Question

你好，我想根据InfoGenBibliotheque类中有多少个字符串列出cardView。我真的不知道如何基于项目计数创建cardViews列表。如果有人可以提供帮助，我将不胜感激。我已经读到我必须创建一个cardview布局文件才能从中创建一个列表。 //编辑所以我设法使用listView和BaseAdapter使其成功。但是，当我执行应用程序时，在哪里找不到边距。

InfoGenBibliotheque类：

JavaVMInitArgs vm_args;
JavaVMOption* options = new JavaVMOption[4];

options[0].optionString = "-Djava.class.path=run.jar";
options[1].optionString = "-Djava.home=jre";
options[2].optionString = "-Xms1m"; // 1MB
options[3].optionString = "-Xmx1g"; // 1GB

vm_args.version = JNI_VERSION_1_6;
vm_args.nOptions = 3;
vm_args.options = options;
vm_args.ignoreUnrecognized = false;

JNI_CreateJavaVM(&jvm, (void**)&env, &vm_args);

我的XML activity_info_generales文件：

   public class InfoGenBibliotheque {

    private String SalutaionsAnglais [] = {
            "Certainly!",
            "Good afternoon.",
            "Good evening sir.",
            "Good Luck.",
            "Good morning."
    };

    private String SalutaionsFrancais [] = {
            "Certainement!",
            "Bon après-midi.",
            "Bonsoir Monsieur.",
            "Bonne chance.",
            "Bonjour."
    };
}

我的cardView xml文件

    <?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="wrap_content"
            tools:context=".ui.InfoGeneralesActivity">

            <ListView
                android:id="@+id/listView"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                android:layout_margin="10dp">

            </ListView>

    </android.support.constraint.ConstraintLayout>

适配器Java文件：

    <?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
    android:id="@+id/expressionCardView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:gravity="center"
    app:cardPreventCornerOverlap="false"
    app:cardCornerRadius="8dp"
    android:padding="-4dp"
    android:layout_marginTop="5dp"
    android:layout_marginBottom="5dp"
    android:layout_marginRight="10dp"
    android:layout_marginLeft="10dp"

    xmlns:android="http://schemas.android.com/apk/res/android">
    <LinearLayout
        android:layout_height="match_parent"
        android:layout_width="match_parent"
        android:weightSum="2"
        android:orientation="vertical"
        android:gravity="center"
        android:padding="4dp">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:background="@color/colorPrimaryDark">
            <TextView
                android:id="@+id/expressionFrancais"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:textColor="@color/colorAccent"
                android:text="Najb Mohammed"
                android:textSize="24dp"
                android:textAlignment="center"
                />
        </LinearLayout>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:background="@color/backgroundColor">
            <TextView
                android:id="@+id/expressionAnglais"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Najb mohammed"
                android:textSize="24dp"
                android:textAlignment="center"/>
        </LinearLayout>

    </LinearLayout>

</android.support.v7.widget.CardView>

填充表达式列表：

  public class ExpressionAdapter extends BaseAdapter {

    private Context context;
    private ArrayList<Expression> expressions;

    public ExpressionAdapter(Context context, ArrayList<Expression> expressions) {
        this.context = context;
        this.expressions = expressions;
    }

    @Override
    public int getCount() {
        return expressions.size();
    }

    @Override
    public Object getItem(int position) {
        return expressions.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if(convertView == null){
            convertView = View.inflate(context, R.layout.expressions_card_view,null);
        }

        TextView expressionFrancais = convertView.findViewById(R.id.expressionFrancais);
        TextView expressionAnglais = convertView.findViewById(R.id.expressionAnglais);
        Expression expression = expressions.get(position);

        expressionFrancais.setText(expression.getExpressionFrancais());
        expressionAnglais.setText(expression.getExpressionAnglais());


        return convertView;
    }
}

表达类

  public class ListExpression {

    public static ArrayList<Expression> getExpressionList(){
        ArrayList<Expression> expressionList = new ArrayList<>();
        InfoGenBibliotheque infoGenBibliotheque = new InfoGenBibliotheque();
        for(int i = 0;i < infoGenBibliotheque.getSalutaionsAnglais().length;i++){
            expressionList.add(new Expression(i,infoGenBibliotheque.getSalutationFrancais(i),infoGenBibliotheque.getSalutationAnglais(i)));
        }
        return expressionList;
    }
}

Answer 1

只需使用CardView作为根元素，边距就会消失：

将CardView放在FrameLayout内可以为您提供边距：

（但是我个人并不认为水平分隔线在卡片上看起来不错。如果您希望它们不可见，请看一下this post或使用RecyclerView而不是ListView。）

第二种方法的XML：

<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

<android.support.v7.widget.CardView

    android:id="@+id/expressionCardView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    app:cardCornerRadius="8dp"
    android:layout_marginTop="5dp"
    android:layout_marginBottom="5dp"
    android:layout_marginRight="10dp"
    android:layout_marginLeft="10dp">
    <LinearLayout
        android:layout_height="match_parent"
        android:layout_width="match_parent"
        android:weightSum="2"
        android:orientation="vertical"
        android:gravity="center"
        android:padding="4dp">
       <!-- skipped inner Views here -->

    </LinearLayout>

</android.support.v7.widget.CardView>
</FrameLayout>

创建一个基于项目计数android的cardview列表

1 个答案: