聚焦或点击按钮不刷新来自 Json 解析器 URL 的播放列表

Question

如何实现这个家伙？我的应用程序有两个按钮。

Button1 fetch/retrieve 来自 Json 文件的所有视频播放列表 URL 名为 VideoAll.js
Button2 fetch/retrieve URL 上的 Json 文件中名为 VideoUK.js

我的代码工作正常，当我点击全部 (VideoAll.js) 按钮时它会获取播放列表，但是当我点击英国按钮时它不会刷新，我从 VideoAll.js 得到相同的列表我有关闭应用程序并打开以首先单击 UK 按钮以从 VideoUK.js 获取正确的播放列表，但我再次无法从 All 获取列表。基本上它不会刷新或更新 onclick 甚至 onfocus。每次我点击它都会调用 Json 所以我确定这不是完成的方式，我做错了。

MyActivity

public class VideoPlayerActivity extends Activity implements MediaPlayer.OnPreparedListener {
private DrawerLayout mDrawerLayout;
private ActionBarDrawerToggle mDrawerToggle;
//private Toolbar toolbar;
private ListView mDrawerList;
private CharSequence mDrawerTitle;
private RelativeLayout mDrawerRelativeLayout;

public static final String EXTRA_INDEX = "EXTRA_INDEX";
public static final int PLAYLIST_ID = 6; //Arbitrary, for the example (different from audio)
protected EMVideoView emVideoView;
protected PlaylistManager playlistManager;

protected int selectedIndex = 2;//Auto play first video
private final String VIDEO_URL1 = "http://satdoc.dyndns.info/all.js";
private final String VIDEO_URL2 = "http://satdoc.dyndns.info/uk.js";


private String TAG = "VideoPlayerActivity";
List<VideoItem> videoList = new ArrayList<>();
private FullScreenListener fullScreenListener;
//private Toolbar toolbar;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.video_player_activity);
    setVolumeControlStream(3);

    mDrawerTitle = getTitle();


    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    mDrawerList = (ListView) findViewById(R.id.selection_activity_list);
    mDrawerRelativeLayout = (RelativeLayout) findViewById(R.id.left_drawer);

    emVideoView = (EMVideoView) findViewById(R.id.video_play_activity_video_view);
    emVideoView.setOnPreparedListener(this);


    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
        fullScreenListener = new FullScreenListener();
    }

    goFullscreen();
    emVideoView.setVideoViewControlsCallback(new DefaultControlsCallback());

    initDrawer();

    Button btn = (Button) findViewById(R.id.button);
    Button btn2 = (Button) findViewById(R.id.button2);



    btn.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        @Override
        public void onFocusChange(View v, boolean hasFocus) {
            // TODO Auto-generated method stub
            if (hasFocus) {
                fetchVideos1();
            }
        }

    });


    btn2.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        @Override
        public void onFocusChange(View v, boolean hasFocus) {
            // TODO Auto-generated method stub
            if (hasFocus) {
                fetchVideos2();
            }
        }

    });

 }


/**
 * Fetch for videos online.
 */
public void fetchVideos1() {
    if (NetworkConnectionStatus.isOnline(this)) {//If there is internet connection, load reviews through a http request.
        final ProgressDialog progressDialog = new ProgressDialog(this);

        AsyncHttpClient client = new AsyncHttpClient();
        client.setTimeout(20_000);
        client.get(VIDEO_URL1, new AsyncHttpResponseHandler() {

            @Override
            public void onStart() {
                // called before request is started

            }

            @Override

            public void onSuccess(int statusCode, Header[] headers, byte[] response) {// called when response HTTP status is "200 OK"
                String jsonResponse = new String(response);



                try {


                    JSONArray jsonArray = new JSONArray(jsonResponse);
                    JSONObject jsonObject;
                    String videoTitle, videoUrl;
                    int videoNum;
                    int length = jsonArray.length();


                    for (int i = 0; i < length; ++i) {


                        jsonObject = (JSONObject) jsonArray.get(i);
                        videoTitle = jsonObject.getString("chname");
                        videoUrl = jsonObject.getString("chlink");
                        videoNum = jsonObject.getInt("chid");

                        VideoItem videoItem = new VideoItem(videoTitle, videoUrl, videoNum);
                        videoList.add(videoItem);
                    }


                    setTitle(mDrawerTitle);
                    init();
                    mDrawerList.setAdapter(new VideoSelectionListAdapter(VideoPlayerActivity.this, videoList));

                } catch (Exception e) {
                    Log.e(TAG, e.getMessage(), e);
                }

                progressDialog.dismiss();

            }

            @Override
            public void onFailure(int statusCode, Header[] headers, byte[] errorResponse, Throwable e) {

                Toast.makeText(VideoPlayerActivity.this, "A server error occured, Try again later", Toast.LENGTH_LONG).show();
            }

            @Override
            public void onRetry(int retryNo) {
                // called when request is retried
            }
        });

    } else {
        Toast.makeText(VideoPlayerActivity.this, "No internet connection", Toast.LENGTH_LONG).show();

    }

}




public void fetchVideos2() {
    if (NetworkConnectionStatus.isOnline(this)) {//If there is internet connection, load reviews through a http request.
        final ProgressDialog progressDialog = new ProgressDialog(this);



        AsyncHttpClient client = new AsyncHttpClient();
        client.setTimeout(20_000);
        client.get(VIDEO_URL2, new AsyncHttpResponseHandler() {

            @Override
            public void onStart() {
                // called before request is started

            }

            @Override

            public void onSuccess(int statusCode, Header[] headers, byte[] response) {// called when response HTTP status is "200 OK"
                String jsonResponse = new String(response);



                try {


                    JSONArray jsonArray = new JSONArray(jsonResponse);
                    JSONObject jsonObject;
                    String videoTitle, videoUrl;
                    int videoNum;
                    int length = jsonArray.length();


                    for (int i = 0; i < length; ++i) {


                        jsonObject = (JSONObject) jsonArray.get(i);
                        videoTitle = jsonObject.getString("chname");
                        videoUrl = jsonObject.getString("chlink");
                        videoNum = jsonObject.getInt("chid");

                        VideoItem videoItem = new VideoItem(videoTitle, videoUrl, videoNum);
                        videoList.add(videoItem);
                    }


                    setTitle(mDrawerTitle);
                    init();
                    mDrawerList.setAdapter(new VideoSelectionListAdapter(VideoPlayerActivity.this, videoList));

                } catch (Exception e) {
                    Log.e(TAG, e.getMessage(), e);
                }

                progressDialog.dismiss();

            }

            @Override
            public void onFailure(int statusCode, Header[] headers, byte[] errorResponse, Throwable e) {

                Toast.makeText(VideoPlayerActivity.this, "A server error occured, Try again later", Toast.LENGTH_LONG).show();
            }

            @Override
            public void onRetry(int retryNo) {
                // called when request is retried
            }
        });

    } else {
        Toast.makeText(VideoPlayerActivity.this, "No internet connection", Toast.LENGTH_LONG).show();

    }

}

这是我在服务器上的第二个 Json 文件 (VideoUK.js)

[
{
    "chid": 1,
    "chname": "UK1",
    "chlogo": "",
    "chlink": "http://samplevideoUK1.mp4",
    "chenable": "",
    "chnote": ""
},
{
    "chid": 2,
    "chname": "UK 2",
    "chlogo": "",
    "chlink": "http://samplevideoUK2.mp4",
    "chenable": "",
    "chnote": ""
},
{
    "chid": 3,
    "chname": "UK 3",
    "chlogo": "",
    "chlink": "http://samplevideoUK3.mp4",
    "chenable": "",
    "chnote":

}
]

这里是 (VideoAll.js)

    [
{
    "chid": 1,
    "chname": "Video 1",
    "chlogo": "",
    "chlink": "http://samplevideo1.mp4",
    "chenable": "",
    "chnote": ""
},
{
    "chid": 2,
    "chname": "Video 2",
    "chlogo": "",
    "chlink": "http://samplevideo2.mp4",
    "chenable": "",
    "chnote": ""
},
{
    "chid": 3,
    "chname": "RO 3",
    "chlogo": "",
    "chlink": "http://samplevideo3.mp4",
    "chenable": "",
    "chnote":
}
]

最后是布局中的按钮

 <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:baselineAligned="false">

        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:text="All"
            android:id="@+id/button1"
            android:layout_weight="1" />


    </LinearLayout>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:baselineAligned="false" >

        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:text="@string/uk"
            android:id="@+id/button2"
            android:choiceMode="none"
            android:focusable="true"
            android:fadeScrollbars="false"
            android:layout_weight="1" />

    </LinearLayout>

有人可以至少展示一个示例，说明每次我们单击刷新按钮时如何调用 json 并获取列表吗？。只有首先单击的按钮有效，但之后单击时没有任何变化。抱歉重复，但它让我发疯。

Screenshot of my ap

Answer 1

点击按钮首先清除视频列表

     btn.setOnFocusChangeListener(new View.OnFocusChangeListener() {
            @Override
            public void onFocusChange(View v, boolean hasFocus) {
                // TODO Auto-generated method stub
                if (hasFocus) {
videoList.clear();
                    fetchVideos1();
                }
            }

        });


        btn2.setOnFocusChangeListener(new View.OnFocusChangeListener() {
            @Override
            public void onFocusChange(View v, boolean hasFocus) {
                // TODO Auto-generated method stub
                if (hasFocus) {
videoList.clear();
                    fetchVideos2();
                }
            }

        });

并在 web 服务中设置适配器后通知数据集 chenge：

mDrawerList.notifyDataSetChanged();

请在您的代码中的这一行之后使用：

setTitle(mDrawerTitle);
                init();
                mDrawerList.setAdapter(new VideoSelectionListAdapter(VideoPlayerActivity.this, videoList));

notifyDataSetChanged();

用于刷新适配器

也可以在 vutton click 上清除列表

聚焦或点击按钮不刷新来自 Json 解析器 URL 的播放列表

On focus or onclick button not refreshing playlist from Json parser URL

android

json

parsing

fetch

onfocus