自定义控件：自定义RadioGroup和RadioButton，让布局有更多选择

转载请注明出处：http://blog.csdn.net/wriar/article/details/79004334

android的系统控件RadioGroup布局继承的是LinearLayout，所以只能实现这样单行或者单列的

也很容易实现

但是有时候会是这种多行多列布局

遇到这种情况RadioGroup就没用了。

况且单个选项的布局有可能会很复杂，RadioButton内又不能设置复杂布局

为了解决这个问题我写了一套自定义的RadioGroup和RadioButton，RadioGroup继承了GridLayout，已适配更复杂的布局情况，RadioButton继承了FrameLayout，里面的布局随便写

看效果图，动图我就不折腾了

贴代码：

/**
 * 说明
 * 

 * android:columnCount="3"  几列
 * android:rowCount="3"     几行
 * android:checkedButton="@+id/mrb1"  选中哪个
 */

/**
 * @author hp
 * @ClassName MRadioGroup
 * @Description: android:checkedButton="@+id/mrb1"
 * @date 2018/1/5 0005
 */
public class MRadioGroup extends GridLayout {
    // holds the checked id; the selection is empty by default
    private int mCheckedId = -1;
    private boolean mProtectFromCheckedChange = false;
    private OnCheckedChangeListener mOnCheckedChangeListener;

    private MRadioButton.OnCheckedChangeListener mChildOnCheckedChangeListener;
    private PassThroughHierarchyChangeListener mPassThroughListener;

    public MRadioGroup(Context context) {
        super(context);
        init();
    }

    public MRadioGroup(Context context, AttributeSet attrs) {
        super(context, attrs);
        // retrieve selected radio button as requested by the user in the
        // XML layout file
        TypedArray attributes = context.obtainStyledAttributes(
                attrs, getInternalRS("styleable", "RadioGroup"), getInternalR("attr", "radioButtonStyle"), 0);

        int value = attributes.getResourceId(getInternalR("styleable", "RadioGroup_checkedButton"), View.NO_ID);
        if (value != View.NO_ID) {
            mCheckedId = value;
            Log.e("MINE", "setChecked mCheckedId:" + mCheckedId);
        }
        attributes.recycle();
        init();
    }

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

    /**
     * 
Register a callback to be invoked when the checked radio button
     * changes in this group.
     *
     * @param listener the callback to call on checked state change
     */
    public void setOnCheckedChangeListener(OnCheckedChangeListener listener) {
        mOnCheckedChangeListener = listener;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) {
        // the user listener is delegated to our pass-through listener
        mPassThroughListener.mOnHierarchyChangeListener = listener;
    }

    /**
     * 
Interface definition for a callback to be invoked when the checked
     * radio button changed in this group.
     */
    public interface OnCheckedChangeListener {
        /**
         * 
Called when the checked radio button has changed. When the
         * selection is cleared, checkedId is -1.
         *
         * @param group     the group in which the checked radio button has changed
         * @param checkedId the unique identifier of the newly checked radio button
         */
        public void onCheckedChanged(View group, @IdRes int checkedId);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();

        // checks the appropriate radio button as requested in the XML file
        if (mCheckedId != -1) {
            mProtectFromCheckedChange = true;
            setCheckedStateForView(mCheckedId, true);
            mProtectFromCheckedChange = false;
            setCheckedId(mCheckedId);
        }
    }

    private class CheckedStateTracker implements MRadioButton.OnCheckedChangeListener {

        @Override
        public void onCheckedChanged(View buttonView, boolean isChecked) {
            // prevents from infinite recursion
            if (mProtectFromCheckedChange) {
                return;
            }

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

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

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

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

    /**
     * 
Sets the selection to the radio button whose identifier is passed in
     * parameter. Using -1 as the selection identifier clears the selection;
     * such an operation is equivalent to invoking {@link #clearCheck()}.
     *
     * @param id the unique id of the radio button to select in this group
     * @see #getCheckedRadioButtonId()
     * @see #clearCheck()
     */
    public void check(@IdRes int id) {
        // don't even bother
        if (id != -1 && (id == mCheckedId)) {
            return;
        }

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

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

        setCheckedId(id);
    }

    private void setCheckedId(@IdRes int id) {
        mCheckedId = id;
        if (mOnCheckedChangeListener != null) {
            mOnCheckedChangeListener.onCheckedChanged(this, mCheckedId);
        }
    }

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

    /**
     * 
Returns the identifier of the selected radio button in this group.
     * Upon empty selection, the returned value is -1.
     *
     * @return the unique id of the selected radio button in this group
     * @attr ref android.R.styleable#RadioGroup_checkedButton
     * @see #check(int)
     * @see #clearCheck()
     */
    @IdRes
    public int getCheckedRadioButtonId() {
        return mCheckedId;
    }

    /**
     * 
Clears the selection. When the selection is cleared, no radio button
     * in this group is selected and {@link #getCheckedRadioButtonId()} returns
     * null.
     *
     * @see #check(int)
     * @see #getCheckedRadioButtonId()
     */
    public void clearCheck() {
        check(-1);
    }

    /**
     * 
A pass-through listener acts upon the events and dispatches them
     * to another listener. This allows the table layout to set its own internal
     * hierarchy change listener without preventing the user to setup his.
     */
    private class PassThroughHierarchyChangeListener implements
            ViewGroup.OnHierarchyChangeListener {
        private ViewGroup.OnHierarchyChangeListener mOnHierarchyChangeListener;

        /**
         * {@inheritDoc}
         */
        @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR1)
        public void onChildViewAdded(View parent, View child) {
            if (parent == MRadioGroup.this && child instanceof MRadioButton) {
                int id = child.getId();
                // generates an id if it's missing
                if (id == View.NO_ID) {
                    id = View.generateViewId();
                    child.setId(id);
                }
                ((MRadioButton) child).setOnCheckedChangeWidgetListener(
                        mChildOnCheckedChangeListener);
            }

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

        /**
         * {@inheritDoc}
         */
        public void onChildViewRemoved(View parent, View child) {
            if (parent == MRadioGroup.this && child instanceof MRadioButton) {
                ((MRadioButton) child).setOnCheckedChangeWidgetListener(null);
            }
            if (mOnHierarchyChangeListener != null) {
                mOnHierarchyChangeListener.onChildViewRemoved(parent, child);
            }
        }
    }

    public int getInternalR(String v1, String v2) {
        int titleStyle = 0;
        try {
            Class clasz = Class.forName("com.android.internal.R$" + v1);//styleable
            Field field = clasz.getDeclaredField(v2);
            field.setAccessible(true);
            titleStyle = (Integer) field.get(null);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        }
        Log.w("MINE", "getInternalR:" + titleStyle);
        return titleStyle;
    }

    public int[] getInternalRS(String v1, String v2) {
        int[] textAppearanceStyleArr = new int[0];
        try {
            Class clasz = Class.forName("com.android.internal.R$" + v1);//styleable
            Field field = clasz.getDeclaredField(v2);
            field.setAccessible(true);
            textAppearanceStyleArr = (int[]) field.get(null);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        }
        Log.w("MINE", "getInternalRS:" + textAppearanceStyleArr);
        return textAppearanceStyleArr;
    }
}

/**
 * 说明
 * 

 * android:layout_column="1" 第几行
 * android:layout_row="0"    第几列
 * android:checked="true"    是否选中
 *
 * 图片资源里面设置的是state_selected属性不是state_checked
 */

/**
 * @author hp
 * @ClassName MRadioButton
 * @Description:
 * @date 2018/1/5 0005
 */
public class MRadioButton extends FrameLayout implements Checkable {
    private boolean mChecked;
    private OnCheckedChangeListener mOnCheckedChangeListener;
    private OnCheckedChangeListener mOnCheckedChangeWidgetListener;

    public MRadioButton(Context context) {
        this(context, null);
    }

    public MRadioButton(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public MRadioButton(Context context, AttributeSet attrs, int defStyleAttr) {
        this(context, attrs, defStyleAttr, 0);
    }

    public MRadioButton(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr);
        defStyleAttr = getInternalR("attr", "radioButtonStyle");
        final TypedArray a = context.obtainStyledAttributes(
                attrs, getInternalRS("styleable", "CompoundButton"), defStyleAttr, defStyleRes);
        if (a.hasValue(getInternalR("styleable", "CompoundButton_checked"))) {
            final boolean checked = a.getBoolean(getInternalR("styleable", "CompoundButton_checked"), false);
            setChecked(checked);
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        Log.w("MINE", "MotionEvent:" + event);
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                performClick();
                break;
        }
        return super.onTouchEvent(event);
    }

    /**
     * Register a callback to be invoked when the checked state of this button
     * changes.
     *
     * @param listener the callback to call on checked state change
     */
    public void setOnCheckedChangeListener(OnCheckedChangeListener listener) {
        mOnCheckedChangeListener = listener;
    }

    /**
     * Register a callback to be invoked when the checked state of this button
     * changes. This callback is used for internal purpose only.
     *
     * @param listener the callback to call on checked state change
     * @hide
     */
    void setOnCheckedChangeWidgetListener(OnCheckedChangeListener listener) {
        mOnCheckedChangeWidgetListener = listener;
    }

    @Override
    public void setChecked(boolean checked) {
        Log.e("MINE", "setChecked:" + checked);
        if (mChecked != checked) {
            mChecked = checked;
            setSelected(checked);
            refreshDrawableState();
            if (mOnCheckedChangeListener != null) {
                mOnCheckedChangeListener.onCheckedChanged(this, mChecked);
            }
            if (mOnCheckedChangeWidgetListener != null) {
                mOnCheckedChangeWidgetListener.onCheckedChanged(this, mChecked);
            }
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        setSelected(mChecked);
    }

    @Override
    public void setSelected(boolean selected) {
        super.setSelected(selected);
        for (int i = 0; i < getChildCount(); i++) {
            View v = getChildAt(i);
            v.setSelected(selected);
        }
    }

    public int getInternalR(String v1, String v2) {
        int titleStyle = 0;
        try {
            Class clasz = Class.forName("com.android.internal.R$" + v1);//styleable
            Field field = clasz.getDeclaredField(v2);
            field.setAccessible(true);
            titleStyle = (Integer) field.get(null);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        }
        Log.w("MINE", "getInternalR:" + titleStyle);
        return titleStyle;
    }

    public int[] getInternalRS(String v1, String v2) {
        int[] textAppearanceStyleArr = new int[0];
        try {
            Class clasz = Class.forName("com.android.internal.R$" + v1);//styleable
            Field field = clasz.getDeclaredField(v2);
            field.setAccessible(true);
            textAppearanceStyleArr = (int[]) field.get(null);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        }
        Log.w("MINE", "getInternalRS:" + textAppearanceStyleArr);
        return textAppearanceStyleArr;
    }

    /**
     * Interface definition for a callback to be invoked when the checked state
     * of a compound button changed.
     */
    public static interface OnCheckedChangeListener {
        /**
         * Called when the checked state of a compound button has changed.
         *
         * @param buttonView The compound button view whose state has changed.
         * @param isChecked  The new checked state of buttonView.
         */
        void onCheckedChanged(View buttonView, boolean isChecked);
    }

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

    @Override
    public boolean performClick() {
        toggle();

        final boolean handled = super.performClick();
        if (!handled) {
            // View only makes a sound effect if the onClickListener was
            // called, so we'll need to make one here instead.
            playSoundEffect(SoundEffectConstants.CLICK);
        }

        return handled;
    }

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