android - 动态 TextView 显示不正确

Question

我正在循环中动态生成一些 TextView。它们正在显示，但我无法在它们之间制造差距。它们显示为一行而不是单独的行。

    <?xml version="1.0" encoding="utf-8"?>
    <ScrollView 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"
    android:fitsSystemWindows="true">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
    >

        <LinearLayout

            android:id="@+id/ll"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:paddingLeft="18dp"
            android:paddingRight="18dp"
            android:paddingTop="60dp"
            android:paddingBottom="@dimen/activity_vertical_margin"
            android:focusableInTouchMode="true"
            android:orientation="vertical">

        </LinearLayout>

    </androidx.constraintlayout.widget.ConstraintLayout>
</ScrollView>

tviewlayout.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/light"
    android:textAlignment="gravity"
    android:padding="10dp"
    android:layout_margin="10dp"
    android:textSize="20sp" />

Java代码

LinearLayout linearLayout =  (LinearLayout) binding.ll;
                for (int i=0; i<arrSplit.length; i++)
                {
                    TextView tv = (TextView)getLayoutInflater().inflate(R.layout.tviewlayout, null);
                    tv.setText(arrSplit[i]);
                    tv.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));
                    linearLayout.addView(tv);
                }

Answer 1

我建议将 recylerview 用于此类目的。它更有效和动态。示例在Kotlin

<?xml version="1.0" encoding="utf-8"?>
<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:id="@+id/consRideInfo"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="@dimen/10dp"
    android:padding="@dimen/10dp"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@id/incActionBar">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rcvList"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingBottom="0dp"
        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:itemCount="3"
        tools:listitem="@layout/row_item" />

</androidx.constraintlayout.widget.ConstraintLayout>

在 Activity 上定义适配器

 private var adapter: GeneralAdapter<DataModel, MainActivity>? = null
 private val list: ArrayList<DataModel> = ArrayList()

并在 onCreate 中

 adapter = GeneralAdapter(R.layout.row_item, list, this)
 binding.rcvList.adapter = adapter

并创建用于显示的适配器

class GeneralAdapter<D, F>(
    val layoutId: Int,
    private val arrayList: ArrayList<D>,
    val listener: F
) : RecyclerView.Adapter<GeneralAdapter.GeneralHolder<D, F>>() {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): GeneralHolder<D, F> {
        val layoutInflater = LayoutInflater.from(parent.context)
        val binding: ViewDataBinding =
            DataBindingUtil.inflate(layoutInflater, layoutId, parent, false)

        return GeneralHolder(binding, listener)
    }

    override fun getItemCount(): Int = arrayList.size

    override fun onBindViewHolder(holder: GeneralHolder<D, F>, position: Int) {
        holder.bind(arrayList[position])
    }

    class GeneralHolder<D, F>(
        private val binding: ViewDataBinding,
        val listener: F
    ) :
        RecyclerView.ViewHolder(binding.root) {
        fun bind(data: D) {
            binding.setVariable(BR.item, data)
            binding.setVariable(BR.presenter, listener)
            binding.executePendingBindings()
        }
    }
}