android - 使用多个 RadioButton(自定义 RadioGroup)创建 android RadioGroup

Question

我想实现如下图所示的Single RadioGroup 以进行血型选择。如何做到这一点？

Answer 1

我创建了自己的 RadioGridLayout，其中包含 RadioGroup 代码并扩展了 GridLayout。您可以复制此代码。对我来说工作得很好。在您可以在 xml 中使用此布局并自定义网格布局后。

对于 R.styleable.RadioGridLayout_checked 我使用了这样的代码:

<resources>
    <declare-styleable name="RadioGridLayout">
        <attr name="checked" format="integer" />
    </declare-styleable>
</resources>

public class RadioGridLayout extends GridLayout {

    private int mCheckedId = -1;
    private CompoundButton.OnCheckedChangeListener mChildOnCheckedChangeListener;
    private boolean mProtectFromCheckedChange = false;
    private OnCheckedChangeListener mOnCheckedChangeListener;
    private PassThroughHierarchyChangeListener mPassThroughListener;

    private void setCheckedId(@IdRes int id) {
        mCheckedId = id;
        if (mOnCheckedChangeListener != null) {
            mOnCheckedChangeListener.onCheckedChanged(this, mCheckedId);
        }
        AutofillManager afm = null;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            afm = getContext().getSystemService(AutofillManager.class);
        }
        if (afm != null) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                afm.notifyValueChanged(this);
            }
        }
    }

    public void setOnCheckedChangeListener(OnCheckedChangeListener listener) {
        mOnCheckedChangeListener = listener;
    }

    public interface OnCheckedChangeListener {
        void onCheckedChanged(RadioGridLayout group, @IdRes int checkedId);
    }

    private int mInitialCheckedId = View.NO_ID;

    public RadioGridLayout(Context context) {
        super(context);
        setOrientation(VERTICAL);
        init();
    }

    public RadioGridLayout(Context context, AttributeSet attrs) {
        super(context, attrs);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            if (getImportantForAutofill() == IMPORTANT_FOR_AUTOFILL_AUTO) {
                setImportantForAutofill(IMPORTANT_FOR_AUTOFILL_YES);
            }
        }

        TypedArray attributes = context.obtainStyledAttributes(
                attrs,
                R.styleable.RadioGridLayout,
                R.attr.radioButtonStyle, 0);

        int value = attributes.getResourceId(R.styleable.RadioGridLayout_checked, View.NO_ID);
        if (value != View.NO_ID) {
            mCheckedId = value;
            mInitialCheckedId = value;
        }

        attributes.recycle();
        init();
    }

    private void init() {
        mChildOnCheckedChangeListener = new CheckedStateTracker();
        mPassThroughListener = new PassThroughHierarchyChangeListener();
        super.setOnHierarchyChangeListener(mPassThroughListener);
    }

    @Override
    public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) {
        mPassThroughListener.mOnHierarchyChangeListener = listener;
    }

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        if (mCheckedId != -1) {
            mProtectFromCheckedChange = true;
            setCheckedStateForView(mCheckedId, true);
            mProtectFromCheckedChange = false;
            setCheckedId(mCheckedId);
        }
    }

    @Override
    public void addView(View child, int index, ViewGroup.LayoutParams params) {
        if (child instanceof RadioButton) {
            final RadioButton button = (RadioButton) child;
            if (button.isChecked()) {
                mProtectFromCheckedChange = true;
                if (mCheckedId != -1) {
                    setCheckedStateForView(mCheckedId, false);
                }
                mProtectFromCheckedChange = false;
                setCheckedId(button.getId());
            }
        }

        super.addView(child, index, params);
    }

    public void check(@IdRes int id) {
        if (id != -1 && (id == mCheckedId)) {
            return;
        }

        if (mCheckedId != -1) {
            setCheckedStateForView(mCheckedId, false);
        }

        if (id != -1) {
            setCheckedStateForView(id, true);
        }

        setCheckedId(id);
    }

    private void setCheckedStateForView(int viewId, boolean checked) {
        View checkedView = findViewById(viewId);
        if (checkedView != null && checkedView instanceof RadioButton) {
            ((RadioButton) checkedView).setChecked(checked);
        }
    }

    @IdRes
    public int getCheckedRadioButtonId() {
        return mCheckedId;
    }

    public void clearCheck() {
        check(-1);
    }

    @Override
    public GridLayout.LayoutParams generateLayoutParams(AttributeSet attrs) {
        return new GridLayout.LayoutParams(getContext(), attrs);
    }

    @Override
    protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
        return p instanceof RadioGroup.LayoutParams;
    }

    @Override
    protected GridLayout.LayoutParams generateDefaultLayoutParams() {
        return new LayoutParams();
    }

    @Override
    public CharSequence getAccessibilityClassName() {
        return RadioGroup.class.getName();
    }

    public static class LayoutParams extends GridLayout.LayoutParams {

        public LayoutParams(Spec rowSpec, Spec columnSpec) {
            super(rowSpec, columnSpec);
        }

        public LayoutParams() {
            super();
        }

        public LayoutParams(ViewGroup.LayoutParams params) {
            super(params);
        }

        public LayoutParams(MarginLayoutParams params) {
            super(params);
        }

        public LayoutParams(GridLayout.LayoutParams source) {
            super(source);
        }

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

        @Override
        protected void setBaseAttributes(TypedArray a,
                                         int widthAttr, int heightAttr) {

            if (a.hasValue(widthAttr)) {
                width = a.getLayoutDimension(widthAttr, "layout_width");
            } else {
                width = WRAP_CONTENT;
            }

            if (a.hasValue(heightAttr)) {
                height = a.getLayoutDimension(heightAttr, "layout_height");
            } else {
                height = WRAP_CONTENT;
            }
        }
    }

    private class CheckedStateTracker implements CompoundButton.OnCheckedChangeListener {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if (mProtectFromCheckedChange) {
                return;
            }

            mProtectFromCheckedChange = true;
            if (mCheckedId != -1) {
                setCheckedStateForView(mCheckedId, false);
            }
            mProtectFromCheckedChange = false;

            int id = buttonView.getId();
            setCheckedId(id);
        }
    }

    private class PassThroughHierarchyChangeListener implements
            ViewGroup.OnHierarchyChangeListener {
        private ViewGroup.OnHierarchyChangeListener mOnHierarchyChangeListener;

        @Override
        public void onChildViewAdded(View parent, View child) {
            if (parent == RadioGridLayout.this && child instanceof RadioButton) {
                int id = child.getId();
                if (id == View.NO_ID) {
                    id = View.generateViewId();
                    child.setId(id);
                }
                ((RadioButton) child).setOnCheckedChangeListener(
                        mChildOnCheckedChangeListener);
            }

            if (mOnHierarchyChangeListener != null) {
                mOnHierarchyChangeListener.onChildViewAdded(parent, child);
            }
        }

        @Override
        public void onChildViewRemoved(View parent, View child) {
            if (parent == RadioGridLayout.this && child instanceof RadioButton) {
                ((RadioButton) child).setOnCheckedChangeListener(null);
            }

            if (mOnHierarchyChangeListener != null) {
                mOnHierarchyChangeListener.onChildViewRemoved(parent, child);
            }
        }
    }

    @Override
    public void onProvideAutofillStructure(ViewStructure structure, int flags) {
        super.onProvideAutofillStructure(structure, flags);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            structure.setDataIsSensitive(mCheckedId != mInitialCheckedId);
        }
    }

    @Override
    public void autofill(AutofillValue value) {
        if (!isEnabled()) return;

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            if (!value.isList()) {
                Timber.w(value + " could not be autofilled into " + this);
                return;
            }
        }

        int index = 0;
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            index = value.getListValue();
        }
        final View child = getChildAt(index);
        if (child == null) {
            Timber.w("RadioGroup.autoFill(): no child with index %s", index);
            return;
        }

        check(child.getId());
    }

    @Override
    public int getAutofillType() {
        return isEnabled() ? AUTOFILL_TYPE_LIST : AUTOFILL_TYPE_NONE;
    }

    @Override
    public AutofillValue getAutofillValue() {
        if (!isEnabled()) return null;

        final int count = getChildCount();
        for (int i = 0; i < count; i++) {
            final View child = getChildAt(i);
            if (child.getId() == mCheckedId) {
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                    return AutofillValue.forList(i);
                }
            }
        }
        return null;
    }
}