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android - 努力用从数据库填充的 BUTTONS 替换 SPINNER

问题描述

试图用从数据库动态填充的按钮替换微调器。通常微调器使用数组适配器和内置列表项布局“android.R.layout.simple_spinner_item”等。

如果要填充按钮而不是微调器，应该如何修改它？

我应该用按钮布局替换 loadDifficulties() 方法中微调器的布局吗？

在这里它是如何与微调器一起工作的

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_starting_screen);
spinnerDifficulty = findViewById(R.id.spinner_quizlist);
loadDifficulties();
Button startTest = findViewById(R.id.start_test);
startTest.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        startQuiz();
    }
});
}
private void startQuiz() {
ListQuiz selectedLevel = (ListQuiz) spinnerDifficulty.getSelectedItem();
int LevelListID = selectedLevel.getId();
String quizListName = selectedLevel.getName();
Intent intent = new Intent(StartingScreenActivity.this, MainActivity.class);
intent.putExtra(EXTRA_DIFFICULTY_ID, LevelListID);
intent.putExtra(EXTRA_DIFFICULTY_NAME, quizListName);
startActivityForResult(intent, REQUEST_CODE_QUIZ);
}
private void loadDifficulties(){
QuizDbHelper dbHelper = QuizDbHelper.getInstance(this);
List<ListQuiz> LevelList = dbHelper.getAllListQuiz();
ArrayAdapter<ListQuiz> adapterLevelList = new ArrayAdapter<>(this, android.R.layout.simple_spinner_item, LevelList);    adapterLevelList.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerDifficulty.setAdapter(adapterLevelList);
}

标签： androidspinnerandroid-arrayadapterandroid-buttonandroid-adapterview

解决方案

简要地

  • 为按钮创建了 LinearLayout。
  • 我不再需要在 loadDifficulties 中使用 ArrayAdapter。

  • 将所有需要的参数添加到 startQuiz() （在我的情况下为 int & String），仅将方法简化为 Intents。

    private ArrayAdapter <ListQuiz> adapter;
private  Button autobutton;
public int categorySize;
private List<ListQuiz> categoryName;
private LinearLayout QuizListLayout;
private  Button levelButton;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_starting_screen);
autobutton = findViewById(R.id.autobutton);
loadDifficulties();

QuizListLayout = findViewById(R.id.layoutForButtons);
for(int i=0; i<categorySize;i++){

    levelButton =new Button(this);
    levelButton.setText("" + categoryName.get(i));
    levelButton.setId(i);
    final int index = i;
    levelButton.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));
    levelButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            startQuiz(v.getId(), categoryName.get(index).toString());
        }
    });
    QuizListLayout.addView(levelButton);
}
}


private void startQuiz(int LevelListID, String quizListName) {
Intent intent = new Intent(StartingScreenActivity.this, MainActivity.class);
intent.putExtra(EXTRA_DIFFICULTY_ID, LevelListID);
intent.putExtra(EXTRA_DIFFICULTY_NAME, quizListName);
startActivityForResult(intent, REQUEST_CODE_QUIZ);
}

private void loadDifficulties(){
QuizDbHelper dbHelper = QuizDbHelper.getInstance(this);
List<ListQuiz> LevelList = dbHelper.getAllListQuiz();
categorySize = dbHelper.getAllListQuiz().size(); 
categoryName = dbHelper.getAllListQuiz();

按钮布局.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:id="@+id/layoutForButtons">
</LinearLayout>

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