鸿洋AutoLayout代码分析（三）：入口类分析

public class AutoLayoutActivity extends FragmentActivity {
    private static final String LAYOUT_LINEARLAYOUT = "LinearLayout";
    private static final String LAYOUT_FRAMELAYOUT = "FrameLayout";
    private static final String LAYOUT_RELATIVELAYOUT = "RelativeLayout";


    @Override
    public View onCreateView(String name, Context context, AttributeSet attrs) {
        View view = null;
        if (name.equals(LAYOUT_FRAMELAYOUT)) {
            view = new AutoFrameLayout(context, attrs);
        }

        if (name.equals(LAYOUT_LINEARLAYOUT)) {
            view = new AutoLinearLayout(context, attrs);
        }

        if (name.equals(LAYOUT_RELATIVELAYOUT)) {
            view = new AutoRelativeLayout(context, attrs);
        }

        if (view != null) return view;

        return super.onCreateView(name, context, attrs);
    }
}

LinearLayout -> AutoLinearLayout
RelativeLayout -> AutoRelativeLayout
FrameLayout -> AutoFrameLayout

public class AutoLinearLayout extends LinearLayout {

    private AutoLayoutHelper mHelper = new AutoLayoutHelper(this);

    public AutoLinearLayout(Context context) {
        super(context);
    }

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

    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    public AutoLinearLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public AutoLinearLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        if (!isInEditMode())
            mHelper.adjustChildren();
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }


    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
    }


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


    public static class LayoutParams extends LinearLayout.LayoutParams
            implements AutoLayoutHelper.AutoLayoutParams {
        private AutoLayoutInfo mAutoLayoutInfo;

        public LayoutParams(Context c, AttributeSet attrs) {
            super(c, attrs);
            mAutoLayoutInfo = AutoLayoutHelper.getAutoLayoutInfo(c, attrs);
        }

        @Override
        public AutoLayoutInfo getAutoLayoutInfo() {
            return mAutoLayoutInfo;
        }


        public LayoutParams(int width, int height) {
            super(width, height);
        }


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

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

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

public static class LayoutParams extends ViewGroup.MarginLayoutParams {
        /**
         * Indicates how much of the extra space in the LinearLayout will be
         * allocated to the view associated with these LayoutParams. Specify
         * 0 if the view should not be stretched. Otherwise the extra pixels
         * will be pro-rated among all views whose weight is greater than 0.
         */
        @ViewDebug.ExportedProperty(category = "layout")
        public float weight;

        /**
         * Gravity for the view associated with these LayoutParams.
         *
         * @see android.view.Gravity
         */
        @ViewDebug.ExportedProperty(category = "layout", mapping = {
            @ViewDebug.IntToString(from =  -1,                       to = "NONE"),
            @ViewDebug.IntToString(from = Gravity.NO_GRAVITY,        to = "NONE"),
            @ViewDebug.IntToString(from = Gravity.TOP,               to = "TOP"),
            @ViewDebug.IntToString(from = Gravity.BOTTOM,            to = "BOTTOM"),
            @ViewDebug.IntToString(from = Gravity.LEFT,              to = "LEFT"),
            @ViewDebug.IntToString(from = Gravity.RIGHT,             to = "RIGHT"),
            @ViewDebug.IntToString(from = Gravity.START,            to = "START"),
            @ViewDebug.IntToString(from = Gravity.END,             to = "END"),
            @ViewDebug.IntToString(from = Gravity.CENTER_VERTICAL,   to = "CENTER_VERTICAL"),
            @ViewDebug.IntToString(from = Gravity.FILL_VERTICAL,     to = "FILL_VERTICAL"),
            @ViewDebug.IntToString(from = Gravity.CENTER_HORIZONTAL, to = "CENTER_HORIZONTAL"),
            @ViewDebug.IntToString(from = Gravity.FILL_HORIZONTAL,   to = "FILL_HORIZONTAL"),
            @ViewDebug.IntToString(from = Gravity.CENTER,            to = "CENTER"),
            @ViewDebug.IntToString(from = Gravity.FILL,              to = "FILL")
        })
        public int gravity = -1;

        /**
         * {@inheritDoc}
         */
        public LayoutParams(Context c, AttributeSet attrs) {
            super(c, attrs);
            TypedArray a =
                    c.obtainStyledAttributes(attrs, com.android.internal.R.styleable.LinearLayout_Layout);

            weight = a.getFloat(com.android.internal.R.styleable.LinearLayout_Layout_layout_weight, 0);
            gravity = a.getInt(com.android.internal.R.styleable.LinearLayout_Layout_layout_gravity, -1);

            a.recycle();
        }

        /**
         * {@inheritDoc}
         */
        public LayoutParams(int width, int height) {
            super(width, height);
            weight = 0;
        }

        /**
         * Creates a new set of layout parameters with the specified width, height
         * and weight.
         *
         * @param width the width, either {@link #MATCH_PARENT},
         *        {@link #WRAP_CONTENT} or a fixed size in pixels
         * @param height the height, either {@link #MATCH_PARENT},
         *        {@link #WRAP_CONTENT} or a fixed size in pixels
         * @param weight the weight
         */
        public LayoutParams(int width, int height, float weight) {
            super(width, height);
            this.weight = weight;
        }

        /**
         * {@inheritDoc}
         */
        public LayoutParams(ViewGroup.LayoutParams p) {
            super(p);
        }

        /**
         * {@inheritDoc}
         */
        public LayoutParams(ViewGroup.MarginLayoutParams source) {
            super(source);
        }

        /**
         * Copy constructor. Clones the width, height, margin values, weight,
         * and gravity of the source.
         *
         * @param source The layout params to copy from.
         */
        public LayoutParams(LayoutParams source) {
            super(source);

            this.weight = source.weight;
            this.gravity = source.gravity;
        }

        @Override
        public String debug(String output) {
            return output + "LinearLayout.LayoutParams={width=" + sizeToString(width) +
                    ", height=" + sizeToString(height) + " weight=" + weight +  "}";
        }

        /** @hide */
        @Override
        protected void encodeProperties(@NonNull ViewHierarchyEncoder encoder) {
            super.encodeProperties(encoder);

            encoder.addProperty("layout:weight", weight);
            encoder.addProperty("layout:gravity", gravity);
        }
    }

public static class LayoutParams extends LinearLayout.LayoutParams
            implements AutoLayoutHelper.AutoLayoutParams
    {
        private AutoLayoutInfo mAutoLayoutInfo;

        public LayoutParams(Context c, AttributeSet attrs)
        {
            super(c, attrs);
            mAutoLayoutInfo = AutoLayoutHelper.getAutoLayoutInfo(c, attrs);
        }

        @Override
        public AutoLayoutInfo getAutoLayoutInfo()
        {
            return mAutoLayoutInfo;
        }


        public LayoutParams(int width, int height)
        {
            super(width, height);
        }


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

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

    }

public class AutoLayoutInfo {
    private List<AutoAttr> autoAttrs = new ArrayList<>();

    public void addAttr(AutoAttr autoAttr) {
        autoAttrs.add(autoAttr);
    }


    public void fillAttrs(View view) {
        for (AutoAttr autoAttr : autoAttrs) {
            autoAttr.apply(view);
        }
    }

    @Override
    public String toString() {
        return "AutoLayoutInfo{" +
                "autoAttrs=" + autoAttrs +
                '}';
    }
}