android 应用在启动后进行全局的的初始化操作

package com.wzh.app;

import com.wzh.volley.WzhVolley;
import android.app.Application;
import android.util.Log;

public class WzhShshtApp extends Application{
    @Override
    public void onCreate() {
        super.onCreate();
        Log.i("+++++++++++","*******");
        init();
    }

    
    private void init() {
        WzhVolley.init(this);
    }
}

<application
        android:name="com.wzh.app.WzhShshtApp"
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@android:style/Theme.Holo.Light" >