可检查的ImageView

Question

有没有人知道是否可以使ImageView可检查.我尝试在我的项目中使用State-list drawable资源,我为ImageView检查状态定义图片,但是没有属性可以使ImageView可检查,只能单击.

也许有人知道解决这个问题的方法吗？

Answer 1

使用此自定义ImageView实现(从此处获取):

public class CheckableImageView extends ImageView implements Checkable {
    private boolean mChecked;

    private static final int[] CHECKED_STATE_SET = { android.R.attr.state_checked };

    public CheckableImageView(final Context context, final AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public int[] onCreateDrawableState(final int extraSpace) {
        final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
        if (isChecked())
            mergeDrawableStates(drawableState, CHECKED_STATE_SET);
        return drawableState;
    }

    @Override
    public void toggle() {
        setChecked(!mChecked);
    }

    @Override
    public boolean isChecked() {
        return mChecked;
    }

    @Override
    public void setChecked(final boolean checked) {
        if (mChecked == checked)
            return;
        mChecked = checked;
        refreshDrawableState();
    }
}

Answer 2

而不是使ImageView可检查,您可以设置一个状态列表drawable作为一个复选框的背景,将自动翻转图像.

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_checkable="true" android:drawable="@drawable/icon_pressed" /> <!-- pressed -->
    <item android:state_checked="true" android:drawable="@drawable/icon_focused" /> <!-- focused -->
    <item android:drawable="@drawable/icon_default" /> <!-- default -->
</selector>