首页接口解析

app/src/main/java/com/hi/music/player/api/RequestListener.java

@@ -1,9 +1,5 @@
 package com.hi.music.player.api;
 
-import com.hi.music.player.javabean.response.BaseResponse;
-
-import java.io.IOException;
-
 public interface RequestListener<T> {
 
     void onFail(String errorMsg);

app/src/main/java/com/hi/music/player/javabean/requestbody/BodyHome.java

@@ -13,16 +13,41 @@ public class BodyHome implements Serializable {
 
     private Context context = new Context();
 
-
+    public Context getContext() {
-    private class Context implements Serializable{
+        return context;
-        private Client client = new Client();
     }
 
-    private class Client implements Serializable{
+    public void setContext(Context context) {
+        this.context = context;
+    }
+
+    public class Context implements Serializable{
+        private Client client = new Client();
+
+        public Client getClient() {
+            return client;
+        }
+
+        public void setClient(Client client) {
+            this.client = client;
+        }
+    }
+
+    public class Client implements Serializable{
         private String clientName = "WEB_REMIX";
         private String clientVersion = "1.20220918";
         private String hl = Locale.getDefault().getLanguage();
         private String gl = "US";
         private String platform = "DESKTOP";
+
+        private String visitorData;
+
+        public String getVisitorData() {
+            return visitorData;
+        }
+
+        public void setVisitorData(String visitorData) {
+            this.visitorData = visitorData;
+        }
     }
 }

app/src/main/java/com/hi/music/player/javabean/response/BaseResponse.java

@@ -1,32 +0,0 @@
-package com.hi.music.player.javabean.response;
-
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-
-
-import org.json.JSONException;
-import org.json.JSONObject;
-
-import java.io.IOException;
-
-import okhttp3.MediaType;
-
-import okio.BufferedSource;
-import retrofit2.Response;
-
-public class BaseResponse   {
-
-//    public JSONObject toJsonObject() {
-//        try {
-//            String string = this.string();
-//            return new JSONObject(string);
-//        } catch (IOException | JSONException exception) {
-//            return null;
-//        }
-//    }
-
-
-
-
-
-}

app/src/main/java/com/hi/music/player/javabean/response/ResponseCategory.java

@@ -0,0 +1,37 @@
+package com.hi.music.player.javabean.response;
+
+public class ResponseCategory {
+
+    //类别封面
+    private String covert;
+    //类别标题
+    private String twoTitle;
+
+    //类别描述
+    private String twoSubtitle;
+
+
+    public String getCovert() {
+        return covert;
+    }
+
+    public void setCovert(String covert) {
+        this.covert = covert;
+    }
+
+    public String getTwoTitle() {
+        return twoTitle;
+    }
+
+    public void setTwoTitle(String twoTitle) {
+        this.twoTitle = twoTitle;
+    }
+
+    public String getTwoSubtitle() {
+        return twoSubtitle;
+    }
+
+    public void setTwoSubtitle(String twoSubtitle) {
+        this.twoSubtitle = twoSubtitle;
+    }
+}

app/src/main/java/com/hi/music/player/javabean/response/ResponseHome.java

@@ -1,5 +1,67 @@
 package com.hi.music.player.javabean.response;
 
+import androidx.annotation.Nullable;
+
+import java.util.List;
+
 public class ResponseHome {
+
+
+    //用于更多数据请求的cit
+    private String clickTrackingParams;
+
+    //用于更多数据请求的ctoken
+    private String continuation;
+
+
+    @Nullable
+    //用于更多数据请求的visitorData(只有第一个接口会返回该值)
+    private String  visitorData;
+
+    @Nullable
     private String backgroundUrl;
+    private List<ResponseHomeChild> childList;
+
+
+    public List<ResponseHomeChild> getChildList() {
+        return childList;
+    }
+
+    public void setChildList(List<ResponseHomeChild> childList) {
+        this.childList = childList;
+    }
+
+    public String getClickTrackingParams() {
+        return clickTrackingParams;
+    }
+
+    public void setClickTrackingParams(String clickTrackingParams) {
+        this.clickTrackingParams = clickTrackingParams;
+    }
+
+    public String getContinuation() {
+        return continuation;
+    }
+
+    public void setContinuation(String continuation) {
+        this.continuation = continuation;
+    }
+
+    public String getVisitorData() {
+        return visitorData;
+    }
+
+    public void setVisitorData(String visitorData) {
+        this.visitorData = visitorData;
+    }
+
+    public String getBackgroundUrl() {
+        return backgroundUrl;
+    }
+
+    public void setBackgroundUrl(String backgroundUrl) {
+        this.backgroundUrl = backgroundUrl;
+    }
+
+
 }

app/src/main/java/com/hi/music/player/javabean/response/ResponseHomeChild.java

@@ -0,0 +1,36 @@
+package com.hi.music.player.javabean.response;
+
+import java.util.List;
+
+public class ResponseHomeChild {
+
+    private String HeaderTitle;
+
+    private List<ResponseSingle> singleList;
+    private List<ResponseCategory> categoryList;
+
+
+    public String getHeaderTitle() {
+        return HeaderTitle;
+    }
+
+    public void setHeaderTitle(String headerTitle) {
+        HeaderTitle = headerTitle;
+    }
+
+    public List<ResponseSingle> getSingleList() {
+        return singleList;
+    }
+
+    public void setSingleList(List<ResponseSingle> singleList) {
+        this.singleList = singleList;
+    }
+
+    public List<ResponseCategory> getCategoryList() {
+        return categoryList;
+    }
+
+    public void setCategoryList(List<ResponseCategory> categoryList) {
+        this.categoryList = categoryList;
+    }
+}

app/src/main/java/com/hi/music/player/javabean/response/ResponseSingle.java

@@ -0,0 +1,47 @@
+package com.hi.music.player.javabean.response;
+
+public class ResponseSingle {
+
+    //歌手头像
+    private String SingerHead;
+    //歌曲名字
+    private String SongTitle;
+
+    //歌手名字
+    private String SingerName;
+    //描述
+    private String Description;
+
+
+    public String getSingerHead() {
+        return SingerHead;
+    }
+
+    public void setSingerHead(String singerHead) {
+        SingerHead = singerHead;
+    }
+
+    public String getSongTitle() {
+        return SongTitle;
+    }
+
+    public void setSongTitle(String songTitle) {
+        SongTitle = songTitle;
+    }
+
+    public String getSingerName() {
+        return SingerName;
+    }
+
+    public void setSingerName(String singerName) {
+        SingerName = singerName;
+    }
+
+    public String getDescription() {
+        return Description;
+    }
+
+    public void setDescription(String description) {
+        Description = description;
+    }
+}

app/src/main/java/com/hi/music/player/network/JsonHelper.java

@@ -1,86 +1,46 @@
 package com.hi.music.player.network;
 
 import com.hi.music.player.helper.CommonUtils;
+import com.hi.music.player.javabean.response.ResponseCategory;
+import com.hi.music.player.javabean.response.ResponseHome;
+import com.hi.music.player.javabean.response.ResponseHomeChild;
+import com.hi.music.player.javabean.response.ResponseSingle;
 
 import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;
 
+import java.util.ArrayList;
+import java.util.List;
+
 public class JsonHelper {
 
 
-
+    public static ResponseHome ResolveHomeJson(JSONObject jsonObject) {
-    public static void  ResolveHomeJson(JSONObject jsonObject){
+        ResponseHome responseHome = new ResponseHome();
         try {
-            String bgUrl = jsonObject
+            String bgUrl = getJsonUrl(jsonObject
-                    .getJSONObject("background")
+                    .getJSONObject("background"));
-                    .getJSONObject("musicThumbnailRenderer")
-                    .getJSONObject("thumbnail")
-                    .getJSONArray("thumbnails")
-                    .getJSONObject(0)
-                    .getString("url");
 
-            JSONArray contents = jsonObject
+            JSONObject sectionListRenderer = jsonObject
                     .getJSONObject("contents")
                     .getJSONObject("singleColumnBrowseResultsRenderer")
                     .getJSONArray("tabs")
                     .getJSONObject(0)
                     .getJSONObject("tabRenderer")
                     .getJSONObject("content")
-                    .getJSONObject("sectionListRenderer")
+                    .getJSONObject("sectionListRenderer");
-                    .getJSONArray("contents");
+
             JSONObject responseContext = jsonObject
                     .getJSONObject("responseContext");
             JSONArray serviceTrackingParams = responseContext.getJSONArray("serviceTrackingParams");
             String visitorData = responseContext.getString("visitorData");
+            CommonUtils.LogMsg("----------visitorData=" + visitorData);
 
-            for (int i = 0; i < contents.length(); i++) {
+            responseHome.setBackgroundUrl(bgUrl);
-                JSONObject object = contents.getJSONObject(i);
+            responseHome.setVisitorData(visitorData);
+            getCommonHome(sectionListRenderer, responseHome);
 
-                JSONObject musicCarouselShelfRenderer = object.optJSONObject("musicCarouselShelfRenderer");
-                if(musicCarouselShelfRenderer!= null){
-                    String title = musicCarouselShelfRenderer
-                            .getJSONObject("header")
-                            .getJSONObject("musicCarouselShelfBasicHeaderRenderer")
-                            .getJSONObject("title")
-                            .getJSONArray("runs")
-                            .getJSONObject(0)
-                            .getString("text");
-                    CommonUtils.LogMsg("----------headertitle=" + title);
-                    JSONArray childContents = musicCarouselShelfRenderer
-                            .getJSONArray("contents");
-
-
-                    for (int j = 0; j < childContents.length(); j++) {
-                        JSONObject jsonList = childContents.getJSONObject(j);
-                        JSONObject musicResponsiveListItemRenderer = jsonList.optJSONObject("musicResponsiveListItemRenderer");
-                        if(musicResponsiveListItemRenderer!= null){
-                            String covert = musicResponsiveListItemRenderer
-                                    .getJSONObject("thumbnail")
-                                    .getJSONObject("musicThumbnailRenderer")
-                                    .getJSONObject("thumbnail")
-                                    .getJSONArray("thumbnails")
-                                    .getJSONObject(0)
-                                    .getString("url");
-
-                            String text = musicResponsiveListItemRenderer.getJSONArray("flexColumns")
-                                    .getJSONObject(0)
-                                    .getJSONObject("musicResponsiveListItemFlexColumnRenderer")
-                                    .getJSONObject("text")
-                                    .getJSONArray("runs")
-                                    .getJSONObject(0)
-                                    .getString("text");
-
-                            CommonUtils.LogMsg("      --------------text=" + text+"-covert="+covert);
-                        }
-                    }
-                }
-
-
-
-
-
-            }
 
 
         } catch (JSONException exception) {
@@ -88,5 +48,163 @@ public class JsonHelper {
             exception.printStackTrace();
 
         }
+
+        return responseHome;
+    }
+
+
+    public static ResponseHome ResolveHomeMoreJson(JSONObject jsonObject) {
+        ResponseHome responseHome = new ResponseHome();
+        try {
+
+            JSONObject sectionListContinuation = jsonObject
+                    .getJSONObject("continuationContents")
+                    .getJSONObject("sectionListContinuation");
+
+
+            JSONObject responseContext = jsonObject
+                    .getJSONObject("responseContext");
+            JSONArray serviceTrackingParams = responseContext.getJSONArray("serviceTrackingParams");
+
+            getCommonHome(sectionListContinuation, responseHome);
+
+        } catch (JSONException exception) {
+            CommonUtils.LogMsg("----------exception=");
+            exception.printStackTrace();
+
+        }
+        return responseHome;
+    }
+
+
+    private static void getCommonHome(JSONObject sectionListRenderer, ResponseHome responseHome) throws JSONException {
+
+
+        JSONObject nextContinuationData = sectionListRenderer
+                .getJSONArray("continuations")
+                .getJSONObject(0)
+                .getJSONObject("nextContinuationData");
+
+        //token=continuation,cit= clickTrackingParams
+
+        String clickTrackingParams = nextContinuationData.getString("clickTrackingParams");
+        String continuation = nextContinuationData.getString("continuation");
+        CommonUtils.LogMsg("----------clickTrackingParams=" + clickTrackingParams);
+        CommonUtils.LogMsg("----------continuation=" + continuation);
+        responseHome.setClickTrackingParams(clickTrackingParams);
+        responseHome.setContinuation(continuation);
+
+        JSONArray contents = sectionListRenderer
+                .getJSONArray("contents");
+
+        List<ResponseHomeChild> childList = new ArrayList<>();
+
+        for (int i = 0; i < contents.length(); i++) {
+            ResponseHomeChild responseHomeChild = new ResponseHomeChild();
+            JSONObject object = contents.getJSONObject(i);
+
+            JSONObject musicCarouselShelfRenderer = object.optJSONObject("musicCarouselShelfRenderer");
+            if (musicCarouselShelfRenderer != null) {
+
+                //模块标题
+                String title = getJsonText(musicCarouselShelfRenderer
+                        .getJSONObject("header")
+                        .getJSONObject("musicCarouselShelfBasicHeaderRenderer")
+                        .getJSONObject("title"));
+                CommonUtils.LogMsg("----------headertitle=" + title);
+                responseHomeChild.setHeaderTitle(title);
+                JSONArray childContents = musicCarouselShelfRenderer
+                        .getJSONArray("contents");
+
+
+                List<ResponseCategory> categoryList = new ArrayList<>();
+                List<ResponseSingle> singleList = new ArrayList<>();
+                for (int j = 0; j < childContents.length(); j++) {
+                    JSONObject jsonList = childContents.getJSONObject(j);
+                    JSONObject musicResponsiveListItemRenderer = jsonList.optJSONObject("musicResponsiveListItemRenderer");
+                    if (musicResponsiveListItemRenderer != null) {
+                        ResponseSingle responseSingle = new ResponseSingle();
+
+                        String SingerHead = getJsonUrl(musicResponsiveListItemRenderer
+                                .getJSONObject("thumbnail"));
+
+
+                        JSONArray flexColumns = musicResponsiveListItemRenderer.getJSONArray("flexColumns");
+
+                        //歌名、歌手名字、描述
+                        String SongTitle = "";
+                        String SingerName = "";
+                        String Description = "";
+                        for (int g = 0; g < flexColumns.length(); g++) {
+                            String text = getJsonText(musicResponsiveListItemRenderer.getJSONArray("flexColumns")
+                                    .getJSONObject(g)
+                                    .getJSONObject("musicResponsiveListItemFlexColumnRenderer")
+                                    .getJSONObject("text"));
+                            if (g == 0) SongTitle = text;
+                            if (g == 1) SingerName = text;
+                            if (g == 2) Description = text;
+                        }
+                        responseSingle.setSongTitle(SongTitle);
+                        responseSingle.setSingerName(SingerName);
+                        responseSingle.setSingerHead(SingerHead);
+                        responseSingle.setDescription(Description);
+                        singleList.add(responseSingle);
+                        CommonUtils.LogMsg("      ----------111111111111----SongTitle=" + SongTitle + "--SingerName=" + SingerName + "---Description=" + Description + "--SingerHead=" + SingerHead);
+                    }
+
+                    JSONObject musicTwoRowItemRenderer = jsonList.optJSONObject("musicTwoRowItemRenderer");
+                    if (musicTwoRowItemRenderer != null) {
+                        ResponseCategory responseCategory = new ResponseCategory();
+                        String covert = getJsonUrl(musicTwoRowItemRenderer
+                                .getJSONObject("thumbnailRenderer"));
+
+                        String twoTitle = getJsonText(musicTwoRowItemRenderer.getJSONObject("title"));
+                        String twoSubtitle = getJsonText(musicTwoRowItemRenderer.getJSONObject("subtitle"));
+                        responseCategory.setCovert(covert);
+                        responseCategory.setTwoTitle(twoTitle);
+                        responseCategory.setTwoSubtitle(twoSubtitle);
+                        categoryList.add(responseCategory);
+                        CommonUtils.LogMsg("      ----------2222222222----twoTitle=" + twoTitle + "-twoSubtitle=" + twoSubtitle + "---封面=" + covert);
+                    }
+
+                }
+                responseHomeChild.setCategoryList(categoryList);
+                responseHomeChild.setSingleList(singleList);
+            }
+            childList.add(responseHomeChild);
+        }
+        responseHome.setChildList(childList);
+
+
+    }
+
+    private static String getJsonUrl(JSONObject jsonObject) {
+        try {
+            JSONArray jsonArray = jsonObject.getJSONObject("musicThumbnailRenderer")
+                    .getJSONObject("thumbnail")
+                    .getJSONArray("thumbnails");
+
+            int length = jsonArray.length();
+            CommonUtils.LogMsg("----------length=" + (length - 1));
+            String pngUrl = jsonArray.getJSONObject(length - 1)
+                    .getString("url");
+
+            return pngUrl;
+        } catch (JSONException exception) {
+            return "";
+        }
+    }
+
+
+    private static String getJsonText(JSONObject jsonObject) {
+        try {
+            String text = jsonObject.getJSONArray("runs")
+                    .getJSONObject(0)
+                    .getString("text");
+
+            return text;
+        } catch (JSONException exception) {
+            return "";
+        }
     }
 }

app/src/main/java/com/hi/music/player/network/MusicApi.java

@@ -1,13 +1,12 @@
 package com.hi.music.player.network;
-import com.hi.music.player.javabean.response.BaseResponse;
 
 import io.reactivex.Observable;
 import okhttp3.RequestBody;
 import okhttp3.ResponseBody;
-import retrofit2.Response;
 import retrofit2.http.Body;
 import retrofit2.http.Headers;
 import retrofit2.http.POST;
+import retrofit2.http.Query;
 
 public interface MusicApi {
 
@@ -16,5 +15,20 @@ public interface MusicApi {
     Observable<ResponseBody> getHomeData(@Body RequestBody requestBody);
 
 
+//    "youtubei/v1/browse?ctoken=${baseHomePage.cToken}&continuation=${baseHomePage.continuation}&type=next&itct=${baseHomePage.itct}&prettyPrint=false"
 
+
+    @POST("youtubei/v1/browse")
+    @Headers("X-Goog-Api-Key:AIzaSyAO_FJ2SlqU8Q4STEHLGCilw_Y9_11qcW8")
+    Observable<ResponseBody> getHomeMoreData(@Query("ctoken") String token,
+                                             @Query("continuation") String continuation,
+                                             @Query("type") String type,
+                                             @Query("itct") String itct,
+                                             @Query("prettyPrint") boolean prettyPrint,@Body RequestBody requestBody);
+
+
+//    @POST("youtubei/v1/browse")
+//    @Headers("X-Goog-Api-Key:AIzaSyAO_FJ2SlqU8Q4STEHLGCilw_Y9_11qcW8")
+//    @FormUrlEncoded
+//    Observable<ResponseBody> getHomeMoreData(@FieldMap Map<String,String> map);
 }

app/src/main/java/com/hi/music/player/network/ObserverWrapper.java

@@ -2,7 +2,6 @@ package com.hi.music.player.network;
 
 import com.hi.music.player.api.RequestListener;
 import com.hi.music.player.helper.CommonUtils;
-import com.hi.music.player.javabean.response.BaseResponse;
 
 import io.reactivex.Observer;
 import io.reactivex.disposables.Disposable;

app/src/main/java/com/hi/music/player/network/RetrofitManager.java

@@ -1,17 +1,14 @@
 package com.hi.music.player.network;
 
 import com.google.gson.Gson;
-import com.google.gson.JsonIOException;
 import com.hi.music.player.api.RequestListener;
 import com.hi.music.player.helper.CommonUtils;
 import com.hi.music.player.javabean.requestbody.BodyHome;
-import com.hi.music.player.javabean.response.BaseResponse;
+import com.hi.music.player.javabean.response.ResponseHome;
 
-import org.json.JSONArray;
-import org.json.JSONException;
 import org.json.JSONObject;
 
-import java.io.IOException;
+import java.util.HashMap;
 import java.util.concurrent.TimeUnit;
 
 import io.reactivex.android.schedulers.AndroidSchedulers;
@@ -81,7 +78,6 @@ public class RetrofitManager {
         Gson gson = new Gson();
         String s = gson.toJson(bodyHome);
         RequestBody requestBody = RequestBody.Companion.create(s, JSON);
-//        RequestBody requestBody = RequestBody.create(MediaType.parse("application/json"), s);
         musicApi.getHomeData(requestBody)
                 .subscribeOn(Schedulers.io())
                 .unsubscribeOn(Schedulers.io())
@@ -97,12 +93,47 @@ public class RetrofitManager {
                     public void onSuccess(ResponseBody data) {
                         JSONObject jsonObject = CommonUtils.toJsonObject(data);
                         if (jsonObject != null) {
-                             JsonHelper.ResolveHomeJson(jsonObject);
+                            ResponseHome responseHome = JsonHelper.ResolveHomeJson(jsonObject);
+                            CommonUtils.LogMsg("");
                         }
 
                     }
                 }));
     }
 
+    public void getHomeMoreData(String continuation,String itct,String visitorData) {
+        BodyHome bodyHome = new BodyHome();
+        bodyHome.getContext().getClient().setVisitorData(visitorData);
+        Gson gson = new Gson();
+        String s = gson.toJson(bodyHome);
+        RequestBody requestBody = RequestBody.Companion.create(s, JSON);
 
+        HashMap<String, String> stringHashMap = new HashMap<>();
+        stringHashMap.put("ctoken",continuation);
+        stringHashMap.put("continuation",continuation);
+        stringHashMap.put("type","next");
+        stringHashMap.put("itct",itct);
+        stringHashMap.put("prettyPrint","false");
+        musicApi.getHomeMoreData(continuation,continuation,"next",itct,false,requestBody)
+                .subscribeOn(Schedulers.io())
+                .unsubscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe(new ObserverWrapper<ResponseBody>(new RequestListener<ResponseBody>() {
+
+                    @Override
+                    public void onFail(String errorMsg) {
+
+                    }
+
+                    @Override
+                    public void onSuccess(ResponseBody data) {
+                        JSONObject jsonObject = CommonUtils.toJsonObject(data);
+                        if (jsonObject != null) {
+                            ResponseHome responseHome = JsonHelper.ResolveHomeMoreJson(jsonObject);
+                            CommonUtils.LogMsg("");
+                        }
+
+                    }
+                }));
+    }
 }

app/src/main/java/com/hi/music/player/ui/MainActivity.java

@@ -9,7 +9,7 @@ import com.hi.music.player.ui.BaseActivity;
 public class MainActivity extends BaseActivity<ActivityMainBinding> {
 
 
-// EdgeToEdge.enable(this);
+    // EdgeToEdge.enable(this);
     @Override
     protected ActivityMainBinding getViewBinding() {
         return ActivityMainBinding.inflate(getLayoutInflater());
@@ -20,10 +20,21 @@ public class MainActivity extends BaseActivity<ActivityMainBinding> {
         vb.tv.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
+
                 RetrofitManager.getInstance().getHomeData();
             }
         });
 
+        vb.tv1.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                String continuation = "4qmFsgKrAhIMRkVtdXNpY19ob21lGpoCQ0FONnpBRkhVSGswZFMxUVIzazBaMFJYYjFWQ1EyOUpRa05wVWpWa1JqbDNXVmRrYkZnelRuVlpXRUo2WVVjNU1GZ3lNVEZqTW14cVdETkNhRm95Vm1aamJWWnVZVmM1ZFZsWGQxTklNV3Q1V2tSUmRHRldUa2RoTUZKS1ZteEdSR0ZXVG5GbFIzaERWVlZvTVZORlVYUlVXR3hLVVcxellVOVZNVEZqTW14cVVrZHNlbGt5T1RKYVdFbzFWVWRHYmxwV1RteGpibHB3V1RKVmRGSXlWakJUUnpsMFdsWkNhRm95VlVGQlVVSTJZVU14UkZSblFVSldWazFCUVZaV1ZFRkJSVUpCWDNGamVEY3dTa0ZuWjBVJTNE";
+                String clickTrackingParams = "CBAQybcCIhMIw4eu48bLiAMVvoDkBh2lGTJl";
+                String visitorData = "CgtFQThPOThGYzV0OCjDkqm3BjIKCgJVUxIEGgAgGg%3D%3D";
+                RetrofitManager.getInstance().getHomeMoreData(continuation,clickTrackingParams,visitorData);
+            }
+        });
+
     }
 
     @Override

app/src/main/res/layout/activity_main.xml

@@ -1,9 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:orientation="vertical"
     tools:context=".ui.MainActivity">
 
     <TextView
@@ -16,4 +17,17 @@
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
-</androidx.constraintlayout.widget.ConstraintLayout>
+
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Hello World!"
+        android:id="@+id/tv1"
+        android:layout_marginTop="200dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</LinearLayout>