如何在 activity 中添加可变数量的 TextView 和 EditView

Question

我目前正在尝试将用户定义数量的 TextView 和 EditText 添加到 activity，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.

这个activity的objective就是取球员的名字，号码是通过前面的activity的intent extra中继的。

我正在尝试添加一个 TextView 说 "Player X: " 和一个 EditText 来为每个玩家输入玩家的名字

我从这个 post: How to create a variable number of textviews in android 知道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 activity 保持空白）

我已经尝试创建一个临时 LinearLayout，我在 for() 中将两个视图添加到其中，但仍然没有。

有什么想法吗？我在正确的轨道上吗？

此致

[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（您当前的曲目）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

如何在 activity 中添加可变数量的 TextView 和 EditView

How to add a variable number of TextViews and EditViews in activity

android

textview

android-linearlayout

android-edittext