安卓常用工具类-ControlsUtils【设备、尺寸相关的工具类】

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package com.example.burro.demo.appframework.util;import android.app.Activity;import android.util.DisplayMetrics;import android.view.View;/**设备，dp-px转换类 * Created by burro on 17-2-23. */public class ControlsUtils {    private static DisplayMetrics _dm = null;    private static DisplayMetrics getDm(Activity activity) {        if (_dm == null) {            _dm = new DisplayMetrics();            activity .getWindowManager().getDefaultDisplay().getMetrics(_dm);        }        return _dm;    }    public static float getDensity(Activity activity) {        return  getDm(activity).density;    }    public static int getScreenWidthPx(Activity activity) {        return getDm(activity).widthPixels;    }    public static int getScreenHeightPx(Activity activity) {        return getDm(activity).heightPixels;    }    public static int getScreenWidthDp(Activity activity) {        return px2Dp(activity, getDm(activity).widthPixels);    }    public static int getScreenHeightDp(Activity activity) {        return px2Dp(activity, getDm(activity).heightPixels);    }    public static int px2Dp(Activity activity, int pxValue) {        final float scale = getDm(activity).density;        return (int) (pxValue / scale + 0.5f);    }    public static int dp2Px(Activity activity, int dpValue) {        final float scale = getDm(activity).density;        return (int) (dpValue * scale + 0.5f);    }    public static int getViewHeight(final View view) {        int _height = -1;        int h = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);        int w = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);        view.measure(w, h);        _height = view.getMeasuredHeight();        return _height;    }    public static int getViewWidth(final View view) {        int _width = -1;        int h = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);        int w = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);        view.measure(w, h);        _width = view.getMeasuredWidth();        return _width;    }}
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