第二个活动不会启动适配器类

Question

我正在尝试创建NBA球队的回收视图列表，当单击每支球队时，它将显示该特定球队中NBA球员的回收器视图列表。为了做到这一点，我构建了我的主要活动；NBA_适配器"；在OnCreate方法中，如下所示：

package com.example.nba;

public class MainActivity extends AppCompatActivity implements SearchView.OnQueryTextListener {
state state = new state();
private NBA_Adapter adapter;

private RecyclerView recyclerView;

@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu, menu);
MenuItem searchItem = menu.findItem(R.id.action_search);
SearchView searchView = (SearchView) searchItem.getActionView();
searchView.setOnQueryTextListener(this);
return true;
}
@Override
public void onCreate(Bundle savedInstanceState) {//originally 'protected'
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = findViewById(R.id.recycler_view);
adapter = new NBA_Adapter(getApplicationContext());
recyclerView.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.VERTICAL, false));

}
}

NBA_适配器：

package com.example.nba;

public class NBA_Adapter extends RecyclerView.Adapter<NBA_Adapter.NBAViewHolder> implements Filterable {

public static class NBAViewHolder extends RecyclerView.ViewHolder { //constructer for recyclerview adapter
public LinearLayout containerView;
public TextView textView;

NBAViewHolder(View view) {
super(view);
containerView = view.findViewById(R.id.nba_row);
textView = view.findViewById(R.id.nba_row_text_view);
containerView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) { 
TEAMS current = (TEAMS) containerView.getTag();

Intent intent = new Intent(v.getContext(), SecondMain.class);
intent.putExtra("id", current.getId());
v.getContext().startActivity(intent);
}
});
}
}
}

第二条主线：

public class SecondMain extends AppCompatActivity implements SearchView.OnQueryTextListener {

private int team_id;
private Player_Adapter rapter;
private RecyclerView mrecyclerView;
private RecyclerView.LayoutManager layoutManager;

@Override
public void onCreate(Bundle savedInstanceState) {//originally 'protected'
Log.v("cs100", "I exist!");
team_id = getIntent().getIntExtra("id",0);
Log.v("cs100", "" + team_id);

super.onCreate(savedInstanceState);
setContentView(R.layout.second_main);

mrecyclerView = findViewById(R.id.mrecycler_view);


rapter = new Player_Adapter(getApplicationContext());

mrecyclerView.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false));
state.setstate(false);
mrecyclerView.setAdapter(rapter);
}
}

Android清单：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.nba">
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".SecondMain">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />

</intent-filter>
</activity>
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

现在我可以启动"；SecondMain"；类，就像Log.v语句打印一样明显(意思是在这一点上显示的是球队，而不是球队中的球员(。由于"；MainActivity；几乎与"；SecondMain"；我假设类似于"；MainActivity；发射"；NBA_适配器"；"；SecondMain"；启动"；Player_Adapter"；。Player_ Adapter几乎与"；NBA_适配器"；但它根本没有启动。这就是为什么我怀疑问题在于我如何描述"；SecondMain"；在Android清单中。我只包括了每节课的相关部分。任何关于这个问题的提示或链接都将不胜感激，谢谢！

编辑：下面包含的Player_Adapter类：

public class Player_Adapter extends RecyclerView.Adapter<Player_Adapter.PlayerViewHolder> implements Filterable {
private int team_id;

public class myclass extends AppCompatActivity{
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
team_id = getIntent().getIntExtra("id",0);

recyclerView.setAdapter(adapter);
Log.v("Player",""+ team_id); //Not displaying statement which indicates that "Player_Adapter" is not being launched
}
}
public static class PlayerViewHolder extends RecyclerView.ViewHolder {
public LinearLayout containerView;
public TextView textView;
PlayerViewHolder(View view) {
super(view);
containerView = view.findViewById(R.id.Player_List_row);
textView = view.findViewById(R.id.Player_List_row_text_view);
containerView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) { 
Players current = (Players) containerView.getTag();
Intent intent = new Intent(v.getContext(), Compare_Stats.class);
//we get the "fullName"
intent.putExtra("id", current.getPlayer_id());
v.getContext().startActivity(intent);
}
});
}
}
@NonNull
@Override
public PlayerViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
final View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.player_list, parent, false);
return new PlayerViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull PlayerViewHolder holder, int position) {
Players current = PlayersList.get(position); 
holder.textView.setText(current.FullName()); 
holder.containerView.setTag(current);
}
@Override
public int getItemCount() { 
return PlayersList.size();
}
}

Answer 1

在类myclass中，您肯定在设置适配器，但似乎缺少将LayoutManager设置为RecyclerView的代码。

recyclerView.setLayoutManager(new LinearLayoutManager(this/*Context here*/));

另一个建议是，应该将活动单独保存，而不是将其嵌套在适配器中。