Question

我试图设置此活动＆＃34; ChoiceList＆＃34;这样，每次单击保存按钮时，都会在ChoiceList活动的scrollView中的linearLayout中添加一个新视图。添加的视图＆＃34; choiceView＆＃34;应该只是frameLayout中包含的textView。但是，出于某种原因，每次单击保存按钮时，都会将新的ChoiceList布局添加到linearLayout而不是ChoiceView。我是一个刚开始教我自己如何开发的业余Android开发人员，所以我不知道问题出在哪里。

以下是我的java和xml文件：

public class ChoiceList extends android.app.Activity implements android.view.View.OnClickListener {

    private ArrayList<ChoiceView> choiceList;

    private Button button;
    private LinearLayout choiceListLayout;
    private ViewGroup parentGroup;

    public void onCreate(Bundle savedInstanceState) {//, List<ChoiceView> list) {
        super.onCreate(savedInstanceState);
        choiceList = new ArrayList<ChoiceView>();
        this.getActionBar().setTitle("");
        this.getActionBar().setDisplayHomeAsUpEnabled(true); // adds a left-facing caret alongside the app icon and enables it as an action button
                                                             // such that when the user presses it, the activity receives a call to
                                                             // onOptionsItemSelected(). The ID for the action is android.R.id.home.
        this.initLayout();
    }

    public void initLayout() {
        this.setContentView(R.layout.activity_choice_list); // set up initial layout
        choiceListLayout = (LinearLayout) findViewById(R.id.choiceListLayout);
        parentGroup = (ViewGroup) choiceListLayout;

        button = (android.widget.Button) findViewById(R.id.saveButton);
        button.setOnClickListener(new android.view.View.OnClickListener() { // when "Save" button is clicked

            @Override
            public void onClick(View v) {
                newChoiceView(); // Makes new ChoiceView with text from EditText
            }
        });
    }

    /**
     * Makes and displays new ChoiceView with text from EditText
     * Called within InitLayout from clicking Save button
     */
    public void newChoiceView() {
        ChoiceView cv = new ChoiceView(this.getApplicationContext());
        choiceList.add(cv); // add ChoiceView to list of ChoiceViews

        choiceListLayout.addView(cv); // display ChoiceView
    }
    ...
}

和相关的xml ...

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

    <ScrollView
        android:id="@+id/choiceScrollView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

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

            <LinearLayout
                android:id="@+id/choiceListLayout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical" >
            </LinearLayout>

            <EditText
                android:id="@+id/enterChoice"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:ems="10"
                android:hint="@string/enterChoiceText" />

            <Button
                android:id="@+id/saveButton"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:text="@string/save"
                android:textColor="@color/white" />
        </LinearLayout>
    </ScrollView>

    <Button
        android:id="@+id/spinButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:text="@string/spin" />

</RelativeLayout>

以及我尝试添加到滚动条的视图...

public class ChoiceView extends RelativeLayout {

    protected TextView tv;
    private String choiceString; // choice text
    private EditText et; // editText from which text comes from

    /**
     * @param context
     */
    public ChoiceView(Context context) {
        super(context);

        LayoutInflater choiceViewInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        final View choiceView = choiceViewInflater.inflate(R.layout.choice_view, this, true);

        LayoutInflater choiceListInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        final View choiceList = choiceListInflater.inflate(R.layout.activity_choice_list, this, true);

        et = (EditText) choiceList.findViewById(R.id.enterChoice); // finds EditText from which string heeds
        tv = (TextView) choiceView.findViewById(R.id.choiceViewTextView); // finds TextView to display text
        tv.setText(et.getText().toString());

        requestLayout();
    }
}

及其相关的xml ...

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/whatever" >

    <TextView
        android:id="@+id/choiceViewTextView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/spin"
        android:padding="5dp" />

</FrameLayout>

如果您需要任何进一步的信息，请与我们联系。

Answer 1

看起来您正在尝试动态地将元素添加到可滚动列表中，以后可以选择该列表。

Android已经提供了一个用于执行此操作的UI组件ListView，它由适配器支持，该适配器将您的模型（即数据）与UI桥接。在这种情况下，您的模型是字符串列表。适配器负责根据需要创建视图（在本例中为TextViews）。 Check out this excellent tutorial.

错误的视图添加到scrollview

1 个答案: