DisplayUtil.java

package com.cheng.utils;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.inputmethod.InputMethodManager;

/**
 * 系统显示相关工具类
 */
public final class DisplayUtil {

    /**
     * Don't let anyone instantiate this class.
     */
    private DisplayUtil() {
        throw new Error("Do not need instantiate!");
    }

    /**
     * 根据手机的分辨率从 dp 的单位 转成为 px(像素)
     * @param context 上下文
     * @param dpValue 尺寸dip
     * @return 像素值
     */
    public static int dp2px(Context context, float dpValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);
    }

    /**
     * 根据手机的分辨率从 px(像素) 的单位 转成为 dp
     * @param context 上下文
     * @param pxValue 尺寸像素
     * @return DIP值
     */
    public static int px2dp(Context context, float pxValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (pxValue / scale + 0.5f);
    }

    /**
     * 根据手机的分辨率从 px(像素) 的单位 转成为 sp
     * @param context 上下文
     * @param pxValue 尺寸像素
     * @return SP值
     */
    public static int px2sp(Context context, float pxValue) {
        float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
        return (int) (pxValue / fontScale + 0.5f);
    }

    /**
     * 根据手机的分辨率从 sp 的单位 转成为 px
     * @param context 上下文
     * @param spValue SP值
     * @return 像素值
     */
    public static int sp2px(Context context, float spValue) {
        float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
        return (int) (spValue * fontScale + 0.5f);
    }

    /**
     * 获取dialog宽度
     *
     * @param activity Activity
     * @return Dialog宽度
     */
    public static int getDialogW(Activity activity) {
        DisplayMetrics dm = new DisplayMetrics();
        dm = activity.getResources().getDisplayMetrics();
        int w = dm.widthPixels - 100;
        // int w = aty.getWindowManager().getDefaultDisplay().getWidth() - 100;
        return w;
    }

    /**
     * 获取屏幕宽度
     *
     * @param activity Activity
     * @return 屏幕宽度
     */
    public static int getScreenW(Activity activity) {
        DisplayMetrics dm = new DisplayMetrics();
        dm = activity.getResources().getDisplayMetrics();
        int w = dm.widthPixels;
        // int w = aty.getWindowManager().getDefaultDisplay().getWidth();
        return w;
    }

    /**
     * 获取屏幕高度
     *
     * @param activity Activity
     * @return 屏幕高度
     */
    public static int getScreenH(Activity activity) {
        DisplayMetrics dm = new DisplayMetrics();
        dm = activity.getResources().getDisplayMetrics();
        int h = dm.heightPixels;
        // int h = aty.getWindowManager().getDefaultDisplay().getHeight();
        return h;
    }

    /**
     * Toggle keyboard If the keyboard is visible,then hidden it,if it's
     * invisible,then show it
     *
     * @param context 上下文
     */
    public static void toggleKeyboard(Context context) {
        InputMethodManager imm = (InputMethodManager) context
                .getSystemService(Context.INPUT_METHOD_SERVICE);
        if (imm.isActive()) {
            imm.toggleSoftInput(InputMethodManager.SHOW_IMPLICIT,
                    InputMethodManager.HIDE_NOT_ALWAYS);
        }
    }

    /**
     * 获得状态栏的高度
     *
     * @param context
     * @return
     */
    public static int getStatusHeight(Context context) {
        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) {
        View view = activity.getWindow().getDecorView();
        view.setDrawingCacheEnabled(true);
        view.buildDrawingCache();
        Bitmap bmp = view.getDrawingCache();
        int width = getScreenW(activity);
        int height = getScreenH(activity);
        Bitmap bp = null;
        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) {
        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 = getScreenW(activity);
        int height = getScreenH(activity);
        Bitmap bp = null;
        bp = Bitmap.createBitmap(bmp, 0, statusBarHeight, width, height
                - statusBarHeight);
        view.destroyDrawingCache();
        return bp;
    }

}