ScreenUtils.java

package android.marshon.likequanmintv.librarys.utils.screen;


import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.marshon.likequanmintv.base.APP;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.WindowManager;



/**
 * Created by fulunyong on 2016/2/26 13:10
 *
 * @email fulunyong@126.com
 */
public class ScreenUtils {
    private ScreenUtils()
    {
		/* cannot be instantiated */
        throw new UnsupportedOperationException("cannot be instantiated");
    }

    /**
     * 获得屏幕高度
     * @param context
     * @return
     */
    public static int getScreenWidth(Context context)
    {
        if (null==context){
            context= APP.getContext();
        }
        WindowManager wm = (WindowManager) context
              .getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(outMetrics);
        return outMetrics.widthPixels;
    }

    /**
     * 获得屏幕宽度
     * @param context
     * @return
     */
    public static int getScreenHeight(Context context)
    {
        if (null==context){
            context= APP.getContext();
        }
        WindowManager wm = (WindowManager) context
              .getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(outMetrics);
        return outMetrics.heightPixels;
    }

    /**
     * 获得状态栏的高度
     * @param context
     * @return
     */
    public static int getStatusHeight(Context context)
    {
        if (null==context){
            context= APP.getContext();
        }
        int statusHeight = -1;
        try
        {
            Class<?> clazz = Class.forName("com.android.internal.R$dimen");
            Object object = clazz.newInstance();
            int height = Integer.parseInt(clazz.getField("status_bar_height")
                  .get(object).toString());
            statusHeight = context.getResources().getDimensionPixelSize(height);
        } catch (Exception e)
        {
            e.printStackTrace();
        }
        return statusHeight;
    }

    /**
     * 获取当前屏幕截图，包含状态栏
     * @param activity
     * @return
     */
    public static Bitmap snapShotWithStatusBar(Activity activity)
    {
        if (null==activity){
            return null;
        }
        View view = activity.getWindow().getDecorView();
        view.setDrawingCacheEnabled(true);
        view.buildDrawingCache();
        Bitmap bmp = view.getDrawingCache();
        int width = getScreenWidth(activity);
        int height = getScreenHeight(activity);
        Bitmap bp;
        bp = Bitmap.createBitmap(bmp, 0, 0, width, height);
        view.destroyDrawingCache();
        return bp;

    }

    /**
     * 获取当前屏幕截图，不包含状态栏
     * @param activity
     * @return
     */
    public static Bitmap snapShotWithoutStatusBar(Activity activity)
    {
        if (null==activity){
            return null;
        }
        View view = activity.getWindow().getDecorView();
        view.setDrawingCacheEnabled(true);
        view.buildDrawingCache();
        Bitmap bmp = view.getDrawingCache();
        Rect frame = new Rect();
        activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
        int statusBarHeight = frame.top;

        int width = getScreenWidth(activity);
        int height = getScreenHeight(activity);
        Bitmap bp = null;
        bp = Bitmap.createBitmap(bmp, 0, statusBarHeight, width, height
              - statusBarHeight);
        view.destroyDrawingCache();
        return bp;

    }



    /**
     * 将px值转换为sp值，保证文字大小不变
     * @param pxValue
     * @return
     */
    public static int px2sp(float pxValue) {
        final float fontScale = APP.getContext().getResources()
              .getDisplayMetrics().scaledDensity;
        return (int) (pxValue / fontScale + 0.5f);
    }

    /**
     * 将sp值转换为px值，保证文字大小不变
     * @return
     */
    public static int sp2px(float spValue) {
        final float fontScale = APP.getContext().getResources()
              .getDisplayMetrics().scaledDensity;
        return (int) (spValue * fontScale + 0.5f);
    }

    /**
     * 将px值转换为dip或dp值，保证尺寸大小不变
     *
     * @param pxValue
     * @return
     */
    public static int px2dp(float pxValue) {
        final float scale =APP.getContext().getResources().getDisplayMetrics().density;
        return (int) (pxValue / scale + 0.5f);
    }

    /**
     * 将dip或dp值转换为px值，保证尺寸大小不变
     *
     * @param dipValue
     * @return
     */
    public static int dp2px(float dipValue) {
        final float scale =APP.getContext().getResources().getDisplayMetrics().density;
        return (int) (dipValue * scale + 0.5f);
    }


}