Question

我可以在按钮点击的滚动视图中成功添加文本视图，如两个屏幕截图所示：screenshot 1和screenshot 2。但是，如果我希望首先将文本视图添加到屏幕底部，并且每个添加的textview将上一个文本视图推到它上面，这会导致我向上滚动而不是向下滚动以查看过去的文本视图？我一直在努力实现这一目标，并且无法让它发挥作用。有什么建议？我试图简单地改变线性布局布局 - 重力，直到滚动部分进入。

<ScrollView
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginBottom="8dp"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginTop="8dp"
    app:layout_constraintBottom_toTopOf="@+id/editText">
    <LinearLayout
        android:id="@+id/layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:orientation="vertical"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent">
    </LinearLayout>
</ScrollView>
<EditText
    android:id="@+id/editText"
    android:layout_width="250dp"
    android:layout_height="wrap_content"
    android:layout_marginBottom="4dp"
    android:layout_marginEnd="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginStart="8dp"
    android:ems="10"
    android:inputType="textPersonName"
    android:hint="Enter Text"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.508"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toLeftOf="@+id/button" />
<Button
    android:id="@+id/button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Create"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="1dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginEnd="8dp" />


private LinearLayout layout;
private EditText editText;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    layout = (LinearLayout) findViewById(R.id.layout);
    editText = (EditText) findViewById(R.id.editText);
    Button button = (Button) findViewById(R.id.button);
    button.setOnClickListener(onClick());
}
private View.OnClickListener onClick() {
    return new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            layout.addView(createNewTextView(editText.getText().toString()),0);
        }
    };
}
private TextView createNewTextView(String text) {
    final LinearLayout.LayoutParams lparams = new LinearLayout.LayoutParams
            (LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
    final TextView textView = new TextView(this);
    lparams.gravity = Gravity.BOTTOM;
    textView.setLayoutParams(lparams);
    textView.setText("New text: " + text);
    textView.setTextSize(30);;
    return textView;
}

Answer 1

尝试使用RelativeLayout作为根布局。

试试这个：

<RelativeLayout 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:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/background">

    <LinearLayout
        android:id="@+id/bottom_layout"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_weight="4">
        <EditText
            android:id="@+id/edit"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"/>
        <Button
            android:id="@+id/butt"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="GO"
            android:layout_weight="4"/>
    </LinearLayout>

    <ScrollView
        android:id="@+id/scroll"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@id/bottom_layout">

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


        </LinearLayout>
    </ScrollView>

</RelativeLayout>

尝试使用scrollview在按钮上添加textview

1 个答案: