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如何在活动中添加数量可变的TextView和EditView

textview android-linearlayout android-edittext android

olirwin · 技术社区 · 6 年前

我目前正在尝试向活动中添加用户定义数量的TextView和EditText,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。

这项活动的目的是记下球员的名字,球员的数量由前一项活动的额外意图传递。

我正在尝试添加一个文本视图,上面写着“Player X:”,以及一个EditText,用于为每个玩家键入玩家的名称

我从这篇文章中了解到: How to create a variable number of textviews in android 但是,我必须以编程方式完成这项工作,这似乎对我不起作用(测试时,活动仍然为空)

我尝试创建了一个临时线性布局,在for()中添加了两个视图,但仍然没有结果。

有什么想法吗?我走对了吗?

顺致敬意,

[编辑]代码在此处:

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>

1 回复 | 直到 6 年前

Tuáº¥n Kiá»t 6 年前

有两种方法可以实现这一点:
1、使用 RecyclerView [推荐]
2、添加 TextView 和 EditText (嵌套在水平 LinearLayout )变成垂直的 线性布局 嵌套在 ScrollView 以编程方式

下面我描述的第一个解决方案非常简单,如果您熟悉 回收视图 或 ListView ,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 :

主要活动

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);
            }
        }
    }
}

示例项目可在此处找到:
https://github.com/raiytu4/stackcase004