Android px转dip px转sp法则

在一些情况下，美工往往给我的都是px 这个时候我们就需要根据屏幕分辨率把px转成dip或者sp 下面就是计算公式：

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" 
    android:background="@android:color/white">


    <Button 
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:padding="20dp"
        android:text="开始"/>

</FrameLayout>

package com.example.test5;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Toast;
public class MainActivity extends Activity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.main);


        findViewById(R.id.button).setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                Test();

            }
        });

    }
    public boolean isGreaterThan(String time){
        String time1=time.replace(":", "").trim();
        String time2="0130";
        return Integer.parseInt(time2)-Integer.parseInt(time1)<=0;

    }


    private void Test() {
        final float fontScale = this.getResources().getDisplayMetrics().scaledDensity;  
        final float scale = this.getResources().getDisplayMetrics().density;
        int screenWidth  = getWindowManager().getDefaultDisplay().getWidth();       
        int screenHeight = getWindowManager().getDefaultDisplay().getHeight();  
        DisplayMetrics dm = new DisplayMetrics();  
        dm = new DisplayMetrics();  
        getWindowManager().getDefaultDisplay().getMetrics(dm);  
        float density  = dm.density;     
        float densityDPI = dm.densityDpi;  
        Log.d("text", "scale="+scale+"fontScale="+fontScale+"screenWidth="+screenWidth+"screenHeight="+screenHeight);
        Log.d("text", "density="+density+"densityDPI="+densityDPI);
         int a=px2sp(26,scale);


        String s1=px2dip(this,13)+"";
        String s6=px2dip(this,60)+"";
        String s7=px2dip(this,11)+"";
        String s8=px2dip(this,162)+"";
        String s9=px2dip(this,232)+"";
        String s10=px2dip(this,44)+"";
        String s11=px2dip(this,178)+"";
        String s12=px2dip(this,610)+"";
        String s13=px2dip(this,420)+"";
        String s14=px2dip(this,126)+"";

        String s2=px2dip(this,32)+"";
        String s3=px2sp(26, fontScale)+"";
        String s4=px2sp(22, fontScale)+"";
        String s5=px2sp(18, fontScale)+"";

        System.out.println("s1: "+s1+"-----"
                +"s6:"+s6+"-----"
                +"s7:"+s7+"-----"
                +"s8:"+s8+"-----"
                +"s9:"+s9+"-----"
                +"s10:"+s10+"-----"
                +"s11:"+s11+"-----"
                +"s12:"+s12+"-----"
                +"s13:"+s13+"-----"
                +"s14:"+s14+"-----"
        +"s2:"+s2+"-----"
        +"s3"+s3+"-----"
        +"s4"+s4+"-----"
        +"s5"+s5+"-----");

    }

    public static int dip2px(Context context, float dpValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);
    }

    public static int px2dip(Context context, float pxValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (pxValue / scale + 0.5f);
    }

    public static int px2sp(float pxValue, float fontScale) {
        return (int) (pxValue / fontScale + 0.5f);
    }

    public static int sp2px(float spValue, float fontScale) {
        return (int) (spValue * fontScale + 0.5f);
    }

    public void sT(String s){
        Toast.makeText(this, s, Toast.LENGTH_SHORT).show();
    }
}