import android.support.v7.widget.ViewUtils; //导入依赖的package包/类
private void switchFragment(Class<?> clazz) {
    Fragment to = ViewUtils.createFragment(clazz);
    if (to.isAdded()) {
        Log.i(TAG, "Added");
        mFragmentManager.beginTransaction().hide(mCurrentFragment).show(to).commitAllowingStateLoss();
    } else {
        Log.i(TAG, "Not Added");
        mFragmentManager.beginTransaction().hide(mCurrentFragment).add(R.id.frame_content, to).commitAllowingStateLoss();
    }
    mCurrentFragment = to;
}
 

import android.support.v7.widget.ViewUtils; //导入依赖的package包/类
private void initDefaultFragment() {
        Log.i(TAG, "initDefaultFragment");
        mCurrentFragment = ViewUtils.createFragment(MainFragment.class);

        mFragmentManager.beginTransaction().add(R.id.frame_content, mCurrentFragment).commit();
        mNavigationView.getMenu().getItem(mCurrentSelectMenuIndex).setChecked(true);
//
//        Log.i(TAG, "mNavigationView.getMenu().getItem(0)" + mNavigationView.getMenu().getItem(0).isChecked());
//        Log.i(TAG, "mNavigationView.getMenu().getItem(1)" + mNavigationView.getMenu().getItem(1).isChecked());
    }
 

import android.support.v7.widget.ViewUtils; //导入依赖的package包/类
private int updateStatusGuard(int insetTop) {
    int i = 0;
    boolean showStatusGuard = false;
    if (this.mActionModeView != null && (this.mActionModeView.getLayoutParams() instanceof MarginLayoutParams)) {
        MarginLayoutParams mlp = (MarginLayoutParams) this.mActionModeView.getLayoutParams();
        boolean mlpChanged = false;
        if (this.mActionModeView.isShown()) {
            int newMargin;
            if (this.mTempRect1 == null) {
                this.mTempRect1 = new Rect();
                this.mTempRect2 = new Rect();
            }
            Rect insets = this.mTempRect1;
            Rect localInsets = this.mTempRect2;
            insets.set(0, insetTop, 0, 0);
            ViewUtils.computeFitSystemWindows(this.mSubDecor, insets, localInsets);
            if (localInsets.top == 0) {
                newMargin = insetTop;
            } else {
                newMargin = 0;
            }
            if (mlp.topMargin != newMargin) {
                mlpChanged = true;
                mlp.topMargin = insetTop;
                if (this.mStatusGuard == null) {
                    this.mStatusGuard = new View(this.mContext);
                    this.mStatusGuard.setBackgroundColor(this.mContext.getResources().getColor(R.color.abc_input_method_navigation_guard));
                    this.mSubDecor.addView(this.mStatusGuard, -1, new LayoutParams(-1, insetTop));
                } else {
                    LayoutParams lp = this.mStatusGuard.getLayoutParams();
                    if (lp.height != insetTop) {
                        lp.height = insetTop;
                        this.mStatusGuard.setLayoutParams(lp);
                    }
                }
            }
            if (this.mStatusGuard != null) {
                showStatusGuard = true;
            } else {
                showStatusGuard = false;
            }
            if (!this.mOverlayActionMode && showStatusGuard) {
                insetTop = 0;
            }
        } else if (mlp.topMargin != 0) {
            mlpChanged = true;
            mlp.topMargin = 0;
        }
        if (mlpChanged) {
            this.mActionModeView.setLayoutParams(mlp);
        }
    }
    if (this.mStatusGuard != null) {
        View view = this.mStatusGuard;
        if (!showStatusGuard) {
            i = 8;
        }
        view.setVisibility(i);
    }
    return insetTop;
}
 

import android.support.v7.widget.ViewUtils; //导入依赖的package包/类
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
    final int paddingLeft = getPaddingLeft();
    final int paddingRight = getPaddingRight();
    final int paddingTop = getPaddingTop();
    final int paddingBottom = getPaddingBottom();

    final boolean isRTL = ViewUtils.isLayoutRtl(this);
    final int columnWidth =
            Math.round((float) (right - left - paddingLeft - paddingRight)) / mColumnCount;
    final int rowHeight =
            Math.round((float) (bottom - top - paddingTop - paddingBottom)) / mRowCount;

    int rowIndex = 0, columnIndex = 0;
    for (int childIndex = 0; childIndex < getChildCount(); ++childIndex) {
        final View childView = getChildAt(childIndex);
        if (childView.getVisibility() == View.GONE) {
            continue;
        }

        final MarginLayoutParams lp = (MarginLayoutParams) childView.getLayoutParams();

        final int childTop = paddingTop + lp.topMargin + rowIndex * rowHeight;
        final int childBottom = childTop - lp.topMargin - lp.bottomMargin + rowHeight;
        final int childLeft = paddingLeft + lp.leftMargin +
                (isRTL ? (mColumnCount - 1) - columnIndex : columnIndex) * columnWidth;
        final int childRight = childLeft - lp.leftMargin - lp.rightMargin + columnWidth;

        final int childWidth = childRight - childLeft;
        final int childHeight = childBottom - childTop;
        if (childWidth != childView.getMeasuredWidth() ||
                childHeight != childView.getMeasuredHeight()) {
            childView.measure(
                    MeasureSpec.makeMeasureSpec(childWidth, MeasureSpec.EXACTLY),
                    MeasureSpec.makeMeasureSpec(childHeight, MeasureSpec.EXACTLY));
        }
        childView.layout(childLeft, childTop, childRight, childBottom);

        rowIndex = (rowIndex + (columnIndex + 1) / mColumnCount) % mRowCount;
        columnIndex = (columnIndex + 1) % mColumnCount;
    }
}
 

import android.support.v7.widget.ViewUtils; //导入依赖的package包/类
private boolean isLayoutRtl() {
  return ViewUtils.isLayoutRtl(this);
}
 

import android.support.v7.widget.ViewUtils; //导入依赖的package包/类
/**
 * Animated the forward movement of the cursor.
 * <p>
 * Only available of JellyBean and above devices.
 * Does not work with RTL languages.
 *
 * @param animated Animate the cursors movement.
 */
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public void setCursorAnimated(boolean animated) {
    mAnimateCursor = animated && Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN && !ViewUtils.isLayoutRtl(this);

}