); // item from lIst
                // do your work here
                ....
                iter.remove(); // remove item from list.
                Glide.with(WorkoutActivity.this).asGif().load(resourceId).listener(new RequestListener<GifDrawable>() {
                    ...
                    @Override
                    public boolean onResourceReady(GifDrawable resource, Object model, Target<GifDrawable> target, DataSource dataSource, boolean isFirstResource) {
                        handler1.postDelayed(mRunnable,5000);
                        return false;
                    }
                }).into(imageView);

            }
        }
    };

最后调用handler1.postDelayed：

ArrayList<?> tempLinesArray=new ArrayList<>();
tempLinesArray.addAll(lines);
handler1.postDelayed(mRunnable,5000);

确保在组件暂停或停止时从处理程序中删除所有回调：

handler1.removeCallbacks(null);

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