如何在活动中添加可变数量的 TextViews 和 EditViews

Question

我目前正在尝试将用户定义数量的 TextViews 和 EditText 添加到活动中，但除了通过创建各种不同的活动对其进行硬编码之外似乎无法做到这一点。

此活动的目标是获取玩家的姓名，其数量由先前活动的额外意图中继。

我正在尝试添加一个 TextView 说“玩家 X：” 和一个 EditText 来输入每个玩家的玩家名称

我从这篇文章中知道：How to create a variable number of textviews in android 我必须以编程方式执行此操作，但是，它似乎对我不起作用（测试时活动保持空白）

我尝试创建一个临时 LinearLayout，我在 for() 中添加了两个视图，但仍然没有。

有什么想法吗？我在正确的轨道上吗？

最好的问候

[编辑] 代码在这里：

public class players extends AppCompatActivity {

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

    Bundle extras = new Bundle();
    final int numPlayers = extras.getInt("num");
    final LinearLayout myLayout = findViewById(R.id.lin_Re);
    final ArrayList<Player> players = new ArrayList<>();



    int size = numPlayers; // total number of TextViews to add

    TextView[] tv = new TextView[size];
    TextView temp;
    EditText[] et = new EditText[size];
    EditText temp2;
    LinearLayout temp3;

    for (int i = 0; i < size; i++)
    {
        temp = new TextView(this);
        temp2 = new EditText(this);
        temp3 = new LinearLayout(this);

        temp.setText("Player " + i + " : "); //arbitrary task

        // add the textview to the linearlayout
        temp3.addView(temp);
        temp3.addView(temp2);

        tv[i] = temp;
        et[i] = temp2;

        myLayout.addView(temp3);
    }


<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 
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">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:gravity="center"
        android:id="@+id/lin_Re">



    </LinearLayout>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/b_send"/>

</LinearLayout>

Answer 1

有两种方法可以实现：
1. 使用RecyclerView [推荐]
2.以编程方式将TextView和EditText（嵌套在水平LinearLayout中）添加到嵌套在ScrollView中的垂直LinearLayout中

如果您熟悉RecyclerView 或ListView，我在下面描述的第一个解决方案非常简单，第二个解决方案（您当前的轨道）有点棘手但仍然可以实现。

解决方案 1：

MainActivity

public class MainActivity extends AppCompatActivity {

    RecyclerView mPlayerList;
    List<String> mPlayerNames;
    PlayerAdapter mAdapter;
    EditText mInput;
    Button mCreateButton;



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

        mPlayerNames = new ArrayList<>();

        // setup recycler view
        mPlayerList = findViewById(R.id.player_list);
        mPlayerList.setLayoutManager(new LinearLayoutManager(this));
        mAdapter = new PlayerAdapter();
        mPlayerList.setAdapter(mAdapter);

        // setup input EditText
        mInput = findViewById(R.id.input);

        // setup Create button
        mCreateButton = findViewById(R.id.create_button);
        mCreateButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // clear old player names
                mPlayerNames.clear();

                // read user input: number of player:
                String input = mInput.getText().toString();
                int numberOfPlayer;
                try {
                    numberOfPlayer = Integer.parseInt(input);
                } catch (NumberFormatException e) {
                    Toast.makeText(MainActivity.this, "Invalid input!!!", Toast.LENGTH_SHORT).show();
                    return;
                }
                for (int i = 0; i < numberOfPlayer; ++i) {
                    mPlayerNames.add("Player #" + (i + 1));
                }

                // make change on recycler view
                mAdapter.notifyDataSetChanged();

                // dismiss keyboard
                InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
                imm.hideSoftInputFromWindow(mInput.getWindowToken(), 0);

            }
        });
    }

    private class PlayerAdapter extends RecyclerView.Adapter<PlayerAdapter.PlayerHolder> {


        @Override
        public PlayerHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View v = LayoutInflater.from(MainActivity.this).inflate(R.layout.item_layout, parent, false);
            return new PlayerHolder(v);
        }


        @Override
        public void onBindViewHolder(PlayerHolder holder, int position) {
            holder.bind(mPlayerNames.get(position));
        }

        @Override
        public int getItemCount() {
            return mPlayerNames.size();
        }

        public class PlayerHolder extends RecyclerView.ViewHolder {

            TextView mPlayerLabel;
            EditText mPlayerName;


            public PlayerHolder(View itemView) {
                super(itemView);
                mPlayerLabel = itemView.findViewById(R.id.player_label);
                mPlayerName = itemView.findViewById(R.id.player_name);
            }

            public void bind(String playerName) {
                mPlayerLabel.setText(playerName);
                mPlayerName.setHint("Name of " + playerName);
            }
        }
    }
}

示例项目可以在这里找到：
https://github.com/raiytu4/stackcase004