java - 在fragment后台线程中更新TextView(UI线程)

Question

我正在尝试使用 I 的值更新 TextView ，因为它在后台线程中迭代 for 循环。我查看了其他答案并尝试了几种方法，但它没有更新。任何有关我做错的事情的建议都会受到赞赏。

这是我最近的尝试:

        new Thread(){
            public void run(){
                // Start the detailed search of channels
                YoutubeChannelInfoConnector yc = new YoutubeChannelInfoConnector(getActivity());
                channelinfosearchResults = yc.search(chanelIdToSearchStringBuilder.toString());

                handler.post(new Runnable(){
                    public void run(){

                                // Add the new influencers to the database
                                for (int i = 0; i < youtubeCompleteArraylistOfChannelsSearchedInDetail.size(); i++){

                                    final int finalI = i;
                                    getActivity().runOnUiThread(new Runnable() {
                                        public void run() {
                                            String addedInt = String.valueOf(finalI);
                                            newRecordsAddedToDatabaseTextView.setText(addedInt);
                                        }
                                    });

                                    Log.d("Database","record added " + i);
                                }

                                Toast.makeText(getActivity(), "Database Updated", Toast.LENGTH_SHORT).show();
                                loadingview.setVisibility(View.GONE);




                            } else {

                                // continue in the detailed search of channels
                                searchYoutubeChannels(channelsToAdd);
                            }
                        } else {
                            Toast.makeText(getActivity(), "ERROR: THE SEARCH RETURNED NO RESULTS!", Toast.LENGTH_LONG).show();
                        }

                    }
                });
            }
        }.start();
    }

这可能没有绝对意义，因为我必须删掉很多行，以便可以在 stackoverflow 上阅读。

基本上:

我有一个新线程，在该线程中我有一个带有 runnable 的处理程序，它正在运行以下 for 循环:

   // Add the new influencers to the database
                                for (int i = 0; i < youtubeCompleteArraylistOfChannelsSearchedInDetail.size(); i++){

                                    final int finalI = i;
                                    getActivity().runOnUiThread(new Runnable() {
                                        public void run() {
                                            String addedInt = String.valueOf(finalI);
                                            newRecordsAddedToDatabaseTextView.setText(addedInt);
                                        }
                                    });

                                    Log.d("Database","record added " + i);
                                }

我正在使用getActivity.runonUI，因为它在 fragment 中运行。可以吗可能是代码正在运行但仍未更新 TextView 的原因？

更新:

我还使用新的处理程序尝试了以下代码，但也不起作用:

final int finalI = i;
                                    new Handler().post(new Runnable() {
                                        @Override
                                        public void run() {
                                            String addedInt = String.valueOf(finalI);
                                            newRecordsAddedToDatabaseTextView.setText(addedInt);
                                        }
                                    });

预先感谢您的帮助

Answer 1

这样做

 Handler handler=new Handler();
    handler.postDelayed(new Runnable() {
        @Override
        public void run() {

            // Add the new influencers to the database
            for (int i = 0; i < 100; i++){
                String addedInt = String.valueOf(i);
                Log.e("data",addedInt);
                view.setText(addedInt);
                Toast.makeText(MainActivity.this, "Database Updated", Toast.LENGTH_SHORT).show();

        }

        }
    },2000);