DrawerLayout设置滑动边距

////////////////////////2016/10/26/////////////////////

////////////////////////by    xbw////////////////////////

android.support.v4.widget.DrawerLayout制作的侧滑抽屉

 public static void setDrawerLeftEdgeSize(Activity activity, DrawerLayout drawerLayout, float displayWidthPercentage) {
        if (activity == null || drawerLayout == null) return;
        try {
            Field leftDraggerField = drawerLayout.getClass().getDeclaredField("mLeftDragger");
            leftDraggerField.setAccessible(true);
            ViewDragHelper leftDragger = (ViewDragHelper) leftDraggerField.get(drawerLayout);
            Field edgeSizeField = leftDragger.getClass().getDeclaredField("mEdgeSize");
            edgeSizeField.setAccessible(true);
            int edgeSize = edgeSizeField.getInt(leftDragger);
            DisplayMetrics dm = new DisplayMetrics();
            activity.getWindowManager().getDefaultDisplay().getMetrics(dm);
            edgeSizeField.setInt(leftDragger, Math.max(edgeSize, (int) (dm.widthPixels * displayWidthPercentage)));
        } catch (Exception e) {
        }
    }

private void initEvents() {
        mDrawerLayout.setDrawerListener(new DrawerLayout.DrawerListener() {
            @Override
            public void onDrawerStateChanged(int newState) {
            }

            @Override
            public void onDrawerSlide(View drawerView, float slideOffset) {
                View mContent = mDrawerLayout.getChildAt(0);
                View mMenu = drawerView;
                float scale = 1 - slideOffset;
                float rightScale = 0.8f + scale * 0.2f;
                if (drawerView.getTag().equals("LEFT")) {
                    float leftScale = 1 - 0.3f * scale;
                    ViewHelper.setScaleX(mMenu, leftScale);
                    ViewHelper.setScaleY(mMenu, leftScale);
                    ViewHelper.setAlpha(mMenu, 0.6f + 0.4f * (1 - scale));
                    ViewHelper.setTranslationX(mContent,
                            mMenu.getMeasuredWidth() * (1 - scale));
                    ViewHelper.setPivotX(mContent, 0);
                    ViewHelper.setPivotY(mContent,
                            mContent.getMeasuredHeight() / 2);
                    mContent.invalidate();
                    ViewHelper.setScaleX(mContent, rightScale);
                    ViewHelper.setScaleY(mContent, rightScale);

                } else {
                    ViewHelper.setTranslationX(mContent,
                            -mMenu.getMeasuredWidth() * slideOffset);
                    ViewHelper.setPivotX(mContent, mContent.getMeasuredWidth());
                    ViewHelper.setPivotY(mContent,
                            mContent.getMeasuredHeight() / 2);
                    mContent.invalidate();
                    ViewHelper.setScaleX(mContent, rightScale);
                    ViewHelper.setScaleY(mContent, rightScale);
                }
            }

            @Override
            public void onDrawerOpened(View drawerView) {
            }

            @Override
            public void onDrawerClosed(View drawerView) {
            }

        });
    }

mDrawerLayout = (DrawerLayout) findViewById(R.id.id_drawerLayout);
        //设置滑动边距
        setDrawerLeftEdgeSize(this, mDrawerLayout, 0.8f);