UiUtil.java

package com.cheng.utils;

import android.content.Context;
import android.text.TextUtils;
import android.util.DisplayMetrics;
import android.view.WindowManager;
import android.widget.Toast;

public class UiUtil {

    static private Toast mToast = null;

    static public int getScreenWidthPixels(Context context) {
        DisplayMetrics dm = new DisplayMetrics();
        ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay()
                .getMetrics(dm);
        return dm.widthPixels;
    }

    static public int dipToPx(Context context, int dip) {
        return (int) (dip * getScreenDensity(context) + 0.5f);
    }

    static public float getScreenDensity(Context context) {
        try {
            DisplayMetrics dm = new DisplayMetrics();
            ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay()
                    .getMetrics(dm);
            return dm.density;
        } catch (Exception e) {
            return DisplayMetrics.DENSITY_DEFAULT;
        }
    }

    public static void toast (Context context, String msg) {
        if(TextUtils.isEmpty(msg)) return;
        // 防止Toast重复显示
        if (mToast == null) {
            mToast = Toast.makeText(context.getApplicationContext(), msg, Toast.LENGTH_SHORT);
        } else {
            mToast.setText(msg);
            mToast.setDuration(Toast.LENGTH_SHORT);
        }
        mToast.show();
    }

}