有什么方法可以让用户在 android studio 中的 activity 中添加按钮

Question

所以我正在研究我的大学项目，并且在 android 中仍然是一个新手。我想用七个按钮表示用户上班的天数（7 是因为一周有 7 天）。

由于我们中的许多人并非一周工作 7 天，我希望用户选择并创建一周中的几天来表示按钮。假设如果他周一至周五工作，他应该能够添加 5 个按钮。

搜索了 google 和 android 的站点，但无法解决这个问题。请提供一些解释，因为这对像我这样的初学者会有帮助。谢谢

Answer 1

使用所有 7 个按钮设计您的布局，但根据用户驱动的条件，使用 buttonMonday.setVisibility(View.GONE); 从布局中隐藏相关按钮。 View.GONE 将从布局中删除视图，而 View.INVISIBLE 只会隐藏它。

Answer 2

这不是唯一的方法，但也许你可以试试这个：

activity_main.xml

<androidx.constraintlayout.widget.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"
tools:context=".MainActivity">

<androidx.constraintlayout.widget.ConstraintLayout
    android:id="@+id/parent"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent">


    <CheckBox
        android:id="@+id/sunday"
        android:layout_width="120dp"
        android:layout_marginLeft="60dp"
        android:layout_marginStart="60dp"
        android:layout_height="wrap_content"
        android:text="Sunday"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
         />

    <CheckBox
        android:id="@+id/monday"
        android:layout_width="120dp"
        android:layout_height="wrap_content"
        android:text="Monday"
        app:layout_constraintEnd_toEndOf="parent"
        android:layout_marginRight="60dp"
        android:layout_marginEnd="60dp"
        app:layout_constraintTop_toTopOf="parent" />

    <CheckBox
        android:id="@+id/tuesday"
        android:layout_width="120dp"
        android:layout_height="wrap_content"
        android:text="Tuesday"
        android:layout_marginTop="10dp"
        android:layout_marginLeft="60dp"
        android:layout_marginStart="60dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/sunday" />

    <CheckBox
        android:id="@+id/wednesday"
        android:layout_width="120dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:text="Wednesday"
        android:layout_marginRight="60dp"
        android:layout_marginEnd="60dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/monday" />

    <CheckBox
        android:id="@+id/thrusday"
        android:layout_width="120dp"
        android:layout_height="wrap_content"
        android:text="Thrusday"
        android:layout_marginTop="10dp"
        android:layout_marginLeft="60dp"
        android:layout_marginStart="60dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/tuesday" />

    <CheckBox
        android:id="@+id/friday"
        android:layout_width="120dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:text="Friday"
        android:layout_marginRight="60dp"
        android:layout_marginEnd="60dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/tuesday" />

    <CheckBox
        android:id="@+id/saturday"
        android:layout_width="120dp"
        android:layout_height="wrap_content"
        android:text="Saturday"
        android:layout_marginTop="10dp"
        android:layout_marginLeft="60dp"
        android:layout_marginStart="60dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/thrusday" />

</androidx.constraintlayout.widget.ConstraintLayout>

<Button
    android:id="@+id/open"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Open"
    android:background="@color/colorPrimary"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent" />

<androidx.constraintlayout.widget.ConstraintLayout
    android:id="@+id/constraintLayout2"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="20dp"
    app:layout_constraintTop_toBottomOf="@+id/parent">

    <Button
        android:id="@+id/btnSunday"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Sunday"
        android:visibility="gone"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/btnMonday"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Monday"
        android:visibility="gone"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/btnSunday" />

    <Button
        android:id="@+id/btnTuesday"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Tuesday"
        android:visibility="gone"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/btnMonday" />

    <Button
        android:id="@+id/btnWednesday"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Wednesday"
        android:visibility="gone"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/btnTuesday" />

    <Button
        android:id="@+id/btnThrusday"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Thrusday"
        android:visibility="gone"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/btnWednesday" />

    <Button
        android:id="@+id/btnFriday"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Friday"
        android:visibility="gone"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/btnThrusday" />

    <Button
        android:id="@+id/btnSaturday"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Saturday"
        android:visibility="gone"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/btnFriday" />


</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity

public class MainActivity extends AppCompatActivity {

CheckBox sunday, monday, tuesday, wednesday, thrusday, friday, saturday;
Button btnSunday, btnMonday, btnTuesday, btnWednesday, btnThrusday, btnFriday, btnSaturday, open;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main5);

    init();

    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
    final SharedPreferences.Editor editor = preferences.edit();
    if(preferences.contains("sunday") && preferences.getBoolean("sunday",false) == true) {
        sunday.setChecked(true);
        btnSunday.setVisibility(View.VISIBLE);
    }else {
        sunday.setChecked(false);
        btnSunday.setVisibility(View.GONE);
    }

    if(preferences.contains("monday") && preferences.getBoolean("monday",false) == true) {
        monday.setChecked(true);
        btnMonday.setVisibility(View.VISIBLE);
    }else {
        monday.setChecked(false);
        btnMonday.setVisibility(View.GONE);
    }

    if(preferences.contains("tuesday") && preferences.getBoolean("tuesday",false) == true) {
        tuesday.setChecked(true);
        btnTuesday.setVisibility(View.VISIBLE);
    }else {
        tuesday.setChecked(false);
        btnTuesday.setVisibility(View.GONE);
    }

    if(preferences.contains("wednesday") && preferences.getBoolean("wednesday",false) == true) {
        wednesday.setChecked(true);
        btnWednesday.setVisibility(View.VISIBLE);
    }else {
        wednesday.setChecked(false);
        btnWednesday.setVisibility(View.GONE);
    }

    if(preferences.contains("thrusday") && preferences.getBoolean("thrusday",false) == true) {
        thrusday.setChecked(true);
        btnThrusday.setVisibility(View.VISIBLE);
    }else {
        thrusday.setChecked(false);
        btnThrusday.setVisibility(View.GONE);
    }

    if(preferences.contains("friday") && preferences.getBoolean("friday",false) == true) {
        friday.setChecked(true);
        btnFriday.setVisibility(View.VISIBLE);
    }else {
        friday.setChecked(false);
        btnFriday.setVisibility(View.GONE);
    }

    if(preferences.contains("saturday") && preferences.getBoolean("saturday",false) == true) {
        saturday.setChecked(true);
        btnSaturday.setVisibility(View.VISIBLE);
    }else {
        saturday.setChecked(false);
        btnSaturday.setVisibility(View.GONE);
    }


    open.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            if (sunday.isChecked()){
                btnSunday.setVisibility(View.VISIBLE);
                editor.putBoolean("sunday", true);
                editor.apply();
            } else {
                btnSunday.setVisibility(View.GONE);
                editor.putBoolean("sunday", false);
                editor.apply();
            }

            if (monday.isChecked()){
                btnMonday.setVisibility(View.VISIBLE);
                editor.putBoolean("monday", true);
                editor.apply();
            } else {
                btnMonday.setVisibility(View.GONE);
                editor.putBoolean("monday", false);
                editor.apply();
            }

            if (tuesday.isChecked()){
                btnTuesday.setVisibility(View.VISIBLE);
                editor.putBoolean("tuesday", true);
                editor.apply();
            } else {
                btnTuesday.setVisibility(View.GONE);
                editor.putBoolean("tuesday", false);
                editor.apply();
            }

            if (wednesday.isChecked()){
                btnWednesday.setVisibility(View.VISIBLE);
                editor.putBoolean("wednesday", true);
                editor.apply();
            } else {
                btnWednesday.setVisibility(View.GONE);
                editor.putBoolean("wednesday", false);
                editor.apply();
            }

            if (thrusday.isChecked()){
                btnThrusday.setVisibility(View.VISIBLE);
                editor.putBoolean("thrusday", true);
                editor.apply();
            } else {
                btnThrusday.setVisibility(View.GONE);
                editor.putBoolean("thrusday", false);
                editor.apply();
            }

            if (friday.isChecked()){
                btnFriday.setVisibility(View.VISIBLE);
                editor.putBoolean("friday", true);
                editor.apply();
            } else {
                btnFriday.setVisibility(View.GONE);
                editor.putBoolean("friday", false);
                editor.apply();
            }

            if (saturday.isChecked()){
                btnSaturday.setVisibility(View.VISIBLE);
                editor.putBoolean("saturday", true);
                editor.apply();
            } else {
                btnSaturday.setVisibility(View.GONE);
                editor.putBoolean("saturday", false);
                editor.apply();
            }

        }
    });

}

public void init(){

    sunday = findViewById(R.id.sunday);
    monday = findViewById(R.id.monday);
    tuesday = findViewById(R.id.tuesday);
    wednesday = findViewById(R.id.wednesday);
    thrusday = findViewById(R.id.thrusday);
    friday = findViewById(R.id.friday);
    saturday = findViewById(R.id.saturday);

    btnSunday = findViewById(R.id.btnSunday);
    btnMonday = findViewById(R.id.btnMonday);
    btnTuesday = findViewById(R.id.btnTuesday);
    btnWednesday = findViewById(R.id.btnWednesday);
    btnThrusday = findViewById(R.id.btnThrusday);
    btnFriday = findViewById(R.id.btnFriday);
    btnSaturday = findViewById(R.id.btnSaturday);

    open = findViewById(R.id.open);
}

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