如何在Android中以编程方式更改编辑文本光标颜色？

Question

在Android系统中，我们可以通过以下方式更改光标颜色：

android:textCursorDrawable=“@drawable/black\u color\u cursor”。

我们如何动态地做到这一点？

在我的情况下，我已经将光标绘图为白色，但我需要改变黑色怎么办？

    // Set an EditText view to get user input
    final EditText input = new EditText(nyactivity);
    input.setTextColor(getResources().getColor(R.color.black));

Answer 1

这是@Jared Rummler函数的重写版本，有几个改进：

• 支持Android4.0。x
• API 22及以上版本不推荐使用特殊的getDrawable（Context，int）函数

private static final Field
        sEditorField,
        sCursorDrawableField,
        sCursorDrawableResourceField;

static {
    Field editorField = null;
    Field cursorDrawableField = null;
    Field cursorDrawableResourceField = null;
    boolean exceptionThrown = false;
    try {
        cursorDrawableResourceField = TextView.class.getDeclaredField("mCursorDrawableRes");
        cursorDrawableResourceField.setAccessible(true);
        final Class<?> drawableFieldClass;
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
            drawableFieldClass = TextView.class;
        } else {
            editorField = TextView.class.getDeclaredField("mEditor");
            editorField.setAccessible(true);
            drawableFieldClass = editorField.getType();
        }
        cursorDrawableField = drawableFieldClass.getDeclaredField("mCursorDrawable");
        cursorDrawableField.setAccessible(true);
    } catch (Exception e) {
        exceptionThrown = true;
    }
    if (exceptionThrown) {
        sEditorField = null;
        sCursorDrawableField = null;
        sCursorDrawableResourceField = null;
    } else {
        sEditorField = editorField;
        sCursorDrawableField = cursorDrawableField;
        sCursorDrawableResourceField = cursorDrawableResourceField;
    }
}

public static void setCursorColor(EditText editText, int color) {
    if (sCursorDrawableField == null) {
        return;
    }
    try {
        final Drawable drawable = getDrawable(editText.getContext(), 
                sCursorDrawableResourceField.getInt(editText));
        drawable.setColorFilter(color, PorterDuff.Mode.SRC_IN);
        sCursorDrawableField.set(Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN
                ? editText : sEditorField.get(editText), new Drawable[] {drawable, drawable});
    } catch (Exception ignored) {
    }
}

private static Drawable getDrawable(Context context, int id) {
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
        return context.getResources().getDrawable(id);
    } else {
        return context.getDrawable(id);
    }
}

Answer 2

android:textCursorDrawable="@null"

然后在应用程序中：

final EditText input = new EditText(nyactivity);
input.setTextColor(getResources().getColor(R.color.black));

从这里出发

Answer 3

通过一些反思，我成功了

爪哇：

// https://github.com/android/platform_frameworks_base/blob/kitkat-release/core/java/android/widget/TextView.java#L562-564
Field f = TextView.class.getDeclaredField("mCursorDrawableRes");
f.setAccessible(true);
f.set(yourEditText, R.drawable.cursor);

XML:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >

    <solid android:color="#ff000000" />

    <size android:width="1dp" />

</shape>

以下是一种不需要XML的方法：

public static void setCursorColor(EditText view, @ColorInt int color) {
  try {
    // Get the cursor resource id
    Field field = TextView.class.getDeclaredField("mCursorDrawableRes");
    field.setAccessible(true);
    int drawableResId = field.getInt(view);

    // Get the editor
    field = TextView.class.getDeclaredField("mEditor");
    field.setAccessible(true);
    Object editor = field.get(view);

    // Get the drawable and set a color filter
    Drawable drawable = ContextCompat.getDrawable(view.getContext(), drawableResId);
    drawable.setColorFilter(color, PorterDuff.Mode.SRC_IN);
    Drawable[] drawables = {drawable, drawable};

    // Set the drawables
    field = editor.getClass().getDeclaredField("mCursorDrawable");
    field.setAccessible(true);
    field.set(editor, drawables);
  } catch (Exception ignored) {
  }
}