android - 如何以编程方式设置 TextView 的边框颜色？

Question

我正在尝试以编程方式更改 TextView 的边框颜色，具体取决于 Activity 中的 if 条件。这是我的 ViewContact.java 代码:

if (bob == 0) {
  //change colour depending on value

  LayerDrawable layerDrawable = (LayerDrawable) ContextCompat
      .getDrawable(ViewContact.this,R.drawable.textboxes);
  GradientDrawable gradientDrawable = (GradientDrawable) layerDrawable
      .findDrawableByLayerId(R.id.textbox_shape);
  gradientDrawable.setColor(Color.parseColor("#DA850B")); // change color
}

if (bob == 1) {

  LayerDrawable layerDrawable = (LayerDrawable) ContextCompat
      .getDrawable(ViewContact.this,R.drawable.textboxes);
  GradientDrawable gradientDrawable = (GradientDrawable) layerDrawable
      .findDrawableByLayerId(R.id.textbox_shape);
  gradientDrawable.setColor(Color.parseColor("#0A7FDA")); // change color

}

if (bob == 2) {

etc...

}

我看过这里Changing color in a shape inside a layer-list programmatically在这里 Android change color stroke (border) programmatically和其他地方寻求解决方案，但无法使其正常工作。

这是 ViewContact.java Activity 中 TextView 的 xml，activity_view_contact.xml:

        <TextView
            android:id="@+id/textView1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight=".5"
            android:background="@drawable/textboxes"
            />

这是textboxes.xml:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <!--space between each text box-->
    <item
        android:top="3dp"
        android:id="@+id/textbox_shape"
        >
        <shape android:shape="rectangle">
            <!--formatting of colour inside the box-->
            <solid android:color="@android:color/transparent" />
            <!--formatting of lines on the box-->
            <stroke
                android:width="1dip"
                 />
            <corners android:radius="3dp"/>
            <!--text formatting in the box-->
            <padding
                android:textSize="30dp"
                android:top="15dp"
                android:bottom="1dp"
                android:left="20dp"
                android:right="20dp"/>
        </shape>
    </item>
</layer-list>

Answer 1

您正在更改加载的可绘制对象的颜色，而不是 TextView 中使用的颜色。将以下行添加到代码中以在 TextView 中设置背景可绘制元素:

findViewById(R.id.textView1).setBackground(layerDrawable);

您还可以直接使用

获取TextView的背景

LayerDrawable layerDrawable = (LayerDrawable) findViewById(R.id.textView1).getBackground();

这是一组更改背景和描边颜色的代码:

LayerDrawable layerDrawable = (LayerDrawable) findViewById(R.id.textView1).getBackground();
GradientDrawable gradientDrawable = (GradientDrawable) layerDrawable
    .findDrawableByLayerId(R.id.textbox_shape);
// Change background color
gradientDrawable.setColor(Color.parseColor("#DA850B"));
// Change stroke color. (Assumes 5px stroke width.)
gradientDrawable.setStroke(5, Color.parseColor("#FF0000"));