Question

我有这个循环方法来显示ViewPager，并为OnClickListener上的每个图片设置ViewPager。因此，当单击图像时，用户将被带到VideoPlayer类。但是我不知道为什么，点击监听器footage_video_url[i]上的putExtra()总是读取额外的i是最大长度。因此i总是超过最大数组长度，这会导致应用程序崩溃。

我所期待的是，如果显示的图像是footage_thumbnail_url[1]，则额外的字符串分别是footage_video_url[1]，依此类推。有谁知道我哪里出错了？

for(i = 0; i < length; i++){
                final String[] video_url = footage_video_url;
                final String[] thumbnail_url = footage_thumbnail_url;

                //System.out.println("FOOTAGE VIDEO DETAILS " +i+ ": " +video_url[i]);

                FrameLayout content = new FrameLayout(this);
                FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(
                        (int) size, (int) size);
                params.gravity = Gravity.CENTER;

                ImageView imageView = new ImageView(this);
                ImageLoader loader = new ImageLoader(this);

                // Image from URL
                if (footage_thumbnail_url[i].contains("http"))
                    loader.downloadPicture(imageView, footage_thumbnail_url,i);
                else {
                    // Image From SDCard
                    File imgFile = new File(thumbnail_url[i]);
                    Bitmap bitmapImage = loader.decodeFile(imgFile);
                    Drawable drawableImage = new BitmapDrawable(bitmapImage);
                    imageView.setBackgroundDrawable(drawableImage);

                    imageView.setOnClickListener(new View.OnClickListener() {
                        public void onClick(View v) {
                            Intent listIntent = new Intent(getApplicationContext(),
                                    VideoPlayer.class);
                            listIntent.putExtra("video_url", footage_video_url[i]);
                            System.out.println("Video Number "+i+" : "+ footage_video_url[i]);
                            startActivity(listIntent);
                        }
                    });
                }


                content.addView(imageView);

                View overlay = new View(this);
                overlay.setBackgroundResource(R.drawable.btn_play);
                params.gravity = Gravity.CENTER;
                overlay.setLayoutParams(params);
                overlay.invalidate();

                content.addView(overlay);
                pagerViews.add(content);



            }

Answer 1

将imageView作为长度为n的数组。然后在你的for循环之前，再添加1个for循环，你将为所有'n'imageViews设置标签，如下所示：

for(int x=0;x<length;x++)
     imageView[x].setTag(x);

然后在你的循环中替换这些行：

listIntent.putExtra("video_url", footage_video_url[i]);
System.out.println("Video Number "+i+" : "+ footage_video_url[i]);

这些行：

listIntent.putExtra("video_url", footage_video_url[imageView[i].getTag(i)]);
System.out.println("Video Number "+i+" : "+ footage_video_url[imageView[i].getTag(i)]);

希望这可能会有所帮助!!

Answer 2

尝试设置ImageView字符串footage_video_url[i]的标记，然后在OnClickListener中检索它。通过这种方式，您可以确保将正确的字符串放入附加内容中：

imageView.setTag(footage_video_url[i]);
imageView.setOnClickListener(new View.OnClickListener() {
     public void onClick(View v) {
          String theUrl = (String) v.getTag(); // I hope it's a String
          Intent listIntent = new Intent(getApplicationContext(),
                                    VideoPlayer.class);
          listIntent.putExtra("video_url", theUrl);
          System.out.println("Video Number "+i+" : "+ theUrl);
          startActivity(listIntent);
     }
});

循环OnClickListener始终获取错误的索引数组

2 个答案: